5 replies to this topic

[Peter_NottinghamS]

The reason I ask the question is that I'm on my second speedo cable as the first one snapped and both are/were way out.

 

How do I know?

I use a speedo app on an old phone and it [the app] appears to be consistent with the flashing road speed checks, so I know I'm okay.

 

When I'm travelling, say at 25mph, in a 30-zone, the app and road side flashing boards shows 25mph and the speedo shows 20-ish.

 

Two factors to consider.  The Mini is fitted with 12x5in JBW replica Dunlop D1's with wide Yoko A539 tyres and the speedo cable has to negotiate the MED sub-stack filter so doesn't get a straight run to the back of the speedo.

 

I'm happy with this solution as I know I'm legal and safe, but is there anything I can do to improve the accuracy of the analogue speedo?

Thanks in advance.

 

Peter 

 

[bangermadness08]

Thought it was a mini thing. My seiko clock needle bounces around more times than a kid on a bouncy castle full of E numbers. Mine will usually show 4mph more than my initial speed that’s on Google maps & speed check road side.

[Mr Piggy]

The speedo cable won't make any difference to the accuracy of the speedo. You'll need to change the ratio in the gearbox. There are charts on here that will help you or talk to a well known parts supplier for advice on what you need to change the ratio.

[DeadSquare]

I don't need to have mine tested. it's Dead Accurate *

 

Why ?.  Because it was made by Smiths in Gt  Britain.

 

It came from the Centre Binnacle of a 140 MPH Cooper S.

 

 

 

 

 

 

*When I'm stationary.

[absx2]

Mine is bang on thanks to Guessworks speedo ratio calculator.

 

Oddly in an ideal world it should be doing 27 mph at an indicated 30 mph just like every modern car so that way there is less chance of being caught speeding.

 

I have to remember that when going through the countless average speed cameras

[mbolt998]

Mine is very good. I've calibrated it against those roadside matrix display things that show your speed. It reads a bit over but not much (which is what car speedos typically do).