So on the current setup I'm working on, the cold side (after IC) charge pipes are 2.5". The hot side (between turbo and IC) is 2.25"
In regards to the hot side, I have some extra pipe. So would I be better off to have the first half of the hot side in 2.25" and transition to 2.5" for the second half of the hot side (as well as keeping the cold side 2.5") or would it be best to have the entire hot side 2.25"?
My concern with the 2.25" pipe is that the inner diameter is only 2", so I'm thinking the sooner I transition to 2.5" pipe, whether that be before or after the IC, the better... Thoughts?
Turbo outlet is approx 1 7/8" Inner diameter. Goal is 350-400whp.
12.6 @ 114.6 MPH
#1 Your using 1/8" wall tubing?
Usual IC tubing is 16 ga. or .065 wall.
I would transition right off the turbo.
Then get a 2.5" inlet and outlet IC.
Are you using aluminum, steel or stainless.
I would just use a simple conical reducer.
The 2.25" is SS, the 2.5" is aluminum. You think the entire thing should be 2.5"?
12.6 @ 114.6 MPH
Just transition from your turbo with a coupler. No need to change pipe diameters in the middle somewhere, or just go get some pipe thats the size you want
Some people run smaller hot side pipe then cold side. Im running 2" from the hot side to the intercooler, transition up to 2.5 with a coupler(the I/C has 2.5" outlets) Then straight 2.5" from the intercooler to the throttle body.
If I were you looking in that power range, id go with like a 2.5" hot side and a 3" cold side. Im sure you can get away with 2.5" to 2.5" if you wish as well. Whats your plans for routing? Going under the engine?
Edited 1 time(s). Last edited Tuesday, September 13, 2011 3:50 PM
"Straight roads are for fast cars, turns are for fast drivers"-Colin McRae
Hmm... Why do you both say 2.5" for the entire length? At 20psi, I should be consuming 585cfm @ 6500rpm. If the inner diameter of the 2.25" pipe is only 2", that's still large enough to flow that amount. The velocity of that cfm in that pipe would be at 0.40 mach, about as fast as you wanna flow before turbulence starts, but again, that's at 20psi and 6500rpm... prob about the absolute max it would ever be. In a 2.5" pipe, that would only be around .25 mach, so a much slower velocity, plus more space to pressurize, however less loss around bends. I think its around a 1% loss per 90* bend. I have 6 on the hot side.
Still think 2.5" for everything?
12.6 @ 114.6 MPH
