I just orderd the aeromotive FPR and Aeromotive fuel pressure gauge. Just a couple of questions while they are on my mind. I have an exhaust with header, intake, and throttle body, just looking for a liitle extra fuel through my stock injectors. What do you guys suggest I raise the psi to? i know stock is somewhere around 40. Also how do you relieve the fuel pressure initialy, before you remove the stock APR. Any other installation tip would be appreciated as well. Thanks.
Um, I could be wrong here but unless you hav turbo, s/c, or a big shot of nitrous you should not increase your fuel through the injectors. That is not going to get you anywhere, might as well buy that little resistor you put on your AIT sensor.
In the planning stage for an all American TRD Cavalier.
so even a tiny bit more fuel won't help? I've heard a lot about the stock ecotec fuel system being restrictive. With the mods I have right now, at higher rpms it feels like my car get's lean as I get into the throttle more. full throttle actualy feels like it pulls less than 3/4 throttle.
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Um, I could be wrong here but unless you hav turbo, s/c, or a big shot of nitrous you should not increase your fuel through the injectors. That is not going to get you anywhere, might as well buy that little resistor you put on your AIT sensor.
I wouldnt give advice if I wasnt sure......
The only way to know if your going to get any power out of your set up by raising fuel pressure is if you go to a dyno and find out. On my old cavalier (check my reg) I gained about 5 HP on the dyno from propper fuel pressure adjusted using an AFPR.
I found that FOR MY SET UP, an additional 10psi of fuel gave me the biggest gain, however this was on a 2.4, you will only know for sure if you dyno it, for me I got a gain.
As far as releiving the stock lines, if you have a shreader valve on the fuel lines you can relieve the pressure that way if you dont, (I didnt) wrap everything in rags and slowly pull of the regulator. There really wont be alot of gas that comes out unless your buddy is behind the wheel turning it over
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What I plan on doing is measuring the psi on the stock fpr and then going from there. I will increase in 3 psi increments until the exhaust smells a little rich. Question: in order to get an accurate measurment, do you hook the gauge up to the shrader valve or to the vacuum line. Do you measure it with acsessories on and the engine off, or with everything on?
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What I plan on doing is measuring the psi on the stock fpr and then going from there. I will increase in 3 psi increments until the exhaust smells a little rich.
Keep in mind that if you not using a dyno or at least a wide band o2 sensor you may have some problems.
You could either foul an o2 sensor or ruin your cat doing it that way. If you foul your o2 sensors your going to have a very annoying CEL.
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Question: in order to get an accurate measurment, do you hook the gauge up to the shrader valve or to the vacuum line. Do you measure it with acsessories on and the engine off, or with everything on?
The shrader valve is fine, or what I did was tap a line directly into the fuel rail (if you want a permenant guage) Leave the vacuum line on the afpr, there is a base pressure and a wot pressure. I measured the base and the wot with the car idling in neutral.
Really you just need a base reading, the wot pressure is not (really) adjustable, on the 2.4 if I can remember the base was around 55 and wot was around 75. You only really have control over the base number so if you turn it down 10psi, you would end up with like 45 and 65 for wot.
good luck!
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