Treurentner
December 5th, 2005, 12:24 AM
Hi,
I putted a powerdyne with fmu on my GMC Jimmy with L35 Vortec engine.
Now my techedge (1.0) wideband shows different AFR´s in different gears at same rpm´s - generally the higer the gear the richer the mixture.
What causes this?
Its independend from VE or maf tuning,
1. Gear 12,5:1,
2. Gear 12:1,
3. Gear 11,5:1
4. Gear 11:1,
in every case the car is in open loop and PE is active. The commanded AFR and the reall live are nort far off. But what causes an commanded AFR fom 11.1 :1 wenn I floor the throttle and when I lift off only a little (still in PE and OL) it´s going back to 12.5?
I append an example with basic stock tuning. You will see that in the same moment the mV fom stock O2 sensors went slightly down (leaner), the afr from Wideband shows going richer. I ensure that CL is working perfect, and wideband shows exactly 14.7!
How can I interpret this - wich data I can belive?
Every recommendation is welcome!
Marco
(the Te wideband 1.0 is non linear and so this is the transfer table:
Vout Lambda Petrol
1.40 0.686 10.08
1.45 0.696 10.23
1.50 0.706 10.38
1.55 0.716 10.53
1.60 0.727 10.69
1.65 0.739 10.86
1.70 0.750 11.03
1.75 0.762 11.20
1.80 0.774 11.38
1.85 0.787 11.57
1.90 0.800 11.76
1.95 0.814 11.96
2.00 0.828 12.17
2.05 0.842 12.38
2.10 0.857 12.60
2.15 0.873 12.83
2.20 0.889 13.07
2.25 0.905 13.31
2.30 0.923 13.57
2.35 0.941 13.84
2.40 0.960 14.11
2.45 0.980 14.40
2.50 1.000 14.70
I putted a powerdyne with fmu on my GMC Jimmy with L35 Vortec engine.
Now my techedge (1.0) wideband shows different AFR´s in different gears at same rpm´s - generally the higer the gear the richer the mixture.
What causes this?
Its independend from VE or maf tuning,
1. Gear 12,5:1,
2. Gear 12:1,
3. Gear 11,5:1
4. Gear 11:1,
in every case the car is in open loop and PE is active. The commanded AFR and the reall live are nort far off. But what causes an commanded AFR fom 11.1 :1 wenn I floor the throttle and when I lift off only a little (still in PE and OL) it´s going back to 12.5?
I append an example with basic stock tuning. You will see that in the same moment the mV fom stock O2 sensors went slightly down (leaner), the afr from Wideband shows going richer. I ensure that CL is working perfect, and wideband shows exactly 14.7!
How can I interpret this - wich data I can belive?
Every recommendation is welcome!
Marco
(the Te wideband 1.0 is non linear and so this is the transfer table:
Vout Lambda Petrol
1.40 0.686 10.08
1.45 0.696 10.23
1.50 0.706 10.38
1.55 0.716 10.53
1.60 0.727 10.69
1.65 0.739 10.86
1.70 0.750 11.03
1.75 0.762 11.20
1.80 0.774 11.38
1.85 0.787 11.57
1.90 0.800 11.76
1.95 0.814 11.96
2.00 0.828 12.17
2.05 0.842 12.38
2.10 0.857 12.60
2.15 0.873 12.83
2.20 0.889 13.07
2.25 0.905 13.31
2.30 0.923 13.57
2.35 0.941 13.84
2.40 0.960 14.11
2.45 0.980 14.40
2.50 1.000 14.70