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  1. #1
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Riva Pro ECU and 50lb injectors @ 8100rpm

    Anybody with knowledgeable input?

    Could I run a Riva Pro ECU and 50lb injectors, with a B-kit SC or similar, and current mods (see sig) then prop it so I kept it at or below 8100rpm.
    Why? So I don't have do a valve train upgrade!

    I think 80 is achievable keeping rpm standard at 8100.

    Or is the Riva ECU really designed to perform over and above stock operating rpm!

    Just asking?


  2. #2
    Once you get unhooked and the throttle is wide open you can possibly float a valve! To put to ya simply, there is no way you can keep in at 8100 rpm's without becoming unhooked in the chop! It's your call, but I wouldn't recommend a Riva ECU and SC3 without an lightweight train upgrade! Maybe 77-79 is more realistic at 8100! Not saying you can't obtain 80!

  3. #3

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    Why do you not want to do the valve train upgrade?

  4. #4
    RXP 260 X Short Course Veteran RXP244's Avatar
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    Fraser

    Its not that I don't won't to do the upgrade. I'm trying to look at economical ways of achieving speed increases. Reliability is a big deal to me though. That is a valid point to say there is no way to avoid the over revving of the engine with a riva ecu, but I do reguarly see 8400 8500 when unhooked now even with a stock ecu.

    The stock boat should pull 8100 all day long!? Why not try and increase speeds while staying with the stock rpms. I realise there will be a point where a rpm increase will be needed, but when? If I had more boost and more fuel, prop it back to 8100, I still need a way of controlling the fuel supply?

  5. #5
    Site Admin Green Hulk's Avatar
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    If you put that much pitch in the impeller to maintain 8100 RPM's you would be bogging the engine down. Acceleration would be terrible. These engines love to rev and make the most power above 8100.

  6. #6
    RXP 260 X Short Course Veteran RXP244's Avatar
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    So Jerry, reaching 80+ with a stock ecu that really does not like rev past 8100 is not realistic? I would like to stay with the stock ecu for now, but if I increase boost and fuel somehow (bigger sc and fuel controller etc.) I can't have the engine pulling past 8100 with a stock ecu. This is an endurance boat, it maintains max rpm for periods of minutes at a time over 2 hours. I had a 15/20 with lots of pitch turning 78-7900 @ 76.5mph and acceleration was still awesome! If only I could turn that prop to 8100, I think 80 would be close. I just need a bit more HP!

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