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  1. #1

    Riva ECU for B-kit A/F #s (my results)

    OK, I decided to purchase the Riva ECU for my set up. I ran the ski today in Barnegate bay and used an LM1 Wideband Air Fuel Ratio Meter. Here's the link to the device I used. http://www.innovatemotorsports.com/products/lm1.php

    My ski is set up as follows: B-kit with blow off, 3 blade riva prop, Riva 05 ECU, Riva Rear Air, Riva intake, Riva Sponsons, Euro Block offs, Riva intercooler with filter, custom shorty rear exhaust with cut j-pipe and no baffles, Riva Valve train, Skat tripple bearing pump with 81.5mm venturi ring inserted, solid engine mount, Riva front flow thru hood for ventilation, cyberdyne boost guage, and ....(i think thats it)

    Todays weather looked like this:
    Fair

    Feels Like:67°Barometer: 29.84 in and steady Humidity:42%Visibility: 10 miDewpoint:41°Wind:Calm
    First I ran the setup above with 50# injectors and the A/F looked like this.

    Riva ECU with 50# injectors

    RPM A/F% Boost Notes
    1800 12.2 -9.6
    3000 -12.6
    4000 12.5 -8
    5000 12.7 -5.2
    6000 13.5 -3.8
    6500 0.02
    7000 1.6
    7500 4.2
    8000 14.1 6
    8600 14.4 12.2 Hitting Rev Limiter



    I did not get all the numbers as I was nervous that I was too lean. Also notice I need to add pitch to my prop as I am slamming the rev limiter.

    Next I ran 55# injectors and got these numbers:

    Riva ECU with 55# injectors

    RPM A/F% Boost Notes
    1800 10.6 -9.6
    3000 10.6 -12.6
    4000 10.7 -8
    5000 0.9 -5.2
    6000 11.5 -3.8
    6500 11.4 0.02
    7000 11.7 1.6
    7500 12 4.2
    8000 12.1 6
    8600 12.7 12.2 Hitting Rev Limiter

    As you can see this is better, but its not great. The weather will warm up which will help, but I also run in MUCH colder conditions. Todays water was about 58 degrees and we run in much colder water too. So I am concerned. I think everyone offered me their honest opinions based on their local riding conditions, but it gets cold here.

    I want to thank everyone for all their input, but I wish I had gone Rotax, the Riva ECU was a $1000 dollar mistake, plus I lost my warrenty
    Last edited by idizzy; 04-29-2007 at 08:27 PM.


  2. #2
    Site Admin Green Hulk's Avatar
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    WOW! thanks for that info. Its amazing how much air and water temps affect that.

    I use the same LM 1 wideband and my AFR readings with the Riva ECU and Rude Charger at 85 degree air temp and 83 degree water temps were 12.6 at WOT. It looks like 55 lb injectors are the way to go when it gets colder.

    Sorry you think going with the Riva ECU was a mistake!

    What kind of speeds did you see? How was the acceleration? Any difference in acceleration between the 50 and 55 lb injectors?

  3. #3
    ramnj's Avatar
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    Mike,

    Does that mean that when the temps get warm you will need the 50lb injectors?

    If so, that will suck.

  4. #4
    What kind of speeds did you see? How was the acceleration? Any difference in acceleration between the 50 and 55 lb injectors?
    I did not check speeds as I was only looking to ensure safe fuel ratios. Acceleration was HUGE. The 50# injectors were much snappier then the 55# injectors, which I assume is due to the low end richness with 55's.

    I am not sure about if I will need to change to 50's in the summer. I hope not. I may just sell this ecu and pick up a Rotax. I need to think about it. Its a nice ECU and it did retard the timing when I slammed the rev limiter, but I am concerned with these numbers. Are they safe plus am I loosing alot of performance due to the low end being rich.

  5. #5
    Site Admin Green Hulk's Avatar
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    Yea, i found the acceleration with the Riva ECU to be huge too. Much better than the Rotax.

    Concerning your low end richness..... were your figures taken just by holding steady at that RPM and looking at the LM 1 or were you under load at full throttle acceleration?

  6. #6
    The ratios were taken by holding the revs at the listed level and then reading the LM1 for about 5 - 10 seconds each time. I did it a few times to make sure I had it right.

  7. #7
    Quote Originally Posted by idizzy View Post
    The ratios were taken by holding the revs at the listed level and then reading the LM1 for about 5 - 10 seconds each time. I did it a few times to make sure I had it right.

    a data logger would be nice in this case

  8. #8
    Site Admin Green Hulk's Avatar
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    I would be real interested to see the numbers while the engine is under load (full acceleration)

    I have the LM 1 with Aux box and can datalog and record each run and play it back on the computer. Nils just sent me the wire harness to connect it all so once i get this 07 finnished up with Rude Charger / Riva ECU i'll share the data. Im also curious to test it with the 55's. I'll post that data too.
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  9. #9
    shhr's Avatar
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    WOW the boost numbers at 8000 are at 6 then go to 12.2 at 8600

    I am getting 11.5-11.8 at 8100-8150

    and I am getting 11.8 air/fuel with the stock ECU, fuel controller, 50`s and B-KIT at 8100 you are at 14 at 8000 that is a big difference

  10. #10

    data logger

    i should have known that jerry already had one


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