p.mole1 Posted March 15, 2019 Share Posted March 15, 2019 Can you alter the speedo drive ratio's in the gearbox and if so can you get to them with the gearbox in the car?.I have changed the diff ratio from 3.9 to 3.6 and it is a huge improvement with the 1.8 engine and a six speed box. I think the original diff gave around 16 mph per 1000 rpm and now its 18 mph per 1000 rpm with 14" inch wheels. These figures are from the Caterham manual so I don't know how accurate they are. It now looks like my speedo is under reading by at least 10% Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 15, 2019 Share Posted March 15, 2019 I posted a while ago about swapping the speedo drive on a 6sp whilst the box is in the car.Just search the archives.Ian Link to comment Share on other sites More sharing options...
p.mole1 Posted March 15, 2019 Author Share Posted March 15, 2019 Thanks I need to see if different drive ratio's are available. I can remember correcting a Mini speedo in the past by changing the drive ratio Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 15, 2019 Share Posted March 15, 2019 When I did mine I found a company on ebay that made billet ally drives for the type 9 which is the same as the 6sp. Ford ones are quite rare! I have a 6sp / 3.62 and the speedo reads spot on . I’ll dig out the old drive and count rhe teeth (changed as leaked oil via rhe ferrule)Ian Link to comment Share on other sites More sharing options...
p.mole1 Posted March 16, 2019 Author Share Posted March 16, 2019 Thanks Ian Link to comment Share on other sites More sharing options...
p.mole1 Posted March 16, 2019 Author Share Posted March 16, 2019 Hi Ian found the article but appears MKF engineering are no more! I think they may have been parts for other items rather than gearboxes Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 16, 2019 Share Posted March 16, 2019 Quick google found the National Crime Agency story :-0Ian Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 16, 2019 Share Posted March 16, 2019 Black, 24 teeth. Link to comment Share on other sites More sharing options...
Alastair B Posted March 17, 2019 Share Posted March 17, 2019 Black 24 tooth speedo drive has the ford FINIS code of 6011058, this is correct for a 5 speed gearbox, presuming it is the same part in a 6-speed then that might help you search the internet, but could be difficult to get this part. Another option is to get your speedo re-calibrated at JDO Instruments if you have an analogue speedo. Probably cost about the £120 mark. Link to comment Share on other sites More sharing options...
Wrightpayne Posted March 17, 2019 Share Posted March 17, 2019 Just to add I run 185/60R13s tyres.RegardsIan Link to comment Share on other sites More sharing options...
blueyedbiker Posted March 19, 2019 Share Posted March 19, 2019 Speedograph Richfield will recalibrate for about £75, easy enough to do, measure the number of turns the drive does for 6 wheel rotations, there's a form on their website. http://www.speedograph-richfield.com/ Link to comment Share on other sites More sharing options...
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