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  1. #1

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    My 38LBs injectors run richer than my 42s

    I just installed my stock 38s and they are running richer than my 42's. I suspect I may have gotten the RIVA 50 pound injectors that require the RIVA racing ECU for proper calibration. The 42's have an odd number on them. 6294 17113798-38. My fuel pressure was 60 PSI at idle.

    42's 38's
    1770 RPM AFR 15.02 14.39
    2000 RPM AFR 14.96 14.91
    2500 RPM AFR 15.33 15.21
    3000 RPM AFR 15.45 13.91
    3500 RPM AFR 16.43 14.17
    4000 RPM AFR 16.16 15.5
    4500 RPM AFR 16.74 15.91
    5000 RPM AFR 16.08 15.17
    5500 RPM AFR 15.55 1 5.10
    6000 RPM AFR 14.32 14.26
    6500 RPM AFR 14.32 14.26
    7000 RPM AFR 14.26 13.67
    7500 RPM AFR 13.48 13.36
    7800 RPM AFR 13.72
    7810 RPM AFR 13.42


  2. #2
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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    By looking at your a/f numbers... you need at least 60's then

  3. #3
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    wow wouldnt run it in those numbers too long, may not have much piston left if ya do!

  4. #4
    rick xp's Avatar
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    Those numbers look fuked.

    You got something else going on and has nothing to do bigger injectors etc.

    How old is the sensor?

    Where is mounted?

    I have never seen afr in the 16's before at idle, etc.

    I would suspect its a dodgy sensor.

  5. #5

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    Rick XP, New sensor free air reading 20.9. Installed in top of Jpipe. We have 2 sleds showing simalr readings. I still suspect the 42s are the RIVA 50's that require a special Racing ECU?? I have order new 42's Bosch 0280155968 Green Giants.

  6. #6
    rick xp's Avatar
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    Quote Originally Posted by Helinut View Post
    Rick XP, New sensor free air reading 20.9. Installed in top of Jpipe. We have 2 sleds showing simalr readings. I still suspect the 42s are the RIVA 50's that require a special Racing ECU?? I have order new 42's Bosch 0280155968 Green Giants.

    That is starting to sound impossible.

    If its that lean on 50's then its going to be worst on 42's.

    There is no way on this earth you can have an idle at 15-16 etc.

    It wouldnt idle at all.

    Most cars idle around the 13-14 mark and any less and they stall.

    To give you an idea.

    You can run the 50's on the stock ecu no problem but we run a base pressure of some where around 45 PSI as it is way too rich at idle. Even at 45 psi it can still be like in the 10's.

    I am still saying that it is a faulty sensor and would almost bet money on it.

  7. #7
    masta2000's Avatar
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  8. #8

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    I still think something is up with the 42's. look at the readings at the beginning of this thread. The 38's run richer than the 42's. I will know soon enough when I replace the 42's. If that still shows too lean I will get a new sensor.

  9. #9
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Helinut View Post
    I still suspect the 42s are the RIVA 50's that require a special Racing ECU??
    50 lb injectors are 50 lb injectors regardless of ECU. The Riva ECU doesn't make the injectors flow 50 lb hr, it's just that the Riva ECU is mapped to use 50 lb hr injectors.


    Quote Originally Posted by Helinut View Post
    If that still shows too lean I will get a new sensor.
    I think something funny is going on with your AFR setup. If you are getting numbers that lean at idle with the stock injectors something is wrong.

  10. #10
    speedskixp's Avatar
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    If they are the riva style injectors they will go extremely lean at idle at 60lbs of pressure and if you turn the pressure up to 65 at idle they will not flow at all with some ecu's and the boat wont even start.. Turn the pressure down from 60 and they will get richer . Try it and report back.
    They cant handle the pressure and dont react fast enough for the short duty cycle at idle. Almost any injector will idle richer at 60lbs than the riva style. I've tested this in a couple different occasions with the 50's and assume the 42's are'nt much different in this matter. When you put bosch or any other 50's with the riva ecu they idle rich.

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