The Back Pressure Myth

Anyone who's spent time on forums or the comment section has undoubtedly heard the mention of exhaust back pressure and its relation to low-end torque, but does this hold any truth?
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Credits:
Videos submitted by
Hector Alba
Tyler Maenza
Brooklyn Wheatley
Jack Rostron
FOO WEI KHANG

[@imnota]

You literally explained everything except why back pressure is important / not important. Nice job.

[@hendrikskrijn]

IMNOTA back pressure is needed when you have a 2 stroke engine

[@philiprowney]

Mighty Car Mods proved this 'in camera' Spherical back-pressure oscillations help the exit of gases, this tuning is mandatory for 2 strokes and needed for longevity on 4. The times I see 'open headers' and they blame the cam for the 'chop'.

[@numinous4789]

You weren't listening - he debunked the myth that backpressure is the primary consideration - it isn't. That's why so many people get confused regarding this, from an engineering standpoint.

[@maxd6663]

IMNOTA You're right! He told what everybody knows but didn't say if it's good or bad. Stupid video without conclusion!

[@maxd6663]

Numinous Back pressure is very important! You loose all the low end torque and it really ruins efficiency of a daily driver car and not so noticeable on race cars as they go high revs all the time. It feels the most if you go straight piped with no mufflers. One time I literally had to put muffler back on my straight piped Jetta VR6 because it became similar to turbo lag. Bad feeling on N/A car.

[@klappars]

You didn't explain why back pressure might be thought to reduce torque.

[@HPAddict]

Leo Best as to what I understood, because of slower gas travel it tends to create turbulence thus robbing torque. It could occur because of poor selecion of exhaust pipe diameter.

[@carlovermk2506]

Leo Best i see you like Hpi

[@zachmiller9175]

Because you want the correct exhaust size, with low back pressure but no turbulence and decent scavenging. Too small and you kill power too big you kill torque. The myth is that bigger always means less torque when it's really just when you go too big

[@FlavienS57]

I think, because of a possible loss of scavenging, the burned gas in the cylinder could not be well ejected from the cylinder, allowing burned gas to stay for the next combustion, and makes it less efficient. I think it is where the myth come from ?

[@FlavienS57]

no

[@DC-pe3fr]

This is like a low rent version of Donut

[@trident4555]

James ftw

[@mlndr8551]

David Cammaerts its kid of the other way around because we know Car Throttle for years

[@mlndr8551]

Kind of*

[@DC-pe3fr]

MLNDR oh I know I’ve been part of CarThrottle since 2015 but this type of video is newer and donut has been doing these for a bit longer and they’re better.

[@mlndr8551]

David Cammaerts really? Ok im wrong u r right because I thought Car Throttle did this for longer

[@edeggermont]

I hate back pressure. That is why I mounted a fan at the end of my exhaust

[@kutayarcan911]

Isn't that kinda harsh on the muffler bearings tho?

[@edeggermont]

Yeah, I don't like them either

[@Dan23_7]

I fit an owl in my exhaust, hoots when I change gear letting me know it's happy

[@ianpalopa3328]

@@edeggermont LOL

[@TomohawkLOL]

Ilost all interest in carthrottle a while ago and these half assed videos were the final nail in the coffin. The exhaust back pressure was implemented back in the day to prevent exhaust valves from getting burned as the fuel octane was much lower. A higher pressure increases the required temperature for unburnt gasses to ignite, thus lowering the probability of combustion occurring in the exhaust system (primarily in the headers and around exhaust valves) which theoretically lengthens the lifespan of the engine as it prevents valves from getting burned. This theory was dropped off when fuel octane ratings shot up, and is no longer required with typical octane ratings of over 90. The myth about the exhaust back pressure being a must for a proper operation of an engine is something that just carried over the years without its core purpose being explained and now everyone who "thinks" they have a clue as to how an engine operates yell out that exhaust back pressure is required for any engine with nothing to back up their saying. This video also completely ignores the exhaust resonance factor, something that can play a major role in top end torque gains (why torque and not horse power you ask? well because horsepower does nothing in terms of moving a vehicle, it indicates power output as in if you hooked up a generator to the flywheel and run the engine at its peak hp rpm. torque is what creates motion) . Stuff like this just makes me feel bad, because a huge car oriented community is puking out half assed junk without proper explanation or any backup to their theory. At least do some proper research or get someone with proper engineering background (someone with experience, not a book worm) and let them write the script or host such videos.

