Fuel management
Posted: Jun 15, 2007 11:28 PM
I decided that I should try to stick my set of 24lb injectors back in this weekend to accomodate the boost increase I'm hoping to get away with by installing colder plugs and a stronger clutch. The problem I've had with them is that I cant take enough fuel out to keep it running at idle or anywhere else without the ecu ignoring the MAF input.
I thought if I could lower the static fuel pressure I could make them work. Since I'm already using a BEGi 2025 RRFPR, I thought I could probably run that to control both the static pressure and the rising rate function under boost. The idea was to use the center screw to set the static pressure, while the boost enrichment would still function as before. I figured moving the check valve to the signal line would keep it from going super rich during boost onset. If it doesn't see vacuum, it would function just like the Bosch regulator with the vacuum signal line disconnected.
So I got an old Bosch 2.5 bar FPR and stuck a drill in through the port from the fuel rail. That effectively turns the FPR into a fitting. And thats about all there was to it other than the adjustments to the center screw and the check valve relocation to keep vacuum out of the RRFPR.
I don't have a fuel pressure gauge, so I don't know where its at, but I can run it lean at idle even with 24lb'ers that would choke and die in a cloud of black smoke at 2.5 bar. I imagine its in the area of 20-25 psi. And its fully adjustable. Pretty awesome...
I thought if I could lower the static fuel pressure I could make them work. Since I'm already using a BEGi 2025 RRFPR, I thought I could probably run that to control both the static pressure and the rising rate function under boost. The idea was to use the center screw to set the static pressure, while the boost enrichment would still function as before. I figured moving the check valve to the signal line would keep it from going super rich during boost onset. If it doesn't see vacuum, it would function just like the Bosch regulator with the vacuum signal line disconnected.
So I got an old Bosch 2.5 bar FPR and stuck a drill in through the port from the fuel rail. That effectively turns the FPR into a fitting. And thats about all there was to it other than the adjustments to the center screw and the check valve relocation to keep vacuum out of the RRFPR.
I don't have a fuel pressure gauge, so I don't know where its at, but I can run it lean at idle even with 24lb'ers that would choke and die in a cloud of black smoke at 2.5 bar. I imagine its in the area of 20-25 psi. And its fully adjustable. Pretty awesome...