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Thread: Which IFR calibration to use - Corvette LS6 or Bosch 28.8 ' 58 PSI

  1. #21
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    Yes, but the LS1 used less than 58psi with the same injectors. I know the early returnless systems used that filter/regulator deal out back, but around mid 03 GM got rid of the filters and changed the tank design on the Corvettes so I wonder if they went PWM then? On my 04 Z06 there is NO filter to be changed, just wait for the pump to die and the injectors to clog and deal with that.

    EDIT: I stand corrected. Looks like there is still an in-tank regulator with the FFS system. And everywhere I look, people claim the LS1 runs 58psi. When I first got my car, I remember finding a page that broke down the differences between the LS1 and LS6 (which I of course can't find) and it claimed LS6 used higher fuel pressure with the same injectors thus producing the increased fuel flow alluded to by John Juriga when the LS6 debuted. Now I feel like a dumbass for spouting off nothing.
    Last edited by Supercharged111; January 8th, 2016 at 03:10 AM.
    1998 GMC Sierra K1500 5.7/4L80E, longtubes, 411 w/COS 5, marine cam/intake, Whipple. 91 octane at 6000'.
    1997 GMC Sierra K3500 7.4/4L80E, 411 w/COS 3, Whipple, small cam.
    2004 Corvette Z06 with longtubes.

  2. #22
    Joe (Moderator) joecar's Avatar
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    I'll have to research it...

  3. #23
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    Bringing this back up. So if I have a set of the 12561462 injectors and am using them on an Fbody, can I use the data found in Greg Banish CD or take the data from a factory 01-02 Fbody tune?

  4. #24
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    Anyone???

  5. #25
    Joe (Moderator) joecar's Avatar
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    Thanks for reminding me, I have to finish researching this.

    Note to self: Injector GM PN 12561462 -> IFR from 2001-2002 F-car LS1 GM calibration, 2001-2002 Y-car LS6 GM calibration, Calibrated Success DVD.

  6. #26
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    haha, thanks Joe. Let me know what you come up with. I tend to lean on using the stock 01/02 F car data since that was from GM, but I'd rather avoid the headache if I should use something else.

  7. #27
    Joe (Moderator) joecar's Avatar
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    I have the same injectors and I've been using the 2001/2002 F-car stock IFR.

  8. #28
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    Quote Originally Posted by joecar View Post
    I have the same injectors and I've been using the 2001/2002 F-car stock IFR.
    Cool, good to know. I always get confused when the fuel pressure reg is manifold referenced vs. not if you end up with the sloped line or straight.That, and the offsets seemed different based on voltage and such.

  9. #29
    Joe (Moderator) joecar's Avatar
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    Think of it like this:

    referenced FPR has MAP added to it, so injector sees MAP at its top and bottom, so MAP cancels out, so pressure difference is constant, so IFR is flat.

  10. #30
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    Quote Originally Posted by joecar View Post
    Think of it like this:

    referenced FPR has MAP added to it, so injector sees MAP at its top and bottom, so MAP cancels out, so pressure difference is constant, so IFR is flat.
    Makes sense, and stock Fbody's have no manifold vacuum reference since the FPR is intank right? Been so long since I've played with a stock Fbody I tend to forget what stock looks like

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