900-1100HP guys... what fuel psi y'all run?
08-10-2007, 02:05 PM
#1
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900-1100HP guys... what fuel psi y'all run? I have 65lbs injectors (@ 90% duty cycle) w/ fuel psi @ 60psi... how much higher can i take this fuel psi? I going to be running 3lbs more boost on the same fuel system. Wondering if I can take the fuel psi to 65-70 w/o getting into trouble???
Fast fuel rails
Fast 1200hp fuel pump system
65lbs injectors
MS109 fuel
Fast fuel rails
Fast 1200hp fuel pump system
65lbs injectors
MS109 fuel
08-11-2007, 01:03 AM
#3
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Originally Posted by MrDude_1
is your fuel pressure still atmospheric referenced or is it manifold pressure referenced?
08-11-2007, 02:52 AM
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Depends on your pump and fuel lines. If a single 044, then perhaps 5bar - but may lean out if the pump heats up. They are rated at 3.5bar these pump.
If dual 044 and -10 supply lines, then as high as 6bar or more.
If dual 044 and -10 supply lines, then as high as 6bar or more.
08-11-2007, 12:36 PM
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funds are comin down to the wire... just wanted to see how far i can stretch the fuel psi...
my fuel system is pretty stout... good lines, fuel pump, the works... i still run the factory pcm (i know i need bs3) and RC racing makes 75lbs injectors which work with factory settings... i hate to resort to them if i can up the fuel psi 8psi or so and up the injector duty cycle to 95% to compensate for the 3 extra pounds of boost...
thanks for your help y'all!
J
my fuel system is pretty stout... good lines, fuel pump, the works... i still run the factory pcm (i know i need bs3) and RC racing makes 75lbs injectors which work with factory settings... i hate to resort to them if i can up the fuel psi 8psi or so and up the injector duty cycle to 95% to compensate for the 3 extra pounds of boost...
thanks for your help y'all!
J
08-11-2007, 06:23 PM
#6
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Originally Posted by MNR-0
Depends on your pump and fuel lines. If a single 044, then perhaps 5bar - but may lean out if the pump heats up. They are rated at 3.5bar these pump.
If dual 044 and -10 supply lines, then as high as 6bar or more.
If dual 044 and -10 supply lines, then as high as 6bar or more.
044 maintains flow to in excess of 7 bar pressure, which is well over 100psi. It only starts to drop a little around 8 bar.
And using 1 pump or 2 wont make any difference to pressure ability. 2 pumps will simply flow more.
FWIW, when I was using the 60lb Siemens ( Mototrons ) I ran 4.5 bar base pressure, 66psi with boost reference.
Duty cycles were pretty high, hence I switched to RC 73lb's At low rpm's, I needed to use 4.25 bar to maintain the same AFR's as the Mototrons....go figure.
Although it has given me a bit more fuel at the top end. The RC injectors were not as easy to tune as the Siemens, but they are working fine now.
Im using a pair of 044's, 73lb inj, 1/2 hardline to front, 3/8 hardline return with Aero rails.
My fuel pressure is always rock solid....no idea of power, but Id say its a good bit in excess of 800rwhp
08-11-2007, 07:59 PM
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Originally Posted by stevieturbo
044 maintains flow to in excess of 7 bar pressure, which is well over 100psi. It only starts to drop a little around 8 bar.
And using 1 pump or 2 wont make any difference to pressure ability. 2 pumps will simply flow more.
FWIW, when I was using the 60lb Siemens ( Mototrons ) I ran 4.5 bar base pressure, 66psi with boost reference.
Duty cycles were pretty high, hence I switched to RC 73lb's At low rpm's, I needed to use 4.25 bar to maintain the same AFR's as the Mototrons....go figure.
Although it has given me a bit more fuel at the top end. The RC injectors were not as easy to tune as the Siemens, but they are working fine now.
Im using a pair of 044's, 73lb inj, 1/2 hardline to front, 3/8 hardline return with Aero rails.
My fuel pressure is always rock solid....no idea of power, but Id say its a good bit in excess of 800rwhp
And using 1 pump or 2 wont make any difference to pressure ability. 2 pumps will simply flow more.
FWIW, when I was using the 60lb Siemens ( Mototrons ) I ran 4.5 bar base pressure, 66psi with boost reference.
Duty cycles were pretty high, hence I switched to RC 73lb's At low rpm's, I needed to use 4.25 bar to maintain the same AFR's as the Mototrons....go figure.
Although it has given me a bit more fuel at the top end. The RC injectors were not as easy to tune as the Siemens, but they are working fine now.
Im using a pair of 044's, 73lb inj, 1/2 hardline to front, 3/8 hardline return with Aero rails.
My fuel pressure is always rock solid....no idea of power, but Id say its a good bit in excess of 800rwhp
thanks again ya'll!!!
J
