Fuel PSI @ WOT?
12-09-2003, 09:57 PM
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Fuel PSI @ WOT? I just installed an Autometer fuel PSI gage on my M6 01 SS. My fuel rail PSI with normal driving is 60 PSI but it goes to 54 PSI at WOT, I thought my WOT PSI is not suppose to fall below 55 PSI. How low does my fuel rail PSI pressure have to go before It's too low? I have a cam, headers W/ all the bolt on's making a little over 400 HP to the wheels N/A so I thought I should still be safe on a stock fuel set up. With the slightly low (what I believe to be low) fuel PSI Is that an indication that I should start looking into upgrading my fuel pump already with only 400 HP to the wheels? Thanx in advance. 
12-11-2003, 02:43 PM
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That's not at all unusual. Get worried if your FP drops below 50 PSI or especially if you note that you find that you're running lean.
I actually used to run 500 RWHP+ at less than 50 psi (about 45 as I recall.) I was able to adjust so that it wasn't running lean but to do this I hade to run my bank 1 side run richer than my bank 2 (the first rail was getting the fuel first and thus was seeing a little better FP.) I upgraded my fuel supply to bring the pressure back up to around 55 psi and that took care of the B1/B2 discrepency.
I actually used to run 500 RWHP+ at less than 50 psi (about 45 as I recall.) I was able to adjust so that it wasn't running lean but to do this I hade to run my bank 1 side run richer than my bank 2 (the first rail was getting the fuel first and thus was seeing a little better FP.) I upgraded my fuel supply to bring the pressure back up to around 55 psi and that took care of the B1/B2 discrepency.
12-11-2003, 07:42 PM
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Originally Posted by Colonel
That's not at all unusual. Get worried if your FP drops below 50 PSI or especially if you note that you find that you're running lean.
I actually used to run 500 RWHP+ at less than 50 psi (about 45 as I recall.) I was able to adjust so that it wasn't running lean but to do this I hade to run my bank 1 side run richer than my bank 2 (the first rail was getting the fuel first and thus was seeing a little better FP.) I upgraded my fuel supply to bring the pressure back up to around 55 psi and that took care of the B1/B2 discrepency.
I actually used to run 500 RWHP+ at less than 50 psi (about 45 as I recall.) I was able to adjust so that it wasn't running lean but to do this I hade to run my bank 1 side run richer than my bank 2 (the first rail was getting the fuel first and thus was seeing a little better FP.) I upgraded my fuel supply to bring the pressure back up to around 55 psi and that took care of the B1/B2 discrepency.
I guess I'll replace the fuel system when I get nitrous on the car just to be safe. 
12-15-2003, 11:03 PM
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Originally Posted by JoSeY
try just replacing ur filter 1st....quick and easy. My WOT is 65psi on stock pump and all....
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12-16-2003, 10:38 PM
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Originally Posted by Pro Stock John
54 psi sounds okay, I would see 58 at idle and about 55 psi at idle.
I had one pump that was 35 at WOT that was no good.
I had one pump that was 35 at WOT that was no good.
