adj fuel pressure regulator question
12-05-2006, 10:59 PM
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adj fuel pressure regulator question i bought a brand new holley adj. fuel pressure regulator, but nowhere does it say wether it is preset at 0psi, or 43 psi (close to stock).... does anyone know what they typically come set at?
12-06-2006, 09:54 AM
#4
Originally Posted by moserman
i bought a brand new holley adj. fuel pressure regulator, but nowhere does it say wether it is preset at 0psi, or 43 psi (close to stock).... does anyone know what they typically come set at?
You wasted your money there. I would not even use it. If you do use it, however, most LT1s we see here stock have 45 to 47 psi, running with the vacuum hose off. Ignore the people that tell you to set it to 42 or 43 psi.
12-08-2006, 12:42 AM
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ive been told to run with a 60psi setup with 30lb injectors, and i have a gauge already but its quite fluctuant and you cant really be too precise with it, i just didnt know if they came preset or not.
12-08-2006, 02:05 AM
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Originally Posted by moserman
ive been told to run with a 60psi setup with 30lb injectors, and i have a gauge already but its quite fluctuant and you cant really be too precise with it, i just didnt know if they came preset or not.
Does 60psi sound to high to anybody else???
12-08-2006, 09:02 AM
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i thought the same but i asked a person and he said that @ 60psi on a 30lb injector, it would be the equivelant to running a 42lb injector, so i guess he was being legit.
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12-08-2006, 10:23 AM
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Originally Posted by Injuneer
The SVO's are flow rated at 2.7bar = 39.15psi
To get the new flow rate at a new pressure (say 3bar = 43.5psi), you need to calculate the square root of the pressure ratio.... example:
Pressure ratio = 43.5 / 39.15 = 1.1111
1.1111^0.50 = 1.0541
New flow rate = 30 x 1.0541 = 31.62 #/Hr
You may also find that the flow ratings are "nominal".... the stockers for example, are quoted as 24 #/Hr, but they are programmed at 24.9 #/Hr.
To get the new flow rate at a new pressure (say 3bar = 43.5psi), you need to calculate the square root of the pressure ratio.... example:
Pressure ratio = 43.5 / 39.15 = 1.1111
1.1111^0.50 = 1.0541
New flow rate = 30 x 1.0541 = 31.62 #/Hr
You may also find that the flow ratings are "nominal".... the stockers for example, are quoted as 24 #/Hr, but they are programmed at 24.9 #/Hr.
12-08-2006, 10:45 AM
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Originally Posted by camar0corey
so how much pressure should it have with the hose on?? I have around 41-42 at wot according to the autometer gauge.
So whats the deal, Holley pressure regulators not good or something??
So whats the deal, Holley pressure regulators not good or something??
12-08-2006, 11:49 AM
#13
Originally Posted by camar0corey
so how much pressure should it have with the hose on?? I have around 41-42 at wot according to the autometer gauge.
So whats the deal, Holley pressure regulators not good or something??
So whats the deal, Holley pressure regulators not good or something??
You should have the same @ WOT as at idle with the hose off.
Adjustable regulators are just not needed. Tuning your fueling with one is just a hack. Higher fuel pressures are hard on pumps, and the main reason why LS1 vehicles and Vortec trucks (which run about 60 psi) have so many pump failures.
Use a stock regulator and buy the correct size injectors.
