intercooler size piping?

[r1jlewis]

I've seen a couple of different FMIC setups and was wondering, on my sr20det with a T3/4 top mount with a pretty big FMIC (24"x4"x?), what is the best size piping for both the cold and hot side? I'm running 2.25" on both sides right now but I think i'm restricting. The 25G turbo has an outlet size of 2.5" and i just reduced it from there. I also am using a greddy intake plenum but don't think that really matters when it comes to intercooler piping size. It running over 400+ right now but if I upgrade the piping size, would I get more out of her?

[9240sx]

All 2" on the Hotpipe side...And 2.75" or 3" for all the coldpipe seems to work best..The throttle body is 2.75"..So dont go any smaller then that for the coldpipe.

[Rosco]

2.5" is good too...I'm using that right now.

[r1jlewis]

Run 2" on the hot side, even if the turbo outlet is 2.5"? It would seem like that would cause a restriction, or does that pressurize it better?

[Rosco]

I don't think it matters really. The stock T-25 oultet is about 1.75" and I have a peice of steel (that weird looking steel pipe that comes with most BOV's when you buy from Ebay) that has got to be about 1.5"-1.75". After that it's 2.5" all the way to throttle body. My only problem is Blowing off the small IC pipe. I f you want to eliminate this prob., just buy the Enjuku Racing hot-pipe w/BOV flange for $99.

[Rosco]

Misread.....Stick with the same size as your outlet...but again I really doubt .5" is going to make that much differance....Maybe when you are trying sqeeuze every ounce of power out of your car.