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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 10-31-2013, 03:29 PM
strongheart strongheart is offline
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New Owner, Speedo is inaccurate

Hello all. I bought a 2006 330 xi and I have an issue. My speedo is not accurate. It shows 40 but im really travelling at 36 mph, when the speedo says 80 mph im actually going 76 MPH. I know this because both of my GPS units say this. Also to check , i drove next to a friend of mine and we were at the same exact pace yet my speedo is still 4 mph less than whats actually displayed.

Is this a common problem? It has the sport package. The tires that are on it are 225/45/17 all around. Is this the stock size for the sport package?

Last edited by strongheart; 10-31-2013 at 03:32 PM.
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  #2  
Old 10-31-2013, 03:45 PM
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Depends on whether you consider it a problem. It is certainly common. And if I remember the discussions about it, the general consensus is that is intentional on BMW's part because of regulations related to the fact that speedometer can never read high, but can read low and still meet the standards.

Lots of discussions about this topic in many strings on this forum.
Check out Nordic's Sticky on conducting searches and you'll find much to read about the issue.
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Old 10-31-2013, 03:53 PM
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New Owner, Speedo is inaccurate

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Old 10-31-2013, 04:12 PM
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Old 10-31-2013, 04:29 PM
bennyg1 bennyg1 is offline
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Re: New Owner, Speedo is inaccurate

Short answer speedos are not 100% accurate and are deliberately calibrated to have the inaccuracy show as overestimation

It means you need not stress if your needle goes a little bit over the limit.
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Old 10-31-2013, 04:30 PM
strongheart strongheart is offline
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thanks for the info. problem is I will just drive faster to compensate lol What are the stock size tires on this car? It has the sport package, some info says 17 staggerd some 18. not sure which replacement sizes to get since I want to make it staggered again. The rims are 17". can they use the wider tires in the rear even though the rims now have even tires all around?

Last edited by strongheart; 10-31-2013 at 04:33 PM.
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Old 10-31-2013, 06:22 PM
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Quote:
Originally Posted by strongheart View Post
thanks for the info. problem is I will just drive faster to compensate lol What are the stock size tires on this car? It has the sport package, some info says 17 staggerd some 18. not sure which replacement sizes to get since I want to make it staggered again. The rims are 17". can they use the wider tires in the rear even though the rims now have even tires all around?
My sources show that the '06 330 xi came originally equipped with 225/45R17 91H front and rear on 8.0" (J) wheels. The sport package came with 18" tires according to my source.
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Old 10-31-2013, 06:31 PM
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Quote:
Originally Posted by strongheart View Post
Hello all. I bought a 2006 330 xi and I have an issue. My speedo is not accurate. It shows 40 but im really travelling at 36 mph, when the speedo says 80 mph im actually going 76 MPH. I know this because both of my GPS units say this. Also to check , i drove next to a friend of mine and we were at the same exact pace yet my speedo is still 4 mph less than whats actually displayed.

Is this a common problem? It has the sport package. The tires that are on it are 225/45/17 all around. Is this the stock size for the sport package?
Read this.

http://www.bimmerfest.com/forums/sho...62&postcount=8

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Old 10-31-2013, 06:34 PM
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E.U. regulations (UNECE) dictate that the indicated speed must never be less than the actual speed, i.e. it should not be possible to inadvertently speed because of an incorrect speedometer reading. The OP's "error" sounds about right.
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Old 10-31-2013, 06:56 PM
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Originally Posted by MMME30W View Post
Read this.

http://www.bimmerfest.com/forums/sho...62&postcount=8

In memory of Herr Baumann.
+1

Here in the US of A this may seem superfluous, but in Europe it has significance. We were in Southern France earlier this fall and were clocked by a speed camera going 95 km/hr in a 90 km/hr zone. This translates to going 59 mi/hr in a 56 mi/hr zone and the fee amounted to about $85 USD. And this was in a Hyundai!!!! What is amazing to me is that the ticket was literally 6 pages and included the European standard for speedometer readings which meant that we could have actually been going 92 km/hour (the horror!!)

Personally, I kind of like the fact that if I've settled into what seems to be 10-12 miles over the speed limit, I'm still in that magic '9 your fine' zone of grace the US LEO's tend to tolerate.
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  #11  
Old 10-31-2013, 07:02 PM
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  #12  
Old 10-31-2013, 07:13 PM
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Originally Posted by Nordic_Kat View Post
+1

Here in the US of A this may seem superfluous, but in Europe it has significance. We were in Southern France earlier this fall and were clocked by a speed camera going 95 km/hr in a 90 km/hr zone. This translates to going 59 mi/hr in a 56 mi/hr zone and the fee amounted to about $85 USD. And this was in a Hyundai!!!! What is amazing to me is that the ticket was literally 6 pages and included the European standard for speedometer readings which meant that we could have actually been going 92 km/hour (the horror!!)

Personally, I kind of like the fact that if I've settled into what seems to be 10-12 miles over the speed limit, I'm still in that magic '9 your fine' zone of grace the US LEO's tend to tolerate.
I guess you were in a Hyundai because you couldn't find a Chevy Aveo.

The U.S. doesn't have a speedometer accuracy reg. for passenger vehicles (only an ancient (5 mph) reg. for commercial vehicles). There may be a SAE speedometer calibration standard for automakers.

Considering what we know now (except for those who drive Hyundais in Europe ), I would guess that European car drivers in the U.S. tend to get fewer speeding tickets than drivers of domestic models?
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  #13  
Old 10-31-2013, 10:12 PM
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Originally Posted by pointandgo View Post
...
The U.S. doesn't have a speedometer accuracy reg. for passenger vehicles (only an ancient (5 mph) reg. for commercial vehicles). There may be a SAE speedometer calibration standard for automakers.
From the car and driver article: "So we sought out the rule book to find out just how much accuracy is mandated. In the U.S., manufacturers voluntarily follow the standard set by the Society of Automotive Engineers, J1226, which is pretty lax. To begin with, manufacturers are afforded the latitude to aim for within plus-or-minus two percent of absolute accuracy or to introduce bias to read high on a sliding scale of from minus-one to plus-three percent at low speeds to zero to plus-four percent above 55 mph. And those percentages are not of actual speed but rather a percentage of the total speed range indicated on the dial. So the four-percent allowable range on an 85-mph speedometer is 3.4 mph, and the acceptable range on a 150-mph speedometer is 6.0 mph"

So, while no FMVSS is specified, the result is a standard.
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  #14  
Old 11-01-2013, 07:04 AM
fdriller9 fdriller9 is online now
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You can have the correction coded off in the KOMBI module. There is a value for both the digital display (which needs to be activated on non-m models) and analog dials.
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  #15  
Old 11-03-2013, 12:14 PM
strongheart strongheart is offline
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nice. I am going to pick up the USB cable so I can change options with the coding software.

I noticed today there is another gauge on the outer rim of the speedometer that popped up today for a short time but then hid away from view when it went all the way down. does anyone know what it is for?
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  #16  
Old 11-03-2013, 01:14 PM
gcreese gcreese is offline
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Originally Posted by strongheart View Post
nice. I am going to pick up the USB cable so I can change options with the coding software.

I noticed today there is another gauge on the outer rim of the speedometer that popped up today for a short time but then hid away from view when it went all the way down. does anyone know what it is for?
You may be referring to the indicator for the Cruise Control, which zooms around on the periphery of the speedometer. Check it out in the User Manual to see if that's what you saw.
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  #17  
Old 11-03-2013, 03:40 PM
Tom K. Tom K. is offline
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You may be referring to the indicator for the Cruise Control, which zooms around on the periphery of the speedometer. Check it out in the User Manual to see if that's what you saw.
That certainly sounds like the cruise control indicator.

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  #18  
Old 11-03-2013, 07:55 PM
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I suppose that if you can calculate the error percentage of the speedo with the stock tires, you can choose replacement tires with just enough increased diameter to compensate for the error.

Tire rack posts the diameters and other specs of all their tires, including revolutions per mile and the percentage of difference in revolutions per mile of tires A through Z.
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Last edited by Pilgrim; 11-03-2013 at 07:56 PM.
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Old 11-04-2013, 05:37 PM
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+1 for coding. The 'v display' tracks what my GPS says

The same info can be seen using the Torque app and a ~$20 ELM327 bluetooth interface. That's a breeze to get running but cannot do coding on BMWs. I did use it to turn off the reverse beep on my Prius but I guess Toyota's coding is simpler.

Interestingly my MX-5 speedo is almost spot on. I think the Prius shows only slightly over.
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Last edited by MP3_E46; 11-04-2013 at 05:39 PM.
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  #20  
Old 11-08-2013, 08:17 AM
strongheart strongheart is offline
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Originally Posted by MP3_E46 View Post
+1 for coding. The 'v display' tracks what my GPS says

The same info can be seen using the Torque app and a ~$20 ELM327 bluetooth interface. That's a breeze to get running but cannot do coding on BMWs. I did use it to turn off the reverse beep on my Prius but I guess Toyota's coding is simpler.

Interestingly my MX-5 speedo is almost spot on. I think the Prius shows only slightly over.
Im not sure what you mean by cannot do coding on BMWs. I thought you could modify the code to change things like disabling seat belt chime, fixing the speedometer accuracy, or activating the digital speedo.
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Old 11-08-2013, 08:28 AM
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Originally Posted by strongheart View Post
Im not sure what you mean by cannot do coding on BMWs. I thought you could modify the code to change things like disabling seat belt chime, fixing the speedometer accuracy, or activating the digital speedo.
Via an ELM 237? I use a d-can USB cable and BMW specific coding software.
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  #22  
Old 11-08-2013, 08:46 AM
ctuna ctuna is offline
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Digital speed can have the correction factor nulled.

Digital speed can have the correction factor nulled.
Apparently they put in a correction factor to make the speed
look high and the guys in the coding forums have figured out
how to disable it for digital speed.
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  #23  
Old 11-08-2013, 09:30 AM
strongheart strongheart is offline
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Via an ELM 237? I use a d-can USB cable and BMW specific coding software.
I bought the cable for it its on its way BMW INPA/Ediabas SSS NCS K+D-CAN USB Interface
and will install INPA, EDIABAS, NCSExpert, NCS Dummies, DIS/GT1, EasyDIS, & Progman so I can modify a wide array of options.
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  #24  
Old 11-08-2013, 09:32 AM
strongheart strongheart is offline
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I also have a question. I see the car can support 17x8 and rear 17x8.5 staggered. Do I need to buy rims that are 8.5 inches for the rear or can I just put on wider tires in the rear? My car came with the type 158 rims. I want to keep 17" wheel size but still run staggered even if I have to buy wider rims for the rear. Can I buy type 161 wheels and install them? WIll it mess with my all wheel drive?

Im trying to figure out acceptable offsets if I want to run other BMW style wheels. Is there a chart or page that shows which rims will fit on which model BMWs?

Last edited by strongheart; 11-08-2013 at 10:01 AM.
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Old 11-08-2013, 11:25 AM
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Originally Posted by strongheart View Post
I also have a question. I see the car can support 17x8 and rear 17x8.5 staggered. Do I need to buy rims that are 8.5 inches for the rear or can I just put on wider tires in the rear? My car came with the type 158 rims. I want to keep 17" wheel size but still run staggered even if I have to buy wider rims for the rear. Can I buy type 161 wheels and install them? WIll it mess with my all wheel drive?

Im trying to figure out acceptable offsets if I want to run other BMW style wheels. Is there a chart or page that shows which rims will fit on which model BMWs?
You are only allowed one unresearched post per thread, as per EU regulations.
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