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  1. #1

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    Switching From Riva 50s to Bosch 48 Injectors

    Recently made the switch from Riva 50s to Bosch 48s. I had base pressure on the Rivas at 60 psi, per instructions. With the Bosch injectors, the 60 psi fouled the plugs on the first WOT pull. I did some research and it looks like I should set base pressure anywhere from 54 - 58 psi. Any recommendations?

    I have:
    XX Charger
    Riva ECU
    Riva RRFPR

    Eric


  2. #2
    Lightning1's Avatar
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    58-60 is what Riva reccommends, Mine is at 58 and I don't run rising rate since when it was hooked up, it ran too lean at idle and too rich at WOT.

  3. #3

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    Interesting. No rising rate at all? What psi does the 137 produce? The ski worked fine at idle and part throttle, just conked out on WOT. Anybody else not use the rising rate?

    Eric

  4. #4
    Mod less, ride more! troyheb's Avatar
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    When I had my 08 Px with an ET137x4, Riva ECU & 48's, I ran my base at 40psi, with the ref line connected. Everyones results will be different. You have to play around with the pressure, with the ref line disconnected and unconnnected untill you find what is right for your settup.

  5. #5

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    Yeah, I know everyone's set-up will be different. I just need to find a setting that will allow the ski to run and not shut off in the middle of the lake forcing me to swim tow it to shore while cramping up in the cold lake and then drag it through the shallow, rock and mosquito infested shin-busting water back to the ramp. I can fine tune it once I get it running OK.

    Eric

  6. #6

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    I was running 52-54 with the ref. line connected to intake manifold last year on my et 140 +2 with my riva ecu (9200 limit) and bosch 48s-- was getting quite a bit of gas in my catch can, but the ski felt great performance wise and never fouled a plug.

  7. #7
    Mod less, ride more! troyheb's Avatar
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    Quote Originally Posted by Gipper View Post
    Yeah, I know everyone's set-up will be different. I just need to find a setting that will allow the ski to run and not shut off in the middle of the lake forcing me to swim tow it to shore while cramping up in the cold lake and then drag it through the shallow, rock and mosquito infested shin-busting water back to the ramp. I can fine tune it once I get it running OK.

    Eric
    Sounds like you are not monitoring afr's.

  8. #8
    Nothin' better than Doo'in it! BigDaddyRXP's Avatar
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  9. #9

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    Hard to monitor AFRs when the ski doesn't run...

    Eric

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