s4 turbo max psi?
 

Ok, so theres a debate on what ther max psi you can push, ive heard 12 and 14... I know the stock intercooler wont allow much more than 12... so with a front mount and the right fuel... how much boost can it push?

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12...not really efficient after 12.

12 is about as far as you wanna go on a stock turbo....that is, if you have larger secondaries...

anything after that, it just blows hot air...

although YMMV, i know someone running 1 bar on ARC top mount . . .

one bar on an arc top mount...what a waste...

First of all...at 15 PSI, the stock turbo is blowing hot ass air. second, the arc top mount is pointless because it still heatsoaks the same as the oem tmic...

better to stay at 12 psi and go with a front mount...

2 questions:

what is the limiting factor on the stock turbo?

is it worth trying to put bigger/better wheels in the stock housing?

check out BNR they do good work tossing in bigger wheels.

when i bought my car it was set up with a profec b boost controller. s5 turbo stock tmic, low boost at 8 or 9 psi high boost at 14. there was not to much of a difference and it was probably really dangerous to be at 14. I popped the motor at 17 -18 psi on a drunken highway pull(whoops).

well, i just that BNR site. other than clipping the exhaust, it seems that the focus is on the compressor side of the turbo in all 3 stages. so i guess that means the limits of the stock turbo are imposed by the compressor side, eh?