Re:how to size up your pipe?charge that is
 

I just looked at the diameter of the hole coming out the compressor and just used piping of the same size up to the intercooler; it was something like 1.25" ID and the throttle response was amazing. After the intercooler it stepped up to 2.25". I've looked at some "pro japanese" turbo drift cars and they seem to follow this logic for good throttle response (small pre intercooler piping followed by large piping going into the t.b.); but what do they know?? :P

Going purely on theory (usu not the best way), you want the smallest pipes possible without causing enough restriction to cause a pressure drop from the turbo to the t.b. Turbo's flow a certain cfm (volume/time) so the turbo will pump a certain volume of air per unit time. If you have big ass bling bling pipes it'll obviously take more time to pressurize the volume of the pipes.

The best way to figure it out? Use different sizes and see which one works best.

Re:how to size up your pipe?charge that is
 

correct, i didnt quite specify that. it all depends on how much air youre pushing. all i'm saying is that bigger charge pipes are better because they have more potential. and no you wont see hardly any difference between 2 and 3 inch charge pipes. I never said use 6 ::)

Re:how to size up your pipe?charge that is
 

I ran 2inch to the intercooler and 2 1/4 from cooler to tb, on a d16a6 and a t25 turbo. Seams perfect spools fast, maybe too fast :-\ I would go bigger for a dohc ;)

Re:how to size up your pipe?charge that is
 

I have a b16a2, i have a t3 60 trim with a 2" outlet, would i be better off running 2" from turbo to intercooler, and the 2.5" from the intercooler to tb? any suggestions?

Re:how to size up your pipe?charge that is
 

^^^ I would run 2.25 from turbo to cooler, 2.5 from cooler to tb. Get an reducing adapter to go from 2 to 2 1/4 ;)

Re:how to size up your pipe?charge that is
 

thanks much