inaccurate speedometer

[schnellman]

My apologies to those of you have been through this before. But, for the uninitiated, go here to see just what your HVAC controls can do for you.

http://www.cb-racing.com/boxster_AC.html

[Bob O]

Unfortunately, as noted, that HVAC feature only works through MY2000. Seems to be a pretty useful tool. Wonder why Porsche stopped letting us access that info?

Bob

[texomawaves]

Hey guys, the HVAC trick worked on my 98... pretty cool, and thanks. So I set my GPS to kph drove down the road and compared... still a difference, but doesn't seem as much. I forgot to note the difference, but will do it again later today. I will then calculate the error and compare (HVAC vs. speedometer). I will assume my GPS is accurate (of course). Chris

[jmatta]

Everything about this car is nice, but the speedometer is crap!

The speedo has more accuracy than the coolant temp gauge...

I've learned to live with the inaccuracy and just factor the difference into my speed. When I first bought the car, I wondered why everyone on the road was always passing me or riding my a$$.

[texomawaves]

I may get radical and change out my wheels to 18" if that's what it takes The speedo may be designed around 18" wheels. Then anyone with 16" or 17" wheels get the benefit of the Porsche factory "safety-margin" feature (sarcasm) You'd think with 3 different wheel size options there would be and adjustment for all three. Maybe there is???????? I could only hope. However I love my 17" wheels with the cool lookin Pzeros.