Add more info on FT86 CAN messages
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# FT86 cars (Subaru BRZ, Toyota 86, Scion FR-S)
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Here is information on some of the PIDs that you're most likely to use with
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RaceChrono and equations to get the right scale, etc.
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## PID 0xD0
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Update frequency: 50 times per second.
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@ -11,3 +14,58 @@ Z rate of rotation | bytesToIntLe(raw, 2, 2) * -0.318309886
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??? | bytes 4, 5
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Lateral acceleration | bytesToIntLe(raw, 6, 1) * 0.2
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Longitudinal acceleration | bytesToIntLe(raw, 7, 1) * -0.1
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Combined acceleration | sqrt(pow2(bytesToIntLe(raw, 6, 1) * 0.2) + pow2(bytesToIntLe(raw, 7, 1) * 0.1))
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## PID 0xD1
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Update frequency: 50 times per second.
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Channel | RaceChrono equation | Notes
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------- | ------------------- | -----
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Speed | bytesToIntLe(raw, 0, 2) * 0.01569358787 | May want to check the multiplier against an external GPS device
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Brake position | min(C / 0.7, 100) | The third byte is the pressure in the brake system, in Bars. The 0.7 divider seems to be a good value to get 100% at pressure slightly higher than those you're likely to use on the track for cars with no aero. You can use 0.8 or 0.9 if you see 100% too often.
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# PID 0xD4
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Update frequency: 50 times per second.
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Channel | RaceChrono equation | Notes
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------- | ------------------- | -----
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Wheel speed FL | bytesToIntLe(raw, 0, 2) * 0.01569358787 | Use same multiplier as for speed in 0xD1
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Wheel speed FR | bytesToIntLe(raw, 2, 2) * 0.01569358787 | Use same multiplier as for speed in 0xD1
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Wheel speed RL | bytesToIntLe(raw, 4, 2) * 0.01569358787 | Use same multiplier as for speed in 0xD1
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Wheel speed RR | bytesToIntLe(raw, 6, 2) * 0.01569358787 | Use same multiplier as for speed in 0xD1
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# PID 0x140
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Update frequency: 100 times per second.
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Channel | RaceChrono equation | Notes
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------- | -------------------
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Accelerator position | A / 2.55
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Clutch position | (B & 0x80) / 1.28 | On/off only
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Engine RPM | C + (D & 63) * 256
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??? | E
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Throttle position | F / 2.55 | Not tested
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??? | G
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??? | H
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# PID 0x141
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Update frequency: 100 times per second.
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Channel | RaceChrono equation | Notes
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------- | -------------------
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Gear | G & 0xF | Not tested much. The value seems to jump so much that the usefulness is questionable.
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Given how frequently 0x141 messages are sent, I presume there's a lot more
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interesting info there.
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# PID 0x360
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Update frequency: 20 times per second.
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Channel | RaceChrono equation
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------- | -------------------
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Engine oil temperature | C - 40
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Coolant temperature | D - 40
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