[@Dan23_7]

Gilligum I was just going to say this 👏🏼👏🏼 Honestly 😜

[@unclejoeoakland]

Gilligum make the video. Seriously. This video is a gross simplification and not a good one. Please do this.

[@TomohawkLOL]

I would love to, but I don't have the required set of skills or equipment. As in I don't know how to animate anything at all and I don't have any decent audio recording hardware. Besides, back in the day (3 or 4 years ago) I made some posts with very detailed explanations of several engine components (intake resonance, stuff related to engine temperature, torque vs hp and more) but the feedback was simply not there which made my work pointless for me. I suspect that even if I start doing such stuff again, lets say in forms of articles, I'd give up 1 or 2 articles in as it gets repetitive for me

[@unclejoeoakland]

Gilligum a loss for the rest of us.

[@yannickbreunesse327]

Gilligum im not going to read this paragraph sorry

[@dwarfrex]

Unless you have a 2-stroke engine, of course.

[@shaggy03wrx]

dwarfrex or a Subaru with unequal length headers.

[@Paul7mac]

dwarfrex yep this is probably the not so well informed getting all sorts of motors mixed up. Which goes to the even less informed as gospel and then becomes accepted by the general public as fact.

[@4x4ManiacBadTimeGarage]

so? where is the myth?

[@zachmiller9175]

TommyVercettiKing that bigger exhaust always kills torque, when it's really only when you go too big and create turbulence and low velocity

[@4x4ManiacBadTimeGarage]

thanks

[@numinous4789]

You weren't listening - he debunked the myth that backpressure is the primary consideration - it isn't. That's why so many people get confused regarding this, from an engineering standpoint.

[@danparaschivoiu8620]

thedog556 but if you increase the pressure in turbo (if it has one) it will be benefic a bigger exhaust diameter and make more HP

[@eriv4735]

thedog556 that is completely false

[@EppingForest304]

What a hopeless explanation... Think I'll stick with "Engineering Explained" Channel for technical car information

[@this-is-big-john]

EppingForest304 or Donut Media

[@atlan52]

It may have been a myth when all cars used carburetors before EFI came in. Some oxygen sensors (mostly zirconia narrow band sensors) are affected by exhaust pressure and will give incorrect readings if pressures are too low or too high. This will in turn affect the engine management routine to incorrectly compensate fuel to air ratios for a given load. This may result in poor performance across the entire RPM band, not just the low end. There are procedures to monitor back pressure when diagnosing poor fuel economy and performance. Calling it a myth is inaccurate at best.

[@WhoThisGuy515]

true but if you change the intake or exhaust system, you should get a tune regardless and that will fix those issues.

[@numinous4789]

This vid is on-point and gets right to the heart of the matter. As a tuner, I've seen the practical application of various setups prove this true. On my personal car, a Speed 3 tuned for 390/380 @ the wheels, I went with a full 3" exhaust. This is the sweet spot for my power range, flowing enough to not choke power, but not being too large to slow down exhaust gas velocity. Scavenging is also the reason why EL headers perform better (although UEL usually sound better - think of how a Suby STI sound (UEL) vs. a Civic Si (EL)). The characteristic burble goes along with different cylinders having different exhaust path lengths through the exhaust manifold.

[@Papa7Bravo]

The easiest way to explain why backpressure is a myth is explaining about breathing through a tube, a really thin tube you have to work to be able to push air through it, you won't be able to do it all day, however, a large tube you can breathe much easier but if it is a long tube then you'll find that the gas you exhale doesn't come out the end quickly, if you were to breathe out many times a second it'll create backpressure due to the lack of velocity and again the engine has to work to push the gas out. Now all your power is going to be from header design, the right size is to create an efficient velocity where the diameter isn't so small that the engine has to work to breath, but with the headers each exhaust pulse should all meet in a way that it causes negative pressure ie a vacuum in the other tubes which will aid the engine to draw the exhaust gas out of the combustion chamber with the least effort, meaning less power is used to expel the gasses. Backpressure is a myth, header design is where the power is made.

