Fuel Pressure??
11-19-2008, 07:30 PM
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Fuel Pressure??
Does anybody have any idea what kind of fuel pressure an LT1 should hold at idle?? I ask because I have built a 350 to replace my 305 and the new motor has got a cam a little bit more radical than the LT1. I know its going to run lean anyhow because the computer is not tuned but i have an adjustable fuel pressure regulator and would like to at least try and get it to not run too lean..
11-20-2008, 08:56 AM
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Car: 1992 Z-28
Engine: 350
Transmission: auto
Axle/Gears: 3.73
Re: Fuel Pressure??
Hi
I assume you are talking about a LT-1 (mid 90s) - I believe this is correct:You should be around 38 psi at idle, sitting in your driveway. Then disconnect the vacuum hose from the FPR. Your pressure should go up around 4 psi, simulating WOT.
thanks
Bill
I assume you are talking about a LT-1 (mid 90s) - I believe this is correct:You should be around 38 psi at idle, sitting in your driveway. Then disconnect the vacuum hose from the FPR. Your pressure should go up around 4 psi, simulating WOT.
thanks
Bill
11-20-2008, 11:55 AM
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Car: 1987 Black IROC-Z (SOLD)
Re: Fuel Pressure??
Fuel pressure...36/38 PSI key on & engine off and 40 PSI at Idle.
Picture of FP gage under STB.
Picture of FP gage under STB.
Last edited by DJP87Z28; 12-23-2008 at 12:02 PM.
11-20-2008, 01:19 PM
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Car: '86 Bird, 96 ImpalaSS, 98 C1500XCab
Engine: LG4, LT1, L31
Transmission: 700R4, 4L60E, 4L60E
Axle/Gears: 3.73 Tors, 4.88 spool, 3.73 Eaton
Re: Fuel Pressure??
As an owner and tuner of LT1's (The LT-1 is the Gen 1 version from early 70's), here are the numbers:
Engine running with vac line disconnected and plugged: 42 +/-2 psi. Key on/engine off will show slightly less due to only battery voltage being applied to the pump. Idle with vacuum line connected will vary, depending on your engine condition and factors like cam timing, but will be in the mid-to-high 30's.
Engine running with vac line disconnected and plugged: 42 +/-2 psi. Key on/engine off will show slightly less due to only battery voltage being applied to the pump. Idle with vacuum line connected will vary, depending on your engine condition and factors like cam timing, but will be in the mid-to-high 30's.
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