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  1. #81
    Veteran Member Three Rings rnagy86's Avatar
    Join Date
    Apr 12 2012
    AZ Member #
    91729
    Location
    Budapest/Hungary
    Items for Sale

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    It is hard to overlay these logs on each other so here is two snapshots.
    The first one is with N249 plugged in, the second is N249 disconnected.
    Both tests were done with two proper DVs with the a piston that does not
    cover any of the ports when fully open.

    BTW: The map that you are looking for SDLDSUA and its axis calculation in ASM.
    Both the ASM axis calculation is done and the values are also divided by two,
    however looking at the M-box, the SDLDSUA values are higher by default in
    that file.

    600g/s, 1.98 FATS, 5.6 seconds 100-200 (1850kg)



    Last edited by rnagy86; 12-08-2017 at 08:26 AM.

  2. #82
    Veteran Member Four Rings wbrunner23's Avatar
    Join Date
    Jun 07 2012
    AZ Member #
    94796
    My Garage
    1955 Johnson QD-16
    Location
    Ashland, OR
    Items for Sale

    Boost spike is greater with n249 unplugged, which makes sense, but the spike looks almost identical to the spike with the n249. I agree with previous suggestions that it is actuation speed that is causing the spike.

    You need something that can open the DVs quicker

  3. #83
    Veteran Member Four Rings V1nny's Avatar
    Join Date
    Dec 04 2012
    AZ Member #
    105252
    Location
    Arlington VA

    I had APR original diaphragm (not piston) DV for a while, but after going stage 3, they did not hold more than 22psi, so I called APR, and they sold me heavier springs for about $20. Very happy so far, no need for maintenance ever, also opening faster than any piston.
    https://www.goapr.com/products/r1.html
    https://www.ecstuning.com/b-apr-part.../z1001791~apr/

  4. #84
    Veteran Member Four Rings jibberjive's Avatar
    Join Date
    Jan 11 2007
    AZ Member #
    14790
    My Garage
    01.5' S4, 04' A4 USP, 04' CRF450r
    Location
    Salt Lake City, Utah

    It looks like you've verified/logged everything, except for the final thing that actually actuates the valve. Do you have an aftermarket boost/vacuum sensor that you could use to log the actual amount of vacuum applied to the DV's during driving/operation? For example, I have a Zeitronix setup that I use, which could integrate that vacuum data into the logs.

    Also, are your vacuum lines all OEM or are some aftermarket?
    ** GT2860R-7 S4 Build Log--

    FOR SALE:
    --JHM DELRIN SHIFTER STABILIZER BUSHING (LATE STYLE)--


    LOOKING FOR:
    --Early Style 2.7t Block "AE"
    --Your Broken/Sheared OEM Axles--


  5. #85
    Veteran Member Three Rings rnagy86's Avatar
    Join Date
    Apr 12 2012
    AZ Member #
    91729
    Location
    Budapest/Hungary
    Items for Sale

    Quote Originally Posted by jibberjive View Post
    It looks like you've verified/logged everything, except for the final thing that actually actuates the valve. Do you have an aftermarket boost/vacuum sensor that you could use to log the actual amount of vacuum applied to the DV's during driving/operation? For example, I have a Zeitronix setup that I use, which could integrate that vacuum data into the logs.

    Also, are your vacuum lines all OEM or are some aftermarket?
    Yes all lines are OEM. Already measured vacuum there and at the vacuum reservoir during driving. I have -.5-6 bar vacuum at the reservoir at WOT and that goes
    fine to the DVs.

  6. #86
    Veteran Member Four Rings
    Join Date
    Sep 11 2009
    AZ Member #
    47633
    Location
    NE
    Items for Sale

    Here is a graph from some old log b_ldsua as "Diverter Active". I rdrop the throttle on sample 401. I would suggest logging throttle angle as well, maybe there is some anomaly there.


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