Approx Boost
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Approx Boost

  1. #1
    415 M3
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    Default Approx Boost

    Where can I get approx boost #'s for weiand 871. Never had a blower motor so it needs to be straight forward. Example... 57 tooth pulley top 59 bottom. I would like to be able to figure it out by top and bottom pulley sizes. Thanks
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  3. #2
    No Sandbar To Far sanger rat's Avatar
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    You should see 6-7 # at 6000rpms.
    Quote Originally Posted by One More Year View Post
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    wouldn't cubic inches come into play here?
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  6. #4
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    Get on the phone and call Weiand. They will need to know cubic inches, blower pulley sizes (number of teeth), and more about the blower. (Is it teflon stripped or not) Maybe more.

    It seems each blower Mfg. has their own output numbers.

    Then get a gauge to check the blower itself and see if you got good numbers. Their numbers will be ballpark numbers only.
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  8. #6
    TJS
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    According to the pulley ratio formula you are overdriven 3.39%.
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  9. #7
    gn7
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    Rpm means almost nothing. Cubics means everything. Absolutlyn no way to determine boost with out knowing the CID. Cam, exhaust, and carb size play into it also.
    http://www.blowerdriveservice.com/techcharts.php



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  10. #8
    415 M3
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    Guess its more complicated than I thought. I was hoping for a chart that would give you a ball park figure on boost according to what pulley combo you used. Out of the box 871 Weiand blower, 496 bbc. If you had a shit load of pulleys laying around and wanted to mix and match to make adjustments, it would be cool to know approx boost. Im going to have to school myself on blown applications. Thanks fellas.
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  11. #9
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    Quote Originally Posted by gn7 View Post
    Rpm means almost nothing. Cubics means everything. Absolutlyn no way to determine boost with out knowing the CID. Cam, exhaust, and carb size play into it also.
    http://www.blowerdriveservice.com/techcharts.php
    Thanks, thats the kind of info im interested in.
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