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  1. #1

    Stock Ignition Maps Ultra 250 and 260

    Anybody have any screen shots of the stock ignition maps for the ultra 250 or 260 or the ability to download them from the ecu? I saw the motec start up file and it really doesnt help me much. I'm looking for a starting point for my aftermarket ECU on my turbo 260 project. Thank you for any help.


  2. #2

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    Can you not read the motec base map? Id say that if you can thats a pretty darn decent starting point

  3. #3
    Thanks for the response. I did see the motec map, but wasn't sure how close to the stock ecu it was. I would still love to see what the stock ECU is doing.

  4. #4

    For those who maybe interested, this is supposed to be the stock 310 ignition timing map. I would imagine it would be close to the 260 map. It is thottle position vs rpm. Its accuracy is unknown. I got it from a well known and reputable jet ski tuner.

    Here is a start file from a well known aftermarket ECU manufacture. I hope they don't mind me sharing it as it can be downloaded an viewed by anyone for free.



    There is a big difference in total timing. I wonder if its safe?

    Have any of you run the Motec map out of the box and found it to be acceptable?
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  5. #5

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    If im reading that rights its between 5-14* timing idle and around 25-26* WOT?

    I cant see the boost scale.....

  6. #6
    MWHC, there isn't a boost scale on the stock map. Purely TPS vs RPM. Yes I agree with your interpretation. If we assume that wide open throttle on the 310 nets you 17 psi we can start to populate a more conventional MAP vs RPM timing map like the other one.

    Here is a picture of what I have been working on for mine based on this info. It is untested under boost so far. Seems to idle and rev on the stand well. The timing under higher boost has been lowered compared to the stock map intentionally so I don't blow it up trying to find the happy place.

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  7. #7

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    Damn you guys and your metric units but i agree with what you got there. I know seadoos will eat up 26+ * timing on pump gas and i ran my yamaha at that or more with stock boost on California 91octane but unless you got a knock sensor and the frequency DIALED in dead nuts id go very conservatively. Nothing wrong with a good ol fashion plug chop to at least get an idea.

  8. #8

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    Also that being said, depending where you are and the weather, I've ran the lauri eho double pulley smallest setup to 9k and never ever saw more then 17psi, everything just ramped up quicker

  9. #9
    What would you say the stock 310 averages for boost at WOT at sea level 80 degrees?

  10. #10

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    80* once heat soaked probably 14-15, put a manual gauge on it and see for yourself.

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