Whats the most horsepower a modded turboII can put down while still useing the stock turbo? I am asking this cause i am doing a turboII swap in my 87 na. I am planning on having it done at Acosta Motorsports in Wallington and am curious to see what people have done in the past.

 

IIRC somewheres in the 260rwhp is maxed out for the s4 turbo on stock ports. I dunno about any other ported motors though.

 

i heard about the same too, i think the max boost press. it can give is around 14.

 

My stock turbo dynoed at 267rwhp with Haltech and no porting.

 

220 to 230 with stock ECU and stock TMIC
230 to 240 with stock ECU and FMIC
Max 270 with a stand-alone and FMIC
This is basically all at around 15psi.
Running over 15psi has not been very successful in my experience.


-Ted

 

race rebuild on the motor ,street port, microtec, turbo back, front mount