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#1
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Your Speedometer?
K
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#2
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I would be surprised if it was only 4 mph out. BMW designs speedometers to read optimistic by about 4% + a few mph, so that they will never be liable for a speedometer reading too low.
Edit: EC Regulation 39 (speedometer accuracy) states that a speedometer may never read low, and that the indicated speed must be no more than (true speed x 1.1) + 4 km/hr. Due to production tolerances, tire size variances, etc, manufacturers will use a portion of that tolerance to ensure they never read low. BMW speedometers have long been considered some of the least accurate out there, by design.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue Last edited by JCL; 05-31-2010 at 05:31 PM. |
#3
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Got a 2011 X6M... Funny u mention this... I was passing one of those radar signs that tells u your going too fast and I actually though to myself that it seemed to be 4 mph lower than what my dash said.
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#4
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No ///M but my 4.8 always reads 2mph faster than what radar signs and my gps linked detector says. Funny side note, I have been told lamborghinis read something like 10mph faster, which in turn runs the odometer up faster and leaves owners out of warranty 10% faster.
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2011 50i BS/Black Nevada (gone) 2007 4.8i AW/Tobacco |
#5
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Mine is also 4mph fast. I figured this with both an airport radar sign and calculating a 10 mile run via the stopwatch.
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#6
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Quote:
The rules call for a % variation (on the high side) of the speedometer. Their is a built-in adjustment factor. Odometers read accurately.
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2007 X3 3.0si, 6 MT, Premium, White Retired: 2008 535i, 6 MT, M Sport, Premium, Space Grey 2003 X5 3.0 Steptronic, Premium, Titanium Silver 2002 325xi 5 MT, Steel Grey 2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue |
#7
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The OBC shows the correct speed, which is there the odometer is calculated from. Since I've relocated my OBC to my glovebox, I use the the navi screen to show the exact speed I'm going. I just always go 5mph on the speedo, knowing I'm really only doing like 2-3 over.
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650hp 10 X5///M - Stage 2, Vibrant 1794's , gutted cats, custom intake, AC Forged 22's 325hp 98 BMW 740iL - ///M5 6spd, www.bavengine.com w/ Performance Option, electric fan, CF intake tube w/ heatshield, Mag 14816 w/ notched bumper, Bilstein/H&R Stage II/Powerflex 600+hp 02 Harley F150 - MHP900 Stage 3 engine, KB2.3, 8# lower, 60# inj, Walbro FP's 135hp 01 TL1000R - M4 full exhaust, K&N, Yosh box, -1/+2 gears, 2CT's
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