Aftermarket up-pipe and turbo spool
#2
#3
Scooby Regular
Does it not depend on how much air you also want to shift and whether a certain size actually causes choke? Not sure if this is applicable to up-pipes though.
#4
Yes and opening up the bore will decrease the force with which the air strikes the turbo and that will slow the spool. As you open up the bore up you're allowing gas molecules to move more in other directions so fewer of them will be striking the impeller simultaneously. Your turbo will choke long before the up pipe will. Also, opening up the pipe is an excellent way to supercool the exhaust gas before it hits the turbo by creating a nice big pressure drop...
Last edited by aXeL; 02 October 2009 at 08:03 PM.
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