I've thought about picking a Holley AFPR for my Car....I've read in Summit and in Jegs about them....but it really doesn't say much about the performance. I know you can adjust your fuel pressure....what does that actually do? Does it make your engine use more gas? How about horse power gains?...or any gains at all? I'm really not into much engine work...just the basic bolt-ons...and this is the very last bolt on if I decide to get one.. If anyone has any helpful info, that would be great. I've done a search...but haven't found what I'm looking for...

 

The way it was explained to me was like this....


Take a spray bottle, squeeze it lightly, then squeeze it hard. You get a much better spray pattern when you squeeze hard. So by increasing your fuel pressure, your pretty much doing the same thing.



This is just what I heard, it could be wrong.........


I also heard after putting on headers, some cars lean out a bit, which an AFPR would come in handy.

 

You do get better atomization with higher fuel pressure, but keep in mind that you will also be adding more fuel that the computer isn't expecting (unless you burn a new prom with an up-to-date constant) and it will throw off its fuel calculations.. Granted, bumping it up a few pounds probably won't put it out of controllable range, but the best thing to do would be to burn a new chip...