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  1. #1
    oz_speed's Avatar
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    Mini Rude 48's or 42's

    Running a mini rude on an RXP with Bosch 48's and the A/F at idle and mid range is too rich. Want to keep this ski simple, as anybody run the mini rude with 42's and if so what A/F did you see.


  2. #2
    MSRXP's Avatar
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    Quote Originally Posted by oz_speed View Post
    Running a mini rude on an RXP with Bosch 48's and the A/F at idle and mid range is too rich. Want to keep this ski simple, as anybody run the mini rude with 42's and if so what A/F did you see.
    42's for the reasons you stated previously depending on other mods. With the 48's, pressure had to get down into the upper 30's and low 40's to get it right in the mid and top end on a stock ECU. Go with the 42's and the pressure will be in the mid 60's and idle mid and top end will fall in place easier than with the 48's if you are.


    ****This was observed on an 06 RXP, FIZZLE IC, MR, 42's,48's (Bosch) Riva RRFPR, 4" intake and other supporting mods on a stock ECU. So we decided to switch back to the 42's because of the base pressure dipping into the mid to upper 30's with the 48's****
    Last edited by MSRXP; 04-04-2012 at 10:18 PM. Reason: Ski Type and Mods done....

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    sniper300's Avatar
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    What ECU?, and what reg u running? i would keep the 48"s and run a BEGI with it!!

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    jpeconsult's Avatar
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    I ran 42's with the X SC, and 48's (and now 50's) with the MiniRude on a rrfpr.

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    Moderator Snoman's Avatar
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    Quote Originally Posted by sniper300 View Post
    What ECU?, and what reg u running? i would keep the 48"s and run a BEGI with it!!
    +1......

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    oz_speed's Avatar
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    Running Riva ECU and Aeromotive RRFPR at 56Psi with ref line. WOT 11.5 Idle is around 10.1
    I was thinking 42's may give me a leaner idle and mid range.

  7. #7
    Moderator Snoman's Avatar
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    Quote Originally Posted by oz_speed View Post
    Running Riva ECU and Aeromotive RRFPR at 56Psi with ref line. WOT 11.5 Idle is around 10.1
    I was thinking 42's may give me a leaner idle and mid range.

    Your running a Riva ECU with 48s AND a RRFPR?????You shouldnt need the RRFPR being the Riva ECU is mapped for 50s,AND you shouldn't be that rich at idle IMO....Are you sure they are 48s???

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    A smart admits!A wicked excuses!An idiot insists! mitsakosgt's Avatar
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    Quote Originally Posted by oz_speed View Post
    Running Riva ECU and Aeromotive RRFPR at 56Psi with ref line. WOT 11.5 Idle is around 10.1
    I was thinking 42's may give me a leaner idle and mid range.
    I have the same problem!I get like 10 on idle 13.5 mid and 12.7 wot!
    My set up is RIVA ECU,XX charger,bosch 48s,turbosmart regulator with line attached and 65 psi....
    I am thinking for bad fuel pump!!!

  9. #9
    sniper300's Avatar
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    The Bosch 48"s flow more fuel at low pressure than the Riva 50"s hence why they can be a bit rich at idle and mid range , So running a RRFPR helps to take some fuel out at idle a mid but its still not enough . I run a Riva with 48"s myself!! Your AFR looks similar to mine with my B kit before i installed the BEGI. The Begi trimmed everything up perfect and it is so easy to tune on the day if required.

  10. #10
    oz_speed's Avatar
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    Quote Originally Posted by sniper300 View Post
    The Bosch 48"s flow more fuel at low pressure than the Riva 50"s hence why they can be a bit rich at idle and mid range , So running a RRFPR helps to take some fuel out at idle a mid but its still not enough . I run a Riva with 48"s myself!! Your AFR looks similar to mine with my B kit before i installed the BEGI. The Begi trimmed everything up perfect and it is so easy to tune on the day if required.
    Looks like I am going to have to go with the BEGI set up, I was wanting try and keep it simple if possible as this is not my ski.

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