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  1. #1

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    A little slower than expected

    i just did a stageII plus lighweight valves,retainers,sprocket,oil jet and a RR ecu, but i am only turning 7950-8000 rpm's and best run 75.8mph normal 74.9mph. i tried removing knock sensor chips and rpm's went down 300rpm's. help will be ery welcomed.


  2. #2
    Site Admin Green Hulk's Avatar
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    Which impeller? Typcially we have to take 2mm out of the trailing edge of a 15/20 to get them to spin up to 8400 RPM's

  3. #3

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    I have a 15/20r. I was reading other threads which you say them same thing, how do i go about that? You mean to increase pitch or decrease pitch?

  4. #4
    HOSS's Avatar
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    First time out today since April. I have a rear intake with no filter. Waterbox chopped and gutted, riva: grate, sponsons, thumb throttle, 58mm tb, RE block offs, reverse bucket cut, filled in and smoothed rideplate transitions, and a 2.0 wedge. Hitting 7850-79 with the stock 15/20. Sending that to Jerry with my charger and RR impeller.

    This is a new machine since my last outing as I`ve added all this since last ride. It was scary in 2-3 foot. Stayed straight as an arrow but It would get major air. Not use to it. Every time I came out the water I let off then back on when I hit with trimm all the way up. Its gonna take getting use to before I hammer for a long spell.

    With no thermostat it seems I need to bring water as The only way I could get rid of the air was after riding for 20mins then hammerring it the buzzer went of. Cracked cap and a whole lotta air came out the puke tank. Filled with some sea water and was fine. Flushing as we speak.

  5. #5
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Chezzy
    I have a 15/20r. I was reading other threads which you say them same thing, how do i go about that? You mean to increase pitch or decrease pitch?
    http://greenhulk.net/forums/showthread.php?t=2614

  6. #6

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    Mar 2006
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    it had 6.11mm from tip of trailing edge to table, now 7.31m and i lost 400 rpm's. can't i just use a 14/19r or something. and who can fix this impeller for me? PPG maybe?

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