Injected Performance brings you HALTECH PLATINUM PNP STANDALONE
12-15-2009, 08:36 PM
#685
Hal, what's your take on folks (e.g. str8dum1) just bumping fuel pressure a bit (3 bar to 4 bar say) rather than upgrading injectors? I figure atomization will be better at the slightly higher pressure and it's not as though that's ridiculously dangerous pressures for the hoses, fittings, etc... I wonder if the CJM twin pump could handle it. If str8dum1 wants to run 25 psi, at 60 psi base, that would be 85 psi. That's seems really high, but 
Increasing the fuel pressure by 33% (40 to 60 psi) would result in a net power increase of only 16.5% (I believe doubling the power requires quadrupling the pressure). Perhaps that might not seem worthwhile given the added stress on the pump, but starting at the 700 whp level (1000 cc injectors), it would take you past capacity for 800...
Increasing the fuel pressure by 33% (40 to 60 psi) would result in a net power increase of only 16.5% (I believe doubling the power requires quadrupling the pressure). Perhaps that might not seem worthwhile given the added stress on the pump, but starting at the 700 whp level (1000 cc injectors), it would take you past capacity for 800...
Last edited by rcdash; 12-15-2009 at 08:44 PM.
12-16-2009, 07:57 AM
#686
Hal, what's your take on folks (e.g. str8dum1) just bumping fuel pressure a bit (3 bar to 4 bar say) rather than upgrading injectors? I figure atomization will be better at the slightly higher pressure and it's not as though that's ridiculously dangerous pressures for the hoses, fittings, etc... I wonder if the CJM twin pump could handle it. If str8dum1 wants to run 25 psi, at 60 psi base, that would be 85 psi. That's seems really high, but Increasing the fuel pressure by 33% (40 to 60 psi) would result in a net power increase of only 16.5% (I believe doubling the power requires quadrupling the pressure). Perhaps that might not seem worthwhile given the added stress on the pump, but starting at the 700 whp level (1000 cc injectors), it would take you past capacity for 800...
Increasing the fuel pressure by 33% (40 to 60 psi) would result in a net power increase of only 16.5% (I believe doubling the power requires quadrupling the pressure). Perhaps that might not seem worthwhile given the added stress on the pump, but starting at the 700 whp level (1000 cc injectors), it would take you past capacity for 800...
12-16-2009, 08:27 AM
#687
Sorry for the OT question, but that answer was enlightening - thank you. I had no idea flow and pressure were related *inversely* for the walbro. 
I don't understand it, but I'll do more research. At 0 psi how can it flow nearly 80 gallons per hour?
I don't understand it, but I'll do more research. At 0 psi how can it flow nearly 80 gallons per hour?
Last edited by rcdash; 12-16-2009 at 08:29 AM.
12-16-2009, 08:36 AM
#688
At 0psi how can the Walbro flow 80gph? Unhook all hoses from it and just let it pump freely. It would move ~80gph at 0psi.
12-16-2009, 08:45 AM
#689
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Wonder why APS sets their fuel system for 4bar out of the box and it does not have any negative effect on their system. why would it be on something like lets say CJM/AAM FRS?
12-16-2009, 09:03 AM
#690
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One issue you will see with the APS extreme fuel system, is their injectors are rated at 4 bar, but to have enough fuel to support that with twin walbros is beyond their capability. This is taken from our previous dealings. You would also have issues with their venturi design since base fuel pressure, I believe is 50psi. I can't remember exactly as this was done some time ago.
12-16-2009, 09:48 AM
#692
Don't have them handy, and I'm not sure if Precision has them. I have some proprietary values I have come up with that are working for my needs but I would hunt down the values or send the injectors off for mapping before advertising values.
12-21-2009, 06:13 AM
#694
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Nice little feature for anyone trying to go with the Racepak IQ3 dash. We just ordered two of these to come up with a nice mounting solution. They are full ABS plastic with a carbon fiber "faux" print. They aren't that expensive and I believe they run under $100 each.
Last edited by InjectedPerf; 12-21-2009 at 06:15 AM.
12-21-2009, 09:59 AM
#696
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I currently have a UTEC hardwired into my stock harness as it stands and when I get more serious with build it would be great to have VTC control and all the tuning options available through the haltech. Would I be able splice it into the stock harness/ECU in the same manor that I have with the UTEC so I can let the stock ECU run the car during closed loop and still pass OBDII? Thanks for your time!