Damm fine T6 rims

[transparu]

Any advice on just HOW to correct the speedo in a T5.1?

I think I'm correct in saying that in many?all VWs there is a Distance Impulse Number that the computer uses to calculate road speed from tyre diameter but I am pretty sure I can't find anyone who has talked about having actuaslly chenged it in a T5.1 (or T5). This does require access to the digital innards (Instrument Control Module) but my local VW Service Manager (who has always been very good) says he's never heard of the Distance Impulse Number. In other vehicles Europeans and US VW owners use the un-cheap Ross-Tech VCDS system.

It would be good to heard comments from anyone who knows if it is possible.

I don' think anyone on the forum has yet said they have successfully persuaded authorities to accept a GPS-provided speed as the "speedometer" for their vehicle.

(I think the Distance Impulse Number is in effect an index of the actual vehicle model. (So the three wheel size/tyre size combinations in a T5.1, for example, all give a rolling circumference within a couple of mm.) VW electronics/firmware common to many vehicles distinguishes between at least some models on the basis of Wheel Size (i.e. Distance Impulse Number). Apparently in sedans, at least, you can change tyre circumference and effectively tell the computer you are driving a Golf (for example) and not the actual ?Skoda? the vehicle is, and thus correct a speedo reading.

See Speedometer fast error adjustment and correction - mk5, mk6 | VW TDI forum, Audi, Porsche, and Chevy Cruze diesel forum)

FWIW folks.

Don't forget to correct your speedo!!!

[lemmiwinks]

On my T6 4motion I have a "winter tyres" option within the MFD. Corrects the speedo +10km/hr or -10km/hr. Perfect for running bigger circumference wheels / tyres.

[Bryn23]

On my T6 4motion I have a "winter tyres" option within the MFD. Corrects the speedo +10km/hr or -10km/hr. Perfect for running bigger circumference wheels / tyres.

I saw this "winter tire option" in my MFD, when i first got, but didn't think anything of it.

i'll have to have a look into this.

Cheers

[transparu]

Re WINTER TYRES
Bad news . . this setting relates to the speed at which an audible warning is given that the vehicle is approaching the rated speed of the tyres. This is apparently lower for Winter Tyres.


From another Forum
Quote from the manual....
Winter tyres
Here you can set at which speed a warning signal should sound. This function is used
for e.g winter tyres with the permissible maximum speed less than the maximum
speed of the vehicle.
When exceeding the speed, the following is displayed on the information display*:
Snow tyres max. speed ... km/h (Winter tyres maximum ... km/h)

[transparu]

Seikel, amongst their information online, offer a Speedometer adjustment service when changed tyres/wheels are added to their lift kit. The change for Earlier T5's is pretty expensive but E35.70 for post 2011 vehicles suggests it is a simple change.
FWIW


Speedo adjustment
for Volkswagen T5 up to MY 2010
446,25 € (incl. tax)
375,00 € (ex. tax)
for Volkswagen T5 from MY 2011
35,70 € (incl. tax)
30,00 € (ex. tax)

See under the T5 tab at:
Tyre change - Seikel