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803 speedometer on 948 diff
Posted: Wed Jul 28, 2021 9:31 pm
by 12jslater
How would I go about correcting my speedometer that now only reads 84% as i have an original 803cc engined car with a 4.55 axle from a 948cc engined car?!
Yes i could ignore it as i know what equates to 30 and 40mph butits very bloody annoying.
Re: 803 speedometer on 948 diff
Posted: Wed Jul 28, 2021 9:43 pm
by jagnut66
Hi,
I have used (and will again) JDO Instruments and am happy to recommend them to recalibrate your speedo.
http://www.jdo1.com/
Best wishes,
Mike.
NB: They also repair car time clocks.
Re: 803 speedometer on 948 diff
Posted: Wed Jul 28, 2021 10:09 pm
by Sleeper
If you post the tpi number on your speedo ( small print on the face ) we can work out what you need..
John ;-)
Re: 803 speedometer on 948 diff
Posted: Thu Jul 29, 2021 12:22 am
by liammonty
It’ll be 1000 tpm in an 803 I think. If it’s an early SII, the only option will to send it for recalibration as already suggested as the only alternative is an MM one which I think is 1600 tpm and will be no good either.
Re: 803 speedometer on 948 diff
Posted: Thu Jul 29, 2021 8:05 am
by ianmack
I have a ‘54 with a 1098 diff and a motorbike with a speedo in kilometres. The mental arithmetic can get very complicated.
Re: 803 speedometer on 948 diff
Posted: Thu Jul 29, 2021 8:59 am
by don58van
Declan Burns (on this site) makes little gearboxes that mount on the back of speedos to make the required correction.
Just another option that I thought you would like to be aware of.
Don