Hammerhead
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| posted on 12/10/07 at 10:29 AM |
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Speedo sensor help needed
I have some Stack clocks from a Lotus elise I'd like to fit. The main problem is that I have no idea how to make the speedo work.
I know you can get a sensor like this:
http://www.gprdirect.com/epages/GPRDirect.storefront/470f47270023d7be2719d9c7b805064e/Product/View/TERT005
that can read wheel studs or driveshaft bolts. But how would this calibrate to work the speedo?
The elise uses a trigger wheel bolted to the drveshafts, but I cannot find this available to buy.
Does anyone know how to tackle the problem? Help appreciated 
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gingerprince
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| posted on 12/10/07 at 10:38 AM |
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Isn't that what the Speedo Healer does? IIRC it lets you convert electronic blips at one rate to a different rate to suit your clocks. Might
be trial and error if you don't know the actual ratio but it should do what you want, I think.
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Hammerhead
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| posted on 12/10/07 at 10:51 AM |
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is that what everyone tends to use? great, saves me another headache.
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dan__wright
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| posted on 12/10/07 at 11:05 AM |
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quote:
Originally posted by gingerprince
Might be trial and error if you don't know the actual ratio
there is a calculator on the speedohealer website, put in speed the clocks read and your actual speed and it tells you settings.
FREE THE ROADSTER ONE…!!
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Schrodinger
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| posted on 12/10/07 at 11:06 AM |
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ETB uses a trigger wheel for it's electronic speedo, I had it clamped between the prop and the dif on my Tiger Cat.
Keith
Aviemore
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BenB
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| posted on 12/10/07 at 11:09 AM |
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If you need a trigger wheel that bolts to a Standard Lobro driveshaft let me know I've got a few spare from when I had some laser cut
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Hammerhead
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| posted on 12/10/07 at 11:12 AM |
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quote:
Originally posted by Schrodinger
ETB uses a trigger wheel for it's electronic speedo, I had it clamped between the prop and the dif on my Tiger Cat.
but if the trigger wheel isn't exactly the same as a lotus one, wont I still need a speedo healer?
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nib1980
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| posted on 12/10/07 at 11:18 AM |
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yep but most people use 36-1 tooth, and if not norbert at speedo healer will be able to help you, over 6 nightsd of emails and he got mine working no
bother!
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paulmw
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| posted on 12/10/07 at 11:19 AM |
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Sorry to High Jack your thread.
I have a BEC with a 07 ZX10R, how does the speedo work on the bike and how can you adapt it to the car.
Thanks Paul
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Hammerhead
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| posted on 12/10/07 at 11:29 AM |
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quote:
Originally posted by nib1980
yep but most people use 36-1 tooth, and if not norbert at speedo healer will be able to help you, over 6 nightsd of emails and he got mine working no
bother!
so you recommend a 36-1 trigger wheel, a speedo sensor like the one I posted a link to, and a speedo healer.....and that should do the job? Cool.
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BenB
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| posted on 12/10/07 at 11:47 AM |
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quote:
Originally posted by Hammerhead
quote:
Originally posted by nib1980
yep but most people use 36-1 tooth, and if not norbert at speedo healer will be able to help you, over 6 nightsd of emails and he got mine working no
bother!
so you recommend a 36-1 trigger wheel, a speedo sensor like the one I posted a link to, and a speedo healer.....and that should do the job? Cool.
Bascially yes
Unless you can find the number of teeth that was originally on the lotus. Then you could work out from the tyre size the number of revs per minute to
work out the number of teeth needed at a certain mph then work backwards for your setup (obviously unless you've got the same wheel and tyre
choice as the Lotus you're rolling circumference will be different) and get some laser cut like what I did
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Hammerhead
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| posted on 12/10/07 at 11:52 AM |
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quote:
Originally posted by BenB
quote:
Originally posted by Hammerhead
quote:
Originally posted by nib1980
yep but most people use 36-1 tooth, and if not norbert at speedo healer will be able to help you, over 6 nightsd of emails and he got mine working no
bother!
so you recommend a 36-1 trigger wheel, a speedo sensor like the one I posted a link to, and a speedo healer.....and that should do the job? Cool.
Bascially yes
Unless you can find the number of teeth that was originally on the lotus. Then you could work out from the tyre size the number of revs per minute to
work out the number of teeth needed at a certain mph then work backwards for your setup (obviously unless you've got the same wheel and tyre
choice as the Lotus you're rolling circumference will be different) and get some laser cut like what I did
Is there a online calculator for this or a formula I could use? I know the tyre is 225/45/16 and could get the revs/mph from my lotus maintenance cd.
I guess i'd need the radius of the wheel to be correct too.
Thanks for th eoffer on your trigger wheel by the way. I'll let you know if I need one.
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BenB
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| posted on 12/10/07 at 12:06 PM |
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http://www.carbibles.com/tyre_bible_pg2.html
gives a rolling circumference calculator for various tyre types.
This is how I got my speedo to work anyway- my speedo needed 833Hz @ 100mph. I worked out the rolling circ of my tyres, worked out revolutions per
second etc etc, got to 34 blips per second (hence the number of teeth on the split wheel).
Let me know if you want one I've got 'em stashed away somewhere.
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dan__wright
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| posted on 12/10/07 at 12:08 PM |
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quote:
Originally posted by paulmw
Sorry to High Jack your thread.
I have a BEC with a 07 ZX10R, how does the speedo work on the bike and how can you adapt it to the car.
Thanks Paul
is a sensor in the engine, it over read by a very large amount (70 will be about 170 lol) so you need to get a speedo healer to correct it.
FREE THE ROADSTER ONE…!!
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andrew.carwithen
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| posted on 12/10/07 at 12:30 PM |
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BenB,
If you've got several available, I'm interested in one of your trigger wheels. (I've sent U2U.)
Cheers,
Andy.
On another note:
I'm a little confused.
Why is it recommended that a 36 - 1 toothed wheel is used for speedo sensing?
I understand the need when used in an application such as a megajolt ignition system where crankshaft position is required but why is a position
sensing capability req'd for speedo use?
Andy.
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BenB
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| posted on 12/10/07 at 12:36 PM |
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You don't need a 36-1 wheel for speedo sensing. Infact, the missing tooth might confuse it!!!!!
Edited to say: if your speedo is adjustable you could use pretty much any trigger frequency (with reason). My Racetech speedo had to have exactly
833Hz @ 100mph(!)....
[Edited on 12/10/07 by BenB]
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