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Originally Posted by terrymcg
My car is a 2003 E46 M3. I thought the speed pulse is available at the back of the BM54?
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That's the averaged TAA speedo pulse
If you want super accurate dead reckoning, you want the wheel speed pulse from one of the wheels, available at the ABS unit. These are instantaeneous and non-averaged, have quicker reaction to true vehicle speed.
Look at
the WDS to see where the wheel speed pulses for the factory-fitted nav come from.