[DealBMW]

There is this guy from Brooklyn doing 190mph in his m340i

[OmahaDB]

Originally Posted by AP

The speedo will always indicate slightly higher by law. It's to avoid you getting a ticket for exceeding the speed limit when the Speedo states you were not.

I believe here in the U.K. the police traffic cars have a calibrated speedometer that reads the true speed.

Presumably tyre wear may also affect the reading albeit by a tiny amount.

Possibly where you are, but not here. I always check mine against GPS and mile markers -- it's spot on. So was the Mercedes, the pickup is a tad slower than the speedo due to different tires, even wife's Toyota is accurate. That one surprised me, as most Toyotas seem to be doing 5-10 under, I'd have thought it was a brand related speedo inaccuracy.

[Dheeth-G80]

About 180ish following a gt3 doing 193

[carbahn_m550i]

162 MPH, 20 in wheels, Pirelli P Zero run flat, dry road, nice weather, very stable driving. I was having some fun with 2 Scatpacks. Tons of adrenaline from that speed. I would say it will go even better if not a speed limiter because revs were at 3.5

[540iSUP]

Originally Posted by AP

The speedo will always indicate slightly higher by law. It's to avoid you getting a ticket for exceeding the speed limit when the Speedo states you were not.

I believe here in the U.K. the police traffic cars have a calibrated speedometer that reads the true speed.

Presumably tyre wear may also affect the reading albeit by a tiny amount.

My car read 3 mph faster than what GPS was showing. I coded the speedo to show actual speed. Now its spot on.

[ezaircon4jc]

Originally Posted by 540iSUP

My car read 3 mph faster than what GPS was showing. I coded the speedo to show actual speed. Now its spot on.

How? I've tried coding speed correction in both my F10 & G30 to no avail.