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  1. #1
    Vern's Avatar
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    Riva Stage 3 dyno results are up

    http://rivaforums.com/eve/forums/a/t...4/m/5751041263

    285 hp at 8400 rpm ... and check out the A/F ratio, higher, in the 13s all the way ...


  2. #2
    8580 it made 295 thats good if it true

  3. #3
    Site Admin Green Hulk's Avatar
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  4. #4
    Looks like the new dyno is more accurate or something. The stage 2 shows a decrease in hp after 8100.
    Can anyone explain why the stage 3 continues to go up and the old info for stage 2 goes down.

    I don't understand the old one.

    Also is the higher A/F the better ? I thought 12 was the magic number. Does this mean there is room for more boost, with the A/F ?
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  5. #5
    Site Admin Green Hulk's Avatar
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    More boost would just make it leaner than it already is.

  6. #6
    so 13 is lean , 11 is rich ?

  7. #7
    Site Admin Green Hulk's Avatar
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    Yes!

    Lower numbers = rich
    Higher numbers = lean

  8. #8
    Quote Originally Posted by Kinchyle
    so 13 is lean , 11 is rich ?
    Correct...PR...

  9. #9
    I thought people were noticing leaner A/F ratios in the lows and mids and it actual getting richer with the higher rpms. This shows a gradual increase with slight fluctuation not usual from peoples A/F posts. And this is with 50lb injectors. Is it the ECU ?

    This is just throwing me off and I'm already ignorant when it comes to this stuff.

  10. #10

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    Well PEREFCT air fuel ratio in the car world is 12.8-13.2. When we are running turbos on the street we like to see air fuel no higher a number than 12-12.5 to 1 . Leaner air fuel ratios like 13.5 - 13.8 to be sure will produce more power to a point BUT the engine is on the verge of being too lean. Perhaps watercraft are different but probably not much since they are all 4 strokes. In Nitrous applications 12.5 is about as lean as you want to see with premium fuel.

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