Landyjd

Landyjd

Active Member
I have had some suspicions for a while that my odometer is racking up kilometres too fast on my 1986 Ninety. I checked properly yesterday and found that is it reading about 10% further than I had actually driven. Obviously this is not ideal as it mucks up some of the servicing schedules for the engine and vehicle and it devalues the vehicle. It is particularly odd as I am running 235/85 R16 tyres which I am sure have a larger diameter than the originals would have.

Can anyone enlighten me as to what might be causing this? If I went to an autoelectrician would they be able to fix it or would I be able to fix it myself (I have relatively little knowledge of electronics)?

In case it is relevant I should mention that the speedo is conservative by about 5km/hour.


Thanks all
 
its mechanically run so an auto electrician is no good to 'fix' it.

its supposed to read that you are going faster than you actually are, so you dont speed :)
 
Landyjd said:
I have had some suspicions for a while that my odometer is racking up kilometres too fast on my 1986 Ninety. I checked properly yesterday and found that is it reading about 10% further than I had actually driven. Obviously this is not ideal as it mucks up some of the servicing schedules for the engine and vehicle and it devalues the vehicle. It is particularly odd as I am running 235/85 R16 tyres which I am sure have a larger diameter than the originals would have.

Can anyone enlighten me as to what might be causing this? If I went to an autoelectrician would they be able to fix it or would I be able to fix it myself (I have relatively little knowledge of electronics)?

In case it is relevant I should mention that the speedo is conservative by about 5km/hour.


Thanks all
Click to expand...

What size wheels and tyres are you running?
 
-Defender110- said:
its mechanically run so an auto electrician is no good to 'fix' it.

its supposed to read that you are going faster than you actually are, so you dont speed :)
Click to expand...

Is the speedo linked to the odometer? If it was meant to read 5km'h too fast and it the two were linked then you would expect that there would be no problem wiith the odometer as it would be calibrated to take this into account.
 
Standard on old Ninety's was 205/16 I believe, which is a significantly smaller diameter than any 235 85 R16 you will find. I do not think my larger than stock tyres are the cause of the problem to be honest. They should cause the odometer to go up too slowly if anything.
 
Landyjd said:
Yes, posted the same thing (above) at the same time as you :)
Click to expand...

I believe that you can change the gearbox speedo drive to adjust the speed to compensate for different tyre sizes or diff ratios. I haven't ever had the need to do this myself but it may hold the solution for you.
 
My 110 on BFG AT 235/85-16 is around about 10% ish over on the speedo, I've never worried about it though, I know it does it, so its easy enough to work out my actual speed. Probably not a great deal of help, but I don't think they are ever totally accurate, tiz a Landy after all:rolleyes::rolleyes:
 
I will try and do some more accurate testing with the trip meter on my Ninety to see if I can get a more exact percentage of how far out the odometer is.

I forgot to mention earlier that my speedo ticks back and forth with the ticking motion getting smaller and faster as the speed rises. Could be related - I don't know. Any idea what causes this? Is the speedo run off a cable on old Nineties - if so could the cable have stretched?
 
Landyjd said:
I will try and do some more accurate testing with the trip meter on my Ninety to see if I can get a more exact percentage of how far out the odometer is.

I forgot to mention earlier that my speedo ticks back and forth with the ticking motion getting smaller and faster as the speed rises. Could be related - I don't know. Any idea what causes this? Is the speedo run off a cable on old Nineties - if so could the cable have stretched?
Click to expand...

It is a cable, don't know about it stretching though:confused::confused: When I first got my Landy I think I asked something similar, about the speedo over-reading, and basically got told "Ye, its a Landy, they do that". Never really thought about it since to be honest;);):D:D
 
Cable being kinked too tight can cause the 'pulsing needle' you describe - check it's routed as straight as it can be
 
Landyjd said:
Is the speedo linked to the odometer? If it was meant to read 5km'h too fast and it the two were linked then you would expect that there would be no problem wiith the odometer as it would be calibrated to take this into account.
Click to expand...

The odometer clocks the same as the speedo.

Mine is 10% fast so reads 44mph when road speed is 40mph, my total mileage is also 10% out so my 30mpg is actually 27mpg.

Most cars show 5 to 10% fast and always have done, BMW are more accurate I have found. I followed a small car with a digital speed read out in the middle of the dash last night and his was showing 30mph when I was showing just over 25 so his was miles out.
 
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