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496fe
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« on: February 22, 2010, 11:15:06 AM » |
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What are all you guys with Audi transaxles using for speedometers?
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migwell
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« Reply #1 on: February 22, 2010, 11:42:06 AM » |
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Im using the VDO clocks which run from magnets on the driveshafts, these will work on any transaxle , and are easy to programme
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Mad Mechanics - Custom and Kit Cars Forum
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« Reply #1 on: February 22, 2010, 11:42:06 AM » |
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496fe
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« Reply #2 on: February 22, 2010, 07:00:44 PM » |
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Im using the VDO clocks which run from magnets on the driveshafts, these will work on any transaxle , and are easy to programme
Do you have a part number or a more complete description? |
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jdinner
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« Reply #3 on: February 24, 2010, 04:09:53 AM » |
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I made a small bracket and mounted a GM ABS sensor close to the heads of the axle bolt heads, inboard.
This gives me six pulses per axle revolution. Since the VDO head unit is programmable I can fine tune the head to be perfect.
The sensor was one that came with the S-10 wheel bearing I used on the rear drive. The bearing is from a 2001 S-10 pick up 4X4 Front Bearing.
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migwell
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« Reply #4 on: February 24, 2010, 04:22:40 AM » |
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The speedo pick up I use with VDO clocks is from Demon Tweeks, can get the part number if you need it.
Just make a small bracket to hold the pick up which will sit close to the magnets, mine was just a small strip of metal screwed to the gearbox, then you bond either 3 or 4 magnets supplied in the kit to the driveshaft,(mine has 4 magnets bonded to the 1st part of the shaft coming out of the gearbox)
(I would suggest using shielded wire from the pickup as I found mine was picking up other magnetic pulses from my wiring loom and giving false readings)
once wired up, Its so easy to program, and there are various ways of doing this, I just drove mine on the motorway with satnav and set the current speed, past the vehicle inspection no problem.
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496fe
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« Reply #5 on: February 24, 2010, 08:31:44 AM » |
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Thanks for the tips. I am using Corvette C4 hubs on the rear. They already come with ABS sensors that "point" at a cogged wheel with what looks like about 60 "teeth".
1) Are these "teeth" magnets?
2) Does this sensor provide the correct signal for the VDO?
3) Is the VDO capable of being programmed for this many teeth? If not, could I knock some of the teeth out and end up with 4 or 6 and make it work?
You guys are providing a great service because the Audi/Corvette combo seems to be getting popular.
Brian
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jdinner
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« Reply #7 on: February 24, 2010, 06:47:57 PM » |
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I tried to set it up with the ABS hub and sensor. It was reading 300MPH with a Snap-On scanner. It has far too many teeth on the ABS wheel. This is why I pointed it towards the axle bolts. No, the teeth are not magnets. Think of the sensor as a magnet on a spring, when it is close to metal it closes the circuit. http://www.egauges.com/pdf/vdo/0-515-012-051.pdfLook at connection #2 on page 2. This is how to wire it. |
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chimaera
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« Reply #8 on: February 24, 2010, 07:19:22 PM » |
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I'm not sure abou the 016 (Audi 5000) trans, but my 012 and couple others that I had seen already have speedo signal ouing out from them and they are generaly .52 in ratio.
Stupid question but why reinvent the wheel if its already provided
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jdinner
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« Reply #9 on: February 24, 2010, 08:09:47 PM » |
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I'm not sure abou the 016 (Audi 5000) trans, but my 012 and couple others that I had seen already have speedo signal ouing out from them and they are generaly .52 in ratio.
Stupid question but why reinvent the wheel if its already provided
Because the electronic adapter is about $125.00. An ABS sensor can be had for nothing if you are building a replica chassis. |
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496fe
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« Reply #10 on: February 24, 2010, 08:19:50 PM » |
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I made a small bracket and mounted a GM ABS sensor close to the heads of the axle bolt heads, inboard.
This gives me six pulses per axle revolution. Since the VDO head unit is programmable I can fine tune the head to be perfect.
The sensor was one that came with the S-10 wheel bearing I used on the rear drive. The bearing is from a 2001 S-10 pick up 4X4 Front Bearing.
So Jim... all I have to do is take the ABS sensor out of the hub and aim it at the driveaxle bolts? Is there a test I can do with my multimeter to see if it is working? |
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« Last Edit: February 24, 2010, 08:22:54 PM by 496fe »
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jdinner
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« Reply #11 on: February 25, 2010, 04:10:32 AM » |
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I never tried it with a multimeter. I just used the speedo head as my tester. Here is my initial mock up.  |
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cliffscustomfab
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Posts: 188
cliffscustomfab
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« Reply #12 on: February 25, 2010, 09:41:51 AM » |
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oh great more wiring, another way for me to burn down my own build  |
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Mad Mechanics - Custom and Kit Cars Forum
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