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Thread: 7m CT26 vs Group A CT26, a visual comparison

  1. #1
    Offical SM Expert: Turbochargers
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    Default 7m CT26 vs Group A CT26, a visual comparison

    Ive been wanting to do this for a while, so here we go.

    To catch you up:

    http://www.supramania.com/forums/sho...S-Turbo-A-CT26

    A history lesson on racing Mk3 supras:

    http://www.dtdirl.com/forums/showthread.php?t=4951

    Now for the fun stuff!

    The stock CT26 measurements are as follows (inducer/exducer):

    Compressor 1.70"/2.550", 5 blades
    Turbine 2.650"/2.045", 10 blades

    The Group A CT26 are as follows (inducer/exducer):

    Compressor 2.075"/2.895", 5 blades
    Turbine 2.785"/2.275", 9 blades

    And now for some pictures:

    Comp wheels. Group A on left.



    Comp wheel height. Group A on left.



    Turbine wheels. Group A on right.



    Turbine wheel height. Group A on left.



    Turbine housings. Group A on left. Notice the size difference.



    Turbine housings. Group A on left. Notice the part number difference.



    Compressor housing of the Group A. Serial number possibly?



    Group A from front:



    Group A from side:



    Group A from rear:



    Hope this helps ladies and gents!
    "Performance is nothing without elegance and elegance is nothing without precision."


    Im here, but the business is gone.

    HOLSET Supra Mafia

  2. #2
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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    Firstly, thanks for uploading pics of this.

    However I am rather curious in the difference between the Group A CT26 and Turbo A CT26, that is if they are not the same ?

    I own a Turbo A and by the looks of it, the turbo's are exactly the same, except the exhaust housing is rusty on mine, and have the same part number 42020. The only difference I recognise is that yours is missing the stamped "E" on the intake side.

    Is there anyone out there that can confirm differences between Group A and Turbo A ?

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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    I have a Turbo A supra, but when I bought it off the previous owner he had unknowingly swapped the turbo for standard ct26 as it was smoking, sigh, there is no helping some people.

    Anyway has anyone even heard of a Turbo A ct26 for sale as I would like to restore my car back to its Turbo A glory.

  4. #4
    Grumpy Old Man
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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    My understanding is the TurboA road cars ran the garden variety CT26, nothing "special" about it at all, the GroupA Race cars were a very different beast as in Jon's pics above.

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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    It is a different part number in the Toyota parts catalog, and there are a few visual comparisons from people who have pulled them off the Turbo A road cars, Turbo A cars also dyno bigger numbers than a standard CT26 could put out.

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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    Quote Originally Posted by limbodk View Post
    It is a different part number in the Toyota parts catalog, and there are a few visual comparisons from people who have pulled them off the Turbo A road cars, Turbo A cars also dyno bigger numbers than a standard CT26 could put out.
    As always I'm happy to be proven wrong as I don't like to spread incorrect information.
    (turns out only the inducer size changed, turbine is the same so only 25>35 extra HP)

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    Default Re: 7m CT26 vs Group A CT26, a visual comparison

    This might help someone else down the road.
    I was curious about the trim difference between the two turbos.

    ct26 supra "stock"

    compressor
    43.18mm inducer
    64.77mm exducer

    trim 44.4444

    turbine
    67.31mm inducer
    51.943mm exducer

    trim 59.5517

    ct26 "group A"

    compressor
    52.705mm inducer
    73.533mm exducer

    trim 51.3734

    turbine
    70.73mm inducer
    57.785mm exducer

    trim 66.7456

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