| How do turbo & NA exhaust requirements differ? - Click HERE for Original Thread |
| 91laserrs |
| can I assume that a turbo'd car would need to push more exaust then an n/a? |
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| eclipse.soul |
| as far as i know...Yes. |
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| 6gcelly |
| If you are asking if a turbo car would benefit from larger exhaust then yes. For 2 reasons. In order for the turbo charger to be most efficient it needs to expel exhaust gases with little restriction. There will also be more gases created by the larger explosion taking place due to the more air it is feeding and the more fuel that will be required to mix with that air. N/A cars generally benefit from a little bit of back pressure(restriction). For a turbo the easier you can move exhaust through it the faster it will spool and the more air it will be able to push. |
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| Prudz_lude |
| Correct, putting a 3inch exhaust on a honda will not benefit it, if anything you are reducing the chance of any performance gains if your honda is N/A. I am using honda as an example i know you don't drive on. Most people going n/a optomize power by using 2.25 or 2.5 exhausts to create a better back pressure in the exhaust |
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| 91laserrs |
ok thats what I thought now what if a guy has a factory turbo upgraded would he also not want/need to move more exaust?
Say like moving from 14b to a big 16g? |
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| NYGACR |
I picked up 9 peak whp and 14 peak wtq and more than 25 midrange wtq by switching from 2.25" to 3" piping on my NA setup. To be fair the 2.25" system had a muffler on it and my setup is more than your typical boltons. Regardless, the 3" exhaust didn't seem to hurt things one bit. I run an open collector at the track.
In my opinion, provided you have a well designed header (with a merge collector), you've got nothing to lose going bigger. However, 90% of headers out there don't have optimized designs- costs are cut and good collectors are first to go, so you may have little (or even no) benefit in going to big piping. Still, I have yet to see a chart showing a loss in power (that isn't from anymore than a shift in AFR) from larger piping. |
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| b18c5crx |
quote:
Originally posted by Prudz_lude
Correct, putting a 3inch exhaust on a honda will not benefit it, if anything you are reducing the chance of any performance gains if your honda is N/A. I am using honda as an example i know you don't drive on. Most people going n/a optomize power by using 2.25 or 2.5 exhausts to create a better back pressure in the exhaust
back pressure would make you lose hp and tq.
you need exhaust velocity to gain tq.
anyways k20a guys are now runing 3 inch pipes na. |
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| kornsined |
I'd say it's dependent on the mods you do. If you got major n/a work done then a 3" is beneficial. Basic bolt ons would not see any gains of good use unless your hitting high rpms all time.
It comes down to how much air/fuel your pumping into the engine. The more it breaths the more it needs to expel. |
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| Fazda |
| when i have my mx6 and i put the 2,5" on with no cat i lost alot of back pressure, my turbo spooled up so fast, and i actually gained about 2 psi as a result of less back pressure it was awesome until i blew a head gasket. twice lol |
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| kevito_ |
Because a turbocharger forces more air into the engine, you will be using more air and fuel. More air and fuel means more exhaust gases.
The overall design between a turbo and a naturally aspirated exhaust are quite extensive, due to the nature of the turbochargers form and function. You might want to ask yourself more detailed questions along your first query if you are planning any sort of turbo setup.
PS: If your not using more fuel with a turbocharger, you better check to see how much engine block you have left ;) |
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| Alberta_Daytona |
turbo - bigger is better.
It is a constant flow...there is massive pressure in the exhaust manifold and it releases constantly though the turbine housing on the turbo...It is continuous.....obviously the more power the more flow.
On a NA engine the exhaust energy is exited in pulses. After every "pulse" of exhaust energy (1 cylinders release of exhaust pressure all the way through the exhaust) there is a vacuum effect...Kinda like waving your arm really fast and having air behind it get sucked in.
This kind of deal is easier to see when applied in liquid (IE moving your hand throug water). Ideally the exhaust size would be sized to benifit most by using this vacuum effect right until the next burst of exhaust energy comes......If its overly big....the vacuum will be gone instantly.
There are entire books on this and the math is crazy. |
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| kevito_ |
quote:
Originally posted by Alberta_Daytona
There are entire books on this and the math is crazy.
Yeah... fluid dynamics and non-linear flow analysis.
More than enough physics, math, and research to work on a PhD and study over an academic career. |
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