Speedos out

winchman · Post by **winchman** » Thu Feb 02, 2012 10:59 pm

No we arnt going swimming.
Mine shows 30 MPH at 38, 85 at 70MPH so its a mile out any ideas?
It has a MPH face.
Wheels are 15"

wonkanoby · Post by **wonkanoby** » Fri Feb 03, 2012 9:16 am

with what size tyres

there is a calculator in a thread some were to original overall wheel/tyre diameter

winchman · Post by **winchman** » Fri Feb 03, 2012 9:31 am

Its got 195/65/15 on it

wonkanoby · Post by **wonkanoby** » Fri Feb 03, 2012 9:38 am

http://www.tyresave.co.uk/tyresize.html

put whats on plate inside door as original

and what you have now

im guessing what you have are a bit small

wonkanoby · Post by **wonkanoby** » Fri Feb 03, 2012 9:39 am

or the face plate they used is not the right one to convert to mph

New Forest Terrier · Post by **New Forest Terrier** » Fri Feb 03, 2012 2:50 pm

I got similar results when an auto electrician fitted my new GAR mph speedo without removing the chip that had been fitted for the kph speedo. This was immediately obvious, as the new speedo was reading under speed just like yours.

Could be a new face fitted on a already chipped original kph speedo?

Darkstar · Post by **Darkstar** » Sat Feb 04, 2012 7:56 pm

winchman wrote:No we arnt going swimming.
Mine shows 30 MPH at 38, 85 at 70MPH so its a mile out any ideas?
It has a MPH face.
Wheels are 15"

just to clarify, are you saying at lower speed it reads over the recorded speed and at faster speeds under??

if its just a typo and your in fact reading higher or lower than recorded speed, your speedo needle may need repositioning.

i initially did this at home with dash binacle removed, carefully pop off the needle " i used to teaspoons to gently level, (mind you dont loose the counter balance wieghts, if the needle cap comes off),

with ingition on, lightly replace the needle on the pin (now this is where there may be some comments from others) i replaced it just below the stop pin on the gauge and gentle lifted over to the correct side of the pin.

with the binacle still off take it for a drive ( with a satnav for speed reference) over various speeds, i believe that most speedos read under the stated speed by a couple of mph to allow for errors.

if you are still getting under or over reading re position you needle again with the binicle off you can do it a layby best to try and get it to just under the recorded speed. mine reads about 2 mph over the actual speed better sfe that sorry

winchman · Post by **winchman** » Sat Feb 04, 2012 8:31 pm

Sorry my poor wording
When I travel at 70mph Speedo reads 85
30 38
Tyres are 195/65/15 all round
It has an MPH speedo buy Odometer is still in KMH

Darkstar · Post by **Darkstar** » Sat Feb 04, 2012 8:45 pm

sounds like you need to pop your needle off and reposition

winchman · Post by **winchman** » Sat Feb 04, 2012 9:09 pm

Darkstar wrote:sounds like you need to pop your needle off and reposition

Ill get me spoons out LOL
How do I take the glass off?

jaylee · Post by **jaylee** » Sat Feb 04, 2012 9:17 pm

Actually four screws fer this.... 55-410. http://lushprojects.com/bongopartsmk2/c ... mgno=.html
Drop the steering wheel & remove the top part of the cowl..

The glass unclips.. http://lushprojects.com/bongopartsmk2/c ... mgno=.html

maxheadroom · Post by **maxheadroom** » Sat Feb 04, 2012 9:20 pm

this may help

http://www.igmaynard.co.uk/bongo/forum/ ... it=top+tip

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