???? For a L98 what is the best adjustable fuel pressure regulater (for those people who didn't know what it stood for)

 

IMO Holley makes the best unit. Its a little more expensive than the others but you can adjust it by hand. That makes it worth the extra $20 bucks to me anyway. I have the one Crane makes and its a pain in th a$$ to get to that little screw.
Later Barrett

 

I run the HyperTech AFPR in my '86 IROC and in the '88 Vette.

BTW, ACCEL (available at Jegg's) makes a nice gauge that resides on the fuel rail at the Schraeder.

 

About how much HP would you get out of it?

 

You will gain exactly nothing with an AFPR.

No really. An AFPR is a tuning tool, nothing more. You will only be able to gain as much power as you are currently losing to an incorrect A/F ratio. This will be different for every car.

It's worth having if you plan on actually doing some TnT with it. If you expect to bolt it on, set it to some number and then forget about it you're just wasting your time.

 

On a stock car assuming its a 350 maybe 4-5 to the rear wheels. If you have'nt already, do some of the "free mods". While you got the plenum off you might as well port it......right? Even the "little" stuff adds up over time.
Later Barrett

 

Why spend that much money on an aftermarket one, when you can go and spend less than 2 bucks and modify the one you already have.

 

i would go with the Holley unit, it comes with a new rubber gasket. no other AFPR does this, they just expect you to reuse the old one. i currently have the Hypertech peice, and after about 2 years, the vacuum bung has come loose from the regulator and can freely "wiggle". because of this, im switching to the Holley.

 

Isn't a good gain on the butt dyno though? lol Thats what i meant before about the HP, will you notice a diffrence? And is it worth it?

 

I'm a big fan of the low buck approach. Really i am, if you want proof i made an airfoil w/ epoxy putty.
But i did buy a holley AFPR. It is so nice to be able to adjust it, by hand, without having to remove ANYTHING, not even the MAP sensor. i mean, it's a no look operation, in the dark, talk about ultra convenience.
I suppose if you got creative you could put alarge diamter disk on a bolt for a homemade one to try to adjust by hand. The only thing is, the holley uses a special spring, which might work better for the avalibale fine threads. Also, i'd be worried about how well it sealed.
Just seemed worth it...

 

You have a good point Ed. You also don't have to worry about making mistakes when modifying yourself.

Take me for example, I printed out the tech article that Vader had posted (this was late winter, early spring 2001) and I followed it step by step and ended up with a nice finished product. But, there was a grave error in the tech article. There is a little piston/rod that needs to have some free movement of somesort in the fpr, well the tech article I had called for a ball bearing that was too small, and when the bolt was tightened, the piston could no longer float. We had the motor all together trying to start it before I realized the error. We put the fuel pressure gauge on it to see what it was at when cranking the motor over, almost 70psi! And this is a stock motor. . Needless to say, I backed the bolt out as far as I could just so the fpr could operate normally. I have everything to fix it, just lacking the motivation.

As far as access is concerned, I can get at the bolt easily with a small wrench.

 

My holley will be here on Friday. My accell died and it has a special regulator inside the housing. It's not a stock piece and accell does not sell just the spring parts, but the whole unit. I had the bolt seize up on my crane and snap off. In the process of drilling and retapping I guess the threads are too loose and allowing air to pass.

 

As for the hypertech afpr comming loose, mine did this also. I just drilled a little hole in one of those little adjustable hose clamps and cranked it down on the afpr.

 

Another person who is happy with spending the money to get the Holley.

 

I just got my Holley. Compared to the Crane and the Accel I had, the Holley is hands down the winner in quality fit, finish and ease of adjustment.
No more 1/4 wrench, allen key or any of that crap.