Amazing flag to flag coverage as always. Better than the NBC broadcast. (The IMSA broadcasters actually understand what's going on) Thanks for the upload!
Love this track, first time I seen the track the Vipers and a couple of other cars were doing wheelies through those awesome esses. Love the grass on the outside of the track it self penalises cars. We need that here around Aussie tracks. Love GT racing
Once again, thank you IMSA Official for the timely uploading of the races. It makes it so much easier to keep up with the WeatherTech Championship for fans (like myself) who might not get to see the races live without just getting the results from the official website.
Congratulations to the Porsche champions for 2019. I'm loving the sound of a screaming banshee 252 cu. in. n.a. flat 6 at 9500 RPM. They smoked all larger and boosted engines- that's always the Porsche mantra and the legend continues.
Been waitin for this one. Thanks for sharing. My favorite racing series. Hope more manufacturers field teams for 2020. A GTD Nissan GTR team would be neat.
Thanks for uploading the race, but can you please do something about the awful BoP in GTLM? Porsche has had the best car for every race, except Road America and Sebring, yet they have never gotten hit by BoP while every other GTLM car has been slowed instead.
Can you better explain this to me? I don't quite understand. I did some quick research and it looks like Porsche did get hit by BoP but for increased fuel capacity? Just curious if they have some unfair advantage now or something like that.
@@christopherkhan3032 Porsche got a BoP adjustment in the beginning of the season to weigh 20kg less than the car (that won Petit Le Mans in 2018). Ever since than, they have had the fastest car at every track except Road America and Sebring. Despite this, they have not been adjusted once this season, whereas Ford, Chevrolet, and BMW have all had very poor adjustments favoring Porsche even more. BMW has no power, the Ford GT is way to heavy, it is by far the heaviest car in GTLM, and the Corvette gained an extra 10kg after the Glen, which seems to make it slower, but also makes it heavier than the Porsche for the first time. Porsche has the benefits of being a light car (1245kg) AND having more power via their better restrictor in the engine. And the result of that is having the most potent car not because of teamwork, but simply down to the very questionable decisions made by those who give out the BoP. Yes you are correct, BoP adjusted Porsche's fuel number, but this doesn't affect laptime performance.
Thank you for the reply and education! I know there is potential for me to get ripped on here (and that is perfectly fine by me), but I really do hate Porsches. Always been a Chevy and Mopar guy so knowing this definitely doesn't help my already negative feelings towards them. : )
@@joshmiller804 Is it worth mentioning as well that those increases in weight also effect the tyre wear on the cars which limits the amount and how long a car can push on in a stint even after the fuel wears off
My son and I were at this race and always watch the races on the IMSA channel. My son really wanted to meet John and Jeremy but guessing they never left the IMSA broadcast booth by the bridge. They need to get out and about more when time allows!
Not the closest IMSA race but was still enjoyable. The yellows were a bit ridiculous frankly. It was a quicker yellow to recover a damaged car, repair the tyre barrier and take a driver and a photographer to the medical centre than it was to simply pick up a tyre carcass. The whole safety car/yellow system needs a rethink imo. Creventic seem to manage ok without safety cars. But thanks for uploading and thanks to IMSA radio for the great commentary once again.
IMSA again making sure Porsche wins. This is almost like professional wrestling at this point. IMSA just decides who they want to win and adds weight to all of the other cars until they are no longer competitive. BoP sure is fun stuff!
I won't say that they are making sure Porsche wins, but after so many dominating wins (6 from 9 so far this year in IMSA) you'd think there would be a BOP adjustment against them. Yet there hasn't been.
@@Holden308 yeah, it is just disappointing that the argument could be made that IMSA plays favorites. BMW has been way off all year, Corvette has not won a race in two years, and they are either penalized for being competitive or left at the back to try and stay ahead of GTD cars. While that's happening, Porsche is getting 30 seconds to a minute ahead of all of the other cars and winning race after race with no "balancing" after (unless there is a flag to bring the field closer or they screw up their strategy and beat themselves like at Lime Rock). Even in the last 9 minutes of this race, the shower of the two Porsches pulled out a 2 second lead on the Vette in 3rd. That's like 5 laps to get 2 seconds on the field, that sucks as a fan to watch.
@@FredB2332 it just amazes me that Porsche haven't had a BOP adjustment all year despite 6 wins from 9 races, yet others get adjusted whenever they show a bit of speed. The Corvette's for example got an added 10 kg after Watkins Glen (despite not winning, no prizes for guessing who did) and they went from actually being the fastest there to being the slowest and barely faster than GTD at Mosport. All the while the Porsche's keep dominating the field with the same BOP spec that they showed up with at Daytona.
