Quote:
Originally Posted by ChuMpion3
I suspect that those that saw numbers beyond the limit benefitted from BMW speedos overstating speeds.
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Quote:
Originally Posted by tdizzle
This was my thinking. The speedo's read high on purpose from the factory. I forget the detail but it was something like +2mph and a small % factor for errors. Basically, they dont want the speed0 to show you are going slower than you actually are.
But this is probably already known. I thought they were limited to 155 electronically (the HUD would probably show something above 160 though).
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The speedo is optimistic, but not by such a wide margin.
There is a magazine that GPS measured the M4 top speed at 163mph with a speedo indicated 167mph. Car and Driver also GPS measured the M3 and M4 top speed at 163mph.