Turbosl2

Right now i have 60lb inj, D1sc @ 12psi, stock in tank pump with a external T-rex. Car is going lean past 4300rpm, only made 443rwhp on the p1sc @ 9psi then dropped off fast. I need to spend most of my $$ in other places, i have a 255lph in tank pump sitting on the bench, should i install this and the T-rex (i think its 255lph or so (66gph)or should i just install the 255lph? I plan to build a fuel system for the car in the future. Will there be any benefit from the 2 pumps. Wont the flowrate still only be as good as the last pump closest to the engine?

I think the t-rex only flows that 50gph at 70psi, my fuel pressure is at 40psi. It seems to flow around 66gph or 250-255lph at 40psi
The Walboro in tank i think at 40psi flows about66pgh or 250-255lph. Should i run them both or just one. They both seem to have the same flowrates. Maybe its the lines and rails that i need to work on, since i wont seem to get anymore flow from the pump
Thanks

mjr46

60 lbs injectors is a little overkill for 12 lbs of boost......how wild is the rest of the build on the motor to need 60 lbs injectors

92cobra

+1 on wanting to know what else is done to need 60lbers. As far as running the 2 pumps, I think you should just go with the 255lph in tank and be done. But thats just me. I like simplicity and think that the intake 255lph will be plenty for you. But please, dont just take my word for it, take mjr's haha.

Turbosl2

The motor is very radical (6-8inch vacume at idle). D1SC at 12psi, 4340 forged rotating assembly, 2618 pistions, 9.5:1, Afr 185heads, cometic HG, 331 CID, Flowtech custom cam, 288dur, 594lift, 2 core IC/ Sct BA2800, 60lb inj AODE trans with 3200stall. I know a few other guys that are at 90% DC with there 60lb inj and almost maxing there MAF out to around 3000kg/hr. The only reason I never made over 500rwhp is because we shut it down at 5000rpm due to the pump. With a peek HP in the 4000 rpms and a centrifugal blower, it should make more HP almost at peak RPM. Plus since it was leaning out the EEC was pulling timing. I know that 60s are not to large. Question is is the pump and factory fuel lines to small? PSI of boost is not a relevant way of knowing if injectors are to large. You have to take a look at the MAF and DC of injectors. You cant relate pressure to flow rate. 12psi with a D1sc is diff then 12psi with a P1SC as it is with a F1. Garden hose/ fire hose principal.
I was just unsure if people are using 2 pumps and why. It cant flow more then the pump closest to the engine. The T-rex is just a TAD (4gph) smaller then a 255 in tank. They both flow roughly 255 but the intank seems that the flow does not drop off as fast as the T-rex. Since I would be at 52psi of fuel pressure under boost comparing curves they are relatively the same, except for the high pressure 255 in tank.
Basically is the only reason to run 2 pumps is for redundancy or to try to ease the load on the other pump?