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Speedometer Falls to 0 above ~80mph


robsandbach

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Hello everyone,

I wondered if more experienced members could help me triage this issue based on the following symptoms:

- Speedometer is calibrated well and works as expected up to around 80mph

- At, and above, 80mph the needle falls to 0.

- When speeds return below 80mph the needle kicks back into life and reads accurately again.

I'm completely new to this side of car ownership so even some basic areas to look at or tests to run would be much appreciated!

Thanks,

Rob

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Happened to me all most exactly - first time the sensor was faulty & changed out + earthing mod fitted. Second time adjusted new sensor - all OK.

Before you adjust the sensor clean the exciter ring teeth with a tooth brush & WD40. Helps.

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Being a 2019 car it should be a new style sensor (not show in even the latest release of the build manual last week).  This new sensor likes to sit a bit closer to the trigger wheel than the older sensor. 

As already advised I bet this can be solved with a combination of cleaning, gap setting and earth moding. 

If it fails at 80mph its possible that its always been like that, its only tested up to 70 mph during the IVA test, and most onboard footage I have seen from academy races have the speedo disconnected. 

If it helps this is the new sensor and earth mod fitting 

https://caterham420detailedbuildblog.co.uk/2020/01/25/speed-sensor/

and this is how I tested it 

https://caterham420detailedbuildblog.co.uk/2020/03/12/speed-sensor-testing/

 

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