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914World.com _ 914World Garage _ Anyone design a toner wheel...

Posted by: neo914-6 Feb 20 2006, 10:12 PM

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.

Posted by: jonwatts Feb 20 2006, 11:42 PM

What gearbox are you using again?

It's probably in your sig. I'm probably lazy.

Posted by: jonwatts Feb 20 2006, 11:44 PM

Oh yeah, boxster.

What does the boxster use for VSS and how do they mount it?

Posted by: McMark Feb 21 2006, 01:11 AM

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.

Posted by: 914efi Feb 21 2006, 07:16 AM

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.

Posted by: 914efi Feb 21 2006, 07:16 AM

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.

Posted by: lapuwali Feb 21 2006, 09:46 AM

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.

Posted by: Dr Evil Feb 21 2006, 10:08 AM

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.

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