Speed

[legendryan]

Quick question, how does the car work out its speed that your travelling at?

Cheers

 

[Ian]

Depends on the year of your car. Early ones have a mechanical speedo drive into the clocks, later ones use an electrical speedo drive which I believe also goes into the clocks.

 

[legendryan]

Okay, I currently have 13'' wheels. if I was to put 15'' wheels on there would I need to calibrate or re-programme anything. I have a facelift K11.

 

[pollyp]

Not really needed, just compare the readings with satnav to stop urself from speeding. When i was on 13" with 185/70 tyres the speedo was 3-4mph higher than gps. Now i'm on 15" with 195/50 the readings are spot on

 

[Dave_Ally]

Yeah the speedo is a couple of mph out on mine compared to the OBD2 reading, mainly over 60 really. Smaller to bigger tyres should in theory bring it in line as pollyp says.

 

[legendryan]

Wicked guys, will check it with the TomTom when the 15's are on