The Secret Porsche System to Know Before You Buy! Kennan Explains!
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- Опубликовано: 5 июл 2024
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On this episode, Kennan Rolsen, Managing Editor or Cars & Bids explains the ins and outs of the Porsche DME system, specifically the Over Rev report, unique to Porsche. This is valuable information to have when bidding on your next Porsche on Cars & Bids.
CHAPTERS:
00:00 Introduction
00:28 CARS & BIDS!!!
00:55 What is a DME?
01:22 Unique Benefits From Porsche's Design
01:41 RPM Ranges For Different Models
03:05 Breaking Down the DME: 2004 996 911
09:33 Breaking Down the DME: 2007 911 GT3
13:36 The 3rd Thing to Keep In Mind About DME Reports
14:35 Outro
#carsandbids #kennan #porsche #overrev #dme 
Авто/Мото
Doug is the type of guy to make Kennan pay money every hour he uses his carrera gt
More like every second
Okay, now you absolutely have to do a DME report on Doug's Carrera GT. Can't wait to see that one!
Engineering Explained liked this video
Except for the flawed math
Also, I believe it is slightly incorrect to divide by the red line RPM. The time spent at a given RPM value depends on that specific RPM value itself. We don't know the exact RPM value but we know a range, therefore you should divide by the bottom or top range value. Or better still, divide by the center of the RPM range.
This would bring, for instance, the last number you showed for the GT3 from 0.14 s to 0.13 s. Not a huge difference, but in the interest of science... 🙂
Exactly what I was thinking.
I am surprised that very few people noticed this. But this is the kind of science/math we would expect from a dealership guy.
@@RaininghellI respect Kennan. It was either an oversight or something he did to simplify the calculation and make it simpler for most
I agree it would be more accurate, but dividing by the redline RPM would give a conservative number (longer than actual).
@@odlyentertaining correct.
Even as a 996 911 owner, this is a supremely nerdy thing to care about. 😅
As a 996 911 owner, you have other things to worry about
@@Shmee149 I just drove it from Pennsylvania to Colorado and back. It has the IMS service. The powertrain has been fine. Some other issues like the window regulators and doing the tape over the damper to replace the foam in HVAC. Yeah, that’s annoying, but they’re not crazy unreliable in my experience.
I am so happy that Doug brought Ken on board. I am all here for this. Please keep making these types of videos. Could you mention where we get the data used?
Now I finally know what Clarkson felt like when he’d zone out while James would blabber on about something educational
you shouldn't be dividing by the redline rpm but the average rpm in the range
He is erroring on the side of his number being larger than actual, correct?
@@EdDale44135 at least put the minimum rpm for the range one is calculating not simply the redline.
Fiona, is ALWAYS impressed by Kennan's math skills ... its why she married him...
Emily hasn't been served divorce papers yet.
@@truthserum5310 🤣Now Rene, is going to be really confused
How is she impressed when he forgets to put units on the numbers? That is some middle school stuff to do
@@wile123456 lol
U nerds appreciate these rando fools who know nothing about the feel of cars or have the skill to push? Go ahead. When I see Doug's podcasts I can see all yes men with no soul. Doug and the rest are trash. Even Doug other than features never seems to put any verbal inputs on how the cars feel etc. Smoking tire it's not. 🤦🏻♂️
Didn't know this existed. Thank you for sharing the knowledge!
Kennan is a natural in front of the camera! 🎥
He’s truly come a long way.
For range #2, shouldn't you divide by 7250 instead ?
Very informative video. Thanks!
Shouldn't you divide the first time with the rpm range that it is counted in not the redline?
they forgot to actually link c&b in the description, lol
Great Job Kennan ! Happy to see you working on the family channel! 👍
Kennan realy makes some of the most interesting videos! Love this stuff!
Great content. Really enjoy Kennan breaking down the what's-what. He's really the man behind the curtain on these high-end cars, and this format matches his style. Well done.
See kennan. Upvote. He always delivers.
Thanks for this information!
Kengineering explained
This is absolutely brilliant and also I am going to watch it again tonight when I need to fall asleep.
Kenngineering Explained? ☝️🤓😳
This video was extremely informative Kennan👍 I had no idea that ECUs on Porsches were not only called DMEs but could also produce such a staggering amount of data. Fascinating to say the least.
Interesting topic about what is logged other than error fault codes.
I'm thinking about picking up a Cayman (thanks Filippo). Does a decent aftermarket code reader, one that can display live sensors, access this data?
How does one get a DME report for a Porsche that is for sale? Is there a specific OBD2 device? Can it come through something like a Blue Driver tool + app?
I love Kennan
The gt3 numbers seem like it was in a money-shifting situation but the driver felt it as he was letting the clutch out and pushed it in as he felt it revving up!
I will say, as a maths and analytics guys, I absolutely loved this video
Could i check this in my twingo?
I am blown away at just how many ignitions can happen in half a second. I’ve always known what RPM means, obviously. But never put together how many ignitions there are in such a short time frame. Super interesting
A masterclass
To be precise, 65535 is the max value, not 65536.
