What is a safe psi level for the S13 red top sr, other than just 7? The engine is completly stock, with a full JIC exhaust, but i would like to run more boost, but not to sure what a safe level is. Any info would be great..

 

i ran .9 bar which is somewhere around 13 psi or something. i ran it like this for about 2 years with nothing happening, on a engine that had nothing but bolt ons.

 

Yeah i was going to say somerwhere around 12 to 13 psi. Stock turbo looses effeicency around 14.5 or so.

 

with a stock fuel system I would stick to 10psi... with an upgraded fuel pump and FPR 13psi would still be safe.