T6.1 Speedo Adjustment for larger wheels

[Alexander4699]

Much appreciated

 

[Silas (son of Silas)]

As mentioned earlier in this thread, the 235/65/17 actually corrects the oem speedo error on the T6 (and I assume T6.1) so that it matches GPS exactly.
It may not be necessary to do anything on the T5.1 either and that size is chunky looking enough to suit many of the AT tyres available.
View attachment 214902

Yup. This exactly. Check it before you 'correct' it.

 

[ascotvan]

With the success of calibrating the speedo for larger wheels on my own T6.1 Transporter, I tried to calibrate the speedo of another T6.1 Transporter.
As is mine, it is a 2023 T6.1. However, it has digital dash instruments and TPMS, where mine has analog dash instruments and no TPMS.

On this T6.1 with digital dash instruments and TPMS, changing wheel circumference variant (17: Instruments, Coding, Byte 3, bit 0-2) has no effect on
17: Instruments, Advanced Measuring Values, IDE00845-MAS03213 Wheel circumference-Average circumference for trip distance, and
IDE00845-MAS03214 Wheel circumference-Maximum circumference for speed.
It is like wheel circumference variant is not connected on this T6.1. It can be set to larger or small without error or effect.

Does anyone know if wheel circumferance2 variant (17: Instruments, Coding, Byte19, bit 0-4) should instead be used on a T6.1 with digital dash instruments?
Is that what wheel circumferance2 variant is for?

VCDS doesn't have a helper for 17: Instruments, Coding, Byte19, so I would like find additional information before experimenting with changes to wheel circumferance2 variant.
Thank you for any and all help.

 

[mmi]

Please share

(1) VCDS Auto-Scans,​

(2) 17-Instruments adaptation maps,​

(3) 17-Instruments blockmaps​

of both vans.

 

[Pauly]

This is an interesting time for this to pop up as i still need to adjust mine and have already retrofitted a digi dash !

 

[EAN]

Just to add to the collective T6.1 Speedo data, after mine was changed from Wheel circumference variant 1 to Wheel circumference variant 3 it makes the Speedo bang on for 235/55/18’s against GPS.

 

[kevcook76]

@Loz - Sorry to re-ignite this topic again but I am still struggling to find a definitive answer. I have a T6.1 2020 which has been converted to a camper, when I brought it from new from the converter it came with 18" 255/45 R18's (WolfRace Aero) that always reported about 2/3 under so 30 on speedo 28 on GPS etc. I have recently changed to a set of Fox ADV's 17" with General Grabber AT3 245/65 r17's and now I am seeing the opposite 30 on the speedo and 32/33 GPS and I can see a bigger difference at higher speeds speedo 60 gps 63/64. Can this be corrected successfully on a T6.1? What needs to be changed? Is it still a one way trip
Thanks so much in advance