Any Formula 1 Engineers on here?

[Huckleberry]

From an engineering standpoint with the downpipe at a fixed diameter and controlling the initial flow into the exhaust system, why is there any gain by splitting into 2 larger pipe diameters? Q=AV right, and continuity principles apply do they not?

I could take my garden hose and run it into 2 large culverts, but I don't think it gets me anywhere.

I can see reduction in friction losses, but can't believe that is a huge deal in such a short run such as this exhaust is. Isn't this a "well it looks cool thing"?

So, I am as guilty as the next guy of doing things for looks (and sound) - why not, its fun and otherwise we would still all be driving '65 Ford Falcons.

But curious what the pipe flow engineers have to say.....

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[Extreme Power House]

I'd be very impressed with this forum if there is a Formula 1 engineer on here

 

[MisterSkiz]

Are you asking why we have two exhaust exits on our car? Probably because it looks cool.

I have been on different forums with many folks who were super technical and some of the things that I have learned about exhaust and gas flow stuff is that things that make sense to us and seem obvious do not adhere to how they really behave.

You could look at a pipe and go "well that doesn't work well" but until you get it on a flow bench you can't really say that.

Part of the shape and sizing of exhaust tubing does have to do with packaging, but it also has to do with sound and flow. Too big of a pipe and you cool down the gas and it does not have the pressure to flow out of the exhaust, etc

Then you have differences with engine types (inline 6, vs V8, vs turbo, versus NA) and firing order, etc

https://burnsstainless.com/blogs/articles-1/exhaust-header-theory

https://www.musclecardiy.com/performance/exhaust-system-component-design-flow-and-function/

 

[H2O_Doc]

I'd be very impressed with this forum if there is a Formula 1 engineer on here

I’ll say that if anyone ever needs help with your pet fish, I’m your guy. Sure, an automotive engineer MIGHT be useful on a car forum, but let’s not forget the importance goldfish and bass.

 

[Huckleberry]

So, it was a bit tongue in cheek about "Formula 1 Engineers", really don't expect that, they are too busy trying to figure out how to beat Mercedes....

My theory is this - the 2 pipes look cool, but if I want to aftermarket upgrade, I think a single 3" ish pipe back to the muffler system would work just as well if not better in terms of gas flow pressures, etc.. And you get....

• Simpler installation
• lighter weight (1 pipe weighs less than 2)
• less expensive in theory (1 pipe should cost less than 2)
• the same look provided you go into a dual exit strategy

Like this for example: https://www.a90shop.com/product-page/afe-takeda-3-to-2-5-304-stainless-catback-exhaust-mkv-supra

Not sure how it sounds, but I like the approach.

 

[MisterSkiz]

So, it was a bit tongue in cheek about "Formula 1 Engineers", really don't expect that, they are too busy trying to figure out how to beat Mercedes....

My theory is this - the 2 pipes look cool, but if I want to aftermarket upgrade, I think a single 3" ish pipe back to the muffler system would work just as well if not better in terms of gas flow pressures, etc.. And you get....

• Simpler installation
• lighter weight (1 pipe weighs less than 2)
• less expensive in theory (1 pipe should cost less than 2)
• the same look provided you go into a dual exit strategy

Like this for example: https://www.a90shop.com/product-page/afe-takeda-3-to-2-5-304-stainless-catback-exhaust-mkv-supra

Not sure how it sounds, but I like the approach.

What would be really cool is if a company sold a single pipe exhaust (they do) AND a new rear diffuser that covers up the empty hole (they dont - not that i have seen at least)

 

[XtremeMaC]

I've never worked on Exhausts and unless someone can convince me exhausts will be needed in electric cars in the future ? I'm not going to, but I can tell you that usually it's engine backpressure/heat/etc., packaging, and aftertreatment related, however in Supra's case, unless Sport button magically gives 1000 more hp that we don't know about and drastically increases HC, CO2, NOx, 2nd pipe is there just to silence it and who knows maybe conform to noise regulations (don't know how that'd fly) and mainly aesthetic reasons..

I like the aesthetics and not a hardcore I want a 6s car, thus I wouldn't care about few pounds here and there, but if you are looking to save weight, then I'd say there are no other drawbacks with a single 3-3.5 because one can drive 100% on normal mode with pops/bangs and flap disabled.
If you're looking to go 4-5" (don't know how you'd package it), the scenario may be different, just like straight piping the whole thing..
Don't know how slower flow with 4-5" would affect emissions and whatnot.

 

[Huckleberry]

Correct - Electric cars don't need exhausts because the coal and gas fired plants that supply the electricity have that handled already via smokestacks.....

 

[Lendo]

I sometimes identify as an engineer at the bar to impress people. Little do they know that I work in finance and have no clue about what I espouse

 

[MyCorolla]

This might help with understanding exhaust back pressure:



You could always submit a suggestion:

http://www.howdoesacarwork.com/p/video-suggestions.html

 

[Extreme Power House]

I’ll say that if anyone ever needs help with your pet fish, I’m your guy. Sure, an automotive engineer MIGHT be useful on a car forum, but let’s not forget the importance goldfish and bass.

 

[Dannyvandelft]

I'd be very impressed with this forum if there is a Formula 1 engineer on here

Didn't you know? Adrian Newey drives a Supra for research purposes for the Valkyrie

 

[Extreme Power House]

Didn't you know? Adrian Newey drives a Supra for research purposes for the Valkyrie

 

[digicidal]

Didn't you know? Adrian Newey drives a Supra for research purposes for the Valkyrie

... Because they're finally considering adding some fake vents? We all know those make everything faster.

 

[Dannyvandelft]

... Because they're finally considering adding some fake vents? We all know those make everything faster.

It was either that, or stickers ?

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