2871r/enthalpy what PSI for 300whp?

[dorkidori_s13]

most of the posts ive seen about the GT2871R seem to point to 12-18psi to hit 300whp depending on modifications and tune. it seems like most folks were also running stage 1 or stage 2 cams with turbo to help the head breathe a bit better as well. i will be going with a GT2817R later this year to replace my aging (and leaking) S15 Spec-R turbo. im currently putting 260whp out in 91 octane at 14psi on the ol S15 spinny thang.

i think what may limit you is running the enthalpy ROM tune instead of a full stand alone which can be dyno tuned in real time... and possibly your injectors depending on how much duty cycle you have to push them toward in order to make the desired 300whp. usually when you start getting up in the 85-90% range, youll need to go with bigger injectors. i think my Tomei 740s are only in the 45-50% duty cycle range currently. im guessing yours at 300hp are going to be near the 80-90% range as they are quite a bit smaller.