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  1. #1

    Join Date
    Mar 2009
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    Fueling help - Les Cooke ECU 8800 RPM for RXT-X 260

    Hello,

    i'm in a middle of rebuilding my engine as i blew the engine (totally wasted) with a failed connecting rod bolt and i need some advice on fueling especially with les cooke ECU.
    I ride offshore in Tahiti and here is my setup on my 2010 RXT-X 260:

    - stock crankshaft
    - stock pistons
    - Ferrea valves
    - Riva full valvetrain
    - ARP studs
    - Les cooke intake manifold
    - Les cooke ECU 8800 RPM rev limit (2005)
    - Turbosmart FPR
    - Turbotech fuel rail
    - Walbro fuel pump
    - Siemens 60 lb injectors
    - Seadoo Centre Intercooler
    - Custom intercooler bracket
    - 2RUDE SC (slip at 18.5 ft/lb)
    - 15/22R solas 4 blade repitched to SFR 12/17 setback
    - Rotax Racing front engine mount
    - 4" K&N air intake
    - 83 mm ring
    - Riva open loop cooling
    - Seadoo Centre extended rideplate
    - 05 harness + 05 cluster
    - Blackmagic headers
    - Shorty gibson muffler
    - Lemoine sponsons RXT-X 260

    Before the engine broke, i checked AFR (base pressure 60 psi) and at idle i could see AFR at around 16 which is very lean but it seems to be common with the SDC ECU. I could not checked AFR at WOT as the 02 sensor died shortly.
    My point is i read a lot of people have run les cooke ECU but most of them are switching from 60lb to 80lb injectors even though the ECU is mapped for 60lb. I know i definitely have to check AFR but i'd like some input from others and to get some info on what base pressure they are running on their RRFPR. I just got some new BOSCH 48s as well but guess it won't be enough.

    Just don't want to break my engine a 2nd time ...


  2. #2
    i hate my bipolar disorder its great
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    sure it was a rod bolt... sounds very lean for a boosted motor...

  3. #3

    Join Date
    Mar 2009
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    Tahiti
    Posts
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    I couldn't checked AFR at WOT but i would be pretty sure i would have seen way too lean at WOT anyway. That's why i wanna get some advice if i should get 80lb injectors.

  4. #4

    Join Date
    Sep 2010
    Location
    Asia pacific
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    18
    Could you tell me how you removed the ride plate? that thing is a bit-h to remove. A picture of the ride plate would be nice. Thank you.

  5. #5

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    Click image for larger version. 

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  6. #6
    MSRXP's Avatar
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    Quote Originally Posted by RT260RS View Post
    Could you tell me how you removed the ride plate? that thing is a bit-h to remove. A picture of the ride plate would be nice. Thank you.
    Remove the pump.
    Remove the charger.
    Remove the water box.
    Remove the Intake grate.
    Detach coolant hoses from the ride plate fittings from INSIDE the hull.
    Remove with channel locks the nipple fittings that the coolant hoses attached too. THIS IS A MUST. THEY WILL BREAK IF YOU DO NOT DO THIS!
    Remove 6 bolts and place a bottle jack with a folded towel inside the pump tunnel.
    Start at the aft section of the plate and jack it up. It will start to break free. Lower the jack and move forward toward the front of the ski and repeat.
    As you start to jack, take a razor and cut the silicone away from the hull and the plate. It will fall out to the floor. Be careful, getting hit by a jack and 14lb plate kinda hurts.

    You also must clean the hull up and remove excess silicone before you re-install the plate. If you want re-install instructions, let us know!

  7. #7

    Join Date
    Mar 2009
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    Tahiti
    Posts
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    let's not get off topic please...

  8. #8
    JPR's Avatar
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    Quote Originally Posted by cracker View Post
    sure it was a rod bolt... sounds very lean for a boosted motor...
    how the hell would you know it was lean ??????? did you map the ecu ?
    Les`s ecu`s are not "one suits all'

  9. #9

    Join Date
    Mar 2009
    Location
    Tahiti
    Posts
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    the previous owner was a closed course racer in Cayman so that's why he went with les cooke parts for his ski.
    The ecu was mapped for 60lb injectors.

  10. #10
    i hate my bipolar disorder its great
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    Nov 2011
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    Melbourne - Australia
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    Quote Originally Posted by jaffabas View Post
    how the hell would you know it was lean ??????? did you map the ecu ?
    Les`s ecu`s are not "one suits all'
    he stated he saw 16.1 thats lean?
    saying a rod bolt seem like a strange failure, usually resulting in high rpm or incorrect torque setting from the get go.

    id love to know if you have anything to contribute or would you just rather attack anything i post? either is fine

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