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  1. #1
    monaroman76's Avatar
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    15/22r @ 8400 rpms

    I have just got back in from testing my ski. I finally managed to get some calm(ish) water and wanted some opinions on my rpms.

    The ski was hauling ass and didnt miss a beat all day which I was happy about. I can finally enjoy riding for a while and put the tools down
    I set my fuel pressure to about 48psi (key pressure, with boost reference attached), and AFRs were - idle - 11.3, mid 12.7, WOT ~ 11.5ish, so I think thats about as close as Im going to get. I was turning 8400 rpm with an untouched 15/22r and stock nozzle.

    From experience - Anyone care to guess what speed I was doing? I was expecting to see my rpms a little higher, should this have been the case?


  2. #2
    A smart admits!A wicked excuses!An idiot insists! mitsakosgt's Avatar
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    I did 71mph on a GTX with a untouched 15/22 at 8000rpm!
    I say you are on high 70s!

  3. #3
    Jerry, Jerry, Jerry jerryspringer's Avatar
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    hey mate,

    i agree, high 70's for sure depending on conditions ofcourse, but..
    u got an iphone, there's a freebie app that gives you speed reading, records your highest speed, in mph,kph or knots - real easy to use.

    compared the results to my garmon on the water and was pretty accurate

    i got a cheapie waterproof cover and had no probs in 2 years

  4. #4
    monaroman76's Avatar
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    I was thinking It would be around there. I was really hoping to join the 80 club, but that doesn't look likely without a bit of tweaking. And at the moment, I just want to ride the thing!!

    I was going to try the iPhone app, but I had no coverage where I was :/ I'll get another gps before too long and find out for sure. I've seen a few people getting 75 with an untouched 15/22 and stock ecu, so hopefully I'm not too far from 80.

  5. #5
    hero's Avatar
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    im finishing off a mate rxpx with a xx charger ecu reflashed 8800 for 60lb inj and running a 15/21 with few other mods, let see what it runs this weekend interested in seeing what yours will do. what rpm is your rev set at

  6. #6
    monaroman76's Avatar
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    Quote Originally Posted by hero View Post
    im finishing off a mate rxpx with a xx charger ecu reflashed 8800 for 60lb inj and running a 15/21 with few other mods, let see what it runs this weekend interested in seeing what yours will do. what rpm is your rev set at
    Yer man, it will be interesting to see what he can get out of his. Let me know how it goes for sure.
    I have the riva ecu. 8650 rpm limit. Where is max power made on this ecu?

  7. #7
    Eric Ocman's Avatar
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    On my x i managed 82.3 with a riva ecu at 8600. Lean it up a tad and shoot for 8550.

  8. #8
    hero's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Yer man, it will be interesting to see what he can get out of his. Let me know how it goes for sure.
    I have the riva ecu. 8650 rpm limit. Where is max power made on this ecu?
    i normally aim for 100rpm less from the rev limiter....but sometimes it does spike and hit the limiter. did u monitor your boost?

  9. #9
    monaroman76's Avatar
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    Quote Originally Posted by Ocman View Post
    On my x i managed 82.3 with a riva ecu at 8600. Lean it up a tad and shoot for 8550.
    Eric, was this with an untouched 15/22 and 87mm nozzle? What charger were you using to turn those rpm? Does my rpm sound low?

    Quote Originally Posted by hero View Post
    i normally aim for 100rpm less from the rev limiter....but sometimes it does spike and hit the limiter. did u monitor your boost?
    Gotcha. I have a cheap mech. boost gauge and was seeing ~12.5 at 8400. I dont think the cheap gauge is very much to go by though.

    How much excess oil can cause a loss of rpm? I did notice after that mine was around the top bend.

  10. #10
    Eric Ocman's Avatar
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    Quote Originally Posted by monaroman76 View Post
    Eric, was this with an untouched 15/22 and 87mm nozzle? What charger were you using to turn those rpm? Does my rpm sound low?



    Gotcha. I have a cheap mech. boost gauge and was seeing ~12.5 at 8400. I dont think the cheap gauge is very much to go by though.

    How much excess oil can cause a loss of rpm? I did notice after that mine was around the top bend.
    No, Duke pitched it and that was with an 83 nozzle. Also was sitting on seat speed. Superman is good for Close to 1.5. Shoot for 8550 bro.

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