MKII_Supra
Member
I have been looking around at other people's setups, and see that IC pipe size varies quite a bit from build to build (along with variation on turbos, boost level, intercoolers, etc.).
I am using a Borg Warner S300SX3-66 which has a 3" compressor outlet. Since the throttle body seems to be the most restrictive point of the system (besides the individual intake runner) and it's diameter is around 3", it seem that the obvious is to go with 3". I am a bit worried however that with the length of IC piping being used and the lower boost I plan to run, 3" will realy reduce the intake velocity and be somewhat inefficient and laggy. I ran 2.5" on my previous 3 liter inline 6 with a 61mm Garrett, and was happy with the response.
Is there anything major to gain from using 3" IC pipes, or will the losses be justified by going with 2.5"? I plan to build my pipes with aluminized steel tubing since I have a MIG and can easily weld steel.
Thanks, -Mike
I am using a Borg Warner S300SX3-66 which has a 3" compressor outlet. Since the throttle body seems to be the most restrictive point of the system (besides the individual intake runner) and it's diameter is around 3", it seem that the obvious is to go with 3". I am a bit worried however that with the length of IC piping being used and the lower boost I plan to run, 3" will realy reduce the intake velocity and be somewhat inefficient and laggy. I ran 2.5" on my previous 3 liter inline 6 with a 61mm Garrett, and was happy with the response.
Is there anything major to gain from using 3" IC pipes, or will the losses be justified by going with 2.5"? I plan to build my pipes with aluminized steel tubing since I have a MIG and can easily weld steel.
Thanks, -Mike