 Anyone design a toner wheel..., ...for an electronic speedometer? |
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| neo914-6 |
 Feb 20 2006, 10:12 PM
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#1
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neo life  Group: Members Posts: 5,086 Joined: 16-January 03 From: Willow Glen (San Jose) Member No.: 159  |
For neo914's Audi instrument panel, I need an inductive sensor mounted to the wheel that will have have app.10-12 holes evenly spaced. Every time a hole goes by the sensor, it will deliver a signal to the speedometer.
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| jonwatts |
Feb 20 2006, 11:42 PM
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#2
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no rules, just wrong Group: Benefactors Posts: 2,321 Joined: 13-January 03 From: San Jose, CA Member No.: 141  |
What gearbox are you using again?
It's probably in your sig. I'm probably lazy. |
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| jonwatts |
Feb 20 2006, 11:44 PM
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#3
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no rules, just wrong Group: Benefactors Posts: 2,321 Joined: 13-January 03 From: San Jose, CA Member No.: 141 |
Oh yeah, boxster.
What does the boxster use for VSS and how do they mount it? |
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| McMark |
Feb 21 2006, 01:11 AM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
I'd bet they trigger the speedo off of one of the ABS sensors. Mueller had a design a long time ago for a trigger wheel that mounted on the tranny side of the axle.
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| 914efi |
Feb 21 2006, 07:16 AM
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#5
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Member Group: Members Posts: 140 Joined: 14-June 04 From: Westport,MA Member No.: 2,204 Region Association: None |
I've been looking at these also, but had another idea; GPS speedos. They are available, look on google. They are more expensive, but a pretty cool idea.
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| 914efi |
Feb 21 2006, 07:16 AM
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#6
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Member Group: Members Posts: 140 Joined: 14-June 04 From: Westport,MA Member No.: 2,204 Region Association: None |
I've been looking at these also, but had another idea; GPS speedos. They are available, look on google. They are more expensive, but a pretty cool idea.
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| lapuwali |
Feb 21 2006, 09:46 AM
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#7
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Not another one! Group: Benefactors Posts: 4,526 Joined: 1-March 04 From: San Mateo, CA Member No.: 1,743 |
Felix, the "inductive" sensor is also known as a VR sensor (variable reluctor), and you can get one off a junkyard Ford Escort from the early 90s: the crank sensor for the EDIS ignition. The wheel you use must be made of steel, since these sensors will only "see" a ferrous tooth. You'll need to know the number of teeth exactly, unless the gauge is somehow adjustable.
There are a variety of mounting options. Since you're going to have to have the wheel custom made, anyway, you could have it made as a toothed ring that fits snugly on a CV and is held in place with set screws. The diameter of the wheel won't be important to the sensor, only the number of teeth. The bracket that gets made to hold the sensor will need to be able to hold the air gap between the sensor and the wheel fairly constant, or you'll miss teeth and get an inconsistent signal. |
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| Dr Evil |
Feb 21 2006, 10:08 AM
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#8
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Send me your transmission! Group: Members Posts: 22,995 Joined: 21-November 03 From: Loveland, OH 45140 Member No.: 1,372 Region Association: MidAtlantic Region 
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Here is the one I had modified off of a Ford for my homebuilt EDIS system. I had one914racer modify it for me. Great machinist.
Mueller gave me the wheel, you should talk to him. Attached image(s) 
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