@@Holden308 I agree 100%, which is why it feels like IMSA wants Porsche to win. Now that they have died up the manufacturer's championship I wouldn't be surprised to see IMSA slap a 5kg penalty on them for appearance sake, but the damage is done. It's why Risi Ferrari left. They were sick of the BoP crap. You really didn't have this when the series was the ALMS. Some cars for better at certain courses (which is fine, they have different layouts) but all manufacturers were competitive in the GT field. Now prototypes were another thing, but the GT racing was so much better before IMSA.
When GTLM had a good field even though Ferrari and Aston Martin didn’t join in as they do for GTE. Hopefully it can comback again soon with a bunch of great manufacturers and good racing!!!!
The GTLM class has gone away in WeatherTech Championship competition and in 2022 have moved to the GTD PRO class. Currently for the Roar there are 13 entries including Aston Martin, BMW, Corvette, Ferrari, Lamborghini, Lexus and Mercedes-AMG.
Technical question from a private pilot: I'm confused. To a pilot, full-rich doesn't mean full-power, or unrestricted fuel flow. It means a fuel/air mixture that has more fuel than can be burned by the air it's mixed with. That's what full-rich means in a carbureted, normally-aspirated piston aircraft engine anyway. It means you're guaranteed enough fuel flow to keep the engine running, though some of it isn't burned. It's really overkill - something you do when you don't want to be bothered with tweaking the optimal mixture, like when you're landing or dealing with an emergency, but it gives you no extra power. It reduces power a very small amount. Is it different somehow in race cars? (There is a LOT I don't know about race cars. I'm fairly new as a fan.) Can they handle the extra heat from running lean, and is there some reason that a lean mixture is the preferred way to save fuel? Wouldn't it make more sense to let the computer determine the optimal mixture and then limit fuel consumption with throttle limits? Thanks!
They use "full rich" colloquially. The GTLM/GTE cars have engine map settings that can be changed by the driver. (I think GTD/GT3 as well but I'm not positive.) They'll have a bunch of pre-set maps on a dial on their steering wheel that change all all sorts of ECU settings. They say full rich to describe the driver putting the car into the mode that delivers the most power possible. Here's a video about torque mapping ruclips.net/video/1cr4uIzkD0k/видео.html It's about f1 but the basic theory applies still. There's also a cool video of Ollie Gaving giving a tour of the Corvette C7R cockpit that'll give you an idea of what sort of extra bells and whistles the driver has available to them.
@@argyleisgreat Thanks! I do like Chain Bear's videos. He's great at explaining things to guys like me who can generally understand things that are more technical but lack the basic knowledge. I have always wondered what map settings were too! When I heard terms like engine map and full rich, I thought of the only thing I understood - aircraft piston engines. In an aircraft engine, MAP means manifold pressure. (I think that's also true in cars, right? Just not in this context?) In high performance piston aircraft, you set the engine at its most efficient RPM, and when you increase the throttle, the propeller blades pitch more steeply in order to maintain that RPM. That translates to more thrust and more resistance to the engine's torque. But in order to know how hard the engine is working (since RPM measurement is meaningless in this setup), exhaust manifold pressure is used as a surrogate measure. I don't know if you have the slightest interest in aircraft engines, but you've helped me understand racing engines, and I'm grateful. :-)
@@beenaplumber8379 Yes, MAP still refers to manifold pressure, but in this context they call it a map because the computer has "lookup tables" for the important parameters it's controlling. They use manifold pressure, intake temperature, and RPM to decide things like spark timing and fuel mixture by adjusting the length of time the fuel injectors are open. When the drivers turn the knob, they're changing the whole calibration and potentially behavior of the engine. As for running lean - that only increases temperature to a point. As you go further lean, the temps come back down because the reduced amount of fuel just doesn't have the same energy. I'm sure you've heard of Lean Of Peak running in small airplanes - you just need to watch your exhaust gas temps when you do it. These race car engines (as well as pretty much 100% of cars made since the 90's or so) also have knock sensors that will react to the onset of detonation by adjusting spark timing or fuel delivery to keep the engine safe - that's what the full rich setting in a light airplane is for: knock resistance at full power.
