NeilP
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 posted on 10/10/08 at 11:37 PM |
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Speedo conversion - Thoughts on best option please
Ok chaps and chapesses,
Mate is changing out his gearbox which is currently a cable drive to the speedo and the new one either has no sensor or not one he thinks he can use.
He doesn't want to change instruments so I see two choices: Find a gismo that can connect to the end of the cable to mimic the cable drive from
a new electric pickup (can't recall ever seeing or hearing of such a creature). Or tear the dash apart (this isn't a locost!) and get an
electronic speedo fitted (possibly getting it converted to either use the existing dial fascia or have a reproduction made) which doesn't sound
easy/cheap either.
Thoughts? Any other options? (sensible now folks 
Thanks...
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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dave r
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| posted on 11/10/08 at 06:16 AM |
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my koso dash is being fed with a signal from the back end of the old sierra speedo still attached to the cable
there is a magnet there ready for you , and in my case a suitable bracket to mount the koso sensor
took a bit of trail and error to work out the speedo calibration, but works ok
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NeilP
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| posted on 11/10/08 at 10:44 AM |
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He won't have the cable but he still wants the old cable speedo so if's there's a way of doing that in reverse then top banana!
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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rusty nuts
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| posted on 11/10/08 at 11:18 AM |
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What gearbox is he using?
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NeilP
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| posted on 11/10/08 at 12:49 PM |
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Think it might be a 6 speed from a volkswagen Mel (poss diesel van which is apparently bombproof - he's running north of 500 bhp!). I
didn't get long to speak to him so that may be wrong - He's got a old T5 in at the moment
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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Blue Fox
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| posted on 11/10/08 at 07:18 PM |
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Would it be possible to use a sensor on the prop through some electronics to turn a small stepper motor which would act as the cable from the original
box
Race Your Fears, Live Your Dreams
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PeterW
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| posted on 11/10/08 at 07:25 PM |
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You can do this with a stepper motor and a bit of electrickery.
Needs a simple circuit (Like this one) and a cheap stepper motor to connect to it. A bit of
guesstimation is needed to work out the RPM of the speedo drive in the first place, but these circuits are pretty adjustable.
Provide a pulse with a hall effect sensor and it should be easy enough to get this working.
Cheers
Peter
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NeilP
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| posted on 11/10/08 at 08:56 PM |
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As usual LCB provides the answers! Thanks guys...
If you pay peanuts...
Mentale, yar? Yar, mentale!
Drive it like you stole it!
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