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  1. #1

    Engine Tech 137 +4 Slip ???

    Hello everyone My english is not so good therefore I use the google translator.

    I have an RXP X 260 RS. He has already received some modifications from the previous owner.

    Last year I developed a new Motorsport Bosch petrol pump (external) + Riva petrol pressure regulator. Since the pressure of the pump was higher than the old defective (which was synonymous already another pump with more pressure) The injection nozzles have been enlarged by a company. This was also the previous owner. Titanretainer, Racing Thermostat, Solas impeller, air filter incl. Tube changed.

    I have installed an Air-Fuel Ratio display to tune everything in the last year.

    Now in the winter my supercharger maintenance was due and I ordered the Engine Tech 137 +4 from Riva incl. McMaster RIVA Sea-Doo Heavy-duty Supercharger Clutch Spring Washers for 08+.

    Everything assembled and installed according to Riva manual))) (). The slip is however much too high so about 28NM. (247 inch pounds) With the original but new Seadoo Clutch Spring Washers I've been far below 177 inch pounds. What would you recommend me to adjust the Supercharger Slip properly and how high I should adjust it.


  2. #2
    Mod less, ride more! troyheb's Avatar
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    What will be your max RPM? That is something that I would use to help determine were I would set the slip.
    We have my 137x4 set to around 180 inch pounds (15 ft lbs), but I am turning around 9000 RPM.

  3. #3
    ncdoo's Avatar
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    Engine Tech also recommends 15 ft/lbs

  4. #4
    imp0ster's Avatar
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    Set it at 16 and it will settle in around 15. I don't remember washer configs. You can mix and match with OEM washers to bring it down. If you're at 247 you're locked solid and it will not slip.

  5. #5
    Moderator Snoman's Avatar
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    Quote Originally Posted by imp0ster View Post
    Set it at 16 and it will settle in around 15. I don't remember washer configs. You can mix and match with OEM washers to bring it down. If you're at 247 you're locked solid and it will not slip.
    WHat he said......

  6. #6
    Hello thanks for the info ever!The ecu is at 8650 rpm!
    I would then set to 15ft lbs!

    And what would you set for an air / fuel ration at full load?

  7. #7
    Sanfish's Avatar
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    Quote Originally Posted by Mathias85 View Post
    And what would you set for an air / fuel ration at full load?
    Depends what ignition timing really. But if it doesn't knock, I say for that low RPM and with Bosch ecu...12.3 to 12.4 WOT AFR. Or 12.2 is you are scared

  8. #8
    No why should I be afraid?Ignition I can not say anything because the software was already on it!
    I will first so with 12.3 or 4 afr adjust and look as it runs

  9. #9
    Sanfish's Avatar
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    Quote Originally Posted by Mathias85 View Post
    No why should I be afraid?Ignition I can not say anything because the software was already on it!
    Afraid in this case means if you rather be safe with the AFR.

    Still, tuning a motor only with the AFR is something I would never suggest. Without knowing your ignition timing or ability to measure "knock"...you are playing with fire. Especially since the original tune didn't have the 137+4 you just added.

    Good luck.

  10. #10
    So I have now set 20 NM Slip what I think is ok.

    Unfortunately, it only got so: As shown in Fig. The first))) Seadoo are original NEW and the () are Riva HD + 0.1mm shim. Can I do this mixed with HD?

    What are the possibilities to check the ignition if I do not know?

    The software is from the previous owner.

    Do you have another idea or solution that is better?

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