11-10-2017, 07:10 PM | #1 |
Brigadier General
1429
Rep 3,881
Posts |
Speedometer/Odometer Optimistic
I've had my M40i over a week now and I knew the speedometer was reading to fast. So I brought along my Garmin GPS and used an app on my phone to confirm.
Speedometer reads 4 mph fast and the odometer registers an extra 4.4 miles in 18.7 actual miles. Boy, at this rate I'll only be able to put 24,000 actual miles on my 30,000 lease. Those who purchase/finance with the 50,000 mile warranty will be up in about 41,000 actual miles. I hope my math is incorrect. My vehicle has the 21" wheels with Bridgestone Alenza tires. I placed a call to BMW for them to look into it. Anyone else who has taken delivery, doesn't matter which model of X3, check theirs out. Maybe the 21's are to blame. Either way, BMW is going to have to do something about this problem. |
11-10-2017, 07:23 PM | #2 | |
Brigadier General
3091
Rep 3,063
Posts
Drives: 2023 iX M60 Oxide
Join Date: Jun 2007
Location: UT
|
Quote:
You could also test it with a mile marker test. You can look up how to do it, but you can basically set the cruise control and time how long it takes you to go five miles according to highway mile markers, and do the math to get the error. New tires tend to read a bit high, when your tires are worn the circumference will shrink quite a bit and the speedo will then read a few miles slow. You lose about 2/3" in diameter over the life of your tire and that will change your speedo by 1-2 mph at 60 mph. |
|
Appreciate
0
|
11-10-2017, 08:10 PM | #3 | |
Brigadier General
1429
Rep 3,881
Posts |
Quote:
I would think as the tires wear, the speedo/odo will read even faster. It does on motorcycles. As the tire diameter shrinks from wear, the tire spins faster and will make the speedo/odo read even faster. |
|
Appreciate
0
|
11-10-2017, 09:07 PM | #4 | |
Brigadier General
3091
Rep 3,063
Posts
Drives: 2023 iX M60 Oxide
Join Date: Jun 2007
Location: UT
|
Quote:
Edit: so I think I misunderstood what you were saying, it’s true that if you’re going say 35mph and your speedo says 40, if you later go 35mph with smaller tires it will say maybe 42 due to the higher revs. Conversely what I say above is also true, if you go 35 according to your speedo, you’ll get slower in real speed as your tires wear. At any rate there seems to be a discrepancy in the odometer, I’d focus on that first because it sounds like a way bigger variance than the speedo numbers. Last edited by sor; 11-10-2017 at 09:26 PM.. |
|
Appreciate
0
|
11-10-2017, 09:15 PM | #5 | |
Brigadier General
3091
Rep 3,063
Posts
Drives: 2023 iX M60 Oxide
Join Date: Jun 2007
Location: UT
|
Quote:
Find a relatively straight stretch of highway and check your odometer against the mile markers. Last edited by sor; 11-10-2017 at 09:27 PM.. |
|
Appreciate
0
|
11-11-2017, 06:01 AM | #7 | |
Colonel
4692
Rep 2,511
Posts |
Quote:
|
|
Appreciate
0
|
01-22-2020, 04:29 PM | #8 |
New Member
5
Rep 12
Posts |
I know this is an old thread, but thought I'd post here before making a duplicate.
I'm less than a month into my X3 (G01) M40i with 21" wheels. I'm losing miles at a fairly rapid pace. In 766 miles driven so far, I've lost about 45 miles unaccountable for. GPS history (google maps) and my per trip tracker I use for business mileage both agree, but the car mileage is consistently about 6% over. So on a 100 mile trip, the car reads 106. I've traveled the exact same route many times in my prior 2 cars and never had this issue. Could the car be miscalibrated to the tire size? I have two concerns with this: First is that it's going to cost me miles on my lease so 30k miles becomes 28,300. Second, I cannot suddenly bill more miles for the same drive, and my mileage log is therefor completely messed up. This is becoming a major pain in the but. Waiting for a call back from the dealer. Anyone have a suggestion or solution in the meantime? Thanks! |
Appreciate
0
|
01-22-2020, 05:13 PM | #9 |
Internet Weasel
757
Rep 760
Posts
Drives: 2023 X3 M40i
Join Date: Nov 2019
Location: SoCal/PSP
|
It's very normal for a speedo to read high. Every car I've ever had has read 2-4 MPH fast at an actual 70 MPH. I think manufacturers do this intentionally.
