|
|
|
07-02-2008, 03:48 PM | #67 | |
Major General
124
Rep 5,627
Posts |
Quote:
Tom |
|
Appreciate
0
|
07-02-2008, 04:30 PM | #69 | |
Banned
76
Rep 5,970
Posts |
Quote:
The same cluster is used on everything from a 2WD light duty all the way up to the 4WD diesels, so even more. The tires aren't the issue here. That's an easy calculation that's done in the ECU. What is happening is BMW is shooting low, so in case of a manufacturing varience they are still within the applicable laws. My question is why are they allowing for so much varience? If my speedometer was at the upper limit of what they consider acceptable (10% +2.4MPH) I'd be raising hell with my dealer. That would mean that at an indicated 80MPH you would only be going 69.6MPH. That's absurd. As it is it's not nearly that bad, I just question why it can't be better. With factory sized tires on it my GTO was less than 1MPH off. Same goes for my GF's Prius. I just don't get why BMW doesn't dial it in a little closer. |
|
Appreciate
0
|
07-02-2008, 07:13 PM | #70 |
Major General
124
Rep 5,627
Posts |
Maybe I've been lucky, but my last three BMW cars have been off by no more than 3% at 60 mph; that is reading between 60 and 62 at a true 60. And as I posted to another thread, I've disovered that my 1er's odometer actually is almost 2% slow. So it seems as if the errors aren't consistent although no one seems to be reporting anything greater than 5%.
FWIW, my '06 BMW RT motorcycle reads 7% high at 60 - the identical error that Motorcycle Consumer News reported in their test of that model. Tom |
Appreciate
0
|
07-03-2008, 01:09 AM | #71 |
Ronnie
15
Rep 556
Posts |
Again ... if this really annoys you, switch on the secret menus, select option 8.0, and tadaa ... there you have it, the real speed. In my 323i, the secret menu usually reads within .2km/h out from my GPS.
__________________
"Lucy" 128i / Sedona Red / Coral Red / Premium Package / Premium Sound |
Appreciate
0
|
07-03-2008, 07:09 AM | #72 | |
Banned
76
Rep 5,970
Posts |
Quote:
Knowing the speed isn't the issue. Obviously we've got GPS systems displaying the speed....that's how we know it's off in the first place. It's the fact that the needle doesn't match the actual speed that bothers everyone. Why should you have to get into some menu to display your actual speed when you've got a big ass indicator that's right in front of and put there for that purpose?:iono: |
|
Appreciate
0
|
07-03-2008, 10:30 AM | #73 |
Ronnie
15
Rep 556
Posts |
Because you bought a $40000 car from a safety minded, litigation anal, German car manufacturer. And ... they're not going to let you adjust it, get over it !!
__________________
"Lucy" 128i / Sedona Red / Coral Red / Premium Package / Premium Sound |
Appreciate
0
|
07-03-2008, 01:28 PM | #74 |
Banned
76
Rep 5,970
Posts |
Or maybe....you could just bow out of the thread because you're not going to covince anyone here that we've just got to live with it. What's the point of making comments like that? It brings nothing to the discussion.
|
Appreciate
0
|
07-03-2008, 05:00 PM | #75 |
Ronnie
15
Rep 556
Posts |
Of course it adds to the thread, and you do have to live with it. This topic has come up a number of times, and readers need to know quickly ... it is not a fault, it is a design feature, it can't be changed.
And if you are concerned you can actually work out the true differential using the secret menus so you know what is really going on, without having to spend money on a GPS.
__________________
"Lucy" 128i / Sedona Red / Coral Red / Premium Package / Premium Sound |
Appreciate
0
|
07-06-2008, 10:15 PM | #76 |
Private
1
Rep 75
Posts |
Nvm....I won't bite and stay nice. I'm sure somebody else will do the dirty work for me =P
__________________
Cobb | Protuned by PTF | AMS Intercooler | BMS DCI | ER Charge Pipe | Synapse BOV | Aquamist HFS-4 Meth | UR Catless DP | UR Mid-pipe and Exhaust |
|
Appreciate
0
|
07-17-2008, 09:48 PM | #77 |
Private First Class
10
Rep 149
Posts |
Speedo way off....
Driving along the interstate earlier doing (I thought) 78 mph. My Escort 9500i picks up a cop ahead and displays my speed (with it's built-in gps) as 72.
