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What "tune" changes are needed to run lower base fuel pressure?
Did injector swap from 1000cc to 1500cc very recently.
I have the new Greg Banish supplied injector data entered and ECU reflashed, and car starts and runs fine, BUT...
I want to run lower base fuel pressure...43psi rather than 58psi.
Aside from changing IFR numbers, what else will I need to modify?
Any other tables? I assume retuning VE will be needed, but can't really find an answer as to what else, if anything, needs to be done.
To CLARIFY...
This is a TURBO CAR, 2000 Trans Am
Aftermarket everything fuel related, except gas tank...
Pressure is determined by the pressure regulator, which is fixed.
C'mon now.
I didn't think clarification would be needed, but added it in original post.
Car is a 2000 Trans Am
Aside from gas tank itself, EVERYTHING fuel related is aftermarket, including (boost sensitive) fuel pressure regulator, which I want to use to lower the base fuel pressure.
REASON: I do not think I "NEED" 58psi of base fuel pressure, and read that the 450lph pumps, like I have, do not like the higher fuel pressure it will see with boost...
Just trying to see what else, if anything, needs to be adjusted/modified?
I know the Injector Flow Rate vs. kPa will (should??) need modifying. It's already set up for the 1:1 regulator, using the number provided by Greg Banish.
If the tune was well sorted, it should track pretty well after entering the new flow rate.
Might have to rub on the VE a bit
That is/was what I hoped for.
It was spot on with the old 1000cc injectors, using narrowbands & STFT's for cruise and idle, and wideband for everything else.
I just wanted to make sure I didn't have to mess around with any of the other parameters.
That is/was what I hoped for.
It was spot on with the old 1000cc injectors, using narrowbands & STFT's for cruise and idle, and wideband for everything else.
I just wanted to make sure I didn't have to mess around with any of the other parameters.
IFR is really the 1 impacted by FP. Some of the other parameters can vary slightly, but as Ron said, a tweak to the VE will resolve that as far as you're concerned.
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What "tune" changes are needed to run lower base fuel pressure? 
