Changing to 8mm, belt and pulley combos that are working well??

Discussion in 'PSI Superchargers Tech Questions' started by Scotttrod, Aug 9, 2015.

  1. Scotttrod

    Scotttrod Member

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    I did a bunch of searching previous threads and just could not come up with the right search words...........

    I am building a new motor combo and need a little advice on 8mmm belt/pulley combos.

    The 11mm 1595 belt was great on my .100 tall deck TFX with fuel heads and shorter intake. Now, with the BAE .100 tall deck and the taller BAE intake, I can barely get any sort of overdrive with the 11mm belt and even a custom 24 tooth 11mm top pulley.

    My choices are any brand 1600 8mm belt or the star 1670 8mm belt, both 84 wide. What pulley combos are good for 128 over? With the 1670, I can use a larger top pulley, not familiar with the pro/cons of the longer Star belt.

    What belt lives the best with a two step?

    TIA,
    Scott
     
    #1
    Scotttrod, Aug 9, 2015
  2. overkill69

    overkill69 Member

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    Belt

    1705 -11mm will work fine on the tall deck. You will need a custom bottom pulley. Reehl sells them for around 275.00.
    It's not simple but will outlive 8mm.
     
    #2
    overkill69, Aug 9, 2015
  3. Mike Canter

    Mike Canter Top Dragster
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    Scott, I have only seen 1400, 1600 and 1792 in a 8 mm GT belt. If you give me the distance between the centers of the upper and lower pulley and the number of teeth on each pulley I can tell you if the 1600 belt will work.
     
    #3
    Mike Canter, Aug 9, 2015
  4. Scotttrod

    Scotttrod Member

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    New belt available

    Mike, oops, it was a 1672, RBS has them. I am at 23.4 ish inches center to center

    http://www.rbssuperchargers.com/Products/Star_Racer_8MM__Blower_Belt--1600-0002A look at the "options" there is a 1672.

    Scott
     
    #4
    Scotttrod, Aug 9, 2015
  5. Scotttrod

    Scotttrod Member

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    I have the 11 pulleys for good ODs

    I was not aware of the 1705 11mm, that might be a good option. I have all the pulleys needed if I use the longer belt. Thanks!!!


    Scott
     
    #5
    Scotttrod, Aug 9, 2015
  6. Mike Canter

    Mike Canter Top Dragster
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    According to my chart with a 23.4 and a total of 107 teeth then a 1600 8 mm GT is what you need. You get a horsepower gain of approx 20 with a 8 mm belt over a 11 mm belt. Don't ask me how , lol, that's what all the guys who have tested it on the dyno say
     
    #6
    Mike Canter, Aug 9, 2015
  7. Bjs344

    Bjs344 Member

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    Gotta love ITA. I was cruising the classifieds right after reading this.... You might want to take a gander.
     
    #7
    Bjs344, Aug 9, 2015
  8. overkill69

    overkill69 Member

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    11mm

    The belt ends up too long so you have a huge top and bottom pulley. The crank triggers and everything on the bottom are a pain also because of the huge diameter. I ran the 11 on my Chevy with and rotor and 125%. 30 hits on the 2 step with a used belt of a px car. My bae has not been as successful but I think I cured it with a better idler setup with a central location.
     
    #8
    overkill69, Aug 9, 2015
  9. Blownalky

    Blownalky Top Sportsman

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    I've run both the 1600-84 8MMGT and 1672-84 8MMGT Star Racer belts since January. Have not broke one yet and have NO BLACK SNOW like the Gates put off and dirty up your engine. Have been told they are good for at least 25 runs vice the 1-3 runs of the Gates. So far, that has been my experience. Very tight on a C Rotor, they actually squeak while turning over when tightened down. Happy so far.
     
    #9
    Blownalky, Aug 9, 2015
  10. Scotttrod

    Scotttrod Member

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    Thanks Mike, I have heard everything from 10 to 150 using the 8mm vs 11mm.
     
    #10
    Scotttrod, Aug 10, 2015
  11. Soldierboy0098

    Soldierboy0098 Active Member

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    belt length

    Hi Scott, I had the 1595 on mine with 41.7 percent of using a 51 bottom and 36 top I think it was and that was .100 tall BAE fatheads, BAE intake, and 1/2" retro plate but that 1705 belt may be worth a look. RCD has a nice charge for belt length on their site that I used that tells you what you can get away with for crank to blower centerlines and teeth counts.

    Just remembered you run the screw...sorry bud

    Best wishes bud,
    Trevor Sherwood

     
    #11
    Soldierboy0098, Aug 21, 2015
  12. blown1969camaro

    blown1969camaro Member

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    8mm belt

    fact on a tall deck with bae intake and a divert er plate under screw a 1600 8mm belt and 71x33 115%od the belt is a perfect fit if you don't wanna use a tensioner .lol
    so i ordered a 68 and a 32 and should be ok but ill let you know this week . modifications to the top pulley is required
     
    #12
    blown1969camaro, Aug 23, 2015

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