Speedometer reading is not accurate

soxfan · Post by **soxfan** » Tue Nov 24, 2009 8:24 pm

I noticed while looking at some of my datalogs today that with a MAP tune, the speedo indicates 3mph higher than what the datalog shows. For instance, I had the cruise control set at 80mph, but the speed indicated on the datalog is 77 mph. This doesn't happen with the stock calibration. Why is that?

maiku · Post by **maiku** » Wed Nov 25, 2009 2:04 am

Double check your speed compensation didn't get messed with in your calibration. That function is there for people who run different size rims/tires.

VitViper · Post by **VitViper** » Wed Nov 25, 2009 8:51 am

soxfan wrote:I noticed while looking at some of my datalogs today that with a MAP tune, the speedo indicates 3mph higher than what the datalog shows. For instance, I had the cruise control set at 80mph, but the speed indicated on the datalog is 77 mph. This doesn't happen with the stock calibration. Why is that?

I can confirm this is happening.

maiku wrote:Double check your speed compensation didn't get messed with in your calibration. That function is there for people who run different size rims/tires.

Speed compensation has not been touched.

soxfan · Post by **soxfan** » Wed Nov 25, 2009 9:31 am

nope, never touched the speed compensation