downpipe question
03-05-2005, 07:04 PM
#1
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downpipe question
Hi, i just bought a Greddy kit and was a bit sad to find out the downpipe looks like it was custom made by someone, well anyways, it measure 1.5" :S
Now, i have some 2.5" mandrel bend tubing here and was wondering how big a difference it would make having a 2.5" downpipe rather then the 1.5". Is 1" gonna give me any noticeable power gains? Oh yeah, btw, catback is 2.5" too
thanks in advance honda masters!
Now, i have some 2.5" mandrel bend tubing here and was wondering how big a difference it would make having a 2.5" downpipe rather then the 1.5". Is 1" gonna give me any noticeable power gains? Oh yeah, btw, catback is 2.5" too
thanks in advance honda masters!
03-05-2005, 07:49 PM
#6
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Re: (FarOutCoupe)
HP gain is hard to tell, but I guarantee your turbo will spool up much, much faster.
We're not just talking another inch of pipe here; it's the area that's important. Going from 1.5" to 2.5" is going from 1.77 in² to 4.9 in²... That's a 277% potential increase in flow!
Even if your wastegate is set at 4 PSI, the difference is that you will make that boost at 2500 RPM instead of 6500 RPM. A major difference.
We're not just talking another inch of pipe here; it's the area that's important. Going from 1.5" to 2.5" is going from 1.77 in² to 4.9 in²... That's a 277% potential increase in flow!
Even if your wastegate is set at 4 PSI, the difference is that you will make that boost at 2500 RPM instead of 6500 RPM. A major difference.
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