Hi All,
I had 2 GPS readers active in my car, and both seemed to confirm the speedometer is 2-4 MPH too high. Only thing I'm thinking is that I'm not running original wheels (put on by a previous owner). Note, I've only had the car for a month.
Anyone have any ideas? Is this something I could/should recallibrate? Thanks!
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All Speedo read slightly high, from factory
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Hi, it’s normal but you can bring it closer by fitting higher profile tyres or using Carly or similar to code the speedo to display the correct speed.B121 wrote: ↑Wed Sep 12, 2018 6:28 am Hi All,
I had 2 GPS readers active in my car, and both seemed to confirm the speedometer is 2-4 MPH too high. Only thing I'm thinking is that I'm not running original wheels (put on by a previous owner). Note, I've only had the car for a month.
Anyone have any ideas? Is this something I could/should recallibrate? Thanks!
You will lose your safety buffer when it comes to speeding offences though!
Rob
e89 Sdrive 20i, plenty of mumbo & good economy-the thinking bears z4
e89 Sdrive 30i, this ones busted, pass me another...
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The official specs for a factory speedo are +10% -0% so they always err on the side of reading high (as much as 77mph at a true 70mph). Most over-read by around 2-3%.
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Come to think of it, though ...
I use the cruise control in my 18"-wheel E89 on average speed camera roads. Limit 50 - set at 50. My GPS-based speed camera locator screams at the same points + 1 mph.
(The the cruise control indicator can be fixed exactly on the speedometer and is easier to read than a wandering speedometer hand.)
So, my speedometer seems to have no margin for error at all.
I use the cruise control in my 18"-wheel E89 on average speed camera roads. Limit 50 - set at 50. My GPS-based speed camera locator screams at the same points + 1 mph.
(The the cruise control indicator can be fixed exactly on the speedometer and is easier to read than a wandering speedometer hand.)
So, my speedometer seems to have no margin for error at all.
Vidi, vici, veni