@@Avilator189 Wow, you're challenging my memory! Yeah, I learned about detonation and pre-ignition. Running an air-cooled aircraft engine at full-rich cools it down, which is an important part of preventing the knocking. But while leaning the engine with a constant throttle setting and constant altitude, the RPMs increase slightly and smoothly until you hit that spot where the RPMs drop off abruptly if you go any leaner. I learned to find the peak RPM, then add richness until you lose - I think it was 60 RPM? (I lost my medical 16 years ago, and I've forgotten a few things.) As I leaned past peak RPM, there was never a point at which the engine ran cooler (oil temp or CHT, but I never used EGT). It just lost power abruptly and almost completely. Nearly all of the planes I flew were carbureted, normally aspirated Cessnas from the 60s and 70s, and only a few of them had an EGT sensor, and I don't think I ever used it to lean the engine. For my very last flight before losing my medical, I splurged and rented - I think it was a 2001 Skyhawk. It had fuel injection, of course, and I'm sure an EGT sensor, but the CFI who checked me out in it didn't introduce any new concepts to me, not that I remember anyway, other than finding all those dang fuel drains during the walk-around. (Other stuff too, but y'know.) Now I can't remember if that plane even had a manual mixture control, but I don't remember the engine shut-down/fuel cut-off being any different from the other Skyhawks I'd flown. (I do remember it being the only time I ever used autopilot other than on my computer sim!) But full-rich isn't only for knock prevention at full power. There are low-power uses too. The "abeam the numbers" memory checklist for VFR approach includes RPM to 1800 and mixture full rich. I remember there being other checklists, like emergency procedures inflight, that called for full-rich. Inflight restarts, for example, and engine overheating for any reason. That's what I was thinking of when I commented about being too busy to deal with proper leaning during landing and emergencies.
Beena Plumber Older / simpler engines with carbs simply aren’t set up or accurate enough to meter fuel at very lean ratios. Also, there may be problems with ensuring the same amount of fuel gets to each cylinder because of the distribution in the intake manifold. Any plane that you’d set up to run lean of peak is going to be fuel injected and have a per-cylinder engine monitor showing exhaust gas temp and cylinder head temp. Full rich is a memory item on downwind so you don’t forget it in case of a go around - same thing with other emergency situations. It’s pretty much ensured that the engine will successfully run at full rich without overheating so you can just shove the knob into the panel and forget about it
Can anyone explain to me why they insist on staying on the shots form the Helicopter, or Blimp or whatever airship they have up there for SO LONG? Seriously.. We are totally missing the race when you are doing that. We can't see the cars at all. Usually from that far up (when they are showing the entire track) one can't see any of the cars at all. Please stay with the Race.
How was the Turner BMW not assessed a penalty, runs into the back of 2 cars, pinches the Lamborghini causing a spin in 30 min... like a freaking wrecking ball out there lol
Douglas Oakley Balance of Performance. Basically, if you were to race a road going Ford GT against a road BMW M8 the difference would be huge, so BoP means that the cars are given equal performance for better racing. It can be disappointing, but it allows multiple factory teams to enter and keeps costs down.
Have the guys over at IMSA been tampering with the fuel tank size of the cars or is it John beng way off again? A regular GTE car should be able to do an hour, not 45 minutes. And a regular GT3 car should easily be able to do 65 minutes on fuel.
Seriously questionable BOP in GTLM right now. Porsche have quite obviously had the dominant car this year, yet they don't cop a BOP adjustment. Yet any time the other manufacturers do well (even if they haven't won), they cop an adjustment to slow them down....for example the Corvette's having to add an extra 10 kg after Watkins Glen which saw them go from being the fastest there to being the slowest (by a fair margin, they were barely quicker than the GTD cars) at Mosport for the next race. After 6 dominating wins from 9 races, isn't it about time that the Porsche's get a BOP adjustment? With 8 minutes to go when they went back to green, the Porsche's were gone, the Corvette's and Ford's simply could not keep pace (the BMW's were basically a non-event). And if not for the late race yellow, they probably would have won by a lot bigger margin. Yet despite how dominant they have been in GTLM, you could almost bet your house on the Porsche's being in exactly the same BOP configuration at Laguna Seca in 2 weeks time.
I'm of the opinion that IMSA kowtows to Porsche on BoP - lest they get all huffy and "pack their bags" for a WEC-only program. It's why I enjoy the Pilot under-series more - things seem much more equitable there.
@@donholl something doesn't seem right with the current BOP in IMSA. Porsche win, get nothing. Others show some speed and challenge the Porsche's....and they get slowed down. For mine it even extends to DPi. After they went well at both Daytona and Sebring, the Cadillac's have been absolutely nowhere ever since while the Mazda's and Acura's keep disappearing into the distance. Yet again, no BOP adjustment to them to bring the Cadillac's and indeed the Nissan's back into it.
