Speedometer upgrade, No more broken cables or angle drives |
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Speedometer upgrade, No more broken cables or angle drives |
ClayPerrine |
Feb 12 2014, 02:47 PM
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#1
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Life's been good to me so far..... Group: Admin Posts: 15,901 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
I found something online that I wanted to try:
I bought one and wired it to my factory 911 speedometer. I wired it like this: The white wires are from a 12v DC transformer, used to bench test it. The Positive is on the left, and the negative is on the right. The Autometer module is wired to the same positive and negative lugs, and the purple wire from the Autometer is connected to the speedo input. The other speedo input is jumped to ground. Running the calibration procedure in a bench test, found here , I was able to get the speedo to read exactly 80 mph, and the odometer was working too. The next step is to test it in a vehicle. The heavy wires from the positive and negative go to an old cigarette lighter plug that I will use to test it in my truck, comparing the output with the truck's speedo, and my android app "gps speedometer". If everything works as I expect, I can remove the speedo cable and angle drive from my car. I will probably plug the speedo output in the gearbox to prevent any gear oil leaks. I will update this when I run the second test. I will keep you updated on the results. |
ClayPerrine |
Mar 4 2014, 05:26 PM
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#2
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Life's been good to me so far..... Group: Admin Posts: 15,901 Joined: 11-September 03 From: Hurst, TX. Member No.: 1,143 Region Association: NineFourteenerVille |
Just an update on this project.
I got it all hooked up and in the car. I had to move the antenna to the top of the windshield hoop, but otherwise it works great. It took some time to get the calibration right, and now both the speedometer and the odometer are accurate. The speedometer is calibrated to within 1mph of the cable driven speedometer, and both of them are accurate when compared to the GPS speedometer app on my phone. The update rate is so good that the needles on both speedometers move in synchronization when accelerating and decelerating. The only thing left is to remove the speedometer cable, the angle drive, and the speedometer drive in the transmission. I am going to put a plug in place of the drive so there will be no more oil leaks. Now the weather needs to warm up a bit. |
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