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Originally Posted by schnellman
The topic of over optimistic speedometers has been discussed here several times. Some give a constant difference of 3 to 5 mph and others believe it is a 10 per cent difference. Either way, Porsche's answer is that it's a safety margin.
Not sure which model years this applies to, but on early models you can use the diagnostic settings on the HVAC display to accurate speeds in KPH. Yes, you can also find that little tidbit here on the forum. Enjoy!
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I have a 98 and reading in the owners manual where I know can change from mph to kph. It's not on the hvac, but one of the instrument cluster knobs, the right one (I think). Are you saying that it is more accurate in the kph mode or I can adjust it somehow? Sorry, I'm a newbie (10 day Porsche owner actually) :dance: maybe there is some hvac diagnostic to compaer to, but I've only read thru the first 1/3 of the owners manual.