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Thread: L67 swap w/ L36 PCM questions

  1. #1
    Tuner in Training
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    L67 swap w/ L36 PCM questions

    Im prepping everything for a L67 swap im doing in a guys car in a week or so.

    The car is a 95 Regal coupe, using a 99 Monte Carlo L36 harness.

    The question I have is can I easily use the L36 PCM and tune it to work 100% w/ the L67?? This will save me from extensive rewiring at the PCM connectors. I know either way I will have to add the signal wire for the SC boost control solenoid but im unsure if it will work with the L36 PCM.

    I do see on ZZPs website that they offer a PCM tune for a 99 MC thats L67 swapped and they offer to mail the .hpt file. If I pay them for the file, will I have to pay to license it as well or whats the deal with that??

    -Bob
    2002 Buick Rendezvous CXL AWD
    LX9 Swapped

  2. #2
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    Anyone??
    2002 Buick Rendezvous CXL AWD
    LX9 Swapped

  3. #3
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    IIRC, the L36 PCM is the same as the L67, but you will definatly want to run a supercharged (L67) bin.

    Since this is an engine swap in a pre OBDII car, I would verify PCM wiring by looking at a 99 L36 Monte Carlo and a 99 GTP to make sure the wiring is the same, then I'd try to flash the PCM with a 99 GTP bin and not worry about buying anything from ZZP.

    If you purchase the hpt file form ZZP, I'm pretty darn sure you're still gonna need to license the vehicle.
    -Eddie

    1998 GTP - 3.4 [3.2] [3.0] MPS - custom CAI - F.1 Ram Air hood - XP Cam - Ported Heads - 1.84/1.60 Si valves - 1.6 HS Roller Rockers - 72mm Ported TB - LQ4 MAF - 42.5# Lucas Injectors - Pacesetters
    1/4 PB - 13.025 @ 106.81 MPH w/ 2.069 60'
    2021 Chevrolet Colorado 2.8 Baby Duramax

  4. #4
    Tuner CTX-SLPR's Avatar
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    Best I know there are a few wires that don't exist on the L36 harness like for the BBV solenoid and the L67 uses a 2bar vs a 1bar MAP but they physically interchange. Isn't the trans different (beyond the diff and chain) between an L36 and an L67?
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  5. #5
    Advanced Tuner
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    Isn't the trans different (beyond the diff and chain) between an L36 and an L67?
    The L67 as a HD output shaft and diff, along with different chain gears (the chain is the same). Other then that, the transmissions are the same.
    -Eddie

    1998 GTP - 3.4 [3.2] [3.0] MPS - custom CAI - F.1 Ram Air hood - XP Cam - Ported Heads - 1.84/1.60 Si valves - 1.6 HS Roller Rockers - 72mm Ported TB - LQ4 MAF - 42.5# Lucas Injectors - Pacesetters
    1/4 PB - 13.025 @ 106.81 MPH w/ 2.069 60'
    2021 Chevrolet Colorado 2.8 Baby Duramax

  6. #6
    Advanced Tuner umrjmac's Avatar
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    Quote Originally Posted by Eddie-98GTP View Post
    The L67 as a HD output shaft and diff, along with different chain gears (the chain is the same). Other then that, the transmissions are the same.
    Correct. The halfshaft on the dif-side of the transmission is different. I think that the other one is the same as the L36. I had to replace the tranny in my L36 Regal and I used a GTP tranny and wound up replacing just one of the halfshafts.
    Kenne Bell Supercharged 2003 Corvette Z06

  7. #7
    Tuner in Training
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    Well I already have the SC bypass solenoid wired in (pin 77, clear connector) and the MAP wires extended witth tthe proper pigtail.

    There are a lot of wiring differences between the 99 Monte Carlo L36 and other 99 L67s

    Im using a 03 Century 4t65e and doing a HD diff conversion to it. I have all the parts, just havent put them in yet.

    Hmmm, im gonna double check wiring. I dont wanna mess with it much more. if its damn close, ill repin a few things and use a GTP PCMs. However I still wanna see if I can tune the MC PCM and have the bypass solenoid working. ZZP obviously does something that make it works
    2002 Buick Rendezvous CXL AWD
    LX9 Swapped