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  1. #1

    Join Date
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    Looking for help AFR wise

    Here is my set up:
    8100 ECU only turning 7800
    ET137 (old style) slip is good. makes between 11 and 13lbs of boost
    Ebay IC
    Walbro fuel pump
    42 lbs injectors (not sure who made these)
    RRFPR I have had 2 different ones in the ski thinking the RRPR was the problem
    4" DIY intake. I tried it with and with out an air filter about the same but I make a little more boost with out.

    I cant seem to get my AFr's low enough to be safe. Mine are 12.2 to 12.6 mid range and top end. I have adjusted the fuel psi for 35 psi to 80 psi at idle and I get the afrs numbers into the 11's. I pulled the plugs and the center and the rear look good but the from looks LEAN. Any suggestions I am thinking the fuel pump or the injectors are not cutting it. I am going to a compressing check tonight to make sure its not hurt. Oil level is spot on it doesnt smell gased out at all it looks almost new.


  2. #2
    Moderator Snoman's Avatar
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    Were did you get your fuel pump??Was it off E-bay or from a repitable dealer.....If you got it off E-bay you might have got a cheap knock off one that is failing....i had a stock fuel pump go bad on the wifes ski and it acted the same way

  3. #3

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    I got it from Slow 91 on the forum. It was new.

  4. #4
    h2jim's Avatar
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    You may have to add a Begi.

  5. #5
    speedskixp's Avatar
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    42's are maxed with the 137. Going top need 48's with a begi, cmd, or something else to control fueling to clean up idle and mid.

  6. #6
    Eastside Powersports Slow 91's Avatar
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    Also, there was a thread on here about those knock off Bosch 42's that would lock up. Might want to search for that thread as well.

  7. #7

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    Thanks Slow 91. I wonder about the injectors also.

  8. #8
    Eastside Powersports Slow 91's Avatar
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    Quote Originally Posted by Lvnspeed View Post
    Thanks Slow 91. I wonder about the injectors also.
    if you'd like you can send me the injectors and i can text them at 80+ psi and see if they are locking up?

  9. #9

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    intersting idea. I havent tried the injectors over 80 yet. Do you think with the set up I have it could really call for this much PSI?

  10. #10
    Avi8tor's Avatar
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    There are many different ways to ski a cat. One option to consider is a powercommander which gives you great control over your fuel curves as long as you dont run out of dutycycle of your injector. (for example 42 inj with 137 sc at wot could be operating at 100% duty cycle with stock fuel pressure)

    I set idle afrs at 13.5-13.8 and keep that afr until start seeing boost where I'll start dropping afr. At 3psi boost its down to 13 and from there linearly drop down to 12.2 afr wot with my stock x charger and ecu or down to 11.6 with my rude2 charger and modified ecu.

    In addition to that for safety at 6000 rpms I set in a rich cruising where its cruising at 12.5 afrs ( did this as a safety incase I get ahold of bad gas or have to refill with low octane while on water to get back to dock) below 5999 and above 6001 rpms it will start leaning back out to where below 5750 and above 6250 its completely back on my desired afrs.

    Another benefit is can leave my 60lb injectors in and easily change fuel maps depending on what sc /ecu combo Im going to run. All this is without a begi or rrfpr.
    (note: I am new to tuning seadoo supercharged engines so dont take what I do as gospel)

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