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  1. #1

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    Question Big weather fluctuations and performance

    2011 RXT 260, full riva stage 3. Springs, retainers, and flywheel bolts upgraded. Stock internals otherwise.



    How high of RPM's can I safely go with this setup?

    I am currently using the canned stage 3 8650 tune from riva/vtech.

    I have my sweet spot setup with the 5mm spacer, 85.5mm venturi, and untouched 15/19r impeller.

    During the mid-summer months (85 degrees, 60-70 degree dewpoints) I am running about 8400-8450 rpms.

    I took it out one random cold day (65 degree air, 55 degree dewpoint) and it was all over the 8650 limiter. I added 3mm of spacers to get down to 8600.

    Since it's only getting cooler (today is 67 degrees, and 51 degree dewpoint. The tuning calculator in a stick thread puts me at 101% of engine power today) what is an easy way to keep my RPM's in check, and not be out of the sweet spot of my pump?

    Simplest would be adding spacers. But most likely at the sacrifice of top speed.

    Would adding pitch be the correct route? I would have to remove spacers during the mid-summer to compensate for weather.


    Or can I contact Jesus and have him raise the limiter to say 8800 and still be safe with my current setup?


    TL;DR: How can I keep my RPM's in check the easiest with big weather fluctuations without hassle when just going for a short ride?


  2. #2
    moparguy's Avatar
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    Are you monitoring your afrs? And what are they?

  3. #3

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    Quote Originally Posted by moparguy View Post
    Are you monitoring your afrs? And what are they?

    With dashpac. At WOT yesterday I saw normally about 12.0-12.2. With a spike to 12.5. At 50mph (using eco mode) I saw mid 13's.

    Seems a little lean across the board. Maybe increase fuel pressure some to compensate?

    I'll put my gopro on next time to record the dashpac screen.


    Air temp: 65
    Dew point: 49
    Water temp: 75
    Elevation: 660ft

  4. #4
    Bob 1tommygunner1927's Avatar
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    83mm nozzle (or ring).....or a second pump with a larger impeller.

  5. #5

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    Quote Originally Posted by 1tommygunner1927 View Post
    83mm nozzle (or ring).....or a second pump with a larger impeller.
    I do still have my OEM 83mm nozzle. I am not interested in swapping pumps and such multiple times per year.

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