@@Holden308 Agreed! I posted on another thread that the same issue seems to be happening in DPi to keep Penske appeased (I'm not so sure with Mazda: they've had many good races where the drivers seemed to be "their own worst enemy", ruining their chances for a podium with wrecks). I also opined there that - if the new mid-engine Corvette starts "kicking ass/taking names" - it'll get punished promptly.
Don't get me wrong, I love watching these races. But right now its become a Mazda / Acura benefit in DPi and a Porsche benefit in GTLM. At least GTD seems to be right, mostly because they seem to stick to the BOP that the FIA currently have for the GT3 class.
John Howell if I remember right they all have to run an engine available for the road car, but it is heavily modified to make it race sensible. So if the road version only comes with a V6, you have to run a V6 (but then there are exceptions to this).
SRA SmokingPuppy841 thank you. That clears up a lot. I realize they are heavily modified and that only makes sense, both for competitiveness and driver safety. I think the cars are amazing. Glad I know more about them.
Big time failed BoP... again. Yellow flag, cars get bunched up, a lap later the two Porsches are gone. BoP is a marketing tool used to get people excited about having close races. Great. On the other hand, manufacturers will lose interest in improving their cars. Why would they pour millions in making a car lighter, quicker and more aerodynamic just to have BoP equalize it to the lowest common denominator? We're going to a place where car brands or models won't matter. It's all about the driver and how fast the crew can change a tire. Want real BoP? Give every driver the exact same model Toyota Prius. Same car, same performance. Otherwise, BoP should only limit the amount of fuel allotted to cars. Everyone gets the same amount of fuel. That will open up opportunities to improve both performance *and* efficiency. That, plus the best driver and crew, wins.
BoP was efficient for qualifying sessions, but not for the main race. It seems that the problem is BoP dont take tyre wearing into account, which disadvantages BMW and advantages Ford and especially Porsche.
@@styreizlefourbe EXACTLY! BoP is great for qualifying because that's a driver's only challenge. You're right again about the BWMs. They fell off the radar since last season whereas they were very competitive before.
So the #3 Corvette blatantly punts the Ford (a move that had nothing to do with the very minor movement by the Ford on the back stretch), blasts a few seconds up the road while the Ford is stuck in the grass, then the Vette randomly drops dead through the first sector, conveniently blocks the ever-living daylights out of the Ford so the #4 Corvette can catch up, then he's magically right back up to speed. And IMSA is like "Yeah thats good stuff, no penalty." Wow. A great race otherwise, I always love going to VIR, but that was absolutely pathetic driving by Garcia and even more pathetic officiating by IMSA.
Спорт
Amazing flag to flag coverage as always. Better than the NBC broadcast. (The IMSA broadcasters actually understand what's going on) Thanks for the upload!
Tbh only the british dude on NBC is bearable to listen to, but John, Jeremy, and Shea are just so fun and informative!
Another race where Porsche BOP looks unbeatable
Love this track, first time I seen the track the Vipers and a couple of other cars were doing wheelies through those awesome esses. Love the grass on the outside of the track it self penalises cars. We need that here around Aussie tracks. Love GT racing
Green flag: 6:26
White flag: 2:46:17
Full-course yellows
1) 23:49-35:22
2) 2:26:03-2:37:32
You guys at IMSA just keep getting better and better. It's my new favorite series!
Hahaa
THANK YOU IMSA!!! WE WERE THERE FOR THAT RACE AND HAD A FANTASTIC TIME.
IMSA Radio rocks! Watched the NBC coverage and the commentary was brutal. Too many commercials. Thank you so much for uploading these races.
The one disliker put on wet tires for a dry track session
THANKS as always IMSA
Lol
John, Jeremy, and Shea are amazing once again! OH AND THEY DID TOUCH!!!!!! 👀👏
Once again, thank you IMSA Official for the timely uploading of the races. It makes it so much easier to keep up with the WeatherTech Championship for fans (like myself) who might not get to see the races live without just getting the results from the official website.
hmmm sleep or imsa.... *pours a coffee*
That was a very eventful race. Thanks IMSA for uploading this race. Much love.
First race I ever attended in the IMSA series. Abandend Nascar and never looked back. The Ford GT was one of my favorite cars, sad to see it go.
VIR is a beautiful track, crystal clear video and audio. Thanks IMSA🏁🚗
Congratulations to the Porsche champions for 2019. I'm loving the sound of a screaming banshee 252 cu. in. n.a. flat 6 at 9500 RPM. They smoked all larger and boosted engines- that's always the Porsche mantra and the legend continues.
