Speedo Wrong?

[CTI STU 0]

Ive just got my self another Cti and the speedo seems to be wrong? @ 50mph mine is showing 61mph and at 90mph mine shows about 107mph!!!

 

The car is a 1.6 but Ive been told it has 1.9 hubs on it so has 1.9 drive shafts? could this have anything to do with it??

 

Please help!

[welshpug 1,666]

Check what tyres it has fitted.

[steve@cornwall 100]

Ive just got my self another Cti and the speedo seems to be wrong? @ 50mph mine is showing 61mph and at 90mph mine shows about 107mph!!!

 

The car is a 1.6 but Ive been told it has 1.9 hubs on it so has 1.9 drive shafts? could this have anything to do with it??

 

Please help!

 

will help to say what size wheels and tyres are fitted - makes a difference

[Richie-Van-GTi 74 2 Cars]

if its standard size tyres and wheels then maybe it has the wrong drivewhel in the gearbox, what box is it?

[Henry Yorke 269 3 Cars]

You need to make sure that the toothed wheel on the end of the driveshaft is the correct one for the speedo worm. Changing the worm only doesn't seem to work.

[jeremy 71]

If you have standard 1.9 wheels on a 1.6 it will make about very little difference on the speedo. Only the other day on my private runway my 1.6 with 1.9 wheels was saying 98mph on the clock, yet the Sat Nav registered 100mph

[sutol 0]

Sound like the speedo thinks that it it is geared as a 1.9 but it is actually geared as a 1.6 so as Henry says, I would look at the speedo drive bits.

[welshpug 1,666]

Sound like the speedo thinks that it it is geared as a 1.9 but it is actually geared as a 1.6 so as Henry says, I would look at the speedo drive bits.

 

 

not at all, the circumference of 1.6 and 1.9 tyres are near identical (1% difference in fact)

 

what was the gearbox off originally? by bet is that its something with a 195 55 15 standard tyre size.