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Thread: 2 bar tune for Turbo LT1 F-body possible with '93 ECM? DA3

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  1. #1
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    2 bar tune for Turbo LT1 F-body possible with '93 ECM? DA3

    Trying to decided to take the plunge on a 76mm On3 turbo for my LT1/T56 swapped third gen F body.

    I'm shooting for a low-boost 5-7psi for a fun street car. Motor is stock lower end, ported heads, 224/224 cam.

    I have the unique to '93 LT1 ECM, and have tuned it myself with TunerPro RT and the Moates setup. I'm currently running dedicated open loop, and feel pretty solid with that.

    What I'm wondering is, can I install a 2 bar Map sensor and make the stock ECM work for this turbo application? Is there another GM ECM that would work better for this?

    Is there a way to make TunerPro show 0-200kPa like the sensor will be reading, or do I just need to do the conversion by hand (50kPA on screen = 100kPa real life)?

    I'm assuming I would need to "truncate" the VE and timing tables from 0-100kPa, then be very cautious going from 100-200kPa and sneak up on a safe tune little by little.

    Do any of these assumptions ring true, or am I asking for trouble doing this?

    I know that's a lot of questions in one post, sure would appreciate any feedback out there. Thank you!
    J. Moen
    91 Camaro - NASA American Iron Road Racer #91 "The Menace", carb'd 350, FloTek heads, "because racecar"
    91 Camaro RS - '93 LT1 /T56 swap, 224/224, 60lb Siemens, garage ported heads, VS racing 78/75 turbo, Intercooled

  2. #2
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    No, the LT1 PCM does not and as far as I have been able to find, can not support the 2-bar map sensor. It was a similar situation with the P66 6-cylinder PCM and I thought after doing that one, that the $EE PCM could be done too-but apparently there is some trickery needed that doesn't work.

  3. #3
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    I thought I read though where a 2 bar MAP sensor voltage range is still 0-5V, but instead of 0-100kPa, its now 0-200kPa, unless I'm totally confused. So the ECM shouldn't care, since that fits into its range?
    J. Moen
    91 Camaro - NASA American Iron Road Racer #91 "The Menace", carb'd 350, FloTek heads, "because racecar"
    91 Camaro RS - '93 LT1 /T56 swap, 224/224, 60lb Siemens, garage ported heads, VS racing 78/75 turbo, Intercooled

  4. #4
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    Happened upon this thread too.
    http://www.gearhead-efi.com/Fuel-Inj...Turbo-LT1-Tune

    So apparently he was able to do it. But on $EE which would be a flashable PCM in the 94-96 F Body etc.. Not really sure how different that is from $DA3. I'm cautiously optimistic . . . .
    J. Moen
    91 Camaro - NASA American Iron Road Racer #91 "The Menace", carb'd 350, FloTek heads, "because racecar"
    91 Camaro RS - '93 LT1 /T56 swap, 224/224, 60lb Siemens, garage ported heads, VS racing 78/75 turbo, Intercooled

  5. #5
    Not hard. Just remember to scale everything.

  6. #6
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    Cool I think I’ll get a 2 bar map and try to set everything up NA to prove to myself I can do it!
    J. Moen
    91 Camaro - NASA American Iron Road Racer #91 "The Menace", carb'd 350, FloTek heads, "because racecar"
    91 Camaro RS - '93 LT1 /T56 swap, 224/224, 60lb Siemens, garage ported heads, VS racing 78/75 turbo, Intercooled

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