Very well explained. Clearly you have grasp of fluid dynamics and understanding of fluids in motion and the effects of viscosity. Most people have difficulty understanding constant flow and that we phase in and out of it as engine speed varies, while pipe diameter remains constant. Variable valve timing has become common place. However, variable exhaust is not something that is focused on in the after market. Many car companies have started incorporating variability in mufflers, but the most of after market is far behind.
Agreed that it's widely misunderstood topic/term. Too many people want to see it virtually eliminated . . . or maintained at some unspecified and unknown value. It was refreshing to pick out of this video that backpressure is only the force required at the engine end (divided by inside pipe areas) to actually cause the volume of exhaust to be pushed out the open end. Backpressure is inescapably tied to exhaust gas velocity through the exhaust system, and you probably want as little of the first that gives you enough of the second. Since one engineering rule of thumb is every extra psi of backpressure will cost you about 2.5% power, backpressure, exhaust velocity, and power are all tied together.Time was when 'reducing backpressure' was almost something worth doing just for itself, back when mufflers and (early) catalytic converters were both crude and highly restrictive. But these days even the OEmanufacturers can't leave this sort of "low-hanging fruit" on the tree.Resonance tuning is a whole 'nother topic that's sort of related.Norm
Thanks for making the video but it is somewhat misleading since you are talking about application settings mostly for stock aspirated cars and showing mostly modified turbo vehicles where back pressure requirements and effects are completely different and run in contrast to the points you are trying to make.
I understand that this video is flawed in many ways that's simply because I didn't care much during the earlier days of this channel and I'm trying hard to change that attitude.
Dude, nice topic for a video as this is a very important concept to understand when tunning your engine but... It is very difficult to understand many important parts of your explanation... Could you please summarize the idea? Why do you need backpressure and how is it related to having a catalytic converter or not? For instance, what differences in performance would there be between a straight pipe and one with the CAT... I'm considering replacing the stock exhaust of my bike with an aftermarket one but I still don't fully understand why this improve performance. Thanks in advance.-
So what you mean to say, you only need a small amount of back pressure. Don't use extra large piping, cause it's only good at high revs. Basically you mean, don't over do it, right?
Not total bull shit but I call bullshit on backpressure not increasing engine performance. I had a car with 7psi of back pressure and when I got it fixed the engine probably had a 60hp increase. I say this because the car went from 7:50s in the 8th mile to 7:30s. That was way back in the 1990s with a Turbocharged Buick V6.
Very well explained. Clearly you have grasp of fluid dynamics and understanding of fluids in motion and the effects of viscosity. Most people have difficulty understanding constant flow and that we phase in and out of it as engine speed varies, while pipe diameter remains constant. Variable valve timing has become common place. However, variable exhaust is not something that is focused on in the after market. Many car companies have started incorporating variability in mufflers, but the most of after market is far behind.
thank youuu, come again!
thats what she said
If you can't understand, watch a different video, not bitch about it. Keep up the good stuff man!
Excellent explanation.
Hope you find it informative. Look forward to hearing from you in the future.
Agreed that it's widely misunderstood topic/term. Too many people want to see it virtually eliminated . . . or maintained at some unspecified and unknown value. It was refreshing to pick out of this video that backpressure is only the force required at the engine end (divided by inside pipe areas) to actually cause the volume of exhaust to be pushed out the open end. Backpressure is inescapably tied to exhaust gas velocity through the exhaust system, and you probably want as little of the first that gives you enough of the second. Since one engineering rule of thumb is every extra psi of backpressure will cost you about 2.5% power, backpressure, exhaust velocity, and power are all tied together.Time was when 'reducing backpressure' was almost something worth doing just for itself, back when mufflers and (early) catalytic converters were both crude and highly restrictive. But these days even the OEmanufacturers can't leave this sort of "low-hanging fruit" on the tree.Resonance tuning is a whole 'nother topic that's sort of related.Norm
Thanks for making the video but it is somewhat misleading since you are talking about application settings mostly for stock aspirated cars and showing mostly modified turbo vehicles where back pressure requirements and effects are completely different and run in contrast to the points you are trying to make.
I understand that this video is flawed in many ways that's simply because I didn't care much during the earlier days of this channel and I'm trying hard to change that attitude.
Dude, nice topic for a video as this is a very important concept to understand when tunning your engine but... It is very difficult to understand many important parts of your explanation... Could you please summarize the idea? Why do you need backpressure and how is it related to having a catalytic converter or not? For instance, what differences in performance would there be between a straight pipe and one with the CAT...
I'm considering replacing the stock exhaust of my bike with an aftermarket one but I still don't fully understand why this improve performance.
Thanks in advance.-
So hard to understand...
Soooo is it good or bad...?
thank u pls come again
Easy explanation. Engines run best with no back pressure. End of story.
Bingo! Back pressure is counter productive! Anyone that says you need back pressure is misinformed.
Exactimundo 👍
without backpressure you lose low end torque
@john beaver if not tuning only
So what you mean to say, you only need a small amount of back pressure. Don't use extra large piping, cause it's only good at high revs. Basically you mean, don't over do it, right?
I CAN UNDERSTAND YOU
Back Pressure defined as pressure exerted upon the piston. 0 back pressure is good, negative pressure is best. Scavenging is relative to drafting.
Good content, thanks for taking your time to put it up. Don't mind the "haters", they're ignoramus'
Why not use one way valve to eliminate back pressure at exhaust...
I am pretty sure it was good information. My South Carolina ears just couldn't catch it. Have to get my bud at work to cc it for me....
Not one word........
Not total bull shit but I call bullshit on backpressure not increasing engine performance. I had a car with 7psi of back pressure and when I got it fixed the engine probably had a 60hp increase. I say this because the car went from 7:50s in the 8th mile to 7:30s. That was way back in the 1990s with a Turbocharged Buick V6.
I learn more from the comments then some of these videos lol
So accented !
So just have no exhaust at all just run it straight from the engine
is anyone else reading his comments in the same accent? hahahahaha
Brickhouse boxmodz I am now lol.
Maybe its just me, but since i started going to college this is easy to understand lol
I believe he was saying "velocity" not what you heard "viscosity."
Where was it exactly?
No, the fluid's "viscosity" is the correct term. (Gas is a fluid believe it or not)
Back prshe
put sub-title instead
Adipoli bro number kitto?
Does your voice have a back pressure?, You sound like an Indian record machine.
Umm.. a little bit, but truth to be said, your comment made me lmao..
Yes it has
So hard to understand what you're saying.
Thank my friend, highly appreciate it.
congrats!
Oh dude such an English pronunciation
Oh dude such a grammar
Speak english
Pretty sure he is buddy. Ever hear of an accent?