I saw a few dynos on adjustable fpr's and i noticed huge increases for their price. Do these really give this much hp and what is involved in setting a system up? Do you need to do dyno tuning with afr to achieve this hp or is it just a plug in thing? Worth getting for a bolton lt1? Will it help/hurt gas mileage?

 

In the case of a stock engine, it will not help you. They are already set up to run slightly rich. Those that have Hi-Po engines need to regulate pressure to help the fuel system keep up with demand.

 

Hey i just installed one of does (Aeromotive one) I heard that after adjusting pressure the computer will compensate to get back to normal. Is this true? Also any tips on adjusting press.

 

The computer has no influence on the fuel pressure. Only the pump, engine vacuum and the regulator.

The part you bought should have had instructions in the box.

I like your pronunciation, I would of thought you were from New York. Dees, Dat and Does. That's funny right there. I don't care who you are.

 

While it's true that the computer can't adjust the fuel pressure, it does adjust the injector pulse width to compenstae for a change in fuel pressure. An adjustable fuel pressure regulator is useless on a near stock car. It's value is to compensate for undersized fuel injectors on a higher HP car by allowing you to bump up the fuel pressure. A better investment is the right size fuel injectors.

 

I just read "does" oops just kind of tired. It's suppost to be "those" anyway i'm from PR studying in OHIO.

 

An adjustable regulator can only net you gains if the tuning is off in the car, and then can only modify the WHOLE fuel curve not just the part that needs tweaking. Leaning out or richening up WOT for power will do the same thing to part throttle, and if the pcm sees part throttle as long term lean it will add fuel to correct and keep doing so at WOT as well so all your gains go away. Not to mention if you did it right with pcm work the WHOLE fuel curve can be dialed in exact then tweak the spark as wel plus tranny tweaks. The pcm work doesn't cost anymore either and less for OBD1 cars and since it can more accurately tweak so much more than just fuel it is money infinetely better spent.

AFPR do have uses where someone is trying to bandaid too small an injector(or is pushing the limits of available pcm compatible injectors) and increases pressure to make them act larger but then pcm work is still needed to do the actual tuning.
Really I would sum it up as if you have any questions about them then you don't need it and your money is better spent on tuning.