[@clubalbert]

There's a Myth going around that if you have less oil in your engine your crankshaft will spend more freely dust giving you more power.

[@mustangrt8866]

yeah, and motor oil gets better overtime

[@edgargarzaarizpe195]

Already covered by Engineering Explained, back pressure is confused with negative scavenging or pulses bouncing back due to changes in the cross section area of the exhaust (resonators, mufflers, yxh pipes etc.). The less restrictive the better but always tune your ecu :)

[@jfdb59]

Which topics do we want you to cover in the future? Well I’d say none of because this video sucked and you didn’t even cover this topic. Great job!

[@9.1416]

How to tell whether a tires puncture or not..and about maintaining correct tire pressure…

[@wordreet]

When I rolling-road tested my, full length stainless system, 2.5ltr Vauxhall Cavalier, I had some tail pipe baffles to keep it quiet. During the RR tests, the baffles were removed and the car showed 12bhp less than before.

[@MrJdsenior]

Absolutely can happen. I have seen port modifications in heads that were absolutely gorgeous and wouldn't flow diddly, and ones that were done on a flow bench (by someone who had spent LOTS of time learning what works and what doesn't) and looked like hell warmed over that would flow like the Amazon (exaggerating obviously, but you get the drift). People always want to make complicated things into yes/no answers. Almost always total crap when they do, unless it IS a yes/no question. This topic is not, not remotely. I've also seen heads done by early engineers (say the 70's) that you could actually hear the air flow FLUTTERING in. Not good. One fix was actually ADDING material around the valve opening (that's bad).

[@parvariramin]

‏Thanks for the great video, I put a gasket on the connection between the muffler and the exhaust pipe for a better sound. It can be said that this part of the exhaust is leaking now, will it damage the car engine in the long run or not?

[@AuMechanic]

Gas velocity theory or Kadenacy effect is a theory of the 1930's that was dead the moment transducers were invented by the 60s, only scavenging that occurs from exhaust is during blow down period and limited entirely to the cylinder and not the exhaust or header. That is the reason the exhaust valve is opened before BDC, the out rush of exhaust under pressure reduces pumping losses but it ends there. Any effects of the exhaust is entirely wave scavenging effect and nothing to do with gas velocity. The effect of back pressure is a means to broaden the initial compression sonic wave that travels down the exhaust and returns an expansion wave and as such widens the wave scavenging effect over a greater RPM range at the expense of peak. Thus simply closing over the far end of the exhaust will reduce peak but increase mid range, some motor cycle engines simply use a flap to do just that at low throttle and engine speeds. If the velocity theory was valid that flap control at the far end of the pipe would simply not work, but it does.

[@christianguzman8228]

I get what you're saying. Large Diameter + Short Running Length is what I need! Get the longest header tube length you can with the largest diameters and then dump them behind the tire with a somewhat downward turned pipe facing out. Where does this myth come from? Guy with V8: I want to cut off my cat[ylitic converter] Guy with V6: No dude, you need that back pressure. Truth: Your engine will notice the lack of a catalytic converter and increased flow and tune itself back to comply with its own emissions programming. What exhaust scavenging is at low RPM An area of high pressure followed by an area of low pressure (NOT A VACUUM). Unless you're popping out the books and calculators, checking the density of the atmosphere in your area, calculating exhaust volumes at a range of RPM's and figuring the best proportions of distance and diameter, there's almost no reason to care about exhaust scavenging. If exhaust scavenging was really that important to a car manufacturer, collectors would be placed at the end of a exhaust, not right after they come out of the engine. Hypercars and some supercars do this. Some people can't even answer how much exhaust comes out from one revolution in their car. I don't like this oversimplification of a complicated and very unnecessary topic.

