CTS 2.8 to 3.6 swap (it's happening)
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, CTS 2.8 to 3.6 swap (it's happening) in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Hey everyone! Have a 2007 CTS 2.8 with an engine about to go. Planning to do a swap to a ...
  1. #1
    slightlycoolwhip is offline Cadillac Owners Member
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    CTS 2.8 to 3.6 swap (it's happening)

    Hey everyone!

    Have a 2007 CTS 2.8 with an engine about to go. Planning to do a swap to a 3.6 - does anyone have experience with this?

    Should it just be a straight reflash of the ECM? Any trouble with security/vehicle acceptance?

    Also, any other mechanical issues to be aware of?

    Thanks for your help!

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  3. #2
    slightlycoolwhip is offline Cadillac Owners Member
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    A few views... but no responses?

    Does anyone have experience on this?

    How about simple2me and bio?

    Thanks!

  4. #3
    ztollon's Avatar
    ztollon is offline Cadillac Owners Fanatic
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    Do you have the ECM from the 3.6 motor? If so it's literally plug and play. If you have all the electrical components.

  5. #4
    Aurora5000's Avatar
    Aurora5000 is offline Cadillac Owners Fanatic
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    Not a good idea...

  6. #5
    curtc's Avatar
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    All that work for 45 HP and 58 lb. ft. of torque?...Seems a bit on the PITA side to me....
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
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    1995 Seville Touring Sedan - 2005-2006

  7. #6
    ztollon's Avatar
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    Is the 2.8 blown or going out? Cause if it is, it's a great idea. And that 45hp makes a hella difference.

    ----------

    It's Like going from the 3.6 to a new tuned 2.0t not really that much more power but it's night and day.

  8. #7
    Kael's Avatar
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    The 3.6 has a lot more torque across a broader band, so if you have a 3.6 laying around then I say go for it. The only difference between the 2.8 and the 3.6 is the cylinder size and related hardware. It should pretty much be plug and play. Heck if you resleeve the cylinders and get the internals from a 3.6 you can turn a 2.8 into a 3.6. Hmm how about getting the LP9 turbo 2.8 out of a saab 9-3, or saab 9-5 (2010 -2012) 280 hp, 270 tq. might be fun to look into. Here is the wiki on the engine. http://en.wikipedia.org/wiki/General...gine#LP9_Turbo

  9. #8
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    I've pondered this question about 2.8 to 3.6. Is the actual tuning different? Or will the ecm sense added airflow and compensate? If not do you need an ecm from a 3.6 or have one programmed? The programming seems to be based on the cars vin. If you program the vin of a different car or use an ecm from a salvage car will the bcm conflict(are the bcms programmed to the vin?)? Like some gm radios have to be programmed to the vin or they say theft lock. Can a aftermarket tuner do this?

    ----------

    I even looked up the engine wiring harness and its the same.http://parts.nalleygmc.com/showAssem...rimLevel=14343 http://parts.nalleygmc.com/showAssem...rimLevel=14343

  10. #9
    ztollon's Avatar
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    You may also get trouble with the rear end. If it's a 03 w a 373 gear and you put a 3.6 ECM in it that runs a 343 gear, you'll have issues.

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    Re: CTS 2.8 to 3.6 swap (it's happening)

    -=chuckles=-Okay okay, this is pretty funny. If you are very worried you can go to dealership after the install and have them reprogram the ecm for a hundred or two. Yes, you can reprogram the gear ration from the rear as well so the speedometer is correct. I am not sure that it would need it for the engine size since the ecm is smart enough to relearn the air flow, power output, knock and timing. Think of it like this: If the car was running at a high altitude with less air it would adjust right? But if you are worried just get a dealership to reprogram it.

  12. #11
    ztollon's Avatar
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    You won't have running issues but your stability control won't work neither will traction control.

  13. #12
    slightlycoolwhip is offline Cadillac Owners Member
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    Hi again!
    Thanks for the responses and interest guys!

    Aurora and Curt, the motor is toast, it's getting pulled. So it's either another 2.8 or the 3.6, why not right?

    Kael, those Saabs sound awesome. But they're FWD or AWD, possible difference with where accessories and such are mounted...

    As for the ECM and related issues, we have a programmer.
    So I'm guessing all the issues everyone is assuming there will be is with the ECM

    Well! We've found a 3.6 out of a 2009 CTS AWD (yes, it's the LY7)
    Does anyone know why the AWD LY7 would be under a different category than the RWD?

    Thanks again!

  14. #13
    slightlycoolwhip is offline Cadillac Owners Member
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    Alright everyone,

    IT'S DONE!!!

    Just to recap:
    2007 2.8 CTS mated with manual trans (engine was blown)
    2009 3.6 CTS AWD mated with automatic trans (engine used to drop in)

    Job done

    Thanks again guys...
    Later

  15. #14
    DopeEffect's Avatar
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    Dude you cant just post something like that and not show us pics let alone video of that beast in action.

  16. #15
    slightlycoolwhip is offline Cadillac Owners Member
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    Re: CTS 2.8 to 3.6 swap (it's happening)

    Quote Originally Posted by DopeEffect View Post
    Dude you cant just post something like that and not show us pics let alone video of that beast in action.
    Lol, I asked for help... and genuinely could've used some tips...
    But the thread went dead even :/

    Anyways, I was gonna post some simple pics, but couldn't on my phone

    As for the video... What kinda video were you looking for?
    I'm avoiding pushing it too hard as I just put in a new clutch

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