Mod List:

Stock port
Stock twins @ 14psi simplified sequential
Homemade boost controller
PowerFC
4x850cc injectors
Apexi Intake
Koyo radiator
3" Pettit Downpipe
3" High-flow cat
Apex GT Catback
No A/C

I tuned it myself with the assistance of a dyno and a LM-1 wideband kit.

Everything works fine with a minor inconvenience involving low vacuum throttle (air pump issue), but the boost patterns during my dyno runs give me concern about how much power I'm loosing using the stock IC.

At low RPM's the boost bounces between 12-14psi, but after the secondary turbo becomes active, I get a pressure drop that evens out to about 11.5psi which is where I make peak power.

If replaced the IC with a medium core to make my boost more consistent, how much whp should I expect from my setup?

Thanks in advance for any suggestions.

 

No takers?

 

at 14 psi i would expect 290-310 whp(with the upgraded ic).

10psi is hard enough on the car with the stock ic. 14 psi is just asking for it.

 

my dad's R1 made 290 with stock ic and main cat at only 12 psi (fresh motor/turbos, dp/cb/intake/pfs box).

IIRC, I made ~340 rwhp back in 2001 with intake, dp/mp/cb/m2 large at about 1 bar. The motor had a 'light' streetport on it which was mainly just polished runners.

 

I will probably end up pulling the boost back to 12psi since that's what it is getting anyway at peak power.

I was hoping to get close to 330-350 whp with a new IC.

 

your goal is definately attainable. if it were me, i would get a midpipe and and port the wastegate. it is an easy way to unlock some power out of our mighty 1.3's

 

I have a mp in the garage, and a port will have to wait until I have a legit reason for pulling the turbos off.