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  1. #1

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    gained 50-100rpm with ross tb mod

    I got to try my modded tb from Ross yesterday with great results.Before the mod I saw a consistent 8450rpm with the 80mm ring and after the tb mod 8500/8550 with almost identical air/water temps.I could not check to see if I gained any more on top end due to low fuel level and porpoising but with the rpms gained I should see something.The ski also feels a little snappier. Good job Ross and quick turnaround as well
    Barry


  2. #2

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    Good info Speedy--could you or Ross give details on what this mod consists of and the costs. Thanks.

  3. #3

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    Ray,there was a post a couple weeks ago where Ross explains what he does to the tb.The cost is $130.

  4. #4
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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  5. #5

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    Ross does great work. Just did a throttle body for me and I'm very pleased with it.

  6. #6
    Always love hearing good results Barry.. Made my day...
    Ray i simply port the throttle body.. There are many sore spots in it and it just needs a little TLC to let the air have a smoother transition.
    I do reshape the housing on the inlet side to make the factorys taper bore even greater.
    It simply acts as an accellerator to the airflow as it makes its way through the taper bore, similar to a velocity stack.
    The balance of air volume, and air speed, is the trick.
    Boring out a T/B will add air volume, but slow air speed, and usually will be a loser in power unless you are building a real bell ringer rpm wise with a big bore.
    A big bore engine running 9000 plus may benefit from a bored out T/B, because it would require, and move more air, and be able to maintain the same air speed/velocity as a standard bore at a slightly lower rpm.
    But,,, the drawback to a bored out T/B is you lose the taper bore, and thats a big thing to lose.
    One thing that makes the Yamaha Sonic Boom T/Bs work is the creation of a taper bore.
    They are dead nuts straight from the factory, they are tapered when i am done with them.
    Laws of physics remain the same, 2 stroke, 4 stroke, NA, super, turbo, doesnt matter.
    Ross

  7. #7
    Dirty Sanchez's Avatar
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    Im sure these babies work, but was Speedy's test same day back to back with in one hour? I bought and sent a TB to Ross last Friday. I'm looking foward to seeing the results.

  8. #8
    Gus13letter's Avatar
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    Quote Originally Posted by bigdaddyRXP View Post
    Ya beat me to it. I was just about to post that link.

  9. #9
    richrxp's Avatar
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    Thats a nice gain in rpm's for the money!

  10. #10
    rxpredviper's Avatar
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    Quote Originally Posted by Gus13letter View Post
    Ya beat me to it. I was just about to post that link.
    hi thi you cut you rouber gaket? because if you no for need to ! that way you get more rpm.

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