Great race, thanks IMSA ❤️
Waiting (and waiting) for the Michelin Pilot Series race - hope it's coming!
Let’s go ford racing!!!!!! Yeah. Thank you for the upload good sir
Been waitin for this one. Thanks for sharing. My favorite racing series. Hope more manufacturers field teams for 2020. A GTD Nissan GTR team would be neat.
Need those stangs and maros first!!! They are hot in gt4!
Thanks for uploading the race, but can you please do something about the awful BoP in GTLM? Porsche has had the best car for every race, except Road America and Sebring, yet they have never gotten hit by BoP while every other GTLM car has been slowed instead.
I don't get why they ruined the best class...
Can you better explain this to me? I don't quite understand. I did some quick research and it looks like Porsche did get hit by BoP but for increased fuel capacity? Just curious if they have some unfair advantage now or something like that.
@@christopherkhan3032 Porsche got a BoP adjustment in the beginning of the season to weigh 20kg less than the car (that won Petit Le Mans in 2018). Ever since than, they have had the fastest car at every track except Road America and Sebring. Despite this, they have not been adjusted once this season, whereas Ford, Chevrolet, and BMW have all had very poor adjustments favoring Porsche even more. BMW has no power, the Ford GT is way to heavy, it is by far the heaviest car in GTLM, and the Corvette gained an extra 10kg after the Glen, which seems to make it slower, but also makes it heavier than the Porsche for the first time. Porsche has the benefits of being a light car (1245kg) AND having more power via their better restrictor in the engine. And the result of that is having the most potent car not because of teamwork, but simply down to the very questionable decisions made by those who give out the BoP. Yes you are correct, BoP adjusted Porsche's fuel number, but this doesn't affect laptime performance.
Thank you for the reply and education! I know there is potential for me to get ripped on here (and that is perfectly fine by me), but I really do hate Porsches. Always been a Chevy and Mopar guy so knowing this definitely doesn't help my already negative feelings towards them. : )
@@joshmiller804 Is it worth mentioning as well that those increases in weight also effect the tyre wear on the cars which limits the amount and how long a car can push on in a stint even after the fuel wears off
thank you for the coverage.
My son and I were at this race and always watch the races on the IMSA channel. My son really wanted to meet John and Jeremy but guessing they never left the IMSA broadcast booth by the bridge. They need to get out and about more when time allows!
Not the closest IMSA race but was still enjoyable. The yellows were a bit ridiculous frankly. It was a quicker yellow to recover a damaged car, repair the tyre barrier and take a driver and a photographer to the medical centre than it was to simply pick up a tyre carcass. The whole safety car/yellow system needs a rethink imo. Creventic seem to manage ok without safety cars. But thanks for uploading and thanks to IMSA radio for the great commentary once again.
If the pits would be open in the last caution, the last car should pit for tyres and some fuel and go for it
thx
Here after watching the 2020 VIR race, really wish Ford stayed and Ferrari made a full entry for GTLM
IMSA again making sure Porsche wins. This is almost like professional wrestling at this point. IMSA just decides who they want to win and adds weight to all of the other cars until they are no longer competitive. BoP sure is fun stuff!
I won't say that they are making sure Porsche wins, but after so many dominating wins (6 from 9 so far this year in IMSA) you'd think there would be a BOP adjustment against them. Yet there hasn't been.
@@Holden308 yeah, it is just disappointing that the argument could be made that IMSA plays favorites. BMW has been way off all year, Corvette has not won a race in two years, and they are either penalized for being competitive or left at the back to try and stay ahead of GTD cars. While that's happening, Porsche is getting 30 seconds to a minute ahead of all of the other cars and winning race after race with no "balancing" after (unless there is a flag to bring the field closer or they screw up their strategy and beat themselves like at Lime Rock). Even in the last 9 minutes of this race, the shower of the two Porsches pulled out a 2 second lead on the Vette in 3rd. That's like 5 laps to get 2 seconds on the field, that sucks as a fan to watch.
@@FredB2332 it just amazes me that Porsche haven't had a BOP adjustment all year despite 6 wins from 9 races, yet others get adjusted whenever they show a bit of speed. The Corvette's for example got an added 10 kg after Watkins Glen (despite not winning, no prizes for guessing who did) and they went from actually being the fastest there to being the slowest and barely faster than GTD at Mosport. All the while the Porsche's keep dominating the field with the same BOP spec that they showed up with at Daytona.
