AFR vs ECT

Discussion in '1994 - 1995 Specific Tech' started by toyman, Jun 16, 2009.


  1. toyman

    toyman SN Certified Technician

    Joined:
    Jul 20, 2007
    Messages:
    1,833
    Likes Received:
    41
    Trophy Points:
    49
    Location:
    Vernon BC
    Whenever I change the AFR to 14.7 at idle and low load the ECT increases to about 220* vs 195* at AFR 14.0. Ambiant air temp is about 80*. Does this make sense? Low fan is on at 190* and high at 220*. I know that the leaner burn will be hotter but this seems out of whack. I'm using 94 octane fuel if that makes a difference. Not certain if timing is also a variable in this equation.
    #1
  2. shoua50

    shoua50 New Member

    Joined:
    Feb 19, 2010
    Messages:
    17
    Likes Received:
    0
    Trophy Points:
    0
    too lean at idle for boosted combo. set afr at 13.5 at idle and 14.5 while cruising. u get no heat dissapation at idle, that's why ect is 220, while cruising u can run 14.5 afr due to air flow to help control temp.
    #2

Share This Page