Quote:
Originally Posted by jay04
I am running a after market FPR. I didn't turn the fuel pressure up. Was I suppose to? I am gonna turn the fuel pressure up so it can compensate.
Let me know how it turn out today. Do you have a wideband? If you don't how are you gonna know how much to increase the fuel pressure by?
Jay
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My best run today was 13.089 @ 105.30. Keep in mind that is in a spyder with a race weight of 4320 lbs with me driving.
To set my fuel pressure, I did some calculation based on using a 50 / 50 mix of 93 octane and E-85. For 100% E-85 you would need around 30% more fuel, so for a 50 / 50 mix you would need around 15% increased fuel. I used a fuel flow calculator to determin that an increase to 55 psi base fuel pressure would give me around the fuel flow needed, with any other adjustments made by the ECU. Since I don't have the fuel pump hot wired, it will only push around 50 psi at idle on the low voltage feed. I turned the screw in a couple more turns after pressure stopped rising and called it "good enough"
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Keith