How have you guys got around using bike clocks with car setup? I assume the speedo would be ridiculously out!!

Are most bike speedos adjustable?

We use a thing called a speedo healer

go to speedo healer s webby http://www.speedohealer.com/ and all is explained.

After 2 years lurcking and learning a lot I've decided to try a post as an oldy I can't be sure what's going to happen.My car is nearly finished so thought may be able to repay help I got from this site.My car is a bit odd by UK standards,G15 efi mitsubishi engine 5 sp Lancer RWD gearbox,Nissan GTIR Irs diff Cortina TF front hub assys.Using rwd gearbox with fwd transducer moded to fit & Mitsi clocks will present a problem on speedo accuracy I have discovered a fix that may help a few people have,nt bought one of these yet as I have,nt tested the car but I doubt I'll fluke it correct on testing.After all that,if you are still awake "Jaycar.com.au" have a kit made by Silicon Chip to correct 2 wire & 3 wire speedos $A45 very cheap in Sterling,been in contact with Silicon Engineers --very helpfull .There is a Jaycar near me here in Sth Queensland but there are branches over Australia .Can't guarantee them they were released in Dec 04 so only know what I have stated Thanks to everyone

Take it this is the goody Works out cheaper Aus$ to GB£

Cheers fellas - what about a mechanical Speedo (as available on older bikes)?

If its driven off the engine / gearbox casing somewhere Id imagine there's not a lot you can do with a mechanical speedometer short of getting it properly recalibrated or printing out an alternative set of dials for it which do read correctly when overlaid on the original dial face.

For the electronic versions a Yellowbox is the original gizmo which I have used succesfully, but you can only get them directly from Black Robotics in Australia, and they work out a bit more expensive than the Speedohealer which wasnt available when I built mine.

[Edited on 28/1/05 by ChrisGamlin]

Bear in mind also, that a Speedohealer has a much greater range of error correction (around 99% IIRC) whereas, the Yellowbox is about 40%.

Speedohealer is also slightly cheaper.

if i wanted to print a new face for my speedo, how do you ensure its accuracy, ie how do you know your doing 30 and not 32, 33 or 34 miles an hour?

All you can do is work out from your current speedo what speed you are actually doing, (eg 50 on speedo = 30 real speed etc) then extrapolate out from that. You know the distance between 0 and 50mph on the speedo = 30mph, so you make up a new background that has 30mph shown where 50 currently is, then in theory the same distance again should be 60 etc etc. Didnt say it would be hyper accurate but probably within the normal % error of a regular speedo.

Chris

I seem to remember a while ago reading an ad for a company that makes up mechanical speedo cables to suit kit cars. you tell them the rolling circumference of your tyres (by chalking the tyre and the road and rolling it by one rev) and some other information (prob about the speedo) and they would make you a cable with a right angle gear drive of the right ratio to sort out your car. don't know who it was but they might advertise in a kit car magazine or attend a show.