TimboIS

Speed and ODO are taken off the front, but not for that reason. You're likely to get more variation due to spinning, etc from the rear wheel.

tqlla3k

iTrader: (1)

So if you run on the dyno the speedometer doesnt move?

My 3000 gets its speed of the drive wheels, so I thought it would be the same on all cars. Can anyone who has been on a dyno verify this? I figured the speed sensor was in the transmission somewhere

4TehNguyen

iTrader: (1)

im sure it will read a speed when you dyno. The speedometer sensors utilize the rpm of the wheel of the car, thats why when people get different wheels they have to get the tire/wheel combo to match as closely to the oem overall diameter as possible so the speedo wont be thrown off.

NINEZeRO

I think there are 18" all season tires that will fit. This will make the ride much more smoother. But you're in cali, I would personally just stay with the dunlops.

TimboIS

Not on any cars I've had. Do a standing burnout and see the speedo.

tqlla3k

iTrader: (1)

If a speed registers on the Dyno, then the speed is not calculated off the front wheels.

Timbo, if the speed is not calculated off the drive wheels, How would a shop be able to test your speedometer accuracy?