Speedometer error right? Applies to ALL German european vehicles?

Innocent_Stud · 01-23-2012, 07:00 PM

Was going 20 mph to 21 mph as indicated on my speedometer on a local road near a school zone and a nearby radar speed detector reader showed me an actual speed of 19 mph.

If mine is off around 1-2 mph (also it's Winter season, could affect my tires and tire pressure) so I can't imagine the speedometer error at highway speeds...

Is this all natural for everyone here?

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VividRacing · 01-23-2012, 07:15 PM

Most cars leave the factory with the speedo reading higher than the actual speed. That's part of the reason that most police officers give some leeway to the speed limit.

mdadgar · 01-23-2012, 07:20 PM

http://www.caranddriver.com/features...ometer-scandal

- Mark

Shifter · 01-23-2012, 07:40 PM

Thats interesting!

lkchris · 01-25-2012, 03:41 PM

It's officially called "speedometer advance" and it's required by German law/regulation.

You know, not all brands of tire of the same size rating are actually the same size. Of course a worn tire isn't the same size it once was, either. Manufacturers of cars are required to compensate for this.

Expectations of pinpoint accuracy are unrealistic.

Innocent_Stud · 01-25-2012, 06:45 PM

Yeah I figured. Thanks you guys.

01-23-2012, 07:15 PM	#2
VividRacing SPONSOR Garage is empty, add now Join Date: Mar 2006 Location: Gilbert, AZ Posts: 2,177 Drives: W220, CLS55, C63	Most cars leave the factory with the speedo reading higher than the actual speed. That's part of the reason that most police officers give some leeway to the speed limit. __________________ Arsha K. \| 480-966-3040 x225 \| AIM or E-Mail: Arsha@vividracing.com \|VividRacing.com\| Follow Us On Instagram! @VividRacing @VividArsha ASK ME ABOUT YOUR SPECIAL MBWORLD PRICING HRE Wheels, KW Suspension, Renntech, Kleemann, Meisterschaft Exhausts, Eisenmann Exhausts, Brembo Brakes, Pagid Race Pads, H&R Suspension, Wald Aero, and many more!

01-25-2012, 03:41 PM	#5
lkchris MBWorld Fanatic! Garage is empty, add now Join Date: Sep 2005 Location: Albuquerque Posts: 4,918 Drives: '07 GL320CDI	It's officially called "speedometer advance" and it's required by German law/regulation. You know, not all brands of tire of the same size rating are actually the same size. Of course a worn tire isn't the same size it once was, either. Manufacturers of cars are required to compensate for this. Expectations of pinpoint accuracy are unrealistic. __________________ Kent Christensen Albuquerque '07 GL320CDI

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01-23-2012, 07:20 PM	#3
mdadgar Senior Member Garage is empty, add now Join Date: Feb 2010 Posts: 329 Drives: 2011 GL350 Bluetec, Irridium over Black Leather	http://www.caranddriver.com/features...ometer-scandal - Mark

01-23-2012, 07:40 PM	#4
Shifter Super Member Garage is empty, add now Join Date: Mar 2011 Location: Jacksonville, FL Posts: 668 Drives: ///AMG	Thats interesting!

01-25-2012, 06:45 PM	#6
Innocent_Stud Senior Member Garage is empty, add now Join Date: Dec 2011 Location: Middlesex, NJ Posts: 348 Drives: 03 Nissan Altima 2.5S, 07 MB GL450	Yeah I figured. Thanks you guys.

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