[bulletrs]

I managed to get a used pre lci M2 tacho. I installed it into my M235, everything is working except the km/h reading. The M2 tacho reads approx 10km/h lower than actual speed.

Is there some coding or calibration I forgot?

[XutvJet]

The M2 runs 1" taller tires.

[bulletrs]

Any idea how to code the difference out? If possible that is..

[bulletrs]

Originally Posted by XutvJet

The M2 runs 1" taller tires.

It's not the tire size that causes the issue. M2 has 265/35/19 on the rear, my M235 has 255/35/18 on the rear. When driving 50km the difference should only be around 2,5km, on mine it is +10. There should be some coding or something possible.

[aerobod]

Originally Posted by bulletrs

It's not the tire size that causes the issue. M2 has 265/35/19 on the rear, my M235 has 255/35/18 on the rear. When driving 50km the difference should only be around 2,5km, on mine it is +10. There should be some coding or something possible.

I would look at the pulse rings on the hubs. The M2 and M235i use different hubs, so the number of teeth on the pulse generator ring may be different.