wrd1972

iTrader: (12)

First off the MPH on my Scanmaster and my GPS are perfectly in sync, no issue at all there. Its the needle that starts to read a little low at higher speeds, usually over 60MPH.

At 30MPH on the Scanmaster, the needle shows 30 and the same thing at 55. Once you hit 60 and higher, the needle starts to fall a little behind. So at 75MPH on the Scanmaster, the needle reads 72MPH.

Is there a parameter in the tune that can keep the needle more in sync with the MPH reading in the PCM?

jester1614

iTrader: (13)

I believe its a computerized mechanical reading from the VSS (vehicle speed sensor) in the tailshaft of the tranny (if a4 not sure of location on m6)

As far as i know there isnt any way to recalibrate it

AChotrod

iTrader: (17)

Mines way off with the th350 swap reminds me I need to get that tuned!

pancho toco loco

iTrader: (8)

You could try replacing that sensor

jester1614

iTrader: (13)

one thing that might be able to be done, is alter the tire size in the tune to try and calibrate it.

nascarnate326

iTrader: (1)

Odd. Mine is dead on until 90+.

Diff wheels?