exhaust diameter
exhaust diameter
I'm racing an S13 3 valve in SCCA and was looking for some input as to what exhaust pipe diameter to use. The original owner put a 3" on it, but I'm wondering if I will pick up some torque if I go with 2.5". It's a NA car and I have less than 500 lift on the cam. Header is custom from HotShot.
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RyanAwesome
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Re: exhaust diameter (jrs)
experiment with a 2.25 and a 2.5 and see which one works better. 3 is definently too big. what is the header collecter diameter?
Re: exhaust diameter (RyanAwesome)
Says who? The only downside of 3" compared to stock is noise... There have been numerous dyno-sheets uploaded on here showing improvements all across the board on ka24de's. And from the #'s ppl were posting up, seems like 3" makes at least the same if not more hp & torque (all across the board again) than 2.5".RyanAwesome wrote:experiment with a 2.25 and a 2.5 and see which one works better. 3 is definently too big. what is the header collecter diameter?
2.25 vs 2.5 vs 3 has been discussed to death... and well, still no "real" solid answer bcs no one feels like spending $200+ at the dyno swapping exhausts in and out and testing... all we can go off is what different n/a ppl test vs stock - and it seems there is no loss of torque/hp w/ either 2.5 or 3.
The amts you are looking @ btwn 3 & 2.5 are mostly neglible in terms of track time. Just all depends on how much you value your ears.
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RyanAwesome
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Re: exhaust diameter (brokeAs240sx)
i never said it was too big for power. id go less than 3 inch for na. i wouldnt want my car to sound obnoxious. but im sure there are some ka's out there that sound good with a 3 inch exhaust. and im sure there are some that are absolutely horrendous
Re: exhaust diameter (RyanAwesome)
Well the first poster only mentioned torque and didn't mention anything about sound, and your didn't specifically mention anything about either... so I was just going off the first post. Sorry that I was mistaken.RyanAwesome wrote:i never said it was too big for power.
Re: exhaust diameter (jrs)
Everyone says 3" is too loud, but a 2.5" with an *** muffler could be just as loud. If you want to spend the money you could make a 3" with 2 nice sized mufflers to quiet it down. Although... I have a 2.5" It's all about how much money you want to spend and if it's worth it to you
I always ask myself, what would Cole Trickle do?
I always ask myself, what would Cole Trickle do?