Run Open Loop with WideBand and use Lamda with a new spreadsheet?
Run Open Loop with WideBand and use Lamda with a new spreadsheet?
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
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I'm thinking closed loop is OK, with a WBO2 tuned VE Table. The PCM will still use the VE Table, and adjust INT with the NBO2. The idea is to keep the BLM update from changing / re-learning the VE Table. The WBO2 data is more accurate, so calibrating the VE table with WBO2 data is more accurate than BLM update.
The challenge is being able to get enough WBO2 data, and how to sort and average the WBO2 data.
dave w
Also kill power to PCM to clear the BLM learn already done.
Disable should be easy "Minimum Temperature for BLM Update Enable"
BLM learn doesn't change VE tables, there is a BLM learn table which stores BLM. If you look at boundries you can see how the low end needs to be changed for a cammed engine or idle and off idle/low RPM end up in same cells. Ever notice BLM cell number in data logs?
Lambda is way easier then AFR. Lambda = 1.00. Rich is less then 1.00 and lean is more then 1.00 So if Lambda reading is .82 then VE cell X .82 = new VE.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Last edited by PJG1173; 11-12-2012 at 07:26 PM.
87 4Runner, 15" spring lift, 3" body, chevy vortec 355, 5.29 gears, 38.5x15.5x15" Boggers, 280hr, 16168625 running $0D
93 S10, 36x12.5x15 TSL's, custom turbo headers, 266HR cam, p&p vortec heads, $0D Marine MPFI with 8psi boost.
05 Silverado, 2' lift, 4" exhaust, Bully Dog programmer,
There are some filter differences in the Excel Marco vs. Access filters. The Excel Marco filters open throttle / closed throttle by 3 MPH / 2.7 % TPS. The Access spreadsheet is using the idle timing flag for near idle data. Closed loop data only in the Excel Macro (regradless of temperature set point), so the temperature setting is a possible difference in filtering in Access. The Excel Marco does not filter DFCO, but the Access spreadsheet does. Both Excel Marco and the Access spreadsheets filter AE / PE. Overall, I think either spreadsheet will filter / sort the data logs for a good tune.
I noticed an unexplained difference in the VE Table changes Access vs. Excel?
dave w
Last edited by dave w; 11-13-2012 at 06:15 AM.
I've done another summary comparision between my excel macro vs the access spreadsheet. The results are very similar except for a few cells. I can't step into access like I can excel to see the data processing.
dave w
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