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View Full Version : Q45 Throttle Body And Piping Size Questions


juiced305diesel
03-30-2009, 09:38 AM
Hey guys I am debating on getting a larger throttle body for my setup. I have searched but yet to find any back to back dyno comparisons. I am also debating what size piping to use as well. It is a SR20 GT35R with a Tial Vband .82 exhaust housing, JWT S4 cams, Greddy intake mani. The intercooler has 3" inlets and is four inches thick. I already have the Greddy Cold pipe which is 2.75" I was wondering if I should switch to a 3" on the cold size and a 2.5" from the turbo to a 2.75" to the intercooler on the hot side. Please keep in mind I only drag race or do 45MPH or 60MPH rolls. ;)

nsn240
03-30-2009, 11:20 AM
3" cold side is what most people run because it matches the IC in/out and the stock throttle body so no problems there - If you work out the math 2.5in piping is good to 500+ hp...

juiced305diesel
03-31-2009, 05:05 PM
Yeah i did the math on the piping i was just wondering the difference in spool. Does any body have some before and after dyno numbers on the Q45 TB.