speedo conversion
Discussion
I am planning on building a new diff from an lsd and an open diff to have a desirable ratio with the lsd in the centre. There is obviously the issue of altering the speedo.
Has anyone out there done similar and then been able to use an electic speedo connected to some sierra dials. Not sure if this is possible without homemade mods of some sort but would be interested in doing so.
Has anyone out there done similar and then been able to use an electic speedo connected to some sierra dials. Not sure if this is possible without homemade mods of some sort but would be interested in doing so.
Speedy Cables www.speedycables.co.uk/ should be able to recalibrate your existing speedo 
My car (a Marlin Roadster) used to have a 1300 rear axle from a Marina but was changed for a 1800 (it's an 1800 engine and 'box) to give it lower revs at motorway speeds.
At the moment the speedo under-reads by a bit but I learnt to cope with it as next year I'm half planning either a Stage2 & type9 'box or maybe something really silly in converting the whole shabang to run a V8
.
Anyway, when I was asking about I was told I needed to:
1) Mark out 52.5ft on a flat road (i.e. 1/10 of a mile)
2) Take the speedo off, and put a bit of tape on the cable end (i.e. on the spinning bit)
3) push the car over said distance counting number of rotations (including fraction of rotation)
4) multiply the number by 10 to get turns-per-mile. If this number is something like 1024, 1030 or similar you can simply buy a new speedo or get your old one re-configured
The original post is in Kit-Car forum somewhere if you do a search...
At the moment the speedo under-reads by a bit but I learnt to cope with it as next year I'm half planning either a Stage2 & type9 'box or maybe something really silly in converting the whole shabang to run a V8
. Anyway, when I was asking about I was told I needed to:
1) Mark out 52.5ft on a flat road (i.e. 1/10 of a mile)
2) Take the speedo off, and put a bit of tape on the cable end (i.e. on the spinning bit)
3) push the car over said distance counting number of rotations (including fraction of rotation)
4) multiply the number by 10 to get turns-per-mile. If this number is something like 1024, 1030 or similar you can simply buy a new speedo or get your old one re-configured
The original post is in Kit-Car forum somewhere if you do a search...
suggestion I got was it is around £100 hence not wanting to do it twice.
It was also suggested that it takes some time for the speedo to be returned from the link given, however that is hear-say, rumour, gossip... what ever you call it.
>> Edited by docevi1 on Sunday 5th December 16:07
It was also suggested that it takes some time for the speedo to be returned from the link given, however that is hear-say, rumour, gossip... what ever you call it.
>> Edited by docevi1 on Sunday 5th December 16:07
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