[@GlassTopRX7]

Exhaust scavenging is a big deal to manufactures. It's typically tuned for cruising rpm for fuel economy on most production cars. For max performance it's tuned for power at whatever rpm that happens at. The length determines the RPM it's most effective at, you wouldn't just put it at the end as it has to be tuned so the pressure wave hits while the valve is open at the rev range you are targeting suck the gases out. The pressure wave moves at the speed of sound so length determine how long it will take so it's fixed to a rather narrow rpm range.

[@No-ph6tc]

Being new to standard and a perfectionist it would be really cool if you guys could do a little video specifically about rubbing and riding the clutch and how to avoid clutch wear, and just little bad habits in general. I know the basics of what not to do but there are some specific scenarios i feel exist that I dont know too much about

[@MrJdsenior]

Yup, like rub the ever living hell out of it if you are trying to hole shot a non traction limited car. Oh, and BTW, 'perfection' is a COMPLETELY unobtainable goal, not even remotely a 'thing'. Just sayin'. If you REALLY want to minimize clutch wear always match RPM 'exactly' with what it will be when the clutch is released in any up or down shift, and slip the least (energy wise) when starting out, making sure that the clutch is fully engaged when idle velocity in first gear is reached. Driving for minimum clutch wear, and enjoyment and function are two different things, unless you are just totally anal about one to the exclusion of everything else, then have at it. :-) And then if you want to get fancy, learn what and how to gain high proficiency at double clutching, not really of any use, but looks and sounds really cool (to some at least). Yes, this is mostly smart ass, and intended as a joke, not a diss, hope you enjoyed it. :-) And your question is reasonable and deserved a real answer, and tidbits of that are hidden within.

[@wesleycollins9547]

How can you tell what diameter exhaust does your car need

[@RellTheDriver]

The different between stock intake, cold air intake, and hot air intake!!

[@MachineElf]

Its always been my belief that the inlet valve starts to open before the piston reaches tdc on the exhaust stroke and momentarily both valves are open together, valve overlap, the exiting exhaust gas creates a vacuum behind it which draws the fresh charge in and because the piston is at the top its drawn into the exhaust pipe, the posiitve pressure wave coming back up the pipe caused by a restriction, back pressure, stuffs that unburned fuel back into the cylinder just before the exhaust vave closes incresasing the charge in the cylinder and giving you a bigger bang. No back pressure = unburned fuel in your exhaust pipe or am I completely wrong ??

[@SwampCityRadio1974]

I think the explanation of pressure, back pressure at different points in the system, valves, scavenging, exhaust velocity, the behaviour of pressure waves at different revs etc needs to be so nuanced, that it is possible most people are all correctly describing part of the process but failing to capture the whole picture with sufficient nuance. I think often, we're all mostly correct in what we're saying but slightly wrong at the same time. It's like a bunch of people all describing different parts of the elephant correctly. Some see the tail, some see the foot, some see a trunk. None of them are wrong but none are correctly seeing the complete elephant. It's possibly to make correct statements about exhaust back pressure but they're statements that need further qualification, often endlessly so, so that making a simple/simpistic statement about exhaust back pressure can never quite capture the whole picture.

[@mediocre-motorcycle-modifi6818]

On a diesel you can lose 10% of the power because of back pressure. To calculate power loss it's just pressure x volume flow.

[@Chevylaluz]

Congratulations you completely missed the target

[@Quetzalcoatl0]

So that's why those drag honda exhausts end right after the turbo and through the front hood. You won't have turbulence, won't have back pressure or everything else said in this video.

[@Wownerd1265]

I think "back pressure" is such a pervasive myth because, while the explanation of the myth is usually nonsense, the predictions made based on the myth do frequently line up with those made from a more accurate understanding of the fluid dynamics in an exhaust pipe. Even if the model is technically incorrect, its hard to convince people not to follow it when it usually works okay-ish.

