fabricating a VSS?

[dcb]

sweet progress!

that thing that was on 2 must have been the "VSS Delay ms" setting I was referring to in post 33.

[ECONORAM]

Originally Posted by thecheese429

Ah, the joy of DIY. Stuff doesn't work right. Initially, at least.

Took it for a test again, and after pulling over and adjusting, driving, pulling over, etc. The results are this: The pickup either gets the first signal (see above post) reliably, or the second signal intermittently.

This, I have found to be very true. My first try at a DIY VSS signal was to be a high intensity LED, opposite a photosensitive receptor, separated by a tin can lid with holes drilled in it. I could not get the LED to light up, so I subbed in a 12v gauge bulb. However, I could not keep the disk from sliding on the tranny shaft and shaving material off my photo receptor, and riding under the tranny seal. It would give me a pretty good signal, with the gauge bulb, if it was dark out. Sunny days did not work well. I have substituted the metal disk for a cardboard disk covered with clear packing tape, with 4 "teeth" cut into the circumference. Maybe I should have shielded the light better, or cut holes in the disk like I did the metal disk, as I don't think the receptor ever gets the "off" signal. But, it doesn't shave down the receptor or grind my tranny seal anymore. Maybe with a little tweaking.

[usergone]

Today I did some highway driving, and the sensor and guino were both able to keep up with the speed. Thanks, dcb for pointing me in the right direction.

[dwtaylorpdx]

I don't know the years but some vehicles have a inline VSS in the speedo cable from the factory. I seem to recall 80's nissans, GM engines Early Toyota EFI....

My 1994 Jeep wrangler has a AX5 trans and has a vss to trigger the speedo. It fits in the same hole as the speedometer drive gear...

Dave

[dcb]

Yup, lots of folks are getting feedback from their factory VSS's. This is about what to do if you don't have one, or don't want to sort that out (different kinds of vss on different vehicles and different wiring/etc).

[usergone]

Here's a picture of what I did to the driveshaft. The bolt heads are welded on.


You'll notice that the sensor is not mounted yet. That's because I took the picture before I put the mount on

[ECONORAM]

cheese, I did not think of that! I am still monkeying with mine at the moment...but I think I am going to focus on a fuel cut off for now...

[thefenixgang7]

I know this is kind of an old thread, but I'm hoping to get the information I need.
I have installed a mpguino in my 88 Jeep Cherokee 4.0 5 speed, and I am getting the injector signal, but having a hard time getting the proper setting, but this is the first day, so it will probably take a while.
The issue that I am having is that I installed one of those hall sensors, but I am not getting a signal from it, at least the mpguino is showing no change in mph. Currently I am using weights on the drive shaft for the 'lump of metal', but it does not seem to work, I don't know if I wired it wrong, or if the sensor is bad, but I do know that the mpguino shows no change when I wave a piece of metal in front of the sensor.
The way I have it wired is the red wire to 12v, the black/white wire to mpguino, and the black wire to ground.
Hopefully one of you guys may be able to help me.
Thanks in advance

[usergone]

First off, if I understand correctly, it will only respond to ferrous materials. Also, I had to get the metal very close to register a change. It had a 12v output when it was alone, and a 0v output when there was a piece of ferrous metal close. It had to be very close, as in 3/32" close.

Also, be sure to set your VSS delay to 0

[thefenixgang7]

I did read about the vss delay, and set it to 0.
As for the ferrous metal, I am guessing that the weights are not mild steel then, or maybe I just have it too far away, I have it about 1/4" away, if all else fails I will weld bolts as you did.
Could you post a pic of the finished product?