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Thread: '06/'00 Vortec VCM 5400 RPM Limitation

  1. #1
    Tuner in Training
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    '06/'00 Vortec VCM 5400 RPM Limitation

    Here is something that may help guys with Vortec trucks, that don't want to have to change to an LS1 style box. He runs a 4.3L S10. George is one of my NHRA stock Eliminator customers, from down in Louisiana:

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    If you don't have the distributer right in the right spot it will act like a rev limiter. http://www.youtube.com/watch?v=OsE9OSm2UdE This was when I was trying to figure the problem out. You can hear what sounds like a rev limiter around 5400rpm. http://www.youtube.com/watch?v=PBM4SjJzZOE Here is me shifting at 6000 rpm with no problem. You have to grind off the lockdown tab and make it adjustable. I made a degree plate for the top of the distributer cap in 1 degree amounts. I then retarded the distributer a little at a time untill the problem went away.

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    George Roussel Jr. 4262 1996 S10 p-q/sa

    He has not checked the retard on a scan tool, so I don't have any numbers for that. He just retarded the distributor (which houses the cam position sensor) until it went away.

    Hope this helps somebody. George said to go ahead and post this.

  2. #2
    Quote Originally Posted by Ed Wright View Post
    Here is something that may help guys with Vortec trucks, that don't want to have to change to an LS1 style box. He runs a 4.3L S10. George is one of my NHRA stock Eliminator customers, from down in Louisiana:

    _________________________



    If you don't have the distributer right in the right spot it will act like a rev limiter. http://www.youtube.com/watch?v=OsE9OSm2UdE This was when I was trying to figure the problem out. You can hear what sounds like a rev limiter around 5400rpm. http://www.youtube.com/watch?v=PBM4SjJzZOE Here is me shifting at 6000 rpm with no problem. You have to grind off the lockdown tab and make it adjustable. I made a degree plate for the top of the distributer cap in 1 degree amounts. I then retarded the distributer a little at a time untill the problem went away.

    __________________
    George Roussel Jr. 4262 1996 S10 p-q/sa

    He has not checked the retard on a scan tool, so I don't have any numbers for that. He just retarded the distributor (which houses the cam position sensor) until it went away.

    Hope this helps somebody. George said to go ahead and post this.

    I've had one of the 4.3L's over 6k, but haven't tested one of the L31's over 6k with changing the rev limiter with HPT yet.

  3. #3
    HP Tuners Support
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    Bill@HPTuners's Avatar
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    Yeah I had my 98 S-10 to over 6300 rpms, at the track constantly http://www.thetuningdoctor.com/Videos/13sectruckrun.avi
    It doesn't have to be perfect, it just needs to be done in two weeks...

    A wise man once said "google it"

  4. #4
    Advanced Tuner Programmer's Avatar
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    I think Ed meant '96-'00 Vortec Black VCM...there's been a 5900-6000 RPM limitation that has been bugging people...hence they feel the need to upgrade to the '411 ECM.