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  1. #1

    Safe AFR number on my mods?

    Hey guys

    The ski is 08 RXP-X and its already has Riva stg1 right now and im ready to order :-

    137 Engine Tech drop-in supercharger impeller with 3mm spacer
    RRPR necessary which includes fuel pressure gauge.
    60lb injectors:
    Riva 4" Rear air Intake:
    Riva Rear exhaust system:
    Rotax Racing ECU 8800
    RIVA Valve Train Upgrade
    Riva relocation intercooler kit
    light weight ferrea valves
    15/22 prop

    I'm using LM-1 ( wish u guyz can give me some tips how to u use it )

    What is the safe AFR i should tune my boat on idle, midrange and WOT!!

    BTW..The RRFRP will be set on 60psi

    Thanks in advance


  2. #2

    Join Date
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    Quote Originally Posted by FreakRXP1200 View Post
    Hey guys

    The ski is 08 RXP-X and its already has Riva stg1 right now and im ready to order :-

    137 Engine Tech drop-in supercharger impeller with 3mm spacer
    RRPR necessary which includes fuel pressure gauge.
    60lb injectors:
    Riva 4" Rear air Intake:
    Riva Rear exhaust system:
    Rotax Racing ECU 8800
    RIVA Valve Train Upgrade
    Riva relocation intercooler kit
    light weight ferrea valves
    15/22 prop

    I'm using LM-1 ( wish u guyz can give me some tips how to u use it )

    What is the safe AFR i should tune my boat on idle, midrange and WOT!!

    BTW..The RRFRP will be set on 60psi

    Thanks in advance
    11.9-12.4 wot

  3. #3
    Duke's Avatar
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    12.0 or less IMO. The Rotax Racing ECU has very aggressive timing and needs the fuel to keep everything cool when running pump gas with it.

    What questions do you have about the LM1?? Just calibrate the O2 sensor before you screw it in.

  4. #4
    Site Admin Green Hulk's Avatar
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    11.7 to 11.9 is your target AFR

  5. #5
    Site Admin Green Hulk's Avatar
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    11.7 to 11.9 is your target AFR

    With the RRFPR you will only be able to tune for wide open throttle. Your midrange will be what it's going to be. You'll probably end up somewhere in the high 13's at cruising speed which is perfectly fine and normal. The engine is not under a load.

  6. #6
    so with 60lbs injectors and RRFPR on 60psi with low/mid 70'sF the boat SHOULD be littel rich ( on safe side )...right?

    Thanks again

  7. #7
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by FreakRXP1200 View Post
    so with 60lbs injectors and RRFPR on 60psi with low/mid 70'sF the boat SHOULD be littel rich ( on safe side )...right?

    Thanks again

    It should be but it's always best to measure your AFR.

  8. #8
    meansvt00's Avatar
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    IMO in any supercharged application you want your air fuel to be below 12.0 to be safe.
    I would say between 11.5 -12.0

  9. #9
    meansvt00's Avatar
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    Quote Originally Posted by busa504 View Post
    11.9-12.4 wot
    i think 12.4 is a bit too lean IMO but im no tuner just speaking from experience with supercharged cars/trucks

  10. #10
    rxpdoo's Avatar
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    Quote Originally Posted by meansvt00 View Post
    i think 12.4 is a bit too lean IMO but im no tuner just speaking from experience with supercharged cars/trucks
    green hulk already mentioned to be below 12.0. you always have to take into account that the consumer gauges are in no way accurate.

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