MPH Difference - BMW Luxury Touring Community
 
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post #1 of 14 Old Aug 9th, 2007, 6:10 am Thread Starter
 
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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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post #2 of 14 Old Aug 9th, 2007, 6:41 am
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Hi Steve, do a search on 'speedometer error' and you'll find what your looking for.

  • 2005 LT - 17 countries, 2 CONTINENTS & counting !
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  • 1974 Triumph Bonneville 750

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post #3 of 14 Old Aug 9th, 2007, 7:38 am
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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

Stevie Shreeve
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post #4 of 14 Old Aug 9th, 2007, 12:17 pm
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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.

John
2009 K1300GT Red Rocket
2009 R1200GS (Gone)
2005 K1200LT Ocean Blue Blue Wizard 110 K and counting...
2006 Bushtec Turbo+2 Spell
2004 330 Ci Convertable
K4AN

Have ridden a Motorcycle in all 48
But lack DE, MA, RI and CT with the 2005 LT

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post #5 of 14 Old Aug 9th, 2007, 1:14 pm
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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

========================================
When life throws you a curve, LEAN INTO IT!!!
2000 R1100RT-P...R.I.P. "Old motorcycle"
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2004 K1200LT "Lick and Tickle"
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post #6 of 14 Old Aug 9th, 2007, 5:02 pm
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fix it

Why doesn't BMW do something about this at the factory?


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R1200GSA
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Tony Quick
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post #7 of 14 Old Aug 9th, 2007, 5:04 pm
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10% for me. I just use the GPS.

Jamie Kiel
2002 K1200LT Silver
2005 Harley Davidson Springer Classic
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post #8 of 14 Old Aug 9th, 2007, 8:23 pm
 
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It's not just a BMW thing. For some reason all motorcyces are off by about the same amount?
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post #9 of 14 Old Aug 10th, 2007, 12:07 am
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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.

2011 BMW 1600GTL
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post #10 of 14 Old Aug 10th, 2007, 12:58 am
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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.

05' LT Dark Grey, "Battle Star"
14' KTM 1190
03' KTM 450 EXC Dually
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post #11 of 14 Old Aug 10th, 2007, 4:49 am
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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.

Robert in Northern NJ

'09 R12GS, '08 R12RT, '03 R1150RT, '01 F650GS - time to thin the herd?


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post #12 of 14 Old Aug 10th, 2007, 5:07 pm
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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

Graham Wintersgill
On the bonnnie bonnie banks of Loch Lomond

2001 K1200LT

1995 K75RT now deceased
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post #13 of 14 Old Aug 10th, 2007, 9:04 pm
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My 05 is off about 6-8% depending on speed. I just use the GPS as it is accurate with my Car and Truck.

Manny
Where is the nearest Tims?

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Need to stay awake

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post #14 of 14 Old Aug 11th, 2007, 2:53 pm
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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
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