An external wideband lambda may be wired to the ECU for datalogging and lean protection.
The Input Source selects what ECU input is connected to the wideband analog output.
| • | o2 sensor is the stock o2 sensor (pin D14) |
| • | ELD is the LED input (pin D10) |
| • | EGRL is the EGRL input (pin D12) |
| • | Analog input 2 (pin B6) |
Note that if the ELD input (D10) is used then R136 and R138 (US ECUs) may need to be removed.
Voltage offset shifts the voltage/lambda conversion by the specified voltage in order to compensate for slight differences in voltage between the ECU and lambda meter.
The voltage/lambda conversion table is specific to each lambda meter. Details can usually be found in the lambda meter instruction manual. Note that the lambda unit (lambda or air/fuel) is specified in the Settings/General window.
Common voltage/lambda conversions:
PLX
Voltage |
Air/Fuel |
0V |
10:1 |
5V |
20:1 |
Innovative
Voltage |
Air/Fuel |
1V |
10:1 |
2V |
20:1 |
Techedge
Voltage |
Air/Fuel |
0V |
9:1 |
5V |
19:1 |
Wideband Lambda Changes For V1.3
In version prior to V1.3.0 the wideband lambda settings were retained as a SManager configuration option, and the datalogged wideband voltage input was converted in SManager either when datalogging or when a datalog was loaded. From V1.3.0 onwards the wideband lambda settings are retained in the ECU calibration, and the datalogged wideband voltage input is converted in the ECU.
These changes have the following consequences:
| • | Wideband lambda settings has been removed from the Settings window. |
| • | Datalogged lambda values cannot be changed by changing the calibration wideband lambda parameters. |
| • | Datalogs make with versions of SManager prior to V1.3.0 need to nominate the wideband conversion used (see below). |
| • | Loading datalogs made with SManager V1.3.0 onwards do not require the |
If a datalog from a previous version of SManager is loaded, the following conversion window is shown:
Once the datalog is re-saved the lambda information will be updated in the datalog, and the conversion does not need to be re-performed.