Exhaust Size vs HP & TQ
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Exhaust Size vs HP & TQ
Its pretty straight forward what size piping you running and how much Hp & Tq you making? When is 3" to small and 3.5" or 4" needed?
Last edited by 3gEclipseTurbo; Dec 13, 2009 at 02:23 AM.
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Well the prevailing thought on evom is bigger is better....That said, I have not seen a test with 2.5" vs. 3" vs. 3.5" piping. I am guessing most of the benefits with aftermarket setups is from the muffler design (very loud) and /or test pipe. Buschur runs his 3" exhaust on cars with crazy power, so I doubt you need to worry about going larger than 3".
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There is a very mathematical way of determining what size exhaust would be best for a certain power range. There are reason why there are 3" setups all the way to 5". The different exhaust sizes will cause different amounts of back pressure on the turbine wheel of the turbo. In most cases you want to eliminate as much back pressure as possible to have the turbo spool up quicker. But, some level of back pressure is needed to have optimum turbo spool. In big time race cars you will see many pressure sensors located throughout the motor; manifold, pre-intercooler, post-intercooler, exhaust, etc.
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Oh forgot to put that im going for 600whp in the first post. I just got to thinking as ETS has 3",3.5", and 4" turbo backs. Must be a need for bigger than 3" or atleast an atvantage of going bigger.
cssaddictm4, are you gonna post the mathematical why to know what size exhuast to go with or just talk about it, lol.
cssaddictm4, are you gonna post the mathematical why to know what size exhuast to go with or just talk about it, lol.
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If you go 3.5 make sure you have a good pair of ear plugs.
I have the ETS 3.5 and it's loud. But then again my entire car is loud. GT4088 twin scroll with open dumps. So it's not like it's the quietest Evo on the block but I enjoy it.
I have the ETS 3.5 and it's loud. But then again my entire car is loud. GT4088 twin scroll with open dumps. So it's not like it's the quietest Evo on the block but I enjoy it.
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^^^^+1,000,000 AND u want the SHORTEST exhaust possible on a turbo car for maximum power.
OP, there are hundreds of evos making more power than ur goal running a 3" exhaust, but its ur car. do what makes YOU happy, not anyone else
OP, there are hundreds of evos making more power than ur goal running a 3" exhaust, but its ur car. do what makes YOU happy, not anyone else