no the only reason you would need or have use for a AFPR is if the duty cycles on the injectors are maxed out at 100% then you could up the pressure and get more fuel out of them. but you never want to run the injectors over 85% duty cycle. if you wun the injector cycle maxed out they will malfuntion and overheat.

the only way to mess with the fuel in any way is to do through the pcm.

these cars run rich so if the AFPR work on our cars you would need to lower the pressure to lean it out, but its the same thing it will lenghten the pulse width if you lowered the pressure.

there are no good for our cars.

ws6.com put one on a car and gain 6 hp i think but the next day they lost the 6 becuase the pcm corrected for it.

 

Thats good info.
I figured it would correct at part throttle but I thought WOT would be different.
Thanks.

 

not a problem

theres alot more technical info if you search "AFPR"

 

but that whole theroy is altered on a 93 with speed density correct?

 

yep

from what ive read on the board speed density cars have good results from them.

 

I don't plan on getting one for my car, but an AFPR can allow you to lower the duty cycle of your injectors and you will get better atomization of the fuel at a higher pressure. Some people claim this is worth a few horsepower.

 

I haven't seen the old AFPR argument in a while. There are several correct people on here. As far as changing the target AFR of the computer on 94+ cars it will not. But if you have a heads cam car that is maxing out injector duty then an AFPR becomes necessary or new injectors are needed which in turn requires computer tuning alteration. I personally like to run my fuel pressure around 50psi which works good with my nitrous tune. Are there any advantages? Doubtful but it works for my car.

 

I just wanted to make sure that my car would not ever run lean with this big cam. I'm purchasing tuner cat to retune the fuel tables for the CC 306.

However, one of my friends said that I would have to up the fuel pressure to make sure I have enough fuel to not run lean with this cam. Is this the case or not?

Thanks for the help!

 

Definately a good idea to up the fuel pressure if you do not get bigger injectors. This will simply keep the duty cycle lower on your stock injectors.