Is anyone running holley' regulator Part # 510-512-501 at Jegs....Does it really have that big dial type adjustment and how do you like it?

 

I have one of those. It does have a large **** to adj the fuel press. Don't need any tools to adj it. It's probably the most popular AFPR around. I like it!!

 

Awesome thanks for the info

 

I am running the Holley AFPR also, its great, as said above, no tools required to change fuel pressure, very easy to do.

 

I run one also and it is an excelent user friendly AFPR.

 

Thanks guys for the feedback

 

Got it today....It works great....But it seems a little tough to turn....Is this normal? Oh yeah and is there a reason they gave me to of the top washers? (you know the one that goes between the spring and the dial) is that normal?

 

You may want to check for clearance against the bottom of the plenum. I had to do some minor grinding on the bottom to get it to adjust. Although I think this may have something to do with the SLP runners also.

 

I dont think it was or is hitting the plenum or the runners but i will check it out.....Thanks

 

I had to grind my plenum a little cause of interference when I tried to back off on the fuel press.
I'm running an Accel manifold and runners if it matters.

 

- most aftermarket runners are shorter than factory runners, thus causing your "rub" -

 

I just checked and I have plenty of clearance....My only issue is space to get my fingers around it because of vacuum lines, coil, distributor, and all that junk. LOL

 

do you have a gauge to read pressure? or does it have settings on it to tell you what PSI your running?

 

You need a gauge to hook up to the valve on the fuel rail.

 

Yes I bought a gauge.

 

remember you must disconnect that vacuum lining before adjusting fuel pressure. i also did some grinding on my plenum to clear it but i think thats because i didnt have the dial screwed down enough during install.

 

you guys see an improvement? I was told to turn up the fuel pressure to around 50psi.
I think I still have my stock one. I'll have to double check when I get it out in the spring.

 

I've also heard that the L98 and Lb9's run rich at WOT on the stock tune. And people have actually turned their fuel pressure down to lean it out, and got faster.

 

Never heard that before, do you have anything to show that?

Just wondering because Iv'e heard the opposite.

 

Just word of mouth, thats all. I have no data.

 

It's very true when the l98 was stock. I bumped the pressure down to about 40 psi from the factory 44 or 45 and it was reasonably quicker, not much but noticible.

However, once you get some mods like exhaust, ported tpi, runners, filters ect, bumping it back up to 44 or 45 helps.

 

Huh, Ill have to remember that, thanks.

 

yeah I have headers and a nice exhaust. Plue the SLP air induction, Hypertech chip, accel wires, cap , rotor, and coil. Plus some other things. I was told to turn it up from the stock 44-45 psi to 50psi and I should see horse horse power and torque. I guess I have to wait till spring to see what I have. But let me know what ppl have done.

 

I took mine and bumped it from 44lbs to 48lbs and it made a pretty big difference, average a little quicker than a 10th in the quarter, with a total of I think it was 12 passes. I played with it at the strip most of the day and you could really feel the kick in the pants at 48lbs, and actually slowed down at 50lb, so with my stock combo/ just a KN filter set up 48lb seemes to be my optimal fuel pressure. And thats with stock injectors, dont know what you have but if bigger you may have to drop back some. Good luck.

 

Thats good info ZEEYAA. I'll have to look at mine when she gets out in the Spring. I know I should have stock injectors.

 

ive got that same afpr and its great
when it comes to the most optimal setting its all about trial and error. What will work for one guy's setup might not work for yours. Generaly speaking of course. Its great to have not just for your setup now but you can always dial it in when you upgrade other components.

have fun

 

Where can you buy just the top plenum to runner gaskets?

 

most afpr's come with the gaskets.

I have had the plenum off twice and reused the stock original gaskets both times

but u can get them at advance auto parts, napa, possibly auto zone or pepboys.

I just did injectors and didnt even think to put on a afpr!!

 

Be aware that there is a crown to the **** on top, so while it looks like you have clearance under the plenum looking at it from the side, in the middle it's hitting. I did have to clearance mine.

I also had a very inopportune failure of the Holley diaphragm, the car started stalling and running very badly. I took it apart, cut the stock diaphragm off the stock spring, and used the OEM diaphragm with the Holley spring/adjustable cap, and it does work very well.

Any time you change your setup significantly, especially on the intake side, you will get leaner. Stock is a "Safe" rich tune at higher RPMs, but lean down where they smog test them (lower RPMs)

Good luck
TA

 

Does anyone know off hand why this afpr is considered good? Everyone that has the afpr that comes with HSR fuel rail setup says their junk. Are they both the same regulators? I can't see why the TPI one is good and the HSR version sucks! I'm just a little confused about this....

 

If you increase your fuel pressure past the point of noticing an improvment are you running to rich?