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Old 14th September 2012, 10:19 PM
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It takes a little while to calibrate the GALA etc.

Strictly speaking, the speed pulse signal off a factory fit unit comes direct from the ABS unit, and the pulses are far more frequent, and thus more accurate. The pulses from gala are less frequent, but will do the job ok.

If you take an RNS-D from a factory fit car running ABS pulses to a retrofit running GALA pulses it will take maybe 10/15 mins of driving before they come into alignment. Until then, the GPS will keep correcting it, but the arrow will race off at the wrong speed. This is quite normal.

They always constantly calibrate in the background to allow for tyre wear etc, so if you change wheels for example and have a slightly different circumference, it will sort itself out quite quickly with no intervention.

Note as well that a factory fit unit should have a connection to the reversing signal so it knows when the pulses are going backwards. It keeps things more accurate if you're 3 point turning in a multistorey car park for example and want it to have some clue where you are when you hit the main road. Without it, the GPS will correct it when it gets a fix again.

Incidently, the RNS-D can calibrate to the much slower speed of the GALA pulse (as can the VW/Seat/Skoa MFD)- The RNS-C cannot. Retrofitting an RNS-C requires the speed pulse hardwiring from the ABS controller in the Plenum chamber in the engine bay.

And yes. I learned that the really hard way
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