1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

car bogs going into boost

Discussion in 'Forced Induction' started by sneezy, Oct 20, 2004.

  1. sneezy

    sneezy Junior Member

    Messages:
    5
    Likes Received:
    0
    Joined:
    Sep 14, 2004
    ok i have a fully built h22a4 and when the car is building boost,well as soon as the guage says 0psi the car bogs down but when it is in the -10 -20 or any where before the guage says 0 car runs good then as soon as it it 0-5psi the car just bogs down really really bad then as soon as i hit anything above 5psi car pulls hard and runs great up to like around 15psi or so then i here this crackling sound from the motor i dont't think it is detnation because my a/f ratio guage says am on the rich side.so just to be sure i add more fuel in the upper rpm by 4% and the car run like shit turbo spools like crazy but car don't even pull when i add more fuel.so if anybody had this problem before what can i do to get the car to run right?
    Thanks.
     
  2. b16coupe

    b16coupe Senior Member

    Messages:
    203
    Likes Received:
    0
    Joined:
    Oct 29, 2003
    Location:
    anderson, S.C.
    I had the same problem when I made my first basemap except it happend at any positive pressure. My problem was that i forgot to set the ignition table for boost and anything above 0psi would make my ignition fire at 6 degrees after top dead center. But that is weird that it does ok from 5-15 psi though. Have you looked at the ignition timing for 0-5 psi?
     
  3. sneezy

    sneezy Junior Member

    Messages:
    5
    Likes Received:
    0
    Joined:
    Sep 14, 2004


    well i have the msd digital 6 plus with ignition retard activated by a 12v switch
    and the way we have it hooked up is at full throttle it retards the ignition by 4 degrees.but even at half throttle it does the same thing.oh i forgot to mention
    when it bogs it does that at exactly 4000 rpms then by around 5500 or so the car instantly starts to pull then when i hit around 15psi thats when that crackling noise starts.
     
  4. sneezy

    sneezy Junior Member

    Messages:
    5
    Likes Received:
    0
    Joined:
    Sep 14, 2004

    turbo is a t3/t4oe 60 trim 57a/r
     
  5. [Freemantle]

    [Freemantle] Senior Member

    Messages:
    282
    Likes Received:
    0
    Joined:
    Apr 3, 2004
    Location:
    Vero Beach, FL
    What fuel management are you using?
     
  6. sneezy

    sneezy Junior Member

    Messages:
    5
    Likes Received:
    0
    Joined:
    Sep 14, 2004

    I am using a set of 440cc injestors from RC
    255lph in tank pump
    aem fuel rail
    aem adjustable fuel pressure regulator
    and the v-afc
    my fuel pressure is set at 55psi and 60 under load
    my settings on my v-afc is as follows:


    V/T UNMT:
    hi<<L:+3%
    Lo<<H:+1%

    TH-Point:
    LO HI
    35% 80%

    NE-P:HVT
    NE1:4000RPM
    NE2:4500RPM
    NE3:5OOORPM
    NE4:5500RPM
    NE5:6000RPM
    NE6:7000RPM
    NE7:8000RPM
    NE8:9000RPM

    NE-P:LVT
    NE1:1000RPM
    NE2:2000RPM
    NE3:3000RPM
    NE4:4000RPM
    NE5:5000RPM
    NE6:5500RPM
    NE7:6000RPM
    NE8:7000RPM

    NARR LVT
    3000 +1%
    4000 + 3%
    5000 + 3%
    6000 +5%
    7000 +5%

    WIDE:
    from 3k to red line it's + 5%
     
  7. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    welcome to vafc hack hesitation.

    the vafc is your problem.
     
  8. UDT

    UDT Senior Member

    Messages:
    2,015
    Likes Received:
    0
    Joined:
    Sep 24, 2003
    Location:
    california


    I agree. And That turbo with that much boost you should have all ready had a stand alone fuel management. Its amazing how many people try and try to skimp on there management. Im sure you have heard but guess what........... your gonna hear it again hondata or if you still wanna skimp uberdata


    Ha my memeber numbers higher then your post count B :p
     
  9. [Freemantle]

    [Freemantle] Senior Member

    Messages:
    282
    Likes Received:
    0
    Joined:
    Apr 3, 2004
    Location:
    Vero Beach, FL
    I figured it was the hack, but I didn't see a missing link in his setup...

    That's a whole new level of VAFC hesitation.
     
  10. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home
    you don't use a missing link with the hack....
     
  11. beerbongskickass

    beerbongskickass Senior Member

    Messages:
    497
    Likes Received:
    0
    Joined:
    Apr 28, 2004
    Location:
    Longview WA
    Built h22 and an afc for fuel management? :blink:
     
  12. StealthMode

    StealthMode Kung Foolin'

    Messages:
    2,150
    Likes Received:
    2
    Joined:
    Mar 12, 2003
    Location:
    Thornton, CO


    but could you?
     
  13. [Freemantle]

    [Freemantle] Senior Member

    Messages:
    282
    Likes Received:
    0
    Joined:
    Apr 3, 2004
    Location:
    Vero Beach, FL



    I wouldn't run the setup so I wont defend it, but i've seen it done before.
     
  14. sneezy

    sneezy Junior Member

    Messages:
    5
    Likes Received:
    0
    Joined:
    Sep 14, 2004

    where can i find a aem system for a really good price?
     
  15. [Freemantle]

    [Freemantle] Senior Member

    Messages:
    282
    Likes Received:
    0
    Joined:
    Apr 3, 2004
    Location:
    Vero Beach, FL
    H-T Classifieds? If you are going for the stuff taht requires $, you really can't talk the dollar amounts down. The hondata basic hardware costs less than your VAFC.
     
  16. handlebarsfsr

    handlebarsfsr Senior Member

    Messages:
    353
    Likes Received:
    0
    Joined:
    Jul 10, 2003



    all a vafc does is modify the map signal, so if you put a missing link in there that bypasses the map, you defeat the vafc.
     
  17. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home


    sure- but it won't do anything. keep the $65.
     
  18. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home



    I wouldn't run the setup so I wont defend it, but i've seen it done before.
    [post=405764]Quoted post[/post]​
    [/QUOTE]

    there's 2 ways to run the vafc.

    Normal mode:
    standard injectors, fmu, missing link, vafc set to add a little bit of fuel up top/in boost

    Hack:
    large injectors, no missing link, vafc set to negatives to tune down the large injectors off boost, and gradually working its way to 0 up top/in boost to use the full injector's fueling without flodding at idel.
     
  19. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home


    not excactly... whehter you bypass the map or not with the missing link, the vafc will still send the ecu its setting that you manually set it to.
     
  20. pissedoffsol

    pissedoffsol RETIRED

    Messages:
    49,693
    Likes Received:
    53
    Joined:
    Sep 28, 2002
    Location:
    Retirement Home


    aems used ~~ 800
    new, 1100-1300 ish

    my buddy has the first one ever for sale on ebay right now.
    http://cgi.ebay.com/ebaymotors/ws/eBayISAP...&category=33597

    hondata, with everything you need to tune your own car, chip burners, etc etc (minus a laptop) 950-1000
     
Verification:
Draft saved Draft deleted

Share This Page