[@extrabass287]

it's kind of simple if u just want the car to sound good for the cannon exhaust, for example, a 4" or a 3.5" if you are looking for performance for high-end times or lap record maybe you should consider more this like you're ECU, manifold, exhaust made spicficaly for you're car

[@abdulwafi2634]

That's why OEM system always the best. If your upgrade inside the engine. Then , it should be Considered necessary to change it

[@maisunmonowar]

I'll believe you when Jason tells me the same thing

[@Maxumized]

Duh…Exhaust velocity+Scavenging create or diminish back pressure relative to both. Physics, physics, physics He’s saying eating apples and oranges are more important than eating fruit

[@echtraymond7300]

What if we cut the exhaust?

[@kustom13rods]

Your supposed to be TEACHING!!! WTF!!

[@aamirfatehi5426]

Background music name? Please?

[@lm7bird680]

What if i put a turbo to suck out the exhaust gases

[@Awesomeman1987]

If you have ever cut the exhaust off in your younger years you will realize that 100% of the time you will lose your bottom end. Even a straight pipe setup loses torque, but inversely you gain a bit up top

[@evildax6815]

That's 100 percent bullshit. I deleted my muffler and two resonators and added straight pipes to where both reasonators were. I wielded a larger diamater pipe to where the muffler used to be and actually retained my high end and low end. I can pick up low end faster than I did with all those variables on

[@Awesomeman1987]

@@evildax6815 Not a large enough change in flow to make a noticeable difference. Unbolt your exhaust directly behind your manifold. If you don't have cats in the manifold you engine will fall on its face in the low end. There are plenty of engineering concepts that support this phenomenon. It's the same reason we have variable length intakes (long and thin for low end performance, short and wide for high end performance) I also speculate you only think its faster up top because it's louder. Most times stock exhaust is optimized well for then engine and you don't pick up any power by putting a bigger exhaust on it. The only way to be sure is to dyno it before and after any swap.

[@evildax6815]

@@Awesomeman1987 I made a video of me going 0-60 before and after. I am about 2 seconds faster after than before. I did Hill starts by the way on both tests. I have a 2010 ford focus 5 speed Coupe. I also go close to the redline for each gear during each test

[@MuhdIqbal]

1:30 is that in Malaysia?

[@azyumardich.4440]

Plz do "how to wheelie" next

[@nickamarit]

Please do the myth about oiled air filters ruining MAFs.

[@j2dreamerforternity]

okay. but now explain why. and is it good to do it or not.

[@MysterD515]

It is all about volumetric efficiency. Look it up.

[@ThePCRetard]

Why is my dirt bike easier to wheelie with the exhaust baffle in if back pressure is bad?

[@mediocre-motorcycle-modifi6818]

2 stroke scavenging is massively affected by back pressure, it can reduce or increase power.

[@outcome2715]

back pressure isn’t a myth , 500 pounds of pressure against your cylinder that get multiplied quite a bit as the piston extends up the shaft… making a loss in power simply cause your car has to work harder in the cylinder. but as far as the right amount of back pressure etc and if it greatly effects anything no it doesn’t greatly effect much at all unless your at the drag strip every friday with your car 😂

[@marshallmcaleer89]

Velocity and turbulence are affected by back pressure, if there is too little you will have less Velocity and less scavenging..

[@kevinallen4075]

So basically we should all put 1in kazoo pipes on our exhaust. Cool

[@christopher7072]

Do a speed wobble info video.

[@MrKngdali]

Dude you said noting

[@niacal4nia]

You must have read David Vizard article.

[@Dan23_7]

I learned sweet FA off that 😂

[@cyjan3k823]

Isnt velocity of gases connected to pressure? Also if it flows faster scavenging should be better?

[@GlassTopRX7]

No, because exhaust scavenging is based on the shock wave created when the runner opens into the collector. That shock wave is a negative pressure wave moving at the speed of sound regardless of the flow rate. What does matter is the distance it has to travel which effects the timing of when it arrives. That's why exhaust scavenging has to be tuned to the engine for an ideal rpm range. In most cars it's tuned for economy but it can be tuned for performance as well.

