Can i simply increase my fuel pressure to increase injector output?
07-05-2011, 01:42 PM
#1
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Can i simply increase my fuel pressure to increase injector output? As the title states. Could i just turn up the psi?
Example:
ls3 inj is 42lbs at 58.9
can i turn the boost up to 75psi and make them 47.35lbs w/o any issuses?
Example:
ls3 inj is 42lbs at 58.9
can i turn the boost up to 75psi and make them 47.35lbs w/o any issuses?
07-05-2011, 01:55 PM
#2
If the rest of your fuel system can keep up, sure. Fuel pumps do flow less the higher pressure they run.
Keep in mind, that your base fuel pressure is going to be high and you injectors will flow more in all vacuum ranges. You'll need to be able to have enough control over the injectors than you can pull fuel at idle and cruise.
Most high-boost FI applications see 75psi and higher under full boost, but they use a rising rate FPR, so their base fuel pressure is much lower.
Keep in mind, that your base fuel pressure is going to be high and you injectors will flow more in all vacuum ranges. You'll need to be able to have enough control over the injectors than you can pull fuel at idle and cruise.
Most high-boost FI applications see 75psi and higher under full boost, but they use a rising rate FPR, so their base fuel pressure is much lower.
07-06-2011, 04:04 PM
#6
The stock LS3/LS7 injector should flow enough @ 75psi to support up to 700hp...but remember that the higher pressure you run a fuel pump, the lower it flows.
Getting close to 80 psi, many OE pumps (and some aftermarket) take a nose dive.
Just to give you an example of the different in flow at the two pressures, our DW301 flows 275LPH @ 60psi and flows 240LPH @ 75psi. That 35LPH ~ an extra 7lb for each injector.
I don't know what kind of power you are looking to make, but if it is more than 650whp, I'd look at stepping up to a 42lb (@43.5psi) injector and then you'd be able to lower your fuel pressure back down and make your fuel pump happy, too.
Getting close to 80 psi, many OE pumps (and some aftermarket) take a nose dive.
Just to give you an example of the different in flow at the two pressures, our DW301 flows 275LPH @ 60psi and flows 240LPH @ 75psi. That 35LPH ~ an extra 7lb for each injector.
I don't know what kind of power you are looking to make, but if it is more than 650whp, I'd look at stepping up to a 42lb (@43.5psi) injector and then you'd be able to lower your fuel pressure back down and make your fuel pump happy, too.
Last edited by deatschwerks; 07-07-2011 at 10:14 AM.
