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post #1 of 4 Old Aug 9th, 2009, 1:05 pm Thread Starter
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Question differences between OB computer and speedometer

I just returned from a cross country trip on my 2003 LT. I noticed a couple of things
a) the average speed on the OB after resetting is about 10kph less than the speedometer Which is right? Can either be recalibrated?
b) the L/100km reading somtimes appears 'stuck' and shows a reading that's out to lunch. Way too low.
c) the kms left on the remaining gas seems a bit optimistic. How does it do the calculation?

I tried searching but couldn't find the answers. Maybe somewhere someone has explained it all?

Wayne
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post #2 of 4 Old Aug 9th, 2009, 2:25 pm
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Re: differences between OB computer and speedometer

Quote:
Originally Posted by waynejones
I just returned from a cross country trip on my 2003 LT. I noticed a couple of things
a) the average speed on the OB after resetting is about 10kph less than the speedometer Which is right? Can either be recalibrated?
b) the L/100km reading somtimes appears 'stuck' and shows a reading that's out to lunch. Way too low.
c) the kms left on the remaining gas seems a bit optimistic. How does it do the calculation?

I tried searching but couldn't find the answers. Maybe somewhere someone has explained it all?

Wayne
Yes, the speedometer on pre 2005 LT's can be calibrated, many posts here over the years, some with pictures on how to do it. It requires removing the speedometer module from the instrument panel and soldering two jumpers on the printed circuit board, one between the two solder pads labled JB, another between the pads labeled JC. This only affects the speedometer, not the odometer.

There is a procedure for calibrating the BC computer mileage calculation. Right now I do not remember where to find it. I am sure someone will come up with it.

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post #3 of 4 Old Aug 9th, 2009, 2:40 pm
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Re: differences between OB computer and speedometer

HERE is one thread with pictures.

HERE is the section in the Hall of wisdom that has three different threads on speedometer accuracy.


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post #4 of 4 Old Aug 9th, 2009, 2:43 pm
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Re: differences between OB computer and speedometer

Quote:
Originally Posted by dshealey
There is a procedure for calibrating the BC computer mileage calculation. Right now I do not remember where to find it. I am sure someone will come up with it.
It's right here.

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