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Thread: Flex fuel OS for LS1 PCM

  1. #11
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    Ok so those are a 512k is the other VZ one a 411?

  2. #12
    Lifetime Member Tre-Cool's Avatar
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    So ls1a ecu's were pre 1999.
    ls1b ecompases both P01/P59 ecu's.

    Pre99 & P01 is 512kb
    P59 is 1024kb

    P01 is blue/red connector
    P59 is Blue/Green connector

    Apart from some minor pin changes and slightly different shape on the green connector, it's almost plug/plug between the 2. You can file down green the connector plug and away you go

  3. #13
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    Ok awesome so are the P59 a simple plug and play? Or do some pins need to be moved around

  4. #14
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    There was a huge stink over on the Corvette forums about this and supposedly 1 dude had it figured out but wasn't talking. I need to update my software to view a ctz, but are there any weird tricks or asspain other than a full flash of that tune onto my P59 in my 2004 Z06? I picked up a blower for it and really want flex fuel ability.
    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.

  5. #15
    Joe (Moderator) joecar's Avatar
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    There is a current thread on LS1tech.com regarding this, let me see if I can find it...

  6. #16
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    I think I saw it too. I'd found more info on the swap but apparently not on the Corvette Forum because when I checked back there I couldn't find what I'd remembered reading.
    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.

  7. #17
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    So basically we need to run a vz ls1 ecu but then we have the problem of dbw

  8. #18
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    Quote Originally Posted by JCA View Post
    So basically we need to run a vz ls1 ecu but then we have the problem of dbw
    I reckon the Yukon is still cable that uses this PCM so should be able to use that OS

  9. #19
    Lifetime Member Tre-Cool's Avatar
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    Quote Originally Posted by JCA View Post
    So basically we need to run a vz ls1 ecu but then we have the problem of dbw
    no. u still keep cable throttle body.

  10. #20
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    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.

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