going to boost here soon. purchasing 38mm tial. was wondering what pound spring to get to reach my goal 0f 300hp. stock b16a 10.4-1. either t3/t4 50 trim or 57 trim. more than likely a 50.

but knowing what spring for both would be nice.

any help appreciated

 

93
Well, info is lacking, but taking a stab in the dark, 12 psi should do it(whp) on a stockish b16. This is asuming a good exhaust, fmic, and, of course, a proper tune. Big red is 11.6 psi, big green is 13.05. These are'nt always accurate which is why it's better to go with a lighter spring and a boost controller.
93 93/93

 

with a stock gsr i used a 7 pound spring with a boost controller giving me 9.5-10 pounds, gave me 306whp. but this is on a 1.8 gsr, u may need a couple more pounds to reach your goal