Boost Pressure Explained [GO FAST BRETT]
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- Опубликовано: 3 июл 2017
- Ever wanted an easy explanation of how boost pressure works? Well here it is!
This series is proudly brought to you by Mighty Car Mods and GFB
www.gfb.com.au
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![Is it safe to vent your Blow Off Valve to atmosphere? [GO FAST BRETT]](/img/1.gif)
I'm a car guy and have been as long as I can remember, and I thought I knew about pressure ratio's and everything else mentioned but I learned something, thank you! well done and please do more video's like this.
Absolute vodka to measure absolute pressure...
GeebusCripes and Boost to measure boost! 😱
This was really informative! I like it
!
RegularCars I like you.
We need to chat on fox in space stream discord again it was fun
DAD!
BROWN
But mum!! It has a turbo for efficiency.
This has been the most interesting episode in this mini series yet!
brilliant clip! this answered so many questions for me, and the oil/liquid was strangely hypnotic...
Good to see Go Fast Brett back on the channel!
gatta say i definitely appreciate the Go Fast Brett episode series.
For sure helped me understand this better. Living at high altitude is quite annoying.
look at the bright side, when you do go down to sea level you'd have more power than your used to
I hated my move from DC to colorado, I lost 34whp on my n/a accord way back then
also I have to say; fuck 91 octane
#100octlife
It might be annoying now, but you must feel like a superhero at sea level.
I just came back from a 2 week vacation in colorado. It was quite fun experiencing turbo lag. (my car has a small turbo, so it rarely lags) Mash the throttle and very little happens, then like 1-2 seconds later you take off like a rocket ship.
*laughs in Floridian*
Great explanation, thanks 😁👊 I drive for Saab Turbo and made a hole in my Hood so a bit of my new High Flow airfilter sticks out and breathes cold air, it made a huge difference in performance. Heat is also a thing people forget to take siriusly I'll think and I will work much with heat transportation this winter.
Thanks for all the valuable info Brett.
gottit drink vodka drive faster. thanks brett
Vert good explained about the nessesary of intake modify for turbo cars
nice video. Almost all mining equipment and some cars have atmospheric pressure sensors as well as map sensors (some use the map and have a vsv before map to read atmospheric on startup) to read the atmospheric pressure and adjust the fuel map.
these explanations are fantastic.
awesome to see go fast brett back
Great video learned a lot. I'm not sure if you guys take technical questions or maybe someone in the comments knows this but I'm still wondering if the same boost pressure affects power if the turbo is different. For example if you ran 17 psi of boost through a stock turbo and 17 psi of boost though a much larger turbo is peak power the same? I understand that the response and other factors would be different and the larger turbo is capable of holding more boost but i'm wondering if there is a benefit at the same boost level.
This series is great.
Brett is back, people!
Cool! First time I've learned something watching MCMTV2 ;)
Thats really a simple way of explaining thanks
can you please answer me this? in stock performance unmodified cars, which one is affected by altitude more? a turbo or an NA one?
Great video, I learn't a lot!
good educational video, thank you!
this was great! thanks man!
Dope intro!
Thanks for the explanation Bill Nye!
These videos are awesome
Woo Brett it's been a minute was wondering if you were still alive bud
very informative!! thank you
I have a 2013 genesis 2.0t, what if it stays on negative psi or at 0 and I have to be on 4th gear at least and about 4000rpm for it to go max 5psi?
awesome vid
What a perfect explanation
"run no air filter like a hero" XD
perfect explanation, ty
great info 👍 mate
So what ur saying is my n/a motor is on 1 atmosphere of boost n/a then right
So how do u get a car to intake more psi?
You the Best Man
So would the same theory with altitude, apply to cold weather? Here in Canada, when the outside temperature is around 0 degrees Celsius I start to over-boost, and when the temperature is down to -20 or lower the car over-boosts with even moderate throttle.
My car boost to like 12psi in winter and 20psi in summer (Canada as well)
that was well explained,
I need a bigger intercooler now, thanks... Brett
How/does humidity effect boost pressure?
Simple and effective... and now I am craving *Vodka.*
will it fit my honda?
its kind of like engineering explained like im five, i really like it!
MCM should do Pikes Peak. Come visit Colorado!
Brilliant!
Said so well even I understood it.
Go Fast Brett! With Vodka!
Something that Brett didn't mention: a Bar is a unit of pressure, not quantity, and temperature affect greatly the pressure of air.
So having 2 bars of air at 25°C (80°F) means having roughly 6% more air than 2 bars at 60°C (140°F).
I understood all these concepts but I didn't realise how dramatically atmospheric pressure dropped with altitude, I didn't think the drop off would be nearly as profound.
Could you guys do a video explaining what exactly is "Turbo Flow Rate, such as lb/min" and boost. I can't seem to understand it. I hear of people running 24psi with a "higher flowing" turbo, making more power than someone running 28psi.
smevox good question!
Brett please, next video: compressor maps!
There is your answer. Each turbo has its own specific compressor map. Google it and have a look at some diagrams. There is always and area in the middle where the turbo is performing most efficient.
MCM Please do this. Would be great to see GFB cover something a little more complicated.
the easy explanation is that the bigger turbo has more room, so it can move more air at a lower pressure. Just think of a small and big hose. If both hoses had the same pressure flowing through them then the bigger hose would flow more lb/min so it would need less pressure to flow the same amount of lb/min.
