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  1. #1
    Fuel Injected!
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    4A-GZE conversion

    has anyone run a toyota 4A-GZE (89 MR2, 1.6l 4 cylinder supercharged) on a GM ecm? I'm looking for a MAF based option if one is available.

  2. #2
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ericjon262 View Post
    has anyone run a toyota 4A-GZE (89 MR2, 1.6l 4 cylinder supercharged) on a GM ecm? I'm looking for a MAF based option if one is available.
    I do not have personal experience with a supercharged Toyota.

    One possible option for an OBD1 GM computer (with MAF) would be 16183247, which was mostly used for the 94 - 95 Buick V6 supercharged vehicles. Additional information is linked here: http://www.gearhead-efi.com/Fuel-Inj...47-16197428-5b

    Another possibility (without MAF) would be to install a 2 bar MAP Sensor on OBD1 computer (16197427) so the 0v ~ 5v MAP Sensor will be "Tricked" into providing a voltage with boost.

    dave w
    Last edited by dave w; 11-23-2014 at 06:44 PM.

  3. #3
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    I'm trying to stay away from speed density at the moment, I'd also be worried about cam and crank sensor matching as the 4A doesn't use either. a crank trigger is easy enough to add though. cam sensor would be a bit of a PITA to add...

  4. #4
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    Why not use speed density? There are some v8 MAF applications which could be converted to 4 cyl use with some effort.

    $58 from Syclone / turbo Sunbird would likely do the job with speed density. It's working on my 22RTE. The 22RTE and 22RE supply a crank signal through the distributor. How does the 4A ecu get an rpm signal?

  5. #5
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    Quote Originally Posted by 1project2many View Post
    Why not use speed density? There are some v8 MAF applications which could be converted to 4 cyl use with some effort.

    $58 from Syclone / turbo Sunbird would likely do the job with speed density. It's working on my 22RTE. The 22RTE and 22RE supply a crank signal through the distributor. How does the 4A ecu get an rpm signal?

    not sure yet where the crank signal comes from, I assume the distributor, but not 100% sure. Typically MAF will respond better to slight modifications than SD once a tune is created. it's a buddies car, and the stock ECU's aren't tuneable, there's some kind of hack job piggyback thing on it now, and it would be nice to delete all of that and have an ECM control it strait up.

    what real benefit would he see going SD? just more accurate fueling/spark control?

  6. #6
    Super Moderator dave w's Avatar
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    Quote Originally Posted by ericjon262 View Post
    not sure yet where the crank signal comes from, I assume the distributor, but not 100% sure. Typically MAF will respond better to slight modifications than SD once a tune is created. it's a buddies car, and the stock ECU's aren't tuneable, there's some kind of hack job piggyback thing on it now, and it would be nice to delete all of that and have an ECM control it strait up.

    what real benefit would he see going SD? just more accurate fueling/spark control?
    It comes down to one simple fact, the more you know about tuning an EFI system, more performance you can achieve. Anything and everything else is 100% hear-say information! Do some homework, leave everyone else looking at your tail lights!

    Case in point, MAF has be added to the 16197427 TBI PCM. Post # 12.

    Edit with the link:http://www.gearhead-efi.com/Fuel-Inj...Information-0D


    dave w
    Last edited by dave w; 11-23-2014 at 10:30 PM.

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