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  1. #1
    moparguy's Avatar
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    300 E.T 142 tuning

    Just got my 300 back together, et142, all supporting mods, running the riva stage 4 tune. RRFPR set at 58lbs. Afr at idle is 13.9 to 14.2, mildly applying throttle on hose raising it 3000rpm, I'm seeing 14.6. I know is waaaaay to lean, so do I bump the fuel pressure? Switch it to rising? Right now it's so lean I'm afraid to even put it in the water to log it and dial it in. Help!!!!
    Last edited by moparguy; 07-31-2018 at 04:05 PM.


  2. #2
    boost junkie skidoochris's Avatar
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    Quote Originally Posted by moparguy View Post
    Just got my 300 back together, et142, all supporting mods, running the riva stage 4 tune. RRFPR set at 58lbs. Afr at idle is 13.9 to 14.2, mildly applying throttle on hose raising it 3000rpm, I'm seeing 14.6. I know is waaaaay to lean, so do I bump the fuel pressure? Switch it to rising? Right now it's so lean I'm afraid to even put it in the water to log it and dial it in. Help!!!!
    14+ at 3000 is no big deal
    its lean but it wont hurt anything because your still in vacuum
    even at 0psi 14s are not going to give you max power
    but its not a melt down
    13s at low boost is also lean but again not a melt down
    the seadoo SC does not make any real boost untill 6000+
    use fuel psi tuning as the last resort

  3. #3
    moparguy's Avatar
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    Quote Originally Posted by skidoochris View Post
    14+ at 3000 is no big deal
    its lean but it wont hurt anything because your still in vacuum
    even at 0psi 14s are not going to give you max power
    but its not a melt down
    13s at low boost is also lean but again not a melt down
    the seadoo SC does not make any real boost untill 6000+
    use fuel psi tuning as the last resort
    Thanks for the info, my worry is if at 3000 I'm already mid 14s. Then at 5k? Should be leaner, I guess I should email Jesus and ask him to adjust it and richen it up a bit. Before I put it in the water and start logging. Or should I bump the fuel pressure up to 60lbs?

  4. #4
    www.eastcoastpwc.net Scott's Avatar
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    Here’s a video of my ski and the 142mm, Don’t mind the upright video while filming. Was a bitch to hold on 1 handed and film

    Current mods
    142mm
    RRFPR static @ 58
    IMUK
    Riva intake
    Retainers / springs
    Dashpac
    VT11’s

    Jesus sent me a file basis my above mods versus the OTS Riva tune.


  5. #5

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    add more fuel on the tune or scale injectors up. Do you have the mapedit? if not ask jesus to scale injectors up to let say 35 or 36 ( i cant remember if high is more fuel or less) but he will know

  6. #6
    moparguy's Avatar
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    Thanks for the quick replys and great advice as always guys. Gonna fire a email off to jesus in 10 minutes. Fingers crossed he works on Sunday's, otherwise just the TX this weekend
    Man that videos just teasing me Scott, trigger fingers getting itchy

  7. #7

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    Quote Originally Posted by moparguy View Post
    Thanks for the quick replys and great advice as always guys. Gonna fire a email off to jesus in 10 minutes. Fingers crossed he works on Sunday's, otherwise just the TX this weekend
    Man that videos just teasing me Scott, trigger fingers getting itchy
    put enough race gas in to get you to high 90s-100 octane and run at 500 rpm increments and record your afr readings. If you are not close to 12 afr at full boost, I’d be concerned. Below boost mid to high 13s is very normal. 14s is not normal from what I’ve seen. Obviously logging is the way to go but the above will give you a good idea.

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  9. #8
    moparguy's Avatar
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    Quote Originally Posted by DinoMite View Post
    put enough race gas in to get you to high 90s-100 octane and run at 500 rpm increments and record your afr readings. If you are not close to 12 afr at full boost, I’d be concerned. Below boost mid to high 13s is very normal. 14s is not normal from what I’ve seen. Obviously logging is the way to go but the above will give you a good idea.
    Should I mess with my static and raise it 2lbs or just adjust the tune?

  10. #9
    ptscon's Avatar
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    If you can adjust tune do that, only time you should touch pressure is if your boost level breaches injectors minimum working pressure.

  11. #10

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    Quote Originally Posted by moparguy View Post
    Should I mess with my static and raise it 2lbs or just adjust the tune?
    If the tune is off across the board I’d bump up the pressure, obviously i wouldn’t want to be fixing one spot in the map at the expensive of other spots. If that’s the case the map has issues and you’ll need to fix it in the map.

    You need to go run it under load and record the afr/rpm/boost and see where it’s at. I wouldn’t adjust anything until you do that.

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