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Thread: 1JZ VVTi into JZX91 - few questions

  1. #1
    Junior Member Grease Monkey
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    Default 1JZ VVTi into JZX91 - few questions

    Hi Guys,

    i have almost completed a JZX100 1jz vvti conversion in a JZX91 and have run into a few issues.

    has anyone ever used a dakoda digital SGI-5 to convert the speed signal for the speedo? it just doesnt want to play ball. any suggestions for a better alternative, has to convert the 16ppr reluctor signal into a 4ppr 12v square wave.
    now the 2nd issue, due to the lack of a working speedo, there is no SP1 signal so it throws code 42 - would this cause low power? i know it causes the old "3 speed auto" problem", but not sure about low power.

    pretty much when you drive it, it drives fine, but when you punch it, it makes a few psi then the turbo sounds like it spooling like crazy, but goes nowhere. i suspected the factory BOV, so i blocked it and no difference.

    the last issue is it idling low. like 500rpm.

    i have a feeling all these problems may be related. any info would be great as everything else is working fine (even the a/c!)

  2. #2
    Junior Member Automotive Encyclopaedia
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    Nov 2011
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    qld
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    1,123

    Default Re: 1JZ VVTi into JZX91 - few questions

    code 42 should not make it run bad
    if u r worried try connect the sp1 wire to an injector signal
    I have some good speedo units but abit more dearer than the Dakota ones
    pm me if u r interested
    I can set it up correctly too

  3. #3
    Junior Member Grease Monkey
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    Default Re: 1JZ VVTi into JZX91 - few questions

    pm sent mr dumbass

  4. #4
    Junior Member Grease Monkey
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    Default Re: 1JZ VVTi into JZX91 - few questions

    Well after some screwing around, i seem to have worked all the issues out.

    speedo now works, overdrive now engages, o/d button puts car in 3rd, and all ecu codes gone.

    thanks for your help guys.

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