[@jOoomOooo]

so you have mass flow rate and if you have a large pipe or a small the velocity of the flow with compensate by moving faster or slower bc its moving the same amount of air (as stated by nander) but like velocity is inversly proportional to pressure so slow has high pressure and fast has low pressure but also if the tube are too big the flow will be un organized, turbulent flow that gets in the next pulse

[@RockabillyRambler]

Rewind to mighty car mods making more power with a potato in the exhaust.

[@upsidedowndog1256]

Poor header design with too small a collector like "shorties" hurt power everywhere. Removing tailpipes and installing "dumps" have helped my cars everywhere.

[@salmanhisham5155]

Exhaust headers pls

[@raymondguzman5083]

Lmao engine masters begs to differ becuase the actual tested this on an engine dyno and it only negatively effects smaller displacement engines that acual benefit from a 2.5 inch exhaust and a 3 inch exhaust is better for bigger displacement engines

[@raymondguzman5083]

Lols i just read this and ive come to the conclusion that I indeed do not know how to sentence

[@TDG2654]

Raymond Guzman yes, that is correct.

[@_JayRamsey_]

Raymond Guzman If you rewatch that episode you'll notice that the gains were somewhere above 5kRPM, and IIRC the 2.5" slightly out-performed the 3" at low RPM. So if you spend all of your time with your engine screaming, then 3" is better. An older stock V8 with a factory economy cam isn't likely to even rev past 5.5kRPM, and definitely won't make power up there. But even if it did, do you have the engine in your daily wound out like that the majority of the time? That's the deciding factor, I suppose.

[@buddydjango]

Engine dynos are also at wide open throttle the entire time no part throttle

[@GatisGirdenis]

Jay Ramsey why is it about "WiLl YoU rEv YoUr EnGiNe LiKe ThAt AlL tHe TiMe?". Slightly sick of this question as well as the statement "you NEEEED!!! back pressure", they even teach it in mechanic schools here! But what I havent seen mentioned is actually the primary and secondary header pipe length effects. It's not like those are what ACTUALLY change something. The scavenging point is most affected by this. The shorter the header pipes (or bigger), the higher in the range the effect occurs (if you ever even attempt making a header by yourself, you should get the size for your engine first, and then size the length accordingly, plenty of math and/or software for it). The exhaust diameter alone doesnt do much, just frees up the top rev range (if your headers allow it). Also, no pressure waves mentioned, which also have quite a decent effect on the exhaust efficiency.

[@user-vs7sb9wg2r]

Talk about turbo lag and boost threshold.

[@henriklassen3435]

Did you just say that you get incresed turbulance with a lager diameter?

[@ilpatongi]

Yes

[@henriklassen3435]

@@ilpatongi I am pretty sure that it is that other way around

[@ilpatongi]

@@henriklassen3435 I'm pretty sure it's not. A bigger diameter with the engine that outputs the same air CFM means a less focused flow and less overall pressure.

[@slackin_2423]

SKATE 4 PLEASE!!!!!!!!!! START THE MOVEMENT!!!!!!!

[@johnsmovies5523]

ramchargers?

[@rbr7li]

so? what then?

[@jj_k24]

I have a Honda k24 motor and when I removed the muffler I noticed a significant decrease in low end torque and I would have to press down harder on the gas especially in 6th gear. I put the muffler back on and the car accelerated faster. Modern engines are designed with back pressure in mind so if you decide to remove the muffler or buy an aftermarket muffler then make sure you re-tune the ecu.

[@samimasood3954]

You used the mighty car mods 240z

[@ItsLuxxeh]

Not a myth. My 350 wouldn’t spin for shit with open headers. As soon as I got true duals she woke right up and the power and torque is there.

[@ilpatongi]

He literally explained you why...

[@thedarkpototoy3642]

Muffler deleted my E36 when I first got it for sound purposes. Lost torque and gained a little up top according to my butt dyno.

[@developmentdivision122]

0:14 MCM s30 !!

[@rinorm7709]

guys lemme tell you, if your car's engine is powerful you need less packpressure than a weaker one, backpressure is the same stuff as blowing into a small juice brick pipe and a alumium paper tube

[@Yanudibraim7111]

I have a 4.3 chevy blazer.. Can i straight pipe it?

