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Jun 14th, 2026
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Joined: Nov 2009
Posts: 141 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Nov 2009
Posts: 141 Likes: 2 |
Having had similar experience to PJC with my S1's speedo I resorted to a hairdrier to get the LCD screen working again (typical Morgan in the winter experience). Afterwards found my speedo was overreading. I have today after reading posts from 10 years ago recalibrated my speedo which at 60 was reading 48 (now shows 58 when my Google Maps on my phone shows 60). Originally posted by Philippo "Basically I measured the car speedo indicated speed against a couple of satnav devices. Then I entered into the speedo calibration mode, done by holding done odometer reset button then turning ignition on. Basically I then increased the speedo pulse number by close to the percentage of the over read. After a bit of trial and error I arrived at a speedo that reads roughly 1% fast, as opposed to 10% before. The final number of pulses can be + or - a bit since you're looking at a high number."
I have set mine at 46000 pulses which seems to work fine now so great result and demonstrates some really good advice on here.
AnDrew G
2003 Aero S1 - past
2009 Aeromax - past
2012 +4 Supersport - past
2008 Aero S4 -past
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Joined: Jun 2015
Posts: 2,096 Likes: 75
Talk Morgan Expert
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Talk Morgan Expert
Joined: Jun 2015
Posts: 2,096 Likes: 75 |
In order to avoid breaking speed limits, do we not require the speedo to read higher than actual speed? In the case mentioned above, when google maps show 60, you really need the speedo to be 60+. Having said that, you also go on to say you have set it up with speedo reading fast, so I am a bit confused!
Doug
2011 Plus 4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
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Joined: Jan 2008
Posts: 119 Likes: 7
L - Learner Plates On
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L - Learner Plates On
Joined: Jan 2008
Posts: 119 Likes: 7 |
In order to avoid breaking speed limits, do we not require the speedo to read higher than actual speed? In the case mentioned above, when google maps show 60, you really need the speedo to be 60+. Having said that, you also go on to say you have set it up with speedo reading fast, so I am a bit confused! Legally a speedo should read between 0% and 10% over, not under (so you’re never going faster than you think you are).
Current - 2013 Plus 8
Previous - 2002 Aero 8 S1, chassis number 96 - Ragusa Green Metallic
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Joined: Nov 2009
Posts: 141 Likes: 2
L - Learner Plates On
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L - Learner Plates On
Joined: Nov 2009
Posts: 141 Likes: 2 |
Having had similar experience to PJC with my S1's speedo I resorted to a hairdrier to get the LCD screen working again (typical Morgan in the winter experience). Afterwards found my speedo was overreading. I have today after reading posts from 10 years ago recalibrated my speedo which at 60 was reading 48 (now shows 58 when my Google Maps on my phone shows 60). Originally posted by Philippo "Basically I measured the car speedo indicated speed against a couple of satnav devices. Then I entered into the speedo calibration mode, done by holding done odometer reset button then turning ignition on. Basically I then increased the speedo pulse number by close to the percentage of the over read. After a bit of trial and error I arrived at a speedo that reads roughly 1% fast, as opposed to 10% before. The final number of pulses can be + or - a bit since you're looking at a high number."
I have set mine at 46000 pulses which seems to work fine now so great result and demonstrates some really good advice on here.
 Got above wrong way round, for clarity when speedo says 60 google maps say 58 (wouldn't make sense to set it up the other way round 
AnDrew G
2003 Aero S1 - past
2009 Aeromax - past
2012 +4 Supersport - past
2008 Aero S4 -past
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