VersaTune User Forum

just changed my tires to a differant size than OEM and was wondering if this option was going to be added any time soon

Would be most useful, especially with smaller winter tires speedo reads way too high and is not accurate with summer tires either. Now I have to follow Dashhawk reading which can be calibrated.

guys any update on the request?

We have been investigating this request, but it appears to be quite complicated. The actual speed calculation involves a number of different electronic control modules, we are trying to figure out the relationship between them. Since there were no wheel/tire options for MS6/MS3/CX7, there is a possibility that speedo calibration is actually hardcoded and cannot be changed by a simple reflash.
Do you know of any tuning solutions for the DISI that would allow calibrating the speedo?

Personally I'm not aware of any such option. Maybe the service tools/software the mazda dealers have can change this, but when I requested this to my dealer (which is a pretty competent one) they just said they'll look into it and never did it.
Also, Hypertech has a speedo calibration tool but it's not available for the 2.3DISI or RX8, I guess there's a reason for that.

There is no option in the Mazda MMP tool to calibrate the speedo for Gen1 DISI vehicles. It exists for other platforms though.