Depends on mods, intake temps, octane of fuel, quality of tune, etc. 4x850 cc injectors should be good for at least (very conservative) 350 wheel HP with stock fuel pressure. 13-14 psi should be "safe" on pump gas with a good tune. An Upgraded fuel pump and intercooler would be recommended at this point which it looks like you have already done. You might get Steve Kan's oppinion too when you get tuned .

 

Dont mean to bring this back from the dead but where exactly in the pfc do you make these settings? Iam kind of a noob when it comes to screwing with the pfc.

 

I suggest you read the PFC manual. If you do not have it, search this forum to find it.

DAPDAS

 

Back form the dead again. has anyone actually leaned out AFRs at idel to 14-13? As someone else here said i got it to 14 - 13.5 with a nice smooth idel at -.22 to -.20 lag times but again leane dout hardcore everywhere else the minute you gave it sudden accel. I tried to adjust the accel part of the PFC to compensate for this but it didnt work out how I wanted it to. I figured it would bring the injector lag times right back to .04 if i did that but Again I didnt see that happen and my car just died...may have even shot the motor just now (I'm new to this give me a break) and this was in idel. I cant road test it right no becasue the brakes are gone getting P coated. I figured the accel portion of the PFC woudl allo wme to bring it back to .04 lag time through the power band....I coudl rev it slowly up the RPM scale and I would get AFRs of 12-10. Again in neutral. Then when I gave it a sudden accel the AFRs would go ski high and the engine just died and I blew the B1 fude but I think that was thanks to the alternator.

 

Actualy is it possible to adjust lag time through out the power band?

 

Bring back the past for good info!

 

x2 ^^ I am about to run 4x850's and I have seen alot of good info in this one for neccessary changes.

 

I'm getting about 10.8 - 11.1 AFR at idle with 4x850.

While trying to troubleshoot some tip-in issues, I replaced the stock FPR with a Sard one.

I turned on the car and got around 11.1-11.5 AFR @ 39psi on the fuel pump's low speed. The idle was really quiet. It shot up to 55psi when on the high speed and dropped the AFRs back to the mid 10's.

I haven't driven the car since I put the FPR in (currently in the middle of adjusting it). I figure I could reduce the fuel pressure and set the base pressure to 40-45psi on the high speed. That way, idle could run less fuel.

Then, I'd just retune my fuel map to compensate the boosted areas. At least, that's the plan.