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jetape

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  1. jetape

    Hard time starting

    What's weird is that it's gotten worse over time. Can these sensors lose performance but not totally fail? Stock ECU would not start if they're were broken but it does and Link has taken a massive turn for the worse.
  2. jetape

    Hard time starting

    Yeah it makes cranking not as rough but the ECU is just not picking up a steady crank rpm. Looks like it's back to stock ECU flashing for me. Hopefully tech people will look at my ticket and build a trigger preset for these motors into the firmware.
  3. jetape

    Hard time starting

    Interesting, will give that a shot.
  4. jetape

    Hard time starting

    Yeah I looked at that already, there's a 2500 max value
  5. jetape

    Hard time starting

    I emailed tech support and they opened a ticket, not sure what that means exactly. Did some experimenting with the timing at cranking RPM, it lessened the nasty sounds but I think there's build in logic that disengages the start status when RPM crosses it. With the ECU seeing garbage RPM spikes to 4k during cranking it's causing the starter to disengage and engage even though the start is held. Here is a pic how cranking looks, no steady RPM detected by the ecu and all those spikes are causing starter cycle, rough stuff. Still not sure how last season it seemed to start a lot better. Now it doesn't even see a steady cranking RPM, I could blame a bad sensor but the stock ECU starts just fine.
  6. Crank Enrichment (to get it started at various coolant temps) and Warm Up Enrichment (to keep it happy after it starts while it warms up) might be something you want to look at.
  7. jetape

    Hard time starting

    OK I just emailed them giving a short explanation and pointing to the two threads on the issue. Interesting, I'll give that a try, at this point I'd just like to start the motor without grinding the gears, it's nasty. Will most likely pull the motor over winter to inspect things from all these kick backs.
  8. Since I'm not getting any bite in my own thread I'm bumping this one. Any chance of a firmware based "fix" for the Rotax 4tec cranking trigger issues? I'm experiencing the same issue with kickbacks and very poor and inconsistent starts.
  9. jetape

    Hard time starting

    Here are logs of back to back start attempts on a "cold" engine that was sitting for 24h. Exact same settings, the good start happened on first attempt, second attempt was 30 seconds after the first attempt.
  10. jetape

    Hard time starting

    What a tease, I switched to Rising and the first attempt to start was perfect, it fired up instantly with zero trigger errors. I'm like wow no way ...tried another start and it's back to garbage Tried changing trigger voltages to various levels, different filtering, nope nothing. Once in a blue moon it will fire up perfectly as if a lottery wheel turned and it was just lined up that one time. Next attempt will be trash. This is so rough on the starter and the starter gear on the flywheel on these motors.
  11. jetape

    Hard time starting

    I've been doing a bit more research on this and with my current Trig 2 set to Falling the falling edge of Trig 2 might be too close to the tooth of Trig 1. Any issues with changing Trig 2 to Raising to move it further away? Looks like I'm dealing with the same thing as
  12. jetape

    Hard time starting

    Here is another scope when the earth and the moon aligned and it started very quickly. Trigger Scope Log 2019-08-11 12;59;33 pm.llg
  13. jetape

    Hard time starting

    I did some trigger scope readings while cranking. Honestly I have no idea how to interpret the results. Attached is also a regular log while I was doing the scope captures. Trigger Scope Log 2019-08-11 12;12;51 pm.llg Trigger Scope Log 2019-08-11 12;15;10 pm.llg Trigger Scope Log 2019-08-11 12;16;25 pm.llg Trigger Scope Log 2019-08-11 12;17;22 pm.llg dw - Log 2019-08-11 12;17;43 pm.llg
  14. jetape

    Hard time starting

    I'm having a hard time starting my Rotax 4tec motor, I've been trying all kinds of crank enrichment values but can't seem to pin point the issue. This is a jetski so there aren't exactly coldddd starts, 20C / 70F is basically as cold as it gets. If I connect stock ECU it starts up very nicely and very quickly. With link it's a struggle. From logging it seems to takes a bit of time for RPM to register after the start button is pressed. I also see trigger errors. Sometimes there's a weird high spike even though that didn't happen in reality. I tried everything from 0 crank enrichment to 60/70 and everything in between. Doesn't seem like there's a pattern where it seems to be getting better going either direction. Attached is my map and couple logs of start attempts. (lambda is not logged since I had my controller on another battery to see values during cranking) Thanks 30.1.1.pclr dw - Log 2019-08-10 5;51;06 pm.llg dw2 - Log 2019-08-10 5;51;06 pm.llg
  15. Is there a logical way to extrapolate crank enrichment to different temperatures if I have one that seems to be working well?
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