JNC Posted May 3, 2016 Share Posted May 3, 2016 Last night when pushing the high end of the Speedo the needle was all over the place ! . I have a five speed box , Were the wheels turning to fast for the Speedo ? Does it have an electrical sensor ? . Any ideas Link to comment Share on other sites More sharing options...
Leadership Team Garry7 Posted May 3, 2016 Leadership Team Share Posted May 3, 2016 How the speedo works depends upon the age and configuration of the car.How old is your car?I have lots of experience (not all good) of the rear wheel driven electrical sensor version fitted to the newer cars - mines 2011. Link to comment Share on other sites More sharing options...
JNC Posted May 3, 2016 Author Share Posted May 3, 2016 My car is 2012 Link to comment Share on other sites More sharing options...
ScottR400D Posted May 3, 2016 Share Posted May 3, 2016 When I first pushed my car to higher speeds, around 100mph, the speedo kept dropping out. I moved the transducer a little closer to the segmented disc and it's been fine since. Link to comment Share on other sites More sharing options...
Member Jonathan Kay Posted May 3, 2016 Member Share Posted May 3, 2016 Check that there's a wire coming from the sensor in the gearbox (rather than a wire from a wheel or a mechanical cable coming from the gearbox).For the electronic drive from the gearbox: Have a good look and play with the speedo sensor at the gearbox and the wiring. There's a wiring fix and a Workshop Notice (available from JV). (But I thought that the symptoms were failure and fuse blowing rather than dropping out.)For the electronic drive from near a wheel: There's great advice from JV on getting the clearance right. Same point as ScottR400D's.Jonathan Link to comment Share on other sites More sharing options...
JNC Posted May 3, 2016 Author Share Posted May 3, 2016 Thanks all ! , tonight I removed the sensor at the rear offside wheel cleaned the area and made sure all was ok , I checked the tightness of all the bolts refitted the sensor , found the only earth removed cleaned refitted and tested all seems ok now. I will fit the extra earth when Gary7 sends the CC PDF . Link to comment Share on other sites More sharing options...
JNC Posted May 4, 2016 Author Share Posted May 4, 2016 Thanks Garry7 I have got the CC PDF of wire mods, It looks a very easy job to do. It's a bit worrying that if the sensor fails it blows a fuse and cuts out the engine !!. Thanks again chaps. Link to comment Share on other sites More sharing options...
JNC Posted May 7, 2016 Author Share Posted May 7, 2016 Update !! . Fitted extra earth wire readjust sensor done the light test and road test started off ok then erratic again ! . Today went on a earth hunt following black wires to earthling points clean and retighten them , Found the main earth to the bell housing very loose I thought this is it the cause of the problem NO IT ISN'T . Now what ? Please help. Is it time to buy a new sensor ?. Link to comment Share on other sites More sharing options...
John Vine Posted May 7, 2016 Share Posted May 7, 2016 Rather than buy one (they cost around £70, I believe), is there someone you can borrow one from, a least to run a test?Another possibility is that the speedo itself is faulty. When mine first started playing up, CC were able to lend me one -- it fixed the problem.JV Link to comment Share on other sites More sharing options...
JNC Posted May 7, 2016 Author Share Posted May 7, 2016 John when I did the sensor light test by hand all seems to be ok plenty of flashing if it's to close to the cog the Speedo does not work at all so it suggests the sensor is working ? . So do you think it's the Speedo its self . Link to comment Share on other sites More sharing options...
John Vine Posted May 8, 2016 Share Posted May 8, 2016 When you say "plenty of flashing", did the LED light up for every tooth? Clearly it needs to, but if it does, it suggests the sensor is working ok.James Gibson (ex CC Aftersales Manager) offered to lend me a speedo after I'd reported endless problems with mine (needle dipping to zero whenever I applied the brakes or used the indicators, and stopping working completely after about 50 miles of high-ish speeds). The new speedo worked perfectly, and CC seemed content to let me keep it FOC. All this was some years ago, before I was aware of the official earth mod, so I don't know whether it was entirely the speedo's fault. Late in 2014, I had some chassis repair work done at CC. On the journey home, the speedo was waving about like a semaphore flag. I checked the air gap - 0.5mm. Then I applied the WN572 earth mod and all was back to normal. I can only assume that the chassis repair had affected the speedo circuitry and earthing in some way.So, if you can persuade CC to lend you a speedo, at least you could eliminate one more variable.JV Link to comment Share on other sites More sharing options...
JNC Posted May 9, 2016 Author Share Posted May 9, 2016 John what's the importance of cutting the earth wire and only using the new earth From the sensor ? Link to comment Share on other sites More sharing options...
John Vine Posted May 9, 2016 Share Posted May 9, 2016 The standard sensor earth is via a long loom wire. It was this wire that was believed to be picking up stray electrical interference, which confused the speedo. Earthing the sensor directly to the chassis avoids this.JV Link to comment Share on other sites More sharing options...
Silverback Posted May 9, 2016 Share Posted May 9, 2016 Same here today. Speedo has been rock steady reliable since birth (2014) but today's shakedown at Bedford saw the speedo become erratic above 100mph to then die completely only to live once again on the (admitedly) more sedately run home.Perhaps it was the shock of the sunny weather! Link to comment Share on other sites More sharing options...
JNC Posted May 9, 2016 Author Share Posted May 9, 2016 I spoke to Tony at CC today, I am convinced it's down to the Speedo now but Tony thinks it's more likely to be the sensor ! So I've got one in the post on sale or return ! He wasn't to keen on letting me try a Speedo but I still think that's where the fault lies. I found a thread via Google about a chap who also had the same problems who managed to take the Speedo apart he reported dry solder joints and success after resoldering the joints the main problem was unrolling the bezel without making a mess of it. He reported to return it to the manufacture was about half the price of a new one. Link to comment Share on other sites More sharing options...
tomwood Posted May 9, 2016 Share Posted May 9, 2016 Interesting. My 2013 Supersport has development similar issues after its long winter rest in the garage. Dial wavers around all over the place as it approaches 80. Also been cutting out completely intermittently.John, assuming mines the same, where is the sensor to be found and which rear wheel is it?thanks, Tom Link to comment Share on other sites More sharing options...
tomwood Posted May 9, 2016 Share Posted May 9, 2016 Sorry John, just noticed you said offside wheel. I'll take a look at that.is there any chance I might be able to trouble you for that CC guide you mention?Tom Link to comment Share on other sites More sharing options...
JNC Posted May 9, 2016 Author Share Posted May 9, 2016 Ping me your email and I will send it Link to comment Share on other sites More sharing options...
tomwood Posted May 10, 2016 Share Posted May 10, 2016 Cheers John, got your message, many thanks. Link to comment Share on other sites More sharing options...
JNC Posted May 13, 2016 Author Share Posted May 13, 2016 New sensor fitted lastnight , done the light test and the light is brighter than the original one , I went out for a test drive and all looks good again ! Very steady no flickering . Link to comment Share on other sites More sharing options...
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