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Thread: Blacktop ITBS vs Silvertop ITBS

  1. #1
    Senior Member Futo_gt86's Avatar
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    Default Blacktop ITBS vs Silvertop ITBS

    Car - Toyota AE71 Pano

    motor / part in question - ITBS

    problem - Actual Sizing

    occurs/started when (if applicable)- Bought ITBS

    personal situation (if applicable)- N/A

    What size are AE111 ITBS
    And what size are AE101

    Been searching for the answer and come up with different answers.
    I bought some ITBS, spose to be BT, but measure 47mm at the opening where stack bolts on


    Says AE111 47mm, AE101 45mm


    Says AE111 45mm, AE101 42mm....
    then states
    Silvertop ITB's measure 47mm at the opening where the velocity stacks bolt up.
    Blacktop ITB's measure 49mm at the opening where the velocity stacks bolt up.
    On the backside of the silvertop ITB's they are round.
    On the backside of the blacktop ITB's they are an odd diamond shape.


    Says AE101 45mm

    Can someone who knows please help a wigga out.

  2. #2
    Senior Member Futo_gt86's Avatar
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    Default Measurements taken

    Upper measures 47mm
    Click image for larger version. 

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    Lower measures 42.5, and is perfectly round
    Click image for larger version. 

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    I think they are Silvertop....Don't Blacktop have a strange shape at the lower end?
    Last edited by Futo_gt86; 26th February 2016 at 04:42 PM.

  3. #3
    Veteran LittleRedSpirit's Avatar
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    Default

    Theres a great photo online comparing them all.

    There are more distinctions than bt or st. Theres st early, st late and bt afaik. So within silvertop there are 2 slightly different variants from memory.

    Theres a photo someplace online that compares the ports of all three.






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    Veteran LittleRedSpirit's Avatar
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    Default

    Theres a great photo online comparing them all.

    There are more distinctions than bt or st. Theres st early, st late and bt afaik. So within silvertop there are 2 slightly different variants from memory.

    Theres a photo someplace online that compares the ports of all three.






  5. #5
    Senior Member Futo_gt86's Avatar
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    Default

    Thanks for the info Matt.
    I never even knew there were Silvertop early and late!
    I was of the opinion that Silvertop ITBS were 48mm at opening where stack bolts on, and Blacktop were 50mm.
    This was because TODA sold velocity stacks as 48's and 50's.
    I would like to see the TB's pulled off the Manifold and measured up on all variants and referenced for all to see.
    Last edited by Futo_gt86; 27th February 2016 at 11:25 AM.

  6. #6
    Moderator Sam-Q's Avatar
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    Default

    Those you have pictured are silvertop, likely gen 2.

    The easiest way to tell from the front is the mounting bolts for the velocity stacks are 73mm center to center, but on the black they are 83mm.

    As for the back the silvertop are round and the blacktop aren't.
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  7. #7
    Senior Member Futo_gt86's Avatar
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    Thanks for the info Sam.
    Click image for larger version. 

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    Silvertop it is.

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