yea, your right, w the rising rate pressure regulator, couldnt I lower the fuel pressure in a vacuum? or should I just throw 30 or 39 lbs injectors in? I checked for everything, boost leak, vaccuum leaks....i dont know why its so rich at idle and out of boost, its driving me nuts

 

with an adjustable fpr, you just set base pressure, and it increases fuel pressure in relation to boost. usually 1:1

going to smaller injectors will pull fuel, but may not supply enough under boost...

 

42lb injectors will support about 450hp at the crank.

 

Base fuel pressure is very important. If you lower the base pressure (at idle) the engine may have a hard time idling smoothly, as the atomization is poor. Being able to see a log of certain parameters would be ideal: vacuum/boost, fuel pressure, engine rpm, throttle position, vehicle speed, O2 voltage (or A/F ratios) open loop and closed loop percentage values, and injector duty cycles. Logs of these values help determine what is causing the issue. Band-ade fixes don't solve problems, they can make them worse. With an adjustable regulator, set your base pressure to what the factory recommends. The reason for a 1:1 regulator is so that under boost, the pressure in the intake manifold does not exceed or come close to the fuel pressure. Otherwise, the fuel wouldn't spray.

 

so i should save some money for a data logger? recommend any?

 

I use EVOscan on my Eclipse.

If you are using hemifever, you are tuning on the SCT programmer. If they have a datalogger, that is what I would go with.

 

no i think the sct doesnt datalog

 

SCT has data logging. You might want to send hemifever an email

 

for our trucks? i read alot of places they dont, why would he not mention it to me and we sit here struggling for the last 3 weeks with my ****ty a/f ratio?

 

maybe its a feature he is unaware of. or it just doesnt work with our ECu's... its certainly worth looking into though.