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Thread: Ideal Blower WOT AFR Curve

  1. #1
    Member
    Join Date
    Jan 2008
    Posts
    57

    Default Ideal Blower WOT AFR Curve

    After putting together bits and pieces from other posts on here and ls1tech I've come up with a (hopefully) ideal WOT fuel curve for us centrifugal blower cars. This is for 8-10 psi on a stock motor. Advice from other posts include making the AFR 11.5 at peak torque ~ 5200 and lean it up to 12.0 at redline.

    Any comments?

    Code:
    1600	12.3
    2000	12.2
    2400	12.2
    2800	12.1
    3200	12.0
    3600	11.9
    4000	11.9
    4400	11.8
    4800	11.7
    5200	11.5
    5600	11.8
    6000	11.9
    6400	12.0
    2001 Camaro SS
    Built 370 LQ9, Ported 243s, D-1SC 14 psi. 691 rwhp, 643 rwtq
    Best time: 11.6@124 on nitto drags with a 2.1 60'
    "if you're gonna build a time machine into a car, why not do it with some style." Dr. Emmett Brown

  2. #2
    Member
    Join Date
    Jan 2008
    Posts
    57

    Default

    I'm going back to the dyno to shore up my PE table and was going to run with this AFR curve, unless anyone has suggestions...

    My last PE tweak was from a 3rd gear 50-110 mph run on the highway late at night and it's dialed in pretty good. Since 1st/2nd gears show much richer AFR I figured 4th would be lean the way I have it now. I'm going back to the track in a month or so and I want to make sure that 4th gear's fueling is good and safe.
    2001 Camaro SS
    Built 370 LQ9, Ported 243s, D-1SC 14 psi. 691 rwhp, 643 rwtq
    Best time: 11.6@124 on nitto drags with a 2.1 60'
    "if you're gonna build a time machine into a car, why not do it with some style." Dr. Emmett Brown

  3. #3
    Lifetime Member
    Join Date
    Aug 2005
    Posts
    710

    Default

    Personally, I wouldn't lean it back out, especially with a centrifugal that continues to build boost. With an N/A setup, I've seen a negligible difference in power from 11.5:1 and 12.5:1. With a boosted setup, the thermal protection provided is even more important.

  4. #4
    Member
    Join Date
    Jan 2008
    Posts
    57

    Default

    If the power difference from leaning out up top is negligible then I'll take it down a bit. I'll leave a little leanout in just because it makes the graph look cool...

    Here's a copy of my new PE table:

    Code:
    0	12.50
    400	12.48
    800	12.43
    1200	12.38
    1600	12.33
    2000	12.27
    2400	12.20
    2800	12.11
    3200	12.02
    3600	12.00
    4000	11.81
    4400	11.70
    4800	11.58
    5200	11.50
    5600	11.55
    6000	11.60
    6400	11.63
    6800	11.65
    7200	11.66
    2001 Camaro SS
    Built 370 LQ9, Ported 243s, D-1SC 14 psi. 691 rwhp, 643 rwtq
    Best time: 11.6@124 on nitto drags with a 2.1 60'
    "if you're gonna build a time machine into a car, why not do it with some style." Dr. Emmett Brown

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