Quote:
Originally Posted by carbuff
I'm using the 'relay' from the Holley HP EFI kit, which supposedly will source 10A. I do have 12 or 14ga wire, I don't recall which at the moment. I unfortunately do not have a good way to measure the actual voltage at the pump itself, but if it requires 12A, then it's very possible that I have a limitation on the available current. I did not run an extra relay for the pump itself, since I was under the impression that the HP EFI could source it. That may be my mistake.
If I'm going to dig back into this wiring, then it may be a good time for me to go ahead and install your PWM controller instead of just a relay. I don't think it was available when I made this original purchase, which is why I don't have one now...
I will contact you via PM about acquiring one...
Thanx again!
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Hey carbuff, I was directed to this thread by a community member, I work for a fuel pump and injector manufacturer and was actually in the process of flow testing the stock LS3 pump from the 5th Gen Camaro.
From 30psi up to 100psi, it was using 10.6-15.2 amps @ 13.5 volts. If I'm reading your first sentence right, you are over extending the Holley EFI relay.
From the looks of it, the pumps is actually quite good. My numbers are showing for 675hp at the crank you'll need around 195LPH of fuel from the pump. At 60psi, the LS3 pump was putting out 220LPH by our testing equipment.
As Carl pointed out, you'll need around at least 45# injectors to keep the IDC's in the 80's with 675hp...and also a 44# injector at 58 psi will yield ~52#.
If your current injectors are essentially going static, I could see that being a source of your fuel pressure drop, as well.