nickm Posted April 16, 2009 Share Posted April 16, 2009 Had a little search but couldnt find anything, Basically my speedo is way out according to my satnav any ideas what I can check/replace according to my speedo top gear kicks in at 60mph satnav reads 48mph is this about right ? 80 on the speedo is around 65 on the satnav Cheers Quote Link to comment Share on other sites More sharing options...
CURLY Posted April 16, 2009 Share Posted April 16, 2009 thats way out! i checked mine with my sat nav and at 80 on the speedo, i was doing 75. round a race track obviously.. can you rotate the center part of the speedo (needle part) if not, you could try putting a new dial in i spose? CURLY Quote Link to comment Share on other sites More sharing options...
Mark Posted April 16, 2009 Share Posted April 16, 2009 What size tyres are you running? and which transfer box? If you do a search on speedo drive gears there are a number of gears available that can be swapped in and may give you a more correct reading. Alternatly, your speed transducer may be knackered, but that is usually indicated by the occasional loss of any speedo reading at all, or erratic readings. Mark Quote Link to comment Share on other sites More sharing options...
nickm Posted April 16, 2009 Author Share Posted April 16, 2009 Hi This is my completely standard road car I did think about the transducer but also thought that that would be more complete loss of speedo also thought about the gear where the speedo cable connects to the t box, Can the gear be replaced easily ? Quote Link to comment Share on other sites More sharing options...
expat69 Posted April 17, 2009 Share Posted April 17, 2009 A standard Disco 300tdi auto speedo is usually reading 6% lower than true speed yours is way off... Quote Link to comment Share on other sites More sharing options...
teabag Posted April 17, 2009 Share Posted April 17, 2009 HiThis is my completely standard road car I did think about the transducer but also thought that that would be more complete loss of speedo also thought about the gear where the speedo cable connects to the t box, Can the gear be replaced easily ? One or the other you don't have both, pre-March 1994 was cable. My SatNav reads 70 but my speedo reads 75. Quote Link to comment Share on other sites More sharing options...
nickm Posted April 18, 2009 Author Share Posted April 18, 2009 One or the other you don't have both, pre-March 1994 was cable.My SatNav reads 70 but my speedo reads 75. sorry forgot to say mines a 1997 would you know when top gear kicks in mines not til 60mph according to the speedo cheers Quote Link to comment Share on other sites More sharing options...
Guest DiscoTD4 Posted April 20, 2009 Share Posted April 20, 2009 Top gear engages at just over 50mph I think from memory on the auto. Quote Link to comment Share on other sites More sharing options...
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