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  Topic Review (Newest First)
Aug 11th, 2007 3:53 pm
BecketMa Many of us would feel blessed if our speedos only read 1-2% higher.

When my wife and I took an LT for a test ride, we both marveled at how quiet and smooth it was at 70 MPH! Little did we know our speed was a lot closer to 60 than 70.

When the speed limit was 55, I'd try and maintain a 60 MPH speed on the interstate running through Tucson. My first reaction was disbelief at how many people went speeding way to fast pass me. Then I wondered about the speedo, but decided German's love for precision couldn't tolerate an inaccurate speedo.

When I brought it in for a tune up, there was a flat spot when accelerating, and to have the speedo checked, I was told the speedos were all off by about 10%, and there was a problem with the computer program, causing the flat spot.

People in this group figured out how to bypass the faulty programming, and how to modify the speedo so that it was within 1-2 MPH.

Bob
Aug 10th, 2007 10:04 pm
Newf My 05 is off about 6-8% depending on speed. I just use the GPS as it is accurate with my Car and Truck.
Aug 10th, 2007 6:07 pm
grahamw
Speedo error

from this site
http://www.speed-trap.co.uk/Accused_...ge/The_Law.htm

comes the following info:
'Vehicle construction and use regulations require a vehicle speedometer accuracy to be in the range of -0->+10%. The implications are that it must never under-read - for obvious reasons - but may over-read. As the cost of manufacturing a speedometer with -0% error would be very costly they all over-read by a few percent without exception. Even if speed is measured correctly the display may not be accurate, so a speedometer error is allowed.' These rules probably apply to the EU as well.

And I seem to recall Skoda having to recall a lot of Octavias due to accurate speedos.

HTH
Aug 10th, 2007 5:49 am
rdwalker About 10% high for me. I use Sigma BC1200 bicycle computers on all my bikes - on an 'LT it will clip on to the handlebar shell next to brake reservoir, looking almost OEM.

GPS and bike computers - never look at the instrument speedos.
Aug 10th, 2007 1:58 am
dmatson My 05' is about 3mph off up to about 80 then it gets a bit more. Last trip I was up to what I thought was just under 135mph but the GPS said 127 but then again I wasn't really looking to hard at the speedo.
Aug 10th, 2007 1:07 am
HornHonker
Quote:
Originally Posted by Big_E
It's not just a BMW thing. For some reason all motorcyces are off by about the same amount?
They do have police LTs in Europe. I would guess their spedos are accurate.
My police RT spedo is bang on with my gps.
Aug 9th, 2007 9:23 pm
Big_E It's not just a BMW thing. For some reason all motorcyces are off by about the same amount?
Aug 9th, 2007 6:04 pm
jamiekiel 10% for me. I just use the GPS.
Aug 9th, 2007 6:02 pm
quickbeemer
fix it

Why doesn't BMW do something about this at the factory?
Aug 9th, 2007 2:14 pm
petevandyke
Quote:
Originally Posted by jzeiler
The only known fix (05 and up) is to take it apart and remove the pointer, then put it back on a bit below zero. The older bikes had a jumper matrix in the speedo you could get real close to accurate by changing jumpers. I personally just use the GPS and never look at the speedo.

I second that...

if you're only 1.5 to 2 mph off, you have a miracle bike, most of us are close to 10% off...for me:

GPS Speedo
54 60
63 70
73 80
80-81 90
124.4 138
Aug 9th, 2007 1:17 pm
jzeiler
Quote:
Originally Posted by ferggie
I have noticed about 1.5 - 2 mph diference between the LT speedo and my GPS read out. Has anyone else seen a difference on there ride as well. Can the dealer correct this issue?
The only known fix (05 and up) is to take it apart and remove the pointer, then put it back on a bit below zero. The older bikes had a jumper matrix in the speedo you could get real close to accurate by changing jumpers. I personally just use the GPS and never look at the speedo.
Aug 9th, 2007 8:38 am
katnapinn
Quote:
Originally Posted by ferggie
I have noticed about 1.5 - 2 mph diference between the LT speedo and my GPS read out. Has anyone else seen a difference on there ride as well. Can the dealer correct this issue?
Yes this is very common mine is about 6% off at 100 mph on the GPS speedo reads 106
Aug 9th, 2007 7:41 am
Woolly Hi Steve, do a search on 'speedometer error' and you'll find what your looking for.
Aug 9th, 2007 7:10 am
ferggie
MPH Difference

I have noticed about 1.5 - 2 mph diference between the LT speedo and my GPS read out. Has anyone else seen a difference on there ride as well. Can the dealer correct this issue?

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