6 mph off?!!!! :iono: I tested it a few more times. 6 mph off every time. That's worse than the digital speedo on my bike. That sucks. |
Appreciate
0
|
07-17-2008, 09:50 PM | #78 |
No longer moderate
325
Rep 4,401
Posts |
I'm going to merge this with the existing speedo off thread:
http://www.1addicts.com/forums/showthread.php?t=11429 |
Appreciate
0
|
07-17-2008, 10:56 PM | #79 |
Major General
5002
Rep 6,864
Posts |
Meh, I dont think its a huge deal. When the MkV GTI's came out a few years back it was discovered that the speedos were off about 10% (reading on the fast side). I just got used to it and I drive accordingly.
I think someone mentioned earlier in the thread that BMW's may have a secret electric readout (like my VW does) accessible to display the actual speed. As long as the speeds reading slow then I dont see what the big deal is. |
Appreciate
0
|
07-18-2008, 10:33 AM | #80 |
Major
34
Rep 1,002
Posts |
I guess what bothers me is if they have a secret display that tells the actual speed, why not display it in the first place. Oh well.
__________________
"Don't run, you'll only die tired" ~ Gunship Pilot
|
Appreciate
0
|
07-18-2008, 11:02 AM | #81 | |
Banned
76
Rep 5,970
Posts |
Quote:
It's worth noting that the averge speed display is accurate. If you set the cruise at 80MPH indicated, and then reset the average speed and drive for a while, the average will show 77MPH. I bounced this off my average moving speed on my GPS over several hunderd miles and the two were withing a couple of tenths of each other. |
|
Appreciate
0
|
11-21-2008, 08:50 AM | #82 |
Lieutenant
20
Rep 564
Posts |
Glad I found this thread instead of making a new one..
Now I know an OBDII reader isnt the most accurate thing in the world, but i saw something very strange when using my live data today... Cruising EXACTLY 80mph on the speedo for a long while. Hooked up my OBDII reader.. went to live settings, mph. It said 73-74mph exactly. So either the OBDII is inaccurate, or the speedo is WAY off. And I've seen speedo problems this bad on some of my previous cars also. Like my 2006 GTI. |
Appreciate
0
|
11-21-2008, 08:51 AM | #83 |
Lieutenant
20
Rep 564
Posts |
|
Appreciate
0
|
11-21-2008, 09:00 AM | #84 |
Lieutenant
34
Rep 531
Posts |
Guys, just read Mad Dragon's post again, PLEASE!
http://www.1addicts.com/forums/showp...3&postcount=12 This is a fact of life. There IS no right or wrong. This is the way it was, from the 1989 E34 I owned up to the two 1ers and the E39 I have now. If it's off by 10kph, then that's BAD. Complain. If it's in the range of 5kph, that's THE WAY IT WAS DESIGNED. EDIT: Just an FYI. On a GPS, your position is determined every ±1 sec and calculates the distance travelled from the last logged position. The speed is in fact an average over the last few seconds. Take that with an extreme grain of salt. Factor this in and you COULD potentially see that ugly 8kph or so differential because of GPS error. Next, as your tires wear, the speed will change AGAIN. The car manufacturers have to compensate for this as most people aren't smart enough to understand. The new Golfs have a Winter tire mode that actually compensates for several size changes I hear. For a good calc of speed deviation due to tire size, plug it in here: http://www.miata.net/garage/tirecalc.html
__________________
|
Appreciate
0
|
11-27-2008, 07:02 AM | #86 | |
Major
34
Rep 1,002
Posts |
Quote:
I have timed it on the mileage markers as well, here in the U.S. we have those on the interstate so that you can determine more accurately your speed. The GPS was spot on, the speedo was greater than 5% off. As to the tire wear, if your speedo is already reading fast on new tires, it will only get worse as the smaller radius/diameter creats a smaller circumfrence meaning you travel less with each revolution. Still curious to know if this can be recalibrated by the dealer?
__________________
"Don't run, you'll only die tired" ~ Gunship Pilot
|
|
Appreciate
0
|
11-27-2008, 07:36 AM | #87 |
Captain
39
Rep 812
Posts |
Given the diameter of the tyre will change by ~2-3% during its life, the "error" you measure at one extreme will be somewhat larger than at the other. Manufacturers need to make sure that the speedo reads *at least* the real speed under either condition... Given there isn't a mechanism for the car to measure the wheel diameter, buidling in some "contingency" speed reading is the only way to do it...
__________________
2019+ BSM M2C 2011-2012: VO 1M Coupe, many toys, Evolve Stage 3. 2008-2011: 135i M Sport Le Mans Blue / Lemon / HGSL. Evolve OBD remap - 390bhp. Also in the family: X3 M40d / Audi S4 (V8)
|
Appreciate
0
|
11-27-2008, 08:03 AM | #88 | |
Major
34
Rep 1,002
Posts |
Quote:
__________________
"Don't run, you'll only die tired" ~ Gunship Pilot
|
|
Appreciate
0
|
Bookmarks |
|
|