Page 3 of 8 FirstFirst 12345 ... LastLast
Results 21 to 30 of 72
  1. #21
    isnt the stx-12f and 15f a MH7203 based setup?


  2. #22
    Quote Originally Posted by raven007 View Post
    isnt the stx-12f and 15f a MH7203 based setup?
    I have no idea.

    So far I have also read out and modified an ECU of a SX-R.
    And that was almost 1:1 identical to the Ultra LX.

    Looking through Dimsport's docs, there are multiple different ECU's with different shapes, and I am sure somewhat different processors in them.
    But I doubt the ECU logic is much different.

    The Kawasaki motorbikes also use ECU's that are very very similar.

  3. #23
    Quote Originally Posted by smokeysevin View Post
    All kawasaki 4 stroke skis since the 12f was introduced use a map sensor and tps sensor. I would be interested to compare the 15f map to the ultra lx map. Its the same engine with some minor differences for gauges and security.

    Sean
    If you send me an ECU I can dump it
    I don't have access to one.

  4. #24
    LindenPWC's Avatar
    Join Date
    Sep 2013
    Location
    New Jersey
    Posts
    129
    +1
    8
    Quote Originally Posted by prj View Post
    If you send me an ECU I can dump it
    I don't have access to one.
    would you want to dump a 310 ECU? i can send you an 2015 310 ECU.

  5. #25
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,673
    +1
    340
    Quote Originally Posted by prj View Post
    If you send me an ECU I can dump it
    I don't have access to one.
    Already have dumps, I need to figure out the offset and factors so I can do more than move them. I have a small collection going lol

    Sean

  6. #26
    Well, upload the files then, it's not like stock files are some big secret.
    I'll define it if you want, it's not much work.

    For some more content, here are the fuel and ignition map lookup subroutines in IDA PRO.
    There are a lot of different maps and seeing when what is used means writing a ram logger/ram logging protocol.
    There are about 6 sets of per-cylinder TPS/IAP maps for fuel and a bunch of TPS map for ignition.

    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	ultralx_ign.png 
Views:	179 
Size:	153.6 KB 
ID:	449521   Click image for larger version. 

Name:	ultralx_fuel.png 
Views:	175 
Size:	146.9 KB 
ID:	449522  

  7. #27
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,673
    +1
    340
    Had to upload to google drive: https://drive.google.com/drive/folde..._-?usp=sharing

    2004 12f
    2004 15f
    2005 15f
    2003 12f

    The 12f uses one temp sensor while the 15f uses 2, the ultra lx uses a different temperature sensor range and has different gauge programming and security than the early model stx skis.



    Sean
    Last edited by smokeysevin; 06-12-2019 at 09:41 PM.

  8. #28
    I had a quick look, haven't had time to dive in too much.

    Looked at the file marked as "my ski" - STX12F ECU is much much simpler. I guess the STX15F too. Different uC, as ROM is 128k.

    There's just 4 MAP fuel maps - all tuned the same.
    4 TPS fuel maps - with slight differences.
    2 TPS ignition maps, both tuned the same.

    Same thing as the Ultra LX. Ignition starting to drop after 6k and big drop from 7k to 7.5k then 8k.
    Also fuel maps are calibrated until 8000, after that flatline.

    How much RPM do you run? Could probably benefit from added timing just like my Ultra...

  9. #29
    Are any of those dumps from the ecus which were known to hole pistons? It would be interesting to compare a dump from one of those vs the "good" ones.

    Beyond 8k the 12f and 15f engines in stock form kind of self disassemble sometimes....

  10. #30
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
    Join Date
    May 2008
    Location
    Houston
    Posts
    4,673
    +1
    340
    Quote Originally Posted by prj View Post
    I had a quick look, haven't had time to dive in too much.

    Looked at the file marked as "my ski" - STX12F ECU is much much simpler. I guess the STX15F too. Different uC, as ROM is 128k.

    There's just 4 MAP fuel maps - all tuned the same.
    4 TPS fuel maps - with slight differences.
    2 TPS ignition maps, both tuned the same.

    Same thing as the Ultra LX. Ignition starting to drop after 6k and big drop from 7k to 7.5k then 8k.
    Also fuel maps are calibrated until 8000, after that flatline.

    How much RPM do you run? Could probably benefit from added timing just like my Ultra...
    Yeah, the 03 and 04 12f ecus run 1 "water temp" sensor and do not have slo mode, the 04 15f ecu doesnt run slo mode but run 1"water temp" and 1 oil temp sensor.

    These engines just arent setup to spin super fast.

    The valvetrain is straight out of a zx12r and can spin to 13k but on the 12f the rods aren't the best, the intake runners are stupid long, and the cams are laughably small.

    The 15f is the same head and valvetrain but the stroke is almost 70mm vs the 55.4 on the zx ans 12f so you have way higher piston speed and acceleration. I ran my ms3 controlled 15f to 9k an it was ok but that wasnt for long and it was with better springs, valves, and lighter rotating assembly.

    Stock the 15f has bigger cams but they are still pretty small and runs a medium lenght runner.

    Imho the motors are setup pretty well to run at 7500 where the pump efficiency is high, spinning the motor just doesnt help since you overspin the pump.

    Once the pump is flowing much more water, you start to starve it with the pump tunnel.

    Sean

  11. +1 by:


Page 3 of 8 FirstFirst 12345 ... LastLast

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. 2011-12 ultra 300 ECU work correctly on a 2013 ultra 300?
    By jetdave56 in forum Kawasaki PWC Performance (4-stroke)
    Replies: 13
    Last Post: 06-19-2014, 03:37 AM
  2. Ultra 300x ecu?
    By jeff007 in forum Kawasaki PWC Performance (4-stroke)
    Replies: 9
    Last Post: 07-05-2013, 07:16 PM
  3. Ultra 250x ecu
    By danieletrono in forum Kawasaki PWC Performance (4-stroke)
    Replies: 2
    Last Post: 08-28-2009, 01:48 AM
  4. Replies: 8
    Last Post: 12-04-2007, 07:55 AM
  5. hacking tivo
    By Lurker in forum Sea Doo Open Discussion
    Replies: 2
    Last Post: 03-13-2006, 12:17 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •