speedo/odo?

J08M3 · 03-12-2009, 08:07 PM

So if our speedometers are reading faster than we are actually going. Does that mean our odometers are adding miles quicker? The speedo being a bit fast doesn't really bother me too much. But if it's racking up miles on the odometer faster than real life that's not cool.

URBAN LEGEND · 03-12-2009, 08:22 PM

Why do you say this? My escort 9500's speed and the digital speedo on my M3 read the same. So mine is reading accurate. Did you change wheels?

J08M3 · 03-12-2009, 08:24 PM

When I drive by those radar speed signs I'm generally a couple MPH faster than they say (although they seem highly inaccurate as the difference is never the same) and most people on here have posted about their cars not going as fast as their speedo says.

URBAN LEGEND · 03-12-2009, 08:27 PM

Mine is spot on. Maybe it got fixed before DCT did. My car was built Jan 31st 09.

rzm3 · 03-12-2009, 10:07 PM

Yes the odometer is optimistic too. I remember an article about Hondas having such optimistic odometers that they were forced by law to extend the warranty period. Do a search on google and you can find more info.

Mr Tonka · 03-12-2009, 10:34 PM

sucks doesn't it.

J08M3 · 03-12-2009, 11:09 PM

Great so I'm paying for 10,000 miles a year and I'm not really getting that.

skierman64 · 03-12-2009, 11:18 PM

My speedo is off about 3mph at 60mph, verified by radar and GPS.

Mr Tonka · 03-12-2009, 11:35 PM

Quote:

Originally Posted by J08M3

Great so I'm paying for 10,000 miles a year and I'm not really getting that.

Nope. My wife drives a F150 and she got a Diablo programer which allows you to program the revolutions per mile of your tire size. It didn't take me long to figure out what to do with that.

It would be nice if the same was available for us. Does anyone know if that kind of stuff is adjustable when getting tuning software?

spyderco10 · 03-13-2009, 02:21 AM

aren't most cars' speedos off by a few mph?

gr8000 · 03-13-2009, 07:33 AM

I understand that regulations require that speedos are optimistic. Mine reads 270km/hr at the electronic speed limiter which is 250km/h true (also verified by gps). I read somewhere in another thread that the BMW speedos build in 5% speed error + 4km/hr, which I think is what the case is (250 x 1.05 = 262.5 + 4 = 266.5km/hr which is pretty close to what the speedo says).

But I am not sure if true or indicated odo data are used for milage and/or average fuel consumption claculations.

03-12-2009, 08:07 PM	#1
J08M3 Major General 286 Rep 6,007 Posts Drives: 2011 M3 COUPE Join Date: May 2008 Location: NEW YORK iTrader: (8)	speedo/odo? So if our speedometers are reading faster than we are actually going. Does that mean our odometers are adding miles quicker? The speedo being a bit fast doesn't really bother me too much. But if it's racking up miles on the odometer faster than real life that's not cool. __________________
	Appreciate 0 Tweet Quote

03-12-2009, 08:22 PM	#2
URBAN LEGEND Rocky 412 Rep 3,085 Posts Drives: 16 M5, 18 ZL1 1LE, 18 M3 Join Date: Feb 2009 Location: Brenham TX iTrader: (0)	Why do you say this? My escort 9500's speed and the digital speedo on my M3 read the same. So mine is reading accurate. Did you change wheels? __________________ 22 Audi RS E-Tron GT 21 Model S Plaid
	Appreciate 0 Quote

03-12-2009, 08:24 PM	#3
J08M3 Major General 286 Rep 6,007 Posts Drives: 2011 M3 COUPE Join Date: May 2008 Location: NEW YORK iTrader: (8)	When I drive by those radar speed signs I'm generally a couple MPH faster than they say (although they seem highly inaccurate as the difference is never the same) and most people on here have posted about their cars not going as fast as their speedo says. __________________
	Appreciate 0 Quote

03-12-2009, 08:27 PM	#4
URBAN LEGEND Rocky 412 Rep 3,085 Posts Drives: 16 M5, 18 ZL1 1LE, 18 M3 Join Date: Feb 2009 Location: Brenham TX iTrader: (0)	Mine is spot on. Maybe it got fixed before DCT did. My car was built Jan 31st 09. __________________ 22 Audi RS E-Tron GT 21 Model S Plaid
	Appreciate 0 Quote

03-12-2009, 10:07 PM	#5
rzm3 Moderator 673 Rep 4,737 Posts Drives: E92 M3 Join Date: Aug 2007 Location: USA iTrader: (18)	Yes the odometer is optimistic too. I remember an article about Hondas having such optimistic odometers that they were forced by law to extend the warranty period. Do a search on google and you can find more info.
	Appreciate 0 Quote

03-12-2009, 10:34 PM	#6
Mr Tonka is probably out riding. 6058 Rep 2,292 Posts Drives: Something Italian Join Date: Feb 2009 Location: Sweatypeninsula iTrader: (0)	sucks doesn't it. __________________ "There is no greater tyranny than that which is perpetrated under the shield of the law and in the name of justice. -Charles de Secondat"
	Appreciate 0 Quote

03-12-2009, 11:09 PM	#7
J08M3 Major General 286 Rep 6,007 Posts Drives: 2011 M3 COUPE Join Date: May 2008 Location: NEW YORK iTrader: (8)	Great so I'm paying for 10,000 miles a year and I'm not really getting that. __________________
	Appreciate 0 Quote

03-12-2009, 11:18 PM	#8
skierman64 Brigadier General 127 Rep 3,071 Posts Drives: E92M3-E46M3-E46Wagon-E89Z4-E36 Join Date: Dec 2006 Location: Greater St Louis Metro area iTrader: (1) Garage List 1994 325is Race Car [0.00] 2011 BMW Z4 [0.00] 1998 M3 Coupe [0.00] 2008 M3 Coupe [0.00]	My speedo is off about 3mph at 60mph, verified by radar and GPS. __________________ Invest Wisely...The best mod for your money?? BMWCCA high performance driver's school. The mod that lasts a lifetime and improves the performance of any car you drive[/LEFT]
	Appreciate 0 Quote

03-13-2009, 02:21 AM	#10
spyderco10 Colonel 63 Rep 2,426 Posts Drives: AW E92 M3 6MT Join Date: Jul 2008 Location: Honolulu, HI iTrader: (0)	aren't most cars' speedos off by a few mph? __________________ “For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.” - John 3:16
	Appreciate 0 Quote

03-13-2009, 07:33 AM	#11
gr8000 Major 72 Rep 1,171 Posts Drives: E92 M3 - DCT Join Date: Jul 2008 Location: Athens, Greece iTrader: (0)	I understand that regulations require that speedos are optimistic. Mine reads 270km/hr at the electronic speed limiter which is 250km/h true (also verified by gps). I read somewhere in another thread that the BMW speedos build in 5% speed error + 4km/hr, which I think is what the case is (250 x 1.05 = 262.5 + 4 = 266.5km/hr which is pretty close to what the speedo says). But I am not sure if true or indicated odo data are used for milage and/or average fuel consumption claculations.
	Appreciate 0 Quote