How the performance gauges work
An often asked question on the BMW forums is how the performance gauges are calibrated.
The gauges work by splitting the power dial into 8 sections and then exposing parameters which define the power per section of the guage.
The allocation of cells according to units is as follows:
Note, that the tunerpro setup defines these as arrays, but BMW's A2L defines them as individual values K_EDA_P_ANZ_SPORT_BS_SCAL_CODE0, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE1, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE2, K_EDA_P_ANZ_SPORT_BS_SCAL_CODE3 and values are in reverse order. Thus the correspondence with units is
- CODE0 --> kW
- CODE1 --> kW
- CODE2 --> PS (i.e. metric HP)
- CODE3 --> other
The other slot tells the DME's what to do in case is receives a nonsense unit so can be left stock.
The situation is similar with torque, where we have the following codes:
- K_EDA_MD_ANZ_BS_SCAL_CODE0 --> Nm
- K_EDA_MD_ANZ_BS_SCAL_CODE1 --> Nm
- K_EDA_MD_ANZ_BS_SCAL_CODE2 --> ft.lbs
- K_EDA_MD_ANZ_BS_SCAL_CODE3 --> kg.m
- K_EDA_MD_ANZ_BS_SCAL_CODE4 --> other
