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  1. #1
    800AMSOIL4U's Avatar
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    Riva Racing 8650 ECU & Et 137-4 Supercharger what injectors & fuel pressure is needed

    I have an 08 Rxtx 255 hp with a Riva Racing 8650 ECU., Et 137-4 Supercharger Rising rate fuel pressure regulator. I assume I need the 50lb Bosch injectors. What is the static fuel pressure I need to set it at when I run it using my manifold boost pressure to increase my fuel pressure? Thanks I have been looking in the search and have not been able to find the answer.
    Last edited by 800AMSOIL4U; 09-12-2019 at 01:16 AM.

  2. #2
    SplishSplash's Avatar
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    I would recommend you get an O2 sensor but to get the machine up and running, 58 to 62 PSI will get you there. 58 Seems to be the static pressure Riva sets for all it RRFPR kits.
    50 lb injectors may be a bit much, the 42's should be ok.
    Be sure to set it with power on, ski off.
    Is yours a 215 or 260 to begin with?

  3. #3
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    I use the 48# Bosch red colored injectors for that Riva 8650 rpm ecu..........
    Good Luck!!!!!!!!!!
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  4. #4
    Quote Originally Posted by REID2168 View Post
    I use the 48# Bosch red colored injectors for that Riva 8650 rpm ecu..........
    Good Luck!!!!!!!!!!
    That's what I used as well

  5. #5
    800AMSOIL4U's Avatar
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    Oops sorry 2008 Rxtx w a stock intwrcooler. i also have some 2012 48 lb injectors i can use. I do have an AFR to check. It was pig rich with 52 injectors. I wanted to go off boost so it raised fuel pressure that way.

  6. #6
    800AMSOIL4U's Avatar
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    sorry it is a 255 08 RXTX


  7. #7
    800AMSOIL4U's Avatar
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    ttt?

  8. #8
    dcuhpw's Avatar
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    I’m assuming you are referring to this ecu: https://www.performancecatalog.com/R...rs11850-01.htm
    if so, they are 50lb Rochester injectors. The fuel map is based on stock fuel pressure (58lbs). The ecu should be good to go with those injectors and the the 137+4 wheel since that is essentially the stage 3 combo minus upgraded intercooler. Those injectors (50lb Rochester) are fine but don’t run over stock fuel pressure or they get finicky.

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