It's completely 100% unacceptable, however, for an odometer to read high, particularly by a ridiculous 6%. I would definitely try a mile marker test as recommended earlier in the thread. If yours is indeed overstating your mileage that feels kind of...litigable. |
Appreciate
0
|
01-22-2020, 05:57 PM | #11 |
Major General
1904
Rep 5,097
Posts |
All brands no? Not just BMW and surely not a new phenomenon
__________________
'11 Z4 30i (retired);'11 X3 28i (retired); '15 M235i Stage 1 Dinan (recalled & crushed); '16 M235i Stage 3 Dinan (retired); '15 X3 28i (retired); '14 328i (retired), 2019 X3M40i (retired); Loaded '18 X1 (retired); Loaded '20 X3MC DG, Black/Tan Merino (retired); Loaded '23 X1 Cape York green and Red/Black interior; '23 Audi A4 Allroad Progressiv
|
Appreciate
0
|
01-22-2020, 06:42 PM | #12 |
Captain
149
Rep 666
Posts |
The speedo thing can be 'corrected' with coding:
https://f30.bimmerpost.com/forums/sh....php?t=1278717 What's up with that odometer though?! |
Appreciate
0
|
01-22-2020, 08:00 PM | #13 | |
New Member
5
Rep 12
Posts |
Quote:
I picked up my 2020 M40i with 21's just shy of a month ago, and I've noticed the same issue, though less severe. The Odometer seems to be over by about 6% - it's 42 miles over what I've actually driven - after 703 real miles of driving the odo reads 745. I have a service appointment tomorrow. 🤞 |
|
Appreciate
0
|
01-22-2020, 08:06 PM | #14 | |
New Member
5
Rep 12
Posts |
Quote:
|
|
Appreciate
0
|
01-22-2020, 10:08 PM | #16 | |
Internet Weasel
757
Rep 760
Posts
Drives: 2023 X3 M40i
Join Date: Nov 2019
Location: SoCal/PSP
|
Quote:
|
|
Appreciate
0
|
01-23-2020, 11:09 AM | #17 |
Second Lieutenant
97
Rep 271
Posts |
Mine runs 2MPH over actual across the board, this is typically dialled in for safety reasons to hopefully stop you getting done for speeding, the irony In Sport Plus mode with the Alpina dash tuned in I have 2 digital readouts in the centre of the dash, both read slightly different, I assume they are reading info from different parts of the system.
|
Appreciate
0
|
01-23-2020, 04:33 PM | #18 |
Captain
286
Rep 678
Posts |
This is often the case with ANY BMW . I own three. I've done some minor tire size changes to compensate when they're worn- odometer should not be out though..
|
Appreciate
0
|
01-23-2020, 05:16 PM | #19 |
Private First Class
74
Rep 120
Posts
Drives: MY20 X4 M40i
Join Date: Nov 2019
Location: Denver
|
Try looking through google, previous years BMW owners (myself included), noticed this and it had been explained about a german law, something to do with reading high so you could never blame speeding on tire size or wear, iirc. Speedometers are no longer hooked up directly to the transmission, they are algorithm based on gear, throttle etc. Therefore, you are not incurring extra mileage for having the speedometer being off.
|
Appreciate
0
|
01-23-2020, 05:19 PM | #20 | |
Private First Class
74
Rep 120
Posts
Drives: MY20 X4 M40i
Join Date: Nov 2019
Location: Denver
|
Quote:
|
|
Appreciate
0
|
01-23-2020, 07:03 PM | #21 |
Lieutenant
273
Rep 426
Posts |
Mine is definitely 3-4mph too high.. so I go 5-10 mph faster.
Seriously I hate that it's not spot on.. My Toyota and Lexus are nearly spot on the speedometer. Hmm.. so has someone discovered a way to code it right? The linked post is about 3+ years old. |
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|