fp big28 max boost on stock motor

[climaxsr20]

sup guys. i have the fp big28.

whats the max or best boost i should keep my car at. i have the stock wastegate on it?

its 7 psi right now. i have all the bolt ons plus hks cams. stock injectors and maf.

[Jesse SR20]

I have a big28 also.

Before I upgraded my injectors and MAF, I ran 8psi (stock wastegate) daily for a while.

But now I run 15psi.

At 7psi, you will be fine. But the stock fuel system will not support much more than that.

[climaxsr20]

are you sure i cant run like 10 or 12 psi? thanks for the reply.

[DrifterProdigy85]

you could possibly get away with 10psi but you should really have something to keep tabs of Airflow % or Duty Cycle.

[Nismo_Freak]

With the cams you will not want to run over 9-10 PSI

10 PSI on a motor with cams will flow the same amount of airflow as a stock motor at higher boost.

[climaxsr20]

thanks guys. ill probably keep it at 7-9 psi until i get more upgrades. and i do have an autometer a/f gauge so ill keep a close eye on that.

[dustyk]

Dont use the Autometer A/F gauge to keep track of anything. It may very well be the most useless gauge ever made and wont tell you anything.

As for your setup, Id keep it around 8psi or lower for fear of maxing out your injectors and/or MAF. Upgrade your injectors, MAF, and get it tuned and then you can push 14psi all day

[nv240fastback]

I run 9 daily, its a sweet turbo, I cant wait to take it up to 15-18 pounds.

[drifter_for_life06]

i tihnk my turbo seals are going and was thinkign of getting the fpbig28

what do you guys tihnk about running 7-8psi on a stock setup... i.e. downpipe, testpipe, exhaust and a walbro? No front mount, no z32 maf or anything like that

[wildacexxx]

^^thats fine

[drifter_for_life06]

what kinda power will it or should it make at 7-8psi? The same as a factory t28?

[wildacexxx]

thats kind of a tough question. u can try and ask force performance to see if they know their turbo or just go to a dyno when u get it.

edit. wats the power rating on a fp28? the website doesnt say
Modified by wildacexxx at 9:47 AM 8/1/2006

[drifter_for_life06]

i saw on sr20forums that someone made 370

[DrifterProdigy85]

its flow is good to almost 350whp. i guess more could be possible. ive always noticed the huge amount of torque from this turbo compared to other turbos. A guy ran a 11.7x or something at 121mph. Thats pretty fast for a small turbo like the FP28