PDA

View Full Version : recalibrated speedo


Shark
05-10-2006, 12:14 AM
anyone know how to recalibrated speedo in a e46?

thinair
05-13-2006, 04:29 PM
why do you need to recalibrate it? Did you get really huge tires?

What size is stock and what do you have now on the rear wheels?

Shark
05-13-2006, 04:43 PM
I put on a set of 19's, stock is 16's. Also, I notice that odometer counts fast too

Justin e36
05-13-2006, 06:12 PM
shark... I think thinair was asking for the actual size of the tires.. (i.e. 205/55/16)

Shark
05-13-2006, 06:16 PM
225/50/16 to 235/35/19

Justin e36
05-13-2006, 06:25 PM
Your speedometer is not off by a lot. It's only 2.5% slow.
So when you're on the highway and your speedo says 100km/h, you are actually travelling at 102.5km/h.

This also means that your odometer will be counting SLOW, not fast. Since you're actually travelling a tad faster than your speed sensor thinks you are travelling. (remember, the smaller the overall circumference of the wheel, the faster it will rotate, the larger it is the slower it rotates).

Although you put a larger rim on, the profile (sidewall) of your new tires is a lot lower. The overall diameter is almost the same. Your stock wheels had a diameter of 24.9" while your new wheels are 25.5"

The dealership can recalibrate the control module. Or you can purchase the equipment to do it yourself from dashboardprogramming.com

J