I have read on here that the Adj. FRP only adds power at WOT. True or False?

 

Well it should alow for better tuning allowing for more power at every rpm, especially at WOT.

 

The ECM will compensate for a 15-20% change at part throttle, but it will effect full throttle… on my stock 87 L98 I ran my fastest quarter miles with between 52 and 54psi base pressure, but that was also enough that I was getting some black soot on my back bumper during normal driving

 

Are they helpful even on a relatively stock car? At this point in the game, trying to conserve MPG in a V8 is like making orange juice w/o destroying the orange.

 

Reread my original post… yes, it was a stock L98, and although the higher fuel pressure did leave soot on the back bumper, I wan’t able to log any change in mileage.

V8’s can be built to have good gas mileage, but a TPI or 350 are not the ways to go there…

 

When you say best times, how much better than the stock pressure? I guess give me some numbers. After headers, I will doing the little things while I save up for my paint job. Like, port TPI, afpr, airfoil, tb bypass....yadda yadda yadda.

 

In *most* cases, an AFPR will not do much good for a stock car. But it depends on the specific application. A good tune will do far more. My car (302, granted) was substantially modified, but it still ran best with stock or very very close to stock fuel pressure, even though I did have an AFPR. What it DID need was a tune, but never got it before the motor blew.

 

As per the corrected numbers in my timeslips spreadsheet, looks like it was around .09s and 1.3mph in the ¼ at 52psi vs stock