08-09-2007, 10:06 PM
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| Senior Member
Join Date: Jul 1999 Location: Guilford, NY
Posts: 558
Car: 1988 IROC-Z Engine: 350 TPI Transmission: 700R4 w/TransGo Axle/Gears: BW 9-bolt w/3.73s | Commanded AFR vs actual AFR at WOT...
Just wondering how important it is to have your commanded AFR (tables) match your actual AFR as recorded from a WB O2. I know many folks here using WBs, and I think most people trust them. I have the IM LM1, with it permanently installed in my ride.
At a recent 1/4 mile track session, I logged several WOT AFRs in the 13.3 to 13.8 range. I didnt get any laptop data, since I had some problems with it. But my commanded AFR was 12.41 as calculated via the 2 tables. I know I am supposed to be around 12.5 for optium WOT AFR, so i got some work to do. I think I can fix that.
I did recently read (and re-read) the sticky above about the infamous AFR tuner program, and it's uses. Bottom line is that the actual #s in the AFR grid dont really matter, just change the #s to get the correct AFR as recorded from WB.
But there are ways to adjust other things to get the commanded closer to the actual. How important is this? I am running a 165 MAF ecm, so I imagine I have to hit the MAF tables and scalers at the higher load/airflow areas. | | |
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Best ET 14.413 @95.57 w/2.77 stock rear(10/01/2000)
NEW! Best ET 14.0474 @95.31 with 3.73gears(06/05/2011) and 1.8823 60'
Still stock valve covers & stock block, cam, heads.
Vigilante TC, tranny rebuilt, Spohn torque arm. Finally into sub-2.00 sec 60' zone!
Many other basic mods. Continuous PROM tuning. Got traction, need reaction! |
 
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