@@Holden308 I agree 100%, which is why it feels like IMSA wants Porsche to win. Now that they have died up the manufacturer's championship I wouldn't be surprised to see IMSA slap a 5kg penalty on them for appearance sake, but the damage is done. It's why Risi Ferrari left. They were sick of the BoP crap. You really didn't have this when the series was the ALMS. Some cars for better at certain courses (which is fine, they have different layouts) but all manufacturers were competitive in the GT field. Now prototypes were another thing, but the GT racing was so much better before IMSA.
When GTLM had a good field even though Ferrari and Aston Martin didn’t join in as they do for GTE. Hopefully it can comback again soon with a bunch of great manufacturers and good racing!!!!
The GTLM class has gone away in WeatherTech Championship competition and in 2022 have moved to the GTD PRO class. Currently for the Roar there are 13 entries including Aston Martin, BMW, Corvette, Ferrari, Lamborghini, Lexus and Mercedes-AMG.
Grounds crew was on point for that cleanup
Technical question from a private pilot: I'm confused. To a pilot, full-rich doesn't mean full-power, or unrestricted fuel flow. It means a fuel/air mixture that has more fuel than can be burned by the air it's mixed with. That's what full-rich means in a carbureted, normally-aspirated piston aircraft engine anyway. It means you're guaranteed enough fuel flow to keep the engine running, though some of it isn't burned. It's really overkill - something you do when you don't want to be bothered with tweaking the optimal mixture, like when you're landing or dealing with an emergency, but it gives you no extra power. It reduces power a very small amount. Is it different somehow in race cars? (There is a LOT I don't know about race cars. I'm fairly new as a fan.) Can they handle the extra heat from running lean, and is there some reason that a lean mixture is the preferred way to save fuel? Wouldn't it make more sense to let the computer determine the optimal mixture and then limit fuel consumption with throttle limits? Thanks!
They use "full rich" colloquially. The GTLM/GTE cars have engine map settings that can be changed by the driver. (I think GTD/GT3 as well but I'm not positive.) They'll have a bunch of pre-set maps on a dial on their steering wheel that change all all sorts of ECU settings. They say full rich to describe the driver putting the car into the mode that delivers the most power possible. Here's a video about torque mapping ruclips.net/video/1cr4uIzkD0k/видео.html It's about f1 but the basic theory applies still. There's also a cool video of Ollie Gaving giving a tour of the Corvette C7R cockpit that'll give you an idea of what sort of extra bells and whistles the driver has available to them.
@@argyleisgreat Thanks! I do like Chain Bear's videos. He's great at explaining things to guys like me who can generally understand things that are more technical but lack the basic knowledge. I have always wondered what map settings were too! When I heard terms like engine map and full rich, I thought of the only thing I understood - aircraft piston engines. In an aircraft engine, MAP means manifold pressure. (I think that's also true in cars, right? Just not in this context?) In high performance piston aircraft, you set the engine at its most efficient RPM, and when you increase the throttle, the propeller blades pitch more steeply in order to maintain that RPM. That translates to more thrust and more resistance to the engine's torque. But in order to know how hard the engine is working (since RPM measurement is meaningless in this setup), exhaust manifold pressure is used as a surrogate measure.
I don't know if you have the slightest interest in aircraft engines, but you've helped me understand racing engines, and I'm grateful. :-)
@@beenaplumber8379 Yes, MAP still refers to manifold pressure, but in this context they call it a map because the computer has "lookup tables" for the important parameters it's controlling. They use manifold pressure, intake temperature, and RPM to decide things like spark timing and fuel mixture by adjusting the length of time the fuel injectors are open. When the drivers turn the knob, they're changing the whole calibration and potentially behavior of the engine.
As for running lean - that only increases temperature to a point. As you go further lean, the temps come back down because the reduced amount of fuel just doesn't have the same energy. I'm sure you've heard of Lean Of Peak running in small airplanes - you just need to watch your exhaust gas temps when you do it. These race car engines (as well as pretty much 100% of cars made since the 90's or so) also have knock sensors that will react to the onset of detonation by adjusting spark timing or fuel delivery to keep the engine safe - that's what the full rich setting in a light airplane is for: knock resistance at full power.
@@Avilator189 Wow, you're challenging my memory! Yeah, I learned about detonation and pre-ignition. Running an air-cooled aircraft engine at full-rich cools it down, which is an important part of preventing the knocking. But while leaning the engine with a constant throttle setting and constant altitude, the RPMs increase slightly and smoothly until you hit that spot where the RPMs drop off abruptly if you go any leaner. I learned to find the peak RPM, then add richness until you lose - I think it was 60 RPM? (I lost my medical 16 years ago, and I've forgotten a few things.) As I leaned past peak RPM, there was never a point at which the engine ran cooler (oil temp or CHT, but I never used EGT). It just lost power abruptly and almost completely.
