Hi
Can anyone tell me what is involved to correct a speedo error on a Rover? I'm assuming it once had smaller wheels (now 12" Minilites) thus the percentage error I get. I have tested with other cars to confirm. Is it just a matter of substituting a gear out of manual box which drives the speedo? Can anyone educate me here? easy job? Where to get correct part? etc..

TIA

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i think you have to reclibrate the speedo,, to do this they need to get to the back of the dash and change the gear the cable goes into,,, need to do mine too

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1974 Moke - 998cc
76 Clubman B16a2 Vtec AWD Turbo 12.9@105mph
https://www.youtube.com/watch?v=V9PW49e1hYs

What he said......yes it ain't rocket science...the cable comes out of the gearbox and drives a big spiral of a gear in the speedo...

you can fiddle in there CAREFULLY or you can get a little conversion box do-hickey that connects out of the gearbox....if it is not wildly inaccurate...why not just take it to a measured Kilometre and determine where it is really reading with a stop watch or GPS...note the Tacho reading (if fitted) and you have two points where you can check your speed (you obviously need to do the check at maybe 60 and 100 clicks).

Alternatively, suss out the correct gears for that model and look for a whole instrument or just the gears.

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"Show me the Mini!"

Any reputable automotive technician will be able to do it. They measure the tyre roll out and convert that to tyre rpm per mile (kilometer) and calibrate it off that figure.

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Chris

Everything I like is either
illegal, immoral or fattening.

A cheap and easy way is simplely to put some numbered stickers on the face of the speedo.

You can get a 6mm dia stickers from newsagents 1 to 200 for about 3 bucks.

All you have to do then is drive behind some with a good speedo and note the speeds. You need to work out some signals, or make up some signs or talk to each other over a mobile phone.

The just have a page with a table with, 40, 50, 60, 70, 80, 90

see the table below for my mini matic


Actual Speed Speedo Error (over speed)
KM MPH KM MPH KM MPH
40 25 48 30 8 5
50 31 63 39 13 8
60 37 69 43 9 6
70 43 81 50 11 7
80 50 97 60 17 10
90 56 105 65 15 9
100 62 119 74 19 12
110 68 129 80 19 12



I could send you a photo of the face of the speedo but the mini matic is out at the present.

Hope this helps, it cheap and easy.

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1967 Mini Deluxe 1275 heaps of modifications
1969 Mini Matic 1100

I would not worry about it, except my insurer restricts me to limited kms per year so I've either gotta solve it or start winding clocks back or stop driving as far. I did my calculations and realised I'm gonna be well over my quota at this rate.

I probably wouldn't use stickers, definitly helpful, but it'd end up looking like a respray with a paint brush I'd guess. Terminal velocity is otherwise VERY impressive for a Mini. In a dillusion you may ask who needs engine enhancements for speed!

At first I was suspicious as to why EVERYONE was speeding past me. I confirmed the problem while in convoy with a BINI using our 2-ways. The error is a steady percentage. At 110kms in the Bini I'm reading about 140kms in the Rover. I was hoping that when you changed wheel sizes it was just a matter of substituting a gear at the end for a different ratio.

Can anyone be specific with what to get from whom, is it a Mini part or a generic scrounge for what suits? Being a 94 Rover it's got the 3 guage set. Tacho seems to operate normal (?).

My last thought here is would the operation be easier if I replaced my instruments with ones from a later model? Thinking here that a later model (1998-2000?) was standard with these wheels?

Any comments?

Thanks for help everyone.

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It is a job for an automotive instrument guy. Stickers could be used for correcting the speed readings but they won't have much impact on the odometer readings. It is not a straight forward job of changing gears as they cannot be obtained from spares sources. There are several places in Sydney that can do this work. There is a web site somewhere that explains it all but getting the parts is the problem.

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Chris

Everything I like is either
illegal, immoral or fattening.