HP tire size speedo adjustment with forscan

[Johnny Rockit]

And so is reading. I already said the tire size. And I said the value (2108) that calculator gives is incorrect. Try to keep up.

Lighten up Frances. Try changing the circ. valye a bit until it is "right". As has been mentiones earlier, the Fords all seem to be off a little. My car reads slower that the gps units I use. My F-250 reads the closest at +3mph at highway speeds.

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[ZXMustang]

Circumference in mm is the value you need to find out. You can change this in the tune as well with HPT. I have yet to change mine for my DRs I run full time, but below you can see what my 20" were stock and what the new DRs are by the calculator I found online. I would have to up the max circumference then put the driven in correctly to put it within that range.

 

[K4fxd]

You have to change the learn from box to calibrate.

 

[1SLwLS1]

I followed this thread when I wanted to precisely calibrate my speedometer to my unique rear tires.

 

[AZ_Ryan]

I followed this thread when I wanted to precisely calibrate my speedometer to my unique rear tires.

Thank you!

 

[gsxr1300]

Can you do this with forscan lite with a phone?

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