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      05-07-2013, 11:18 PM   #32
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swamp2's Avatar

Drives: E92 M3
Join Date: Sep 2006
Location: San Diego, CA USA

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Originally Posted by mhabs View Post
Nice and love the pic! Thought I remember seeing a video of an M3 at 300 kph indicated speed but per the GPS unit was really around 280, so around 7% in that situation. Would also be nice to see the digital speedo as well. thx for sharing
Good information. I was under the impression that speedo error was just a fixed percentage. I have personally verified 3-4$ at speeds below 100 mph in my car, GPS vs. indicated. However, someone else also posted that they thought the percentage rose at higher speeds. I would love to see that information if you can find it.

There is certainly no reason BMW couldn't program the speeds to do anything they want. My idea that the correction is a fixed % is, I guess, a bit outdated and sort of an "analog"/"mechanical" way of thinking.
E92 M3 | Space Gray on Fox Red | M-DCT | CF Roof | RAC RG63 Wheels | Brembo 380mm BBK |
| Vorsteiner Ti Exhaust | Matte Black Grilles/Side Gills/Rear Emblem/Mirrors |
| Alekshop Back up Camera | GP Thunders | BMW Aluminum Pedals | Elite Angels |
| XPEL Full Front Wrap | Hardwired V1 | Interior Xenon Light Kit |