Quote:
Originally Posted by Tribute Automotive
Something must have been lost in translation at the show Dave, the only modification to the Z3 base car, apart from stripping off the outer panels of course, is to cut off two small brackets from the front grille area. I will post up some pictures when I have them.
An interesting point with the taller profile tyres that are fitted to my SWB is that it corrects the over reading on the Z3 speedo, according to my GPS, almost exactly.
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Oops, didn't mean to muddy the waters there and I stand corrected.
As for the speedo error, from experience of checking uncalibrated speedos on a lot of cars against laser speed guns (100% accurate), almost all read around 10% higher than actual speed, so 70mph is actually 63 and 100 is 90. A 10% increase in rolling diameter on the tyres will take out this error and that's exactly what happened with mine. Just bear in mind that if your speedo under reads significantly you'll probably pick up points from average speed and Gatso cameras.
This tool is useful to work out what tyres will fit and how they'll affect the speedo -
http://www.kouki.co.uk/utilities/vis...ize-calculator