Been on run today and set up GPS App, Hidden Menu and Digital Speed on Dials.

Speedo showing 50 mph, Digital read out 80kph, app 80kph, Hidden Menu 80kph GPS / Most 85 kph.

It appears everything spot on, apart from whatever uses Most ECU’s.

What values did you change? 2012 TDV8 Vogue (L322)

Just the wheel size and width, will check in morning what circumference it is set at, as you stated earlier the overall wheel size is the same as yours.

Will take some screen prints and post

Set the digital speed display to on and added 12mm to the rolling radius - ABS value. GPS app on phone, digital speed readout and the dial all read the same speed i.e the same as before so this value is not running the speedo. I wonder if dealers have the facility to reprogram the car for different wheel sizes through the official workshop software? 2012 TDV8 Vogue (L322)

Set the MSP-IPC to 32 but the speedo now slightly under reads the GPS true speed and I found a post on a US forum that corroborated this and they recommended setting the number lower so will try 30 tomorrow. 2012 TDV8 Vogue (L322)

Fixed! MSP-IPC set from stock 31 to 30 results in a 1-2 mph speedo over read of the actual (GPS on phone) speed. I could set it to 29 and get the 'normal' 3mph over read but I think that's a bit much. Probably still worth setting the rolling radius-ABS to the correct number as well as this may help other systems. 2012 TDV8 Vogue (L322)

Took a long trip with it set at 29. Just about perfect IMO. Indicated 70mp is 67/68 on the GPS @ <1400rpm. Cruise sets accurately. Not so sure about DTE and other trip functions but these are not important. 2012 TDV8 Vogue (L322)

Sorry to jump in to this post, but can someone tell me how to get this wheel size menu on my Gap? I cant say ive seen it... unless its because my old 04 TD6 doesnt have the feature?


cheers

steve

Car configuration - instrument pack. 2012 TDV8 Vogue (L322)