Tacho gremlins

Clive

Clive

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On my last track day with my 2017 CR I noticed that my tacho seems to lose the plot a bit over 4-5000rpm and waves around up to 9000. At lower revs it seems fine - anyone else seen any strange behaviour on theirs or looked at the signal going to it or had it in bits? It doesn't seem to be sticking; the movement is smooth, just a bit random. Need to get a scope and sig gen on it to work out whether its the clock or the signal being fed to it.
 
I think somebody on FB mentioned the same issue. Is it possibly just the needle loose on the spindle?
 
Don't think so as it works fine on lower rpms and returns to zero. Not sure how it works - is it conventional meter type movement or stepper motor or something else?
 
Clive said:
Don't think so as it works fine on lower rpms and returns to zero. Not sure how it works - is it conventional meter type movement or stepper motor or something else?
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Had similar gremlins on my 2015SF including random acquisition and loss of miles on the odo. Replacement unit cured all. Others have chosen to live with it. Unsure of the spares situation until the factory stick their heads above the parapet but I believe it is a vdo product so maybe able to aquire from source. Oh the joys of ownership!
 
StuartSF2015 said:
Had similar gremlins on my 2015SF including random acquisition and loss of miles on the odo. Replacement unit cured all. Others have chosen to live with it. Unsure of the spares situation until the factory stick their heads above the parapet but I believe it is a vdo product so maybe able to aquire from source. Oh the joys of ownership!
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Don't like to think how much that would be. Would probably consider either an add-on tacho or replace the innards. VDO should be a good quality unit assuming it is genuine VDO....
 
Clive said:
Don't like to think how much that would be. Would probably consider either an add-on tacho or replace the innards. VDO should be a good quality unit assuming it is genuine VDO....
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The clocks are VDO and Continental in Birmingham supplied them to Norton. At the time Norton went into admin. Continental could supply the tacho for £105, speedo for £140 but now that TVS have taken over apparently Continental are no longer 'able' to supply direct.... it would appear that TVS are starting to pull the strings again.
 
Mine has problems sits on 1000 while turned off seems to be about that all the way, but I did talk to someone that had a similar problem and the said they pulled all the connections off cleaned them up and it came good, so I'll be doing that shortly and see how it goes
 
Fast Eddie said:
Who needs a tacho?

Hold WOT… hit rev limiter… change gear… repeat.

Simples.
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There’s a rev limiter!!? :oops:

I’ve had a few oddities occur with my clocks. From memory, they seemed to have been initated by my having the audacity to use the selector button. Manipulating/massaging the selector button fixed it at one stage.
 
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