[@rinorm7709]

@@Yanudibraim7111 it depends on your muffler or how and when you feel the power, if you feel torque at lower rpm (under 3-4k rpm) leave the exhaust as it is but concentrate more on cold air, then if you don't feel torque try to change the muffler or adapt the exhaust system to create a little bit of backpressure to create a little more torque, hope it helped and i hope i got the good explanations (sorry for my bad english)

[@GoldenGrenadier]

So people buying smaller exhaust systems to increase back pressure are actually accidentally achieving more torque?

[@WhoThisGuy515]

They aren't gaining torque, but to an extent simply moving the torque curve lower in the rpm range. Doing this though severely hampers the amount of HP the car can make.

[@GoldenGrenadier]

Thanks for the clarification. I guess it produces the illusion of more horsepower upon acceleration.

[@epicon6]

This video ended half way.

[@FedericoLucchi]

Nice video, however Engineering Explained's version on this was more complete.

[@MrJdsenior]

Really, the engineers that design exhaust, etc. vehicle power systems for street/racing/etc. (or at least people that read and try to understand their findings/design methodology, etc) know more about this sort of thing than some KZbin yes/no answer guy??? SHOCKING! :-)

[@Phillguy]

You still don't explain why you might need back pressure

[@barney9008]

Is that it????

[@zacks240sx]

*velocity*

[@maxd6663]

Back pressure is very important! You loose all the low end torque and it really ruins efficiency of a daily driver car and not so noticeable on race cars as they go high revs all the time. It feels the most if you go straight piped with no mufflers. One time I literally had to put muffler back on my straight piped Jetta VR6 because it became similar to turbo lag. Bad feeling on N/A car.

[@julianzamarchi7828]

So we know its not a myth, you just wanted to get technical.

[@ianham9876]

Spacers

[@rohankulkarnii]

I want a video about COMMON RAIL IGNITION SYSTEM and other ignition system! 😍

[@MultiHunterOne]

ROHAN KULKARNI Common rail is a fuel system and not an ignition system.

[@rohankulkarnii]

Hunter Falkner Oh..Thanks!😊

[@kyle9933]

Well you didn’t cover any topics in this video except “people think that” and it’s just what you think

[@abhineethaalthoor]

Hello

[@mikelli4544]

"Velocity is the speed" Nani

[@ThaDutchDK1989]

exhaust backpressure is not only for scavaging exhaust gasses but 2 to pull fresh mixture in to the engine with the valve overlay.. they did forgot to say that.

[@LK-nu6mg]

You completely lost me on this one.

[@yunusashtijou3187]

? huh?

[@LOL-ij8yq]

Physics.... WTF.. Are we in tje school 😲😲😲😲😲😲😲😲NOOOOOOOOOOOOOOOOOO!!!

[@rayZeFaraH]

Straight pipe all the way :p

[@jakewoods1503]

What

[@darrellsomers5427]

It's not a myth

[@rong4189]

Yeah, you definitely want back pressure. The race cars with open headers have been doing it all wrong for decades . . . .

[@Nightdare]

You do know that Race cars are all about High RPM power

[@jOoomOooo]

you dont want back pressure

[@janiyanethmaweerasinghe512]

54 th comment

[@SimonElenor]

Wrong! Look up valve overlap and learn it.

[@pustekuchen8956]

1:29 ricers gona rice

[@bmadrigal99]

Arcadic Dream Those are cars made from bosozoku/ Shakotan style originating from japan.

[@AbsoluteEmperor]

Arcadic Dream Pls stop misusing that word.

[@nuffelbagget9173]

Isaiah Sampson well one thing I think we can agree on is that both of them look absolutely fucking stupid

[@AbsoluteEmperor]

Nuffel Bagget Nope.

[@MrCalvin2kill]

This video didnt explain anything

[@abscor3879]

Still no answer to the question, thanks for nothing

[@TheDealer6373]

This is why I unsubscribed from CT.

