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Top 2GNT Technical Turbo/Nitrous Tech topic #20532
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Subject: "fuel pressure w/ larger injectors" Previous topic | Next topic
RyaN95i4Apr-25-02 07:55 AM
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#20532, "fuel pressure w/ larger injectors"




          

just out of curiousty, to compare with my setup, what fp are you guys running w/ larger injectors?

right now, mine are 315 and about 62psi @ 8lbs of boost

seems low to me, what are your guys numbers like?

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

  

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jamesmanApr-25-02 01:45 PM
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#20533, "RE: fuel pressure w/ larger injectors"
In response to Reply # 0


          

um yes that is low, when i was runnin 315's i was running 100 psi at 9 psi boost, if you use the fuel injector flow rate calculations and a .80 duty cycle you should be near the proper flow rates, but running at 65 psi is pretty dang low!
lates
james

Rest In Peace Heidi Doggy

  

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ModeratorCorbinApr-25-02 05:11 PM
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#20534, "RE: fuel pressure w/ larger injectors"
In response to Reply # 1


          

If you are using a S-AFC,you can assume a DC of 0.80 or whatever. If you aren't using a S-AFC, you must assume a DC of 1. The stock ECU will run the injectors near 100% if you don't trick into doing otherwise (S-AFC). The assumed DC will make a big difference in the fuel pressure that you aim for. I just wanted to state that, in case either of you didn't take that into account.


Corbin

'95 ESI-T
HRC+FMIC+ETC...



Gimme fuel...Gimme fire...Gimme that which I desire

Corbin
'97 GSX dressed like a '95 ESi

  

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RyaN95i4Apr-25-02 07:41 PM
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#20535, "RE: fuel pressure w/ larger injectors"
In response to Reply # 1




          

damn dude, 100psi??? i ran 100psi on stock injectors, thats way too high

i dont have a safc, so im basing duty cycle at nearly 100%

also, my a/f still shows 1.0v and egts are 1500-1520 upto 90 or so on a WOT run

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

  

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RyaN95i4Apr-26-02 08:40 AM
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#20536, "RE: fuel pressure w/ larger injectors"
In response to Reply # 3




          

no one else has run bigger injectors? im just trying to compare what everyone else is running to what im doing. my pressure seems low, but egts are fine and a/f says im way too rich (1.0v :O )

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

  

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RyaN95i4Apr-26-02 06:56 PM
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#20537, "RE: fuel pressure w/ larger injectors"
In response to Reply # 4




          

used your page corbin, the example helped a lot. figured i need ~70psi of fp w/ 315cc injectors @ 9psi of boost, figuring a 100% duty cycle since i have no SAFC

95 Avenger
ATX->MTX Swap
Holset HX40 @ 26 psi

  

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