awd-rwd racer

iTrader: (16)

i had 60# injectors, 300lph pump. 10-11psi and i was at 110 % duty cycle only injectors. so i bought a new set of 80#'s which at 60psi flow almost 1000cc. and with everything being the same except for the injectors my duty cycle is about the same. could it be my pump just cant keep up? any thoughts/ideas?

both sets of injectors were siemen dekas and my fuel pump is a stock toyota supra tt 300lph pump.

thanks!

Cam72aro

iTrader: (28)

Definitely pump in my opinion. You didn't say what feed line size, but my guess the 300lph pump isn't keeping up. I would find a way to upgrade pump size. The choice to go with the 80's still wasn't a bad choice, but I would see what you can do to get more pump in there.

Old Geezer

iTrader: (3)

What does the fuel pressure do, when at 10-11psi boost?
Boost referenced?

Exidous

iTrader: (11)

^....need to check fuel pressure for sure. It is probably the pump but could be a line restriction as well.

stevieturbo

No useful info.

Log fuel pressure, log AFR's, log injector pulse widths.

Unless you now what fuel pressure is doing, nobody can answer. You make no reference to AFR's so again, nobody can say what might be happening. Nor whether you are asking more or less of any injectors.

duty cycle as a number isnt really important as long as you dont run the injectors flat out.

And if you havent changed anything other than the injectors, of course DC's will be the same, but there should be a ton more fuel going through the engine

JoeNova

I highly doubt its a line restriction

rotary1307cc

iTrader: (5)

This.