s13 with a s15 duel bb turbo hp#s???

[da40]

i have a s13 red top and thinkin about putting a s15 duel ball bearing turbo in place of the t25 .i wanna make around the 340-350 hp wise can i acheive that goal?Ofcource with all the fuel upgrades and the s-afc already on the sr20 ....thanks

[afracer]

Negative my man. A VERY well tuned red top with an S15 turbine will make at most ~300-320 rwhp. The turbo just won't flow anything more than that. And I'm not talking SAFC and injectors for tuning... cams, fuel pump, Z32 MAFS, full 80mm exhaust, FMIC, and an ECU tune w/dyno work.

My redtop put down 285 rwhp with the following mods:

S15 turbine on equal length stainless manifoldNo cat converter, 80mm DPDenso Iridium plugsZ32 MAFS11lb chromoly flywheelGreddy intake manifold w/Q45 TB555 Nismo Injectors/Walbro 255/Nismo FPRFMICBlitz DSBC @ 1.2 barUnorthodox Racing underdrive pulleyGreddy Accessory pulliesCustom ECU tune

I could get a few more horsepower with a set of cams and more fine tuning, but probably not much more than 300 rwhp. A good port/polish job and headwork might get you to the 310-320 range but you're just about maxed out unless you raise the compression and run race gas, but then that's all you'll run.

If you can do otherwise, good luck and let everyone know how it goes. I'd be very anxious to hear how you did it because I run two cars with redtop/S15 turbos. Good luck!

[da40]

thanks for the info

[mackdaddy240]

Did you put a better head gasket in? I heard the stock head gasket wont take over 15psi. My T25 is going out and I'm about to get a gt28rs hopeing for 300whp. was yours just a gt28r ?