IC pipe sizing question

[Drewcool2]

As my mod list shows I have:
50 trim, 272's, apexi fmic, sbr exhaust manifold, 1g tb, 2.5-3" exhaust, dsmlink, ect...

I have the greddy intercooler piping kit as showed in the picture. The upper IC pipe as well as some other piping is 2 1/4", but the main lower IC pipe is a tiny 2" pipe(It's the pipe on the bottom of the picture). Would this be affecting my performance at all because of the tiny diameter of one peice of lower IC piping? My turbo outlet is 2" like most, but I don't know if it makes much of a difference going right to a 2 1/4 pipe. And where could I find this same pipe in 2 1/4"?

 

[gsxtacy]

with pressure drop being a factor across any air to air intercooler....it is totally normal to use a small diameter compressor outlet pipe to keep velocity up, after the drop of the IC it is common practice to open up to 2.25 or 2.5 or even 3" all the way to the TB.

Looks like you have pretty good power from your mini-profile, there.

gsxtacy

 

[Drewcool2]

with pressure drop being a factor across any air to air intercooler....it is totally normal to use a small diameter compressor outlet pipe to keep velocity up, after the drop of the IC it is common practice to open up to 2.25 or 2.5 or even 3" all the way to the TB.

Looks like you have pretty good power from your mini-profile, there.

gsxtacy

So replacing that pipe to a little larger diameter wouldn't do much?

 

[sweet97]

Yeah it sounds like he said it would not do much! However www.dejonpowerhouse.com would have a larger pipe or be able to make one for you. Many sell a larger turbo outlet pipe also. You do have decent numbers! Mark
PS: How do the 272's idle and make much power over stock?
I'm going to install a set tonight.

 

[DSMJim]

My car is 2" lower and 2.25" upper. Pressure drop really comes from the intercooler as it is the real restriction. A straight piece of pipe will out flow an intercooler anyday, so the pipe size is not hurting you. Smaller pipes keep velocity higher, and have well enough size to flow enough air.

People go way to large many times because they thing bigger is better and it's not always.

 

[psychlow]

People go way to large many times because they thing bigger is better and it's not always.

I agree. My theory is just to make sure you're not going any smaller than the turbo outlet. As long as you do that, you won't be creating bottlenecks.