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#16 | |
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1. Keep the mechanical speedo cable and isolate the speed output from the stock cluster and use it as a signal source. 2. Hall effect sensor + trigger/magnetic pickup wheel on the driveshaft (there are some pre-made options out there that look like they'll work). 3. Hall effect sensor + trigger/magnetic pickup wheel on a front wheel hub (a la TII ABS sensor) 4. Use FD VSS (will this even work in a N/A transmission?) Thoughts? |
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#17 |
Respecognize!
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you could likely reuse the ABS sensor. It puts out a steady signal. just take it from one of the front hubs (that are equipped)
we used that for some rally computers
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#18 | |
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#19 |
Respecognize!
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probably easier to just replace the hub. GXLs with it are common enough.
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#20 | |
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I did some research on the ABS sensors and it looks like they're variable reluctance (VR, magnetic pickup, passive, etc.) so it's simpler than a Hall effect setup but not as good. Now if only I can find out how many teeth the ring has. |
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#21 |
Rotary Masochist
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I believe there is a shop that makes a Hall effect speedo drive that swaps in the TII trans. Forget the name. Search on the evil forum. It may work in the NA trans.
The FD and Miata trans senders use a VR sensor. If one swaps to the NA trans it would work with an A/D converter. There is nothing really better about a Hall sensor. VR sensors generally are preferred for something like wheelspeed where there is a high resolution target. Just need an A/D converter for your gauge and ECU that want to see a square-wave input.
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#22 | ||
Test Whore - Admin
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#23 | ||
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I forgot all about the A/D converter. The speedometer I have says it can use a signal from either a VR or Hall effect sensor as long as the signal is 3V peak-peak. I'm sure the VR input would be slightly irratic if not wired absolutely perfectly so the A/D converter is probably a good idea nonetheless. Quote:
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#24 | |
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