Remember psi is pounds per square inch. That is, a force per an area. If you want more power, you have two options, increase the force (turn up the boost) or increase the area (use a bigger turbo). A big turbo will move more air than a small turbo, even if they're both running the same psi.
great!!
"Hopefully this visual representation has BOOSTED your understanding..."
Marty wrote this script, didn't he? Unless Brett's just pulling a FAST one.
MCM boys already showed that air intake setups are pretty much all the same. No gains from pod filter vs factory air box and paper filter. Granted it was a one car test but I doubt that most cars have very restrictive air intake setups these days.
love it
So irritated you didn't match the levels in the bottle. That's like 2.1 bar. Smh
rip my ocd
Alain Sabido yo nice profile picture
+lelouch britannia yo nice name
I have a 2013 genesis 2.0t, what if it stays on negative psi or at 0 and I have to be on 4th gear at least and about 4000rpm for it to go max 5psi?
High altitude = less boost...
So drive my WRX into the ocean fpr maximum KW increase?
You didn't mention that the higher you go the lower the atmospheric temperature though. Or even how altitude affects the concentration of available oxygen
sweet!
I still don't quite get the additive vs multiplicative distinction for absolute pressure.
1 bar atm + 1 bar boost = 2 bar total and 0.8 bar atm + 1 bar boost = 1.8 bar total. Where does that go wrong?
Brent Allen when you go higher in altitude from sea level
Higher in altitude explains atmospheric pressure being lower, but it still looks like 0.8 + 1 = 1.8 to me rather than some multiplication operation.
Brent Allen 1 bar atm × 2 = 2 bar total
.8 bar atm × 2.5 = 2 bar total
the higher the ratio, the harder the turbo has to work, and the harder it works, the more power it saps, the higher the intake charge temperature, etc.
the ratio is more important than the values in determining losses, since the lower the ratio, the less your turbo needs to work to achieve the same level of boost.
Well explained but what happened to the Vodka? :)
Curious how all this would relate to piston-engined aircraft turbos at high altitude!
Luke Chapman It's the same problem. They started using forced induction on airplanes to counter the thin air at altitude and the loss of power that created. While you'll still loose some power it isn't as bad with forced induction.
so when someone tells me that his boost is 30, wtf does it mean
so run a high flow air filter? got it.
NO, didn't you listen?
*Remove the filter altogether - like a hero*
some people hey
Very informative, but it looks like he consumed the bottles (bloodshot eyes) before filming. =)
OR punched a few Gatorade bottles beforehand!
Does this count as college credits? I'm about 140 shy of a degree.
I think I need to watch this again so that I can understand it 😢
But what does Absolut vodka equal?
And so many people think intakes for cars are useless or not worth it. Maybe a subtle power gain, but temps stay lower and the turbo doesnt work as hard.
never left pornhub so fast!
will the thing on your face fit my Honda?
Brett you saucy devil
but can someone explain this to me:
why is it that a 28mm turbo running 10psi will make less power than a 62mm turbo running 10psi?
JDM Viking because the 28mm is pushing less volume than the 62mm. the pressure is the same but the 62mm can push more air at the same pressure
ahhh i see
Being a mountain dweller is anoying for sure. My house is around 5000ft, or 1500m. Would larger turbos effectively counteract this? (larger volume for lower density).
Or perhaps more pressure and a leaner injection of fuel? I have no Idea, just brainstorming.
Justin Fābïø smaller turbo. more spinspin, more kaboom, more bwaaap.
Justin Fābïø Electric car with good range is your answer. Powering your wheels with a machine that delivers less power the higher you go is just silly.
I have a twin turbo set up, and the stock 9bs are already kind of small. So just more boost? He said in the video the turbo is already forced to spin faster and heat is an issue at higher altitudes. I guess thats what my intercoolers are for. I have a 91 Mitsubishi 3000gt VR4, just thought I'd mention.
ArchimedeanEye One day maybe, some of us are still under 20 and don't have that kind of cash to get an electric car thats faster, and can go as far as the fossil fuel powered equivelants we can get for the same price.
Plus living in the mountains, The temperature drops down to -30 F (-25C ish). Batteries do not perform well, or last long at those temperatures. I build and fly model aircraft and the difference is noticible when the temp drops.
It seems the only real solution is moving!
Its 5pm somewhere
Good good
Never thought about this before, very informative. P.S good joke
sea level cold night perfect for boost ;)
yay.
Hey I live near pikes peak
Moooole!
I want to know what happened to the 1.5 liters of vodka
I am more intrigued by the magic trick of fluid density than the hair dryer science.
Ahh, the joys of living at 1300m above sea level...
i like how he used vodka because it is just ethanol and water so it is basically e85
No air filter and run it like a hero :'D
So what you are saying is I should move to the seaside? Damn.
Liked for the pun
where's Rake?
Somewhere loving it.
so drink less vodka = more absolute boost 😎
thumbs up at " boost pressure explained with.....VODKA"
..and then there's the whole other topic of "why does it run better after it's recently rained?" going under the same general gist
cooler air, high moisture (think water/meth injection)=more efficient bang = more power :)
LOL
So double atmospheric pressure is 14.7 =29.4 psi? lol
Lime That's why there are two different measurements for pressure - psig and psia. One measures with the atmospheric air pressure included, and one does not.
I understood boost pressure before I watched this.
do you think it was a good explanation
Mole Pressure
i consider myself a pretty technical guy but, those bottles confused the fuk outa me lol
Instructions unclear; have been arrested for DUI.
MOLE!
im confused