406chvycamaro

iTrader: (7)

I'm just about done with my procharged 408 build and I'm curious what fuel pressure to run? My fuel system consists of dual 450 pumps, id1700 injectors, fore f2i boost referenced fuel pressure regulator, and 10an feed line. Ill be using E-85 fuel. Looking to run 18lbs on the procharger. Any help would be greatly appreciated. Thanks in advance.

3 window

iTrader: (1)

Run whatever the injectors are rated at and use the boost reference line to increase with boost. If duty cycle is getting too high, bump up the base pressure.

ls1_e36

looking to hear answer too

white01ss

iTrader: (37)

Run the lowest pressure the car needs to keep the IDC < 80%. Many benefits to lower pressure. Pumps don't have to work as hard and don't heat up the fuel as fast. Lower pressure makes your injector more shoot less fuel at lower pulse rates so idle and cruise tuning is controlled better. Downside is with lower pressure there's less fuel available for WOT so injector sizing and IDC at WOT are most important so you kind of have to work backwards from there.

I'm running 43 psi base pressure with a boost referenced FPR. But kind of running out of injector now with a peak IDC of 92% so I could probably use a bit more FP or go to a bigger injector. Problem is if you change the FP then you have to retune all the fueling maps which is a PITA.

ddnspider

iTrader: (26)

Most either run factory 4 bar of fuel, or drop to 3 bar of fuel depending on the fuel setup/system.