Close

Results 1 to 6 of 6
  1. #1
    Join Date
    Apr 2014
    Posts
    12
    Rep Points
    13.0
    Mentioned
    0 Post(s)
    Rep Power
    0


    1 out of 1 members liked this post. Yes Reputation No

    question about calculations

    Tuning question using APR Mobile and measuring injection on time I get 9.897 ms at 4846 rpm this is work out to 4846/60 = 80.7 rps injector fires every other rotation 80.7/2 = 40.35 720deg rotations per sec. 1/40.35 = 720 degress every 24.78 ms. 40% duty cycle?

    OR and 7.269 ms at 7003 rpm 42%

    This seems low to me for WOT

  2. #2
    Join Date
    Mar 2010
    Location
    South Africa
    Posts
    1,320
    Rep Points
    1,955.5
    Mentioned
    37 Post(s)
    Rep Power
    0


    1 out of 1 members liked this post. Yes Reputation No
    Click here to enlarge Originally Posted by Lizotte Click here to enlarge
    Tuning question using APR Mobile and measuring injection on time I get 9.897 ms at 4846 rpm this is work out to 4846/60 = 80.7 rps injector fires every other rotation 80.7/2 = 40.35 720deg rotations per sec. 1/40.35 = 720 degress every 24.78 ms. 40% duty cycle?

    OR and 7.269 ms at 7003 rpm 42%

    This seems low to me for WOT
    The midrange is high. 10ms is more or less the limit.
    7 ms is happy place, is your fuel system upgraded? It may be so low at the top because you dropping boost and peaking in the midrange.

  3. #3
    Join Date
    Apr 2014
    Posts
    12
    Rep Points
    13.0
    Mentioned
    0 Post(s)
    Rep Power
    0



    Yes Reputation No
    My Low pressure is low think I got stuck with a 6.4 bar filter, swapping it tomorrow, I have an upgraded HPFP.

  4. #4
    Join Date
    Apr 2014
    Posts
    12
    Rep Points
    13.0
    Mentioned
    0 Post(s)
    Rep Power
    0



    Yes Reputation No
    What I am looking for is, are my calculations right or am I doing it incorrect.

  5. #5
    Join Date
    Jan 2010
    Location
    SoCal
    Posts
    119,426
    Rep Points
    32,105.4
    Mentioned
    2106 Post(s)
    Rep Power
    322


    Yes Reputation No
    I'm not even sure what we are talking about here.

    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
    : http://www.boostaddict.com/showthrea...r-kit-for-sale

  6. #6
    Join Date
    Apr 2010
    Posts
    4,614
    Rep Points
    3,236.6
    Mentioned
    24 Post(s)
    Rep Power
    33


    Yes Reputation No
    Duty cycle of injectors Lizotte is calculating and suspects it is lower then normal
    Some people live long, meaningful lives.

    Other people eat shit and die.

    I'm not racist, I hate everybody equally; especially fat people.


    Click here to enlarge

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may post replies
  • You may not post attachments
  • You may not edit your posts
  •