Speedo Correction Is it possible

[Hillbilly]

Did you try the long coding idea for wheel circ?

in module
I have changed the Long coding Module 17 Dashboard/ Wheel circ from 1 to 3 and will take it for a run tomorrow to see if it changes anything


Had look on a Golf Mk 7 forum and that's what they said but didn't give any results

[dgp]

Cool, it will be interesting to see if it does in fact make a difference.
Are you using obdeleven or Ross-tech?

[Hillbilly]

cool, it will be interesting to see if it does in fact make a difference.
Pare you using obdeleven or ross-tech?

obdeleven

[Ozsko]

Measure the tyre roll out against the quoted tyre circumference, I would be interested to see how close it is. For speed correction on race cars we never worried about the circumference only the measured roll out length which will change with speed.

[Hillbilly]

Measure the tyre roll out against the quoted tyre circumference, I would be interested to see how close it is. For speed correction on race cars we never worried about the circumference only the measured roll out length which will change with speed.

Just done it and as far as I can see its 2293 as close as I can get it and done on a cold tyre removed from the car.

Yes I curbed a 6 week old mag *??+**/**

[Ozsko]

It is what on a loaded tyre? unloaded tyres don't have the same shape.

[Sydneykid]

Measure the tyre roll out against the quoted tyre circumference, I would be interested to see how close it is. For speed correction on race cars we never worried about the circumference only the measured roll out length which will change with speed.

These days we correct it to the GPS speed.

Cheers
Gary

[Ozsko]

These days we correct it to the GPS speed.

Cheers
Gary

A bit off topic but what do you mean, you use a physical speed sensor corrected to read the same as GPS?

[Hillbilly]

So have just been for a run down the motorway and here is the result Changed as above from 1 to 3 and at 100kph the OBDII says I am doing 100kph where as on the 1 setting I was doing 104 on the speedo when OBD II said i was doing 100.

My car is an Rline with 20in wheels with 255/40/20 Pirelli tyres

[iDiesel]

Nice work!