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  1. #1
    DaveC's Avatar
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    Riva ECU, Delphi 50s vs Bosch 48s ?

    Riva ECU with Delphi/Riva 50s or Bosch 48lb injectors. Basic setup with either injector and using a either a stock X charger or possibly the the Riva Pro X upgrade. Looking for info on what AFRs have looked like for you guys.

    I am sure the Bosch is a far better injector. But with the Riva ECU being mapped for the Delphi 50s they tend to work well together from what I have seen before. Just looking for current info on either combination.


  2. #2
    dnielsen's Avatar
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    With the proX charger you can't get enough fuel through those Delphi 50s to obtain propper AFR at WOT. You will need to raise fuel pressure beyond the point in which the 50s lock up (62-63 psi). The 48s will handle atleast 75 psi without a hiccup. I am really surprised that Riva still sells those things and recommends them for use in some of their sales pitches. I really can't see how they test these and don't catch the problem we see.

  3. #3
    Eric Ocman's Avatar
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    Ran a Riva ECU with bosch 48s for quite a while. Then swapped to bosch 55's and an LC ECU. The 50s are fine unless you raise the pressure from specs but I would opt for the Bosch 48's if I were you. They run a bit rich down low but have a superior spray pattern and can handle the higher pressures.

  4. #4
    Water4fire's Avatar
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    Well I tested my Rivas and they locked up at 65psi. I did not like that.

    BUT I ran a Pro X SCer with a NON rising rate of 62lbs and was perfect. They were fine.

    So for me it is just to much of a chance! That I would not take considering Bosch 48's are very nice and can handle up to a 2Rude and stuff.

  5. #5
    DaveC's Avatar
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    Thanks for the info guys !

  6. #6
    AtoMIC_OraNGE greenbullet's Avatar
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    i run riva ecu .. bosch 48s

  7. #7
    Banned User
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    Heard from numerous guys those Rivas are shit. Go bosch

  8. #8
    Mod less, ride more! troyheb's Avatar
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    I ran the 48's & Riva ecu with the X-upgrade on my 08 PX. My base pressure on my rrfpr was right at 40 psi with the ref line connected. Afr's were dang near perfect all the way through the rpm range. But, every ones set up will be different.

  9. #9
    monaroman76's Avatar
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    Quote Originally Posted by troyheb View Post
    I ran the 48's & Riva ecu with the X-upgrade on my 08 PX. My base pressure on my rrfpr was right at 40 psi with the ref line connected. Afr's were dang near perfect all the way through the rpm range. But, every ones set up will be different.
    Mines nearly identical, 2rude instead of Riva pro-x. 46psi base pressure with reference line attached, idle is still a bit rich, but it's good everywhere else.

  10. #10
    Having Fun jp1300r's Avatar
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    I couldn't use the RIVA ecu with my set up. Too rich at idle and midrange, too lean WOT would foul plugs in one ride, PITA. I tried what I had Bosch 42lb and Siemens 60lb at the time. Used a RRFPR with boost line hooked up of course. RIVA ecu map was done before all these big SCers came out.

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