I have the VSS wire hooked up on my car (correctly according to resources found on this site), but I think the speed that the D3 reports is incorrect. I have different size wheels on my car than stock, but according to all the tire size calculators I can find online, there should be a 2% difference in actual speed. So when I'm going 60mph, the speedometer should say ~61-62mph, but when the speedometer says 61-62mph, the AVIC says that I'm going about 55mph. I don't know what my real speed is anymore =[. Is there any way to calibrate the speed on the AVIC (I don't know how that would work...)?

Thanks,

Jeff

did you install the avic before or after the tire change?

How much of a size change did you go? I know on mine, I went to 36's, I already knew that my speedo showed "about" 5MPH faster than I was going, sure enough, when I installed the D2, 5.2MPH faster than the what my actual speed is.

The AVIC went in after the tire change. Here are the sizes:

Old: 205/65/15

New: 225/45/17

According to those online tire calculators (like http://www.1010tires.com/TireSizeCalcul ... &reset=yes), the over rim+tire diameter isn't much different. If I remember correctly I even did a reset on the AVIC after I hooked up the VSS wire.

It possible the vehicle's speedometer is inacurrate as well. I know mine says I'm going 60 when my actual speed is 55. THat's bone stock.

hmm..i considered that...but i guess i was hoping my car wasn't messed up..hah