Announcement

Collapse
No announcement yet.

A/F ratios when in boost

Collapse
X
 
  • Filter
  • Time
  • Show
Clear All
new posts

    A/F ratios when in boost

    I am going to be tuning my car soon and would like to know at what point should the a/f ratios get rich. I am planning on going to 11.5 a/f but when I am running say 3lbs of boost going towards 18lbs should I be running 13.1 a/f or so and gradually get richer the more boost that I am running. This will be my first time tuning a car and I want to do it right.
    bp swapped escort lx, gtr ecu, gtr intake manifold, A code VAF, rx7 460cc injectors, ky clutch, holset hy35 turbo on 8lbs, 38mm tial wastegate, ramhorn manifold, full 3 inch ss exhaust, walbro 255 fuel pump

    #2
    Sounds about right. My fuel curves have never been that accurate though and I haven't blown it up yet, I just sorta aimed for 11-12:1 pretty much..maybe the newer ECU's are easier to tune? Start out rich across the board and *gradually* lean it out. You wanna start running rich by 6-8psi. Once you get that dialed in, work on timing...
    Last edited by jay; 07-03-2010, 07:03 AM.
    '90 AWD Protege, full GTR drivetrain swap, ~320 whp daily driver, RIP, and
    '90 AWD Protege, yet another GTR swap, Open class rallycar with a Toyota GT4 gearbox swap, thus crossing the line between hobby and mental illness. And a Brabus E55 K8, removing all doubt.
    http://www.wihandyman.com/forum/vbpi...?do=view&g=110
    http://www.cardomain.com/ride/2599486

    Comment


      #3
      heres a video when I was 1st dynoing my BP-T setup.. power sucked cuz of stock 1 7/8" exhaust @ 8psi at the time, but AFRs are great


      94 Pro LX- 3-hole. Familia seats, Infini Corners, Familia Grille, Familia Rear Garnish w/Rear fogs EDM Glass headlights,
      MSP Mazdaspeed Muffler,Mazdaspeed front strut bar,'00 Pro ES wheels, Neuspeed Springs,GR2s, MX3 wheel, MX3 Tall armrest

      Comment


        #4
        0psi and above I would target for 12.5-12.6 AFR. At 10psi I would move to 12 AFR. After 15 psi I like to move to 11.5-11.8 AFR to deal with the extra heat.

        Comment


          #5
          I shoot for 11.3 in boost, as far as acceleration enrichment goes, I see 12.5 by 0psi and 11.8 by 5psi and 11.3 by 12psi. This is compensating for the recent summer heat 90+ degree days. (havent re-tuned for cooler air now). Now with cooler IATs in the 50s-60s I shoot for 11.8s at 12 psi.
          94 1.8/Garrett 12psi/MS1/AEM UEGO/RX-7 460s
          Still not 230+whp...

          Comment

          Working...
          X