Here is the common CAN BUS codes used for telemetry in a typical racing application.
TODO: Found a way to get the brake pressure instead of an on/off signal.
The CAN PID codes provided here are for experimental purpose only. Use them at your own risks.
I am not associated with or sponsored by any of the companies listed here. I simply use their products for my personal use.
The following codes have been successfully tested with the following equipement and software:
- OBDLink MX+ Bluetooth scanner
- Huawei P30 Pro mobile Phone with Android 10
- Mazda RX-8 2006 (serie 1), manual transmission and DSC equiped
- RaceChrono v7.5.3
As of version 7.5.3, it's required to enable experimental features in RaceChrono to make it works. Follow this link for more information.
- Multibytes values are big endian
- In RaceChrono, Bits position are counted from MSB and range from 0 to 63. I.g.: Bits 57 has a value of 64.
- PID:
0x201 - Bytes offset:
6 - Bytes length:
1 - Bits mask:
None - Value type:
UINT8 - Formula:
Accelerator position percent = Value / 2 - RaceChrono item:
Accelerator position (%) - RaceChrono formula:
BytesToUInt(raw, 6, 1) / 2 - Note: The raw value has a range from
0to200
- PID:
0x212 - Bytes offset:
5 - Bytes length:
1 - Bits mask:
0x08 - Value type:
Bool - Formula:
Brake depressed = Value - RaceChrono item:
Brake position (%) - RaceChrono formula:
BitsToUInt(raw, 44, 1) * 100
- PID:
0x212 - Bytes offset:
4 - Bytes length:
1 - Bits mask:
0x40 - Value type:
Bool - Formula:
Hand brake engaged = Value - RaceChrono item:
Brake position (%) + postfix 2 - RaceChrono formula:
BitsToUInt(raw, 33, 1) * 100
- PID:
0x231 - Bytes offset:
0 - Bytes length:
1 - Bits mask:
0x80 - Value type:
Bool - Formula:
In neutral position = ~Value - RaceChrono item:
Clutch position (%) - RaceChrono formula:
(1 – BitsToUInt(raw, 0, 1)) * 100 - Note:
0when in neutral or clutch depressed, otherwise1
- PID:
0x420 - Bytes offset:
0 - Bytes length:
1 - Bits mask:
None - Value type:
UINT8 - Formula:
Temp (°C) = Value – 40 - RaceChrono item:
Coolant temperature (°F) - RaceChrono formula:
BytesToUint(raw, 0, 1) – 40 - Note: RaceChrono converts the value to Fahrenheit automatically.
- PID:
0x201 - Bytes offset:
0 - Bytes length:
2 - Bits mask:
None - Value type:
UINT16 - Formula:
RPM = Value / 4.0 - RaceChrono item:
Engine RPM (rpm) - RaceChrono formula:
BytesToUint(raw, 0, 2) / 3.85 - Note: Divide by 4 is the standard formula, however 3.85 seems to match the value displayed by the car’s instrument cluster. Don't know wich value is the good one, needs investigation.
- PID:
0x250 - Bytes offset:
3 - Bytes length:
1 - Bits mask:
None - Value type:
UINT8 - Formula:
Temp (°C) = Value – 40 - RaceChrono item:
Intake temperature (°F) - RaceChrono formula:
BytesToUInt(raw, 3, 1) – 40 - Note: RaceChrono convert it to Fahrenheit automatically.
- PID:
0x201 - Bytes offset:
4 - Bytes length:
2 - Bits mask:
None - Value type:
UINT16 - Formula:
Speed (KM/h) = (Value – 10000) / 100.0 - RaceChrono item:
Speed (KM/h) - RaceChrono formula:
(BytesToUInt(raw, 4, 2) – 10000) / 360 - Note: RaceChrono needs the value in M/s, instead of dividing by 100 we have to divide by 360 to achieve that.
- PID:
0x81 - Bytes offset:
2 - Bytes length:
2 - Bits mask:
None - Value type:
INT16 - Formula:
Stering Angle (°) = Value - RaceChrono item:
Steering angle(°) - RaceChrono formula:
BytesToInt(raw, 2, 2) * -1 - Note: RaceChrono needs the input to be inversed form the original value to display the streeing angle animation correctly. So we multiply the value by '-1' to invert the angle.