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Thread: 2.5 z3 to 2.8

  1. #1
    Join Date
    Sep 2017
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    Fayetteville nc
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    Z3

    2.5 z3 to 2.8

    I have a 2000 z3 with a 2.5 and yesterday the engine blew.. only 135k but I've found a 2.8 for 500.. my question will it plug and play like the 2.5? Winter time I will be putting my ls1 in. Also I got an m5 rear end with the car will it fit for my ls swap? Otherwise I'm going to use a ctsv rear

  2. #2
    Join Date
    Aug 2016
    Location
    Spring TX, USA
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    266
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    2000 BMW Z3 2.3
    M5 and CTSV rear will not fit without seriously major modification. We would be talking custom rear subframe modifications, new custom driveshaft, custom halfshafts etc..

    I have the same car that you do.

    The stock 3.15 (if you have a manual, auto is 3.46 i believe) 188mm Torsen LSD is sufficient to handle the rated power of an ls1. I rebuilt a 53k mile diff I bought to replace my worn out squealing one.

    That said, if you are wanting to part with your m5 diff, I may be interested for projects later down the road.

  3. #3
    Join Date
    Jul 2004
    Location
    Houston, TX
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    12,462
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    36 Cylinders
    You should flash the ecu to 2.8 for correct operation. Otherwise plug and play.
    -Abel

    - E36 328is ~210-220whp: Lots of Mods.
    - 2000 Z3: Many Mods.
    - 2003 VW Jetta TDI Manual 47-50mpg
    - 1999 S52 Estoril M Coupe
    - 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
    - 2019 M2 Competition, self-tuned, 504whp
    - 2016 Mini Cooper S

  4. #4
    Join Date
    Sep 2017
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    Fayetteville nc
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    I'm in North Carolina if your interested pm me your number and I'll send you pics




    Quote Originally Posted by TommyMaddox View Post
    M5 and CTSV rear will not fit without seriously major modification. We would be talking custom rear subframe modifications, new custom driveshaft, custom halfshafts etc..

    I have the same car that you do.

    The stock 3.15 (if you have a manual, auto is 3.46 i believe) 188mm Torsen LSD is sufficient to handle the rated power of an ls1. I rebuilt a 53k mile diff I bought to replace my worn out squealing one.

    That said, if you are wanting to part with your m5 diff, I may be interested for projects later down the road.

  5. #5
    Join Date
    Sep 2017
    Location
    Fayetteville nc
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    Z3
    Also found a 3.0 will it fall right in? And mate to the 5speed? Or is it a lot of work?

  6. #6
    Join Date
    Jul 2010
    Location
    San Francisco
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    397
    My Cars
    03 530i/5, e30 s52(Sold)
    Quote Originally Posted by Fayettevillin View Post
    Also found a 3.0 will it fall right in? And mate to the 5speed? Or is it a lot of work?
    Wiring, and ecu will definitely be harder since the 3.0(m54) is a completely different motor then the 2.8(m52). To save time and money I would just go with the 2.8 especially since it's only temporary until you put the ls1 in.

  7. #7
    Join Date
    Jan 2015
    Location
    Timaru, New Zealand
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    1,132
    My Cars
    Two Z3 Roadsters
    Check your VIN Decode to see which 2.5 L engine you have, so you know your starting point. You are at the cut over point between the M52TUB25 and the M54B25. Both these engines are duel VANOS. This means that you need a Duel VANOS engine to swap in.

    Options are:
    - M52TUB25, straight swap
    - M54B25, straight swap
    - M52TUB28, flash DME for this engine
    - M54B30, flash DME for this engine

    Note: a M52B28 single VANOS engine will not work for you.
    1999 2.8L Z3 Roadster,
    2000 3.0L Z3 Roadster,

    There is only one thing more pleasurable than working on a Z3, that's driving it top down on a fine day.

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