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  1. #1
    Mtuned's Avatar
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    All that.. And only that! =(

    So, recently added some new things to the ski,

    ET68-140LE
    Les Cooke ECU 9k limit
    15/20 impeller
    75LB injectors
    Ferrea Spring kit

    Ski is tuned to high 11 afrs.

    Trimmed out today all i could get is 82.4 @ 8500 RPMS.

    Thats 2.4 mph faster then i got with a S3 charger at 8160 RPMS.

    Checked plugs.

    Tons of more low end pull.. But what the hell, got to have more then 2.4 mph in it.

    My goal is 90, im far off! Duke will be pitching me to get as close to 9k as possible this weekend, but i know its not going to unleash 7.6 mph!


    What gives?


  2. #2
    Sturm215's Avatar
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    It's not a cake walk homie,

  3. #3
    Moderator beerdart's Avatar
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    Welcome to the world of fluid dynamics. 90 is a lofty goal.

  4. #4
    Mtuned's Avatar
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    2.4 mph difference from s3... and going from 8160 to 8500. My dam s3 would gotten me another 1.5 im sure

  5. #5
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    Gaining big speeds over 80 mph isn't an easy task! It takes alot more than just bolt-on's. If all your interested in is number chasing... why didn't you buy the biggest charger available, or go turbo

  6. #6
    Quote Originally Posted by Mtuned View Post
    2.4 mph difference from s3... and going from 8160 to 8500. My dam s3 would gotten me another 1.5 im sure
    That charger was installed on a Riva ECU ski at 8540-60 rpm it was running over 86mph.

  7. #7
    Gone in 3.0 seconds... RXPT400's Avatar
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    Quote Originally Posted by Mtuned View Post
    So, recently added some new things to the ski,

    ET68-140LE
    Les Cooke ECU 9k limit
    15/20 impeller
    75LB injectors
    Ferrea Spring kit

    Ski is tuned to high 11 afrs.

    Trimmed out today all i could get is 82.4 @ 8500 RPMS.

    Thats 2.4 mph faster then i got with a S3 charger at 8160 RPMS.

    Checked plugs.

    Tons of more low end pull.. But what the hell, got to have more then 2.4 mph in it.

    My goal is 90, im far off! Duke will be pitching me to get as close to 9k as possible this weekend, but i know its not going to unleash 7.6 mph!


    What gives?
    sounds like your charger clutch is slipping at high RPMs or you can have a boost leak somewhere. Are you running a BOV??. Do you have a boost gauge install and if so what does it read at 8500 rpm??..also check for cylinder leakage test you might have blowby at high rpm thus reducing your top speed. another issue can be exhaust restriction. do you have a racing waterbox on the craft??... just my 2 cents....

  8. #8
    Having Fun jp1300r's Avatar
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    What I/C are you running? Stock rideplate? After 80-81 its about 1K per mph.

    Its a little weird you are not pulling that 15/20 prop up to about 8700-8800 with that SCer. I don't know your complete set up and what parts you have, tho.

  9. #9
    Mothman's Avatar
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    If its pulling that hard down low and not as up top, check your timing. May need to scoot it over on the retarded side to help it pull up top. Worth a check! Good luck!

  10. #10
    JFizzleJR's Avatar
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    Quote Originally Posted by Mothman View Post
    If its pulling that hard down low and not as up top, check your timing. May need to scoot it over on the retarded side to help it pull up top. Worth a check! Good luck!
    +100000000

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