I'm looking for a good Fuel Pressure Regulator. I found one from Lingenfelter for like $80. Is it any good? Are there any others around that price that are just as good or better? Thanks.
JOHN

 

The stock Delco unit is the best and only one you should use. It will support 800hp as well, and its cheaper with a 1yrwarr.

 

So I can purchase a Delco Adjustable FPR then?

 

Don't bother with an adjustable if you are 94+ because the PCM compensates and sets your fuel pressure back after a little while.

Only worth while on 93 and older cars.

 

Just get stock delco its boost sensitive as well. You dont need to be playing with fpr anyway. I have a stock with 500hp.

 

I'm putting a new engine in with ported heads, intake, TB and a cam. With this new set up I don't need to adjust the fuel pressure? If I do, then I should of mentioned this to begin with.

 

Use a tuning program to adjust fuel/air settings. An adjustable FPR won't do anything as the PCM will compensate for any changes.

 

Can someone explain to me how the fuel sysetm works at WOT. I though the computer references pre-set tables. Which tables do they use? Are the O2 sensor outputs still being used at WOT? I have an AFPR that I havent istalled yet and would like to know.

 

at wot the pcm dorps the o2s and goes to a preset setting PE mode (power enrichment mode) which is able to be change with tuner cat. 11.7 to 1 af ratio is stock

the afpr will do nothing for you becuase the pcm is trying to hit 14.7 in closed loop. and like i said above in wot its preset. and the afpr will up the pressure but the pcm will adjust the pulse width on the injectors to reach the what ever the pcm is calling for. so will have a high fuel pressure with not differnce in fuel getting in the engine.

 

So the only way to change the A/F is though tuning?

 

Thats the only way to change under WOT.

 

Thanks for the info. Which program is best (Tunercat or LT1 Edit). What one is cheaper?

 

personaly i like tuner cat

 

In general, there is no need for an adjustable FPR. Your tuning should be done in the PCM software. However, the PCM does not control FP. Rather, it makes changes in fuel delivery by adjusting the injector open time (pulse width) based on O2 sensor input. FWIW, I used the stock FPR to 733rwhp last year.

Rich Krause