Nearly all of the planes I flew were carbureted, normally aspirated Cessnas from the 60s and 70s, and only a few of them had an EGT sensor, and I don't think I ever used it to lean the engine. For my very last flight before losing my medical, I splurged and rented - I think it was a 2001 Skyhawk. It had fuel injection, of course, and I'm sure an EGT sensor, but the CFI who checked me out in it didn't introduce any new concepts to me, not that I remember anyway, other than finding all those dang fuel drains during the walk-around. (Other stuff too, but y'know.) Now I can't remember if that plane even had a manual mixture control, but I don't remember the engine shut-down/fuel cut-off being any different from the other Skyhawks I'd flown. (I do remember it being the only time I ever used autopilot other than on my computer sim!)
But full-rich isn't only for knock prevention at full power. There are low-power uses too. The "abeam the numbers" memory checklist for VFR approach includes RPM to 1800 and mixture full rich. I remember there being other checklists, like emergency procedures inflight, that called for full-rich. Inflight restarts, for example, and engine overheating for any reason. That's what I was thinking of when I commented about being too busy to deal with proper leaning during landing and emergencies.
Beena Plumber Older / simpler engines with carbs simply aren’t set up or accurate enough to meter fuel at very lean ratios. Also, there may be problems with ensuring the same amount of fuel gets to each cylinder because of the distribution in the intake manifold. Any plane that you’d set up to run lean of peak is going to be fuel injected and have a per-cylinder engine monitor showing exhaust gas temp and cylinder head temp. Full rich is a memory item on downwind so you don’t forget it in case of a go around - same thing with other emergency situations. It’s pretty much ensured that the engine will successfully run at full rich without overheating so you can just shove the knob into the panel and forget about it
..those RSR luvem in all sim racing titles also
Consider highlight videos please. I watch every Formula one highlight video, but I far prefer IMSA. I just don't have time for a three hour video.
The Michelin Man waved the start flag :)
The only way I get through work....IMSA!
Still waiting for you to upload the Porsche GT3 Cup Challenge race...
That Lexus pitstop: you may as well have put it back on the trailer at that point.
6:27 Race Starts
35:24 End of 1st Full Course Yellow
Nice job Porsche!
Nice job Ben Keating and Jerone Bleekemolen!
2:49:00 When did PISSED become colorful language? lol
Who else in quarantine
Nice
How do we watch these races live from home?
Gian Kendall get the imsa app that or nbc sport channel will air it
Can anyone explain to me why they insist on staying on the shots form the Helicopter, or Blimp or whatever airship they have up there for SO LONG? Seriously.. We are totally missing the race when you are doing that. We can't see the cars at all. Usually from that far up (when they are showing the entire track) one can't see any of the cars at all. Please stay with the Race.
How was the Turner BMW not assessed a penalty, runs into the back of 2 cars, pinches the Lamborghini causing a spin in 30 min... like a freaking wrecking ball out there lol
Can I get a GTLM BOP?
Was so sad to see the Paul Miller Racing Lamborghini have another stroke of bad luck at my first race :(
I see the letters BOP a lot...what does that mean?
Douglas Oakley Balance of Performance. Basically, if you were to race a road going Ford GT against a road BMW M8 the difference would be huge, so BoP means that the cars are given equal performance for better racing. It can be disappointing, but it allows multiple factory teams to enter and keeps costs down.
Is there not enough room for DPi too?
There are a couple of races where prototypes are excluded and a couple where GTDs are excluded due to shorter tracks or narrower width tracks.
No. This track is incredibly narrow, prototypes wouldn't fit.
Porsche, the team I love to loathe. Great racing though.
Why are GTs the only cars raced here? Seems large enough to accommodate the prototypes
Nicky G to help keep costs down, as DPi budgets are already huge.
Have the guys over at IMSA been tampering with the fuel tank size of the cars or is it John beng way off again? A regular GTE car should be able to do an hour, not 45 minutes. And a regular GT3 car should easily be able to do 65 minutes on fuel.
Seriously questionable BOP in GTLM right now. Porsche have quite obviously had the dominant car this year, yet they don't cop a BOP adjustment. Yet any time the other manufacturers do well (even if they haven't won), they cop an adjustment to slow them down....for example the Corvette's having to add an extra 10 kg after Watkins Glen which saw them go from being the fastest there to being the slowest (by a fair margin, they were barely quicker than the GTD cars) at Mosport for the next race.
