Fuel pressure..........?

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Nov 4, 2006 | 01:00 AM

ZEX-Z

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From: Angleton, Texas

Fuel pressure..........?

What is the minimum and the average output of fuel pressure on an LT1?

Nov 4, 2006 | 07:05 AM

Formula350

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From: Decatur, TN (N-W of Athens)

I always thought 40-45PSI was the GM range. I know my TPI made that, but I haven't put a gauge on my LT1 yet. Someone here said theirs did 35 at idle and I think like 44 at WOT.

Here's what TPIS had to say (They're local for me, and I hear ALOT of good things about them, so I trust their word)

Quote:

The LT1 fuel pressure is unusually high for the way the computer is calibrated. We are finding that, unless you send us your computer for reprogramming, you will be faster at 39 PSI, with a stock to bolt on modded engine. Installation time: 30 minutes.

Nov 4, 2006 | 07:26 AM

koolaid_kid

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From: Indianapolis

You should be around 38 psi at idle. At WOT (simulated by removing the vacuum hose) you should be about +4 psi from idle. Just went through all this with my car, unfortunately.

Nov 4, 2006 | 11:37 AM

jm93camaro

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From: QCA, Iowa

42-47 is recommended.

Nov 4, 2006 | 12:45 PM

LT1BRN

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From: Kingdom of Bahrain

i just tested mine an hour ago and it was 35psi at Idle, I dont know if thats good or bad.

Nov 7, 2006 | 10:16 AM

camar0corey

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From: Spring Hill, FL

I'm sitting at 31.5psi roughly at idle (who knows how accurate the autometer gauge is?) and then around 40.5 psi at WOT.

Nov 8, 2006 | 01:05 PM

siniSSter

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From: Quarter Mile Performance

Is that on the stock FPR or and ajustable FPR? Just wondering because on mine I set it to 50 psi on a nitrous run, then after the run its back at 44 psi..I guess its the PCM taking it back, since I'm at WOT.