Speedo
Turbo Mini Forums

Hi,

My car has an MG metro 1275 engine, I came to fit my speedo but turns out the speedo drive was too small for my cable. So I sized the one up out of my other 1275 unit which was the right fit and swopped this drive into the other engine.

On driving the car, i always thought 30mph seemed to quick for what it was, but put this down to being sat low down and keeping with the same speed as other cars in traffic.

Drove it on the motorway for the first time the other day and its really running out of puff at an indicated "70mph".

I know standard clocks arent NASA precision equipment but could have swopping the drives over fudged the reading? I didnt notice a difference in gear size between the drives when i changed them over?

Hmm, either that or this has confimed what I doubted, my car is a useless nugget of shite!

Cheers

its probably wrong, mine doesnt do more than 55mph


hahahaha that new addition to your sig is hilarious

Yeah haha!

I stole it from someones sig off another forum, made me crack up.


Yeah the speedo has to be out because that "70mph" did feel intergalacticly fast for 70.

Hoping to come to Avon this afternoon!!

Edited by richminiturbo. on 12th Jul, 2008.

Its mainly the steel gear that is wrong, if still the original MG Metro one it will be 5 teeth (Minis are 6 or 7) and one tooth makes a much bigger difference on a 5 tooth gear than on the 16/17/18 toothed plastic one.
There is a table/calculator on one of the other Mini forums that tells you what you want for a given wheel/tyre combination and a given speedo TPM (there are several different speedo TPMs)

Schrödinger's cat - so which one am I ???

There's this one (bottom of page) http://www.minifinity.com/distribution/vie...p?f=206&t=73640 bit complicated as you have to download it and Windows usually wants something downloaded too, but it is very good if you can get it to work.
Otherwise http://www.tomsminisite.co.uk/speedo_calculator.php bit harder as you have to keep trying options until you gt what you want, but still works OK.

Edited by Rod S on 12th Jul, 2008.

Schrödinger's cat - so which one am I ???

Thanks for the links!!

Ive got Nippon Seiki Dials so have entered the TPM's of 1300 and 1242.

According to this calculator I should be getting 70mph at around 4200rpm and 30mph at 1800rpm in 4th gear.

Will wire up my revcounter and see what im getting!

Thanks alot.

Edited by richminiturbo. on 12th Jul, 2008.