[xMoses]

4622

Ok, so the middle point on M3 gauge is between 120 and 150 - 135 km/h, so from 135 to 330 the needle goes a half of the dial - (4622 / 2) = 2311 steps for (330 - 135) = 195 km/h.

2311 / 195 = 11,85 steps/km for the second half of the dial. Also the same value we have for 120 to 135 km/h range, because there is the same markup step.

Based on this we can get amount of steps for 120-330 km/h and it's 210 * 11,85 = 2489 steps. The remaining 2133 steps are for 0-120 km/h meaning 17,775 steps/km like you you've calculated. So you were close, actually.

Hey mate, the last calculation worked. But now I'm confused. If the speed dial is linear. I just gave to calculate the steps for (km/h / max amount of steps), right?

Effective speed:

0.0 / 13.0 / 52.0 / 120.0 / 300.0

Motor steps:

0 / 200 / 800 / 1484 / 4622 should be right?

Calculated 15.40 steps per kmh. So I can use this value to calculate all 4 points by calculating:
13*14,40 = 200
52*14,50= 800
120*14,50=1484
300*14,50=4622


But if I measure the cluster speed with gps app it's always 4-5 kmh off. The faster I drive, the bigger the difference becomes. Any bad calculation?

EDIT:

With oem coded cluster to 280 the GPS also shows a difference from 5 km/h. I guess it's like a tolerance?

But still too much difference on the calculated cluster.