[@thematurbo240]

Waste of time.

[@jacobhoke581]

These videos are starting to get pretty shity ICN done subscription coming soon

[@iea96]

Different narrator but it's still terrible

[@kaposvaribando1277]

i like him

[@7inviere]

Yeah i like him too, dunno why you hate him lol. Adam gayet güzel anlatıyor bir sorun göremedim ben.

[@joeslater842]

Watch something else then

[@dasovietpotato3784]

If you dont like it then go back to hating pewdiepie.

[@claudiuradu7681]

If you were to die today are you 100% sure you can go to heaven?. So, you must realize that you sinned against a holy God and God has to punish sin with hell forever( And the devil that deceived them was cast into the lake of fire and brimstone, where the beast and the false prophet [are], and shall be tormented day and night for ever and ever) . But, you can put all your faith,trust from the heart in the death, burial and ressurection of Jesus Christ(1 Corinthians 15:1-4 - Moreover, brethren, I declare unto you the gospel which I preached unto you, which also ye have received, and wherein ye stand; By which also ye are saved, if ye keep in memory what I preached unto you, unless ye have believed in vain. For I delivered unto you first of all that which I also received, how that Christ died for our sins according to the scriptures; And that he was buried, and that he rose again the third day according to the scriptures), in Jesus Christ sheed blood for the forgiving of sins(Romans 5:9 - Much more then, being now justified by his blood, we shall be saved from wrath through him. ). Ephesians 2:8-9 For by grace are ye saved through faith; and that not of yourselves: it is the gift of God/ Not of works, lest any man should boast. You don't have to do anything to get to heaven, no work, just trust, rely on what Jesus Christ did for your salvation. Now if you put your trust in what Jesus did, you are going to heaven no mather what, have eternal security(Ephesians 4:30). Now of course grace is not a excuse to sin( Romans 6:1-2 What shall we say then? Shall we continue in sin, that grace may abound? God forbid. How shall we, that are dead to sin, live any longer therein?), after death going to heaven or not you will face judgement. If saved, you will go to The Judgement Seat of Christ where your works you do after being saved are judged for rewards there.Also out of a good conscience we must not bother God by sinning because he died for us to be saved.

[@moeezahmedshahaab]

This video is beautifully done. Love the visuals they really help. Easily one of my favourite type of videos on KZbin Great work guys keep it up

[@zebharris3806]

Engineering Explained did it better

[@abdulazeez.98]

Please do more of these videos. They are really helpful.

[@abdulazeez.98]

Carlos MMV Yes that's true, the video was really short. They should've explained it more. But it's nice to address such topics.

[@JodyBruchon]

You have decent video production skills, but you never directly addressed "The Back Pressure Myth." You talked about the concepts that are related to it, but you never actually cleared anything up.

[@DavidPalmer_planeace222]

Electric cars and the future of car racing and car culture.

[@shanedavis2578]

David Palmer it will get so much more exspensive

[@DavidPalmer_planeace222]

Shane Davis not if it becomes mainstream. It was the same thing with ICE cars in the beginning. As a matter of fact, there was a time when electric cars were more popular than gasoline ones. It's the industry and politics that changed this stuff, and now we are late to the party.

[@shanedavis2578]

David Palmer idk if that'll hold true, but regardless I'll cling to good old dinosaur burning engines like the stubborn bastard I am

[@DavidPalmer_planeace222]

Shane Davis Lol. It is what it is. But there is a lot of potential with electric drivetrains. Instant torque, no fumes, whiplash to the max and some sound like freaking spaceships! Im honestly ready for this. We just need to get people of greater power off the oil industry and look into something that's more sustainable. You know what I mean? Granted, I'm no environmentalist, but I definitely don't want to melt the ice caps, make sea levels rise, and mess up the planet because we were so addicted to a resource that takes millions of years to replenish, and is dirty. Perhaps I am an environmentalist... But that's besides the point. I'm ready for another revolution.

[@RobBroderick44]

David Palmer Said no one ever. Jk it's cool but nowhere near ready.