65535 is the maximum unsigned number you can represent with 16 bits
I unfortunately will never have enough money to buy a Porsche but this is a good system to know I really wish that I use this when I. Got my new Chevy Silverado but it's all good. I have a good truck and it's good information to know going into other vehicles or assisting my friends thank you
If you can afford a brand new Silverado then you can easily afford a good condition 986 Boxster
@7:05 Stupid question: Why you did not used the 7250 rpm instead of 6750 rpm for the second calculation?
Missing on key bit of information. Where do you get the range values for all the models? E.g. 981?
google, or owner's manual
It is important to note that the calculation for the time the engine has been over redline is the MAXIMUM amount of time. If the engine was revved much more than redline then the amount of time would be lower, but the RPM's would have been higher which would put more strain on the Engine.
Excellent breakdown, Kenan! We can all see what Emily sees in you; yours is truly a polycule we can all aspire to.
Not sure I understand the turbo example. It had 12k ignitions 3 hours before the report was taken or 12k over the life time and the last one was 3 hours before the report was taken?
Ima let you finish, Kennan Rolsen, but Jason Fenske is the greatest whiteboard engineer OF ALL TIME.
Definitely looking forward to a future Kennan/C&B/EngineeringExplained collab.
Lol @ “ I would ask about that shift”
Great video, love when math comes into play but you lose points for not showing units or deriving equations 🤣
Perhaps I missed the explanation, but shouldn’t the denominator be higher than redline given these are reports of when the engine is going above that mark? The second one especially should be atleast 7250 instead, knowing that we are above 7250 rpm.
What is the easiest and cheapest way to get a dme report? Can you diy?
My 987.2 manual has a rev limiter. All these cars have one. How the heck do you over rev with an electronically governed drive-by-wire throttle??
Exactly my question.. what is the rev limiter for then?
I Google searched it. It happens when you shift down to early, the rev limiter won’t work because it only limits the ignition not the rotation of the engine.
If you shift into 2nd at 70Mph and lift the clutch, there is nothing the ECU can do to stop the engine speed increasing to match the wheel speed.
Kennan just put me back to school.......
That 996 owner probably got the report right after that over redline shift since they knew they messed up….
If you're not getting to redline then you aren't enjoying your Porsche. A Porsche is most fun running between 4,000 and 6,000. You can run 2nd and 3rd all day there or you can flog your car on a track and it'll keep coming back for more. Not concerned about the DME. Drive, enjoy, repeat.
We need to fill Kennan's comment section with "Doug is the type of guy"
You are calling out the village idiot group, huh? Let them save their energy and feeble intellects for their careers in fast food.
Wait. Hold on. Why are you dividing by redline? Shouldn't for the GT3 you divide by 9,000 for range 1 and 9200 for range 2?
Emeily amd fiona and Jeniffer are so lucky to have u wow
Do these Porsches not have fuel shutoffs? I would have expected the computer to shut the fuell off long before these engines hit 11,000 rpm. Like, before the clutch is fully engaged during the downshift. No fuel = no ignition spark = no DME counter. Right?
Once you lift the clutch there is nothing the ECU can do to prevent engine speed increasing to match wheel speed
@@PointNemo9 But if the ECU cuts off fuel and there's no ignition spark, there's nothing for the DME counter to count, no matter what the engine rpm is.
Should have shown an example of a bad DME report
I don't know how I'm going to ask the dealership this.
Makes me worried about what my report will say…
Doug is the type of guy to make Kennan do math.
Apparently, Kennan has never heard of an IS F….. it’s got an automatic transmission and can overrev for days…..
Wow, can you over rev an IS F?
Great review, much better than Doug who isn’t smart enough to remember all these details
Would have been helpful to show a bad one.
not putting units at the end of the numbers when making equations like this is painful to watch
Sir I didn’t do the homework
The real ones learned about the overrev counter from Bumper to Bumper.
Not a secret!
Kennan is the type of Doug who cares about DME reports.
Doug is a Porsche Guy
Is it possible to reset the DME counts?
6:54 35.93 seconds and write 39.93 and reconfirm it’s 35.93 seconds without noticing it’s thirty NINE 😅
Really fishing for video ideas with this one 😂
Kennen representing nerdy Ohio.
Need a DME report on my wife
I have a test system for that at my house….
Well this is this is so dull it’s almost interesting….almost 😂
lol
I'm already not in love with the Carrera GT, but wow, grey/silver & brown/tan, it reminds me of a cold Autumn or Winter day, no excitement, just a bleak look.
But yeah, that's just me.
Tesla is the best car company ever! No gas stations, No oil changes, No smog check, No corrupt dealership, No catalytic converter and as fast as a $650,000 Lamborghini.
Day 40 of infinity asking for a job.
Nope.
Porsches, not my cup of tea...
That's because you are broke.
Big Ford Escape fan, I’m guessing?
Low key boring
I'm getting sick and tired of the supercar bullshit on this channel.
Then leave
Calm down, Francis. A regular Porsche 996 isn't a super car.
Bro what are you on about?
This applies to literally all porsches kind sir
Should apply to all sports cars. Surely they have similar reports available for Ferrari, Lambo, Aston, Mercedes, etc.
The problem is Cars& bids decide the low reserve price on your car so I went with eBay motors. Free is not better.