After 6 dominating wins from 9 races, isn't it about time that the Porsche's get a BOP adjustment? With 8 minutes to go when they went back to green, the Porsche's were gone, the Corvette's and Ford's simply could not keep pace (the BMW's were basically a non-event). And if not for the late race yellow, they probably would have won by a lot bigger margin. Yet despite how dominant they have been in GTLM, you could almost bet your house on the Porsche's being in exactly the same BOP configuration at Laguna Seca in 2 weeks time.
I'm of the opinion that IMSA kowtows to Porsche on BoP - lest they get all huffy and "pack their bags" for a WEC-only program. It's why I enjoy the Pilot under-series more - things seem much more equitable there.
@@donholl something doesn't seem right with the current BOP in IMSA. Porsche win, get nothing. Others show some speed and challenge the Porsche's....and they get slowed down.
For mine it even extends to DPi. After they went well at both Daytona and Sebring, the Cadillac's have been absolutely nowhere ever since while the Mazda's and Acura's keep disappearing into the distance. Yet again, no BOP adjustment to them to bring the Cadillac's and indeed the Nissan's back into it.
@@Holden308 Agreed! I posted on another thread that the same issue seems to be happening in DPi to keep Penske appeased (I'm not so sure with Mazda: they've had many good races where the drivers seemed to be "their own worst enemy", ruining their chances for a podium with wrecks). I also opined there that - if the new mid-engine Corvette starts "kicking ass/taking names" - it'll get punished promptly.
@@donholl yeah that wouldn't surprise me. Right now in GTLM, about the only thing that can beat the Porsche's is themselves (like at Lime Rock).
Don't get me wrong, I love watching these races. But right now its become a Mazda / Acura benefit in DPi and a Porsche benefit in GTLM.
At least GTD seems to be right, mostly because they seem to stick to the BOP that the FIA currently have for the GT3 class.
2:20:00
16:00
6:18 GT LE MANS GT DAYTONA START
Hey kyle
Lexus overdose...
OK. . .So we (USA) made it to the moon and back safely 6 times. . .BUT we can't build a car to match or beat Porsche? Really??? WHY???
Ford block his team mate to let other pass WTF!!!
I'm pleading stupidity but what engine modifications are they permitted in these cars? I love this kind of racing.
John Howell if I remember right they all have to run an engine available for the road car, but it is heavily modified to make it race sensible. So if the road version only comes with a V6, you have to run a V6 (but then there are exceptions to this).
SRA SmokingPuppy841 thank you. That clears up a lot. I realize they are heavily modified and that only makes sense, both for competitiveness and driver safety. I think the cars are amazing. Glad I know more about them.
Why is it, no matter who drives for Porsche, they are THEE dirtiest drivers in professional motorsports?
what?
Notice me senpai!!
the #911 Porsche has win from VIR It's a for Cover car from GRID 2019
Big time failed BoP... again. Yellow flag, cars get bunched up, a lap later the two Porsches are gone.
BoP is a marketing tool used to get people excited about having close races. Great. On the other hand, manufacturers will lose interest in improving their cars. Why would they pour millions in making a car lighter, quicker and more aerodynamic just to have BoP equalize it to the lowest common denominator? We're going to a place where car brands or models won't matter. It's all about the driver and how fast the crew can change a tire.
Want real BoP? Give every driver the exact same model Toyota Prius. Same car, same performance. Otherwise, BoP should only limit the amount of fuel allotted to cars. Everyone gets the same amount of fuel. That will open up opportunities to improve both performance *and* efficiency. That, plus the best driver and crew, wins.
Well said.
Yup that’s true
BoP was efficient for qualifying sessions,
but not for the main race.
It seems that the problem is BoP dont take tyre wearing into account,
which disadvantages BMW and advantages Ford and especially Porsche.
@@styreizlefourbe EXACTLY! BoP is great for qualifying because that's a driver's only challenge. You're right again about the BWMs. They fell off the radar since last season whereas they were very competitive before.
1:30:34 are you French or something
RUclips I dimon
Time teme
Move teme show.
No game teme car.
Evolaxstom
So the #3 Corvette blatantly punts the Ford (a move that had nothing to do with the very minor movement by the Ford on the back stretch), blasts a few seconds up the road while the Ford is stuck in the grass, then the Vette randomly drops dead through the first sector, conveniently blocks the ever-living daylights out of the Ford so the #4 Corvette can catch up, then he's magically right back up to speed. And IMSA is like "Yeah thats good stuff, no penalty." Wow. A great race otherwise, I always love going to VIR, but that was absolutely pathetic driving by Garcia and even more pathetic officiating by IMSA.
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