hatch101

is a 2.25 inch exhaust enough for a turbo SOHC? i know that the 3 inch is recommended, but i have a 2.25 inch right now and i really like it? any imput??

blufke

thats fine. dont worry about it.

turbohonda

It all depends on how much boost/hp you are going to run. With a turbo set up the bigger exhaust the better.

hatch101

well its gonna be just a daily driver so its not gonna run THAT much boost. the max ill run is gonna be like 7-9 psi. oh and its going to be the greddy kit.

mos

CzanSOHC

2 1/4 is perfect for that situation. I have an GReddy EVO thats fits 92-00 civics for sale if you are interested, along w/ a high flow cat. PM if interested.

kommon_sense

This is good to know. I'm only planning 6-8psi on my d16y8 and kept getting the generic "you need a 3in. exhaust" answer. Does anyone have a table with what size exhaust you need to produce X amount of hp?

blufke

a free-er flowing exhaust will help no matter what, it just depends on how much noise you want. the bigger it gets the louder(in general). you would probably free up some whp but not enough to justify the cost at this time is what i would say.

nolimits

Actually that's not necessarily true. With a larger dia/free-er flowing exhaust you generally lose some lower rpm tq/hp and with proper flow gain some top end hp. Too large exhaust will lose the lower power and not gain anything up top.

bretx0r

2 1/2" with a good muffler sounds excellent and the turbo spools quick, even with no catalytic converter.

turbohonda

That is true in a NA application but not when it comes to turbos, they create their own back pressure.

Since the down pipe on a Greddy turbo kit is so small the 2 1/4" exhaust should be fine.


[Modified by turbohonda, 6:40 PM 1/8/2003]

hatch101

thank god. i have an APEXi n1 and im glad i get to keep it. thanks alot for everyones help.

93LSivic

2.25 is fine for what you need.

Hell, I run 2.25 and ran 12.7 @110 on my stock LS motor at 11psi. Im interested to see how much power I will make with the new built motor and 20 psi of boost on the same exhaust.

LS-hatch

Yes but your turbo will usually spool up quicker with a bigger exhaust. Exactly how much it will help you with that setup, im not sure. Im thinking of going 2.5" or 3" once im done with my turbo.