Just installed one and was wondering what everyone is set at. I know there is fine tunning and depending on what mods and stuff but just curious. Thanks.

 

Well I just put one in on my car and I have it set at pretty much the stock setting. It is at 36 psi. I have read that people set them to 50 psi. The most popular seems to be at about 46/47 psi. BTW I have a 305 TPI with a few bolt ons and hi flow cat and mandrel bent exhaust.

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"I'm not dumb, I just have an amazing command of thoroughly useless
information."
Bill Waterson creator of Calvin & Hobbes.

 

And now for the bad news...most of the stock eproms from GM are too rich for optimal performance. Increasing fuel pressure just compounds the problem. GM made the eprom slightly on the rich side to avoid warranty claims from toasted motors.

The theories of the advantage to higher fuel pressure are: 1) Higher fuel pressure provides better atomization of the gas and 2) Before people knew how to modify the eprom, if you modified your motor, this was an effective way of getting more fuel to the engine.

Increasing fuel pressure for the latter reason (needing more fuel) is best done inside the eprom. Increasing fuel pressure does not have a linear effect on providing more fuel, it is an "increasing curve" with the greatest effect noticed at high load (WOT) and the least effect at low load (idle/deceleration). Unfortunately, this may not be what the engine wants so you run the risk of running lean at low load or rich at high load.

I do agree with the theory of increasing fuel pressure to improve atomization, but you should adjust the fuel tables in the eprom to ensure the proper amount of fuel is delivered at all loads.

Also, do not go too crazy with fuel pressure. Increasing fuel pressure above 50 psi can cause your fuel pump to prematurely die. They burn out fast enough as is.