Talk Morgan Forums Morgan Sports Cars Maintenance & Servicing Help needed - Speedometer Calibration

Thanks Jay but I've already read that from Caerbont. Mine does not enter calibration mode as described when pushing the reset button at switch on. And there doesn't seem to be a remote button fitted either.

I don't actually need to recalibrate, was just trying to help someone else with the same car. If I could find a way to read the calibration number from mine it would help.

Nigel

Hi everyone,


I was just catching up on this old post to see if there is anyone out there who has found the correct calibration number for the Caerbont electronic speedo. I am in process to swap my black dials for magnolia. I have a calibration number in the existing speedo of 004268 but I want to check that it is correct as I believe my speedo reads fast by at least 5% and would like it more accurate.

Similar to the earlier post, I understand the components of the calculation as per the Caerbont instructions and have calculated number of wheel turns per mile, I know my Diff ratio but the MT75 gearbox has an electronic sender and I have no idea how many turns per mile the sender has or how many pulses per rev. Therefore; could someone out there please check the calibration number in the speedo of a series 2 Roadster (mine is 2008). You check this by;
Switching on the ignition whilst simultaneously pressing the trip/reset button. The pointer will twitch (or travel full scale-to-zero). The lcd will read SET PPU, press the reset button for three seconds and the current setting will be shown. Switch off or leave it for a few seconds and the speedo reverts to its normal mode.

Many thanks for any wisdom and, if possible, a setting for the Roadster.

Kevin

The calibration figure is the simply number of pulses to give a certain indication. Logic would suggest if you wish your speedo to read say 3% less, the you would need to INCREASE the original calibration factor by 3%? Anybody tried that?

Thanks Doug, I guess i can try that and then revert to current settings if the change doesn't work.