Does anyone use the reluctor wheel in a 4th gen rear to provide a signal to a speedometer? Just an idea to save me some $... this speedo sending unit costs about $70: http://www.summitracing.com/parts/ATM-5291/?rtype=10
I want to use a speedometer such as this: http://www.summitracing.com/parts/ATM-4486/
Not necessarily that specific one though, just one that can be calibrated.
Anyone have any input?

 

???

 

you would have to drill out the houseing to get a pickup sensor in there, then it would probably work just fine....be simple as far as that goes, just a big hole and a little screw hole, but.....
I think the reluctor wheel almost acts like a spacer on the rear end carrier package. When I bought my gears out of a 4th gen they too ring off of the 4th gen carrier and put it on my 3rd gen carrier because the 4th gen carrier is wider.
I don't know if it would fit in the due to width, or maybe incorrect gear alignment. Not sure on all this but that's what the rear end guy said about mine.

 

I don't know if you understand what I'm saying. I plan to use a complete 4th gen rear, not just the reluctor wheel from one. It already has the reluctor wheel and the sensor, and the hole for the sensor.
I just don't see any reason that couldn't work to provide a speedo signal. And save some $.

 

First of all the speedo sensor is in the trans.You have a mecanical output.If you upgrade your gauge pod to a 4th gen ,then you need to call Street and Performance,in Mena ARK,for the adaptor.P.S any rear end will work in your car.

 

Yes, I know that the speedo sensor is *usually* in the trans, but I want to save some money and use the sensor that is already in the rear end instead.
I don't have a mechanical output, or any output on my trans, because I currently have no transmission.
I don't want to use any 4th gen gauges, a 4th gen dash, or even a 4th gen speedo. I want to use an Autometer electric speedo, and I am wondering if it can be made to work with the signal provided by 4th gen rear end. I don't see why not, it seems that it should be able to made work with almost any signal provided, that changes in relation to vehicle speed.
And yes, I already know a 4th gen rear will work in my car.

 

No one has any relevant input for me?

 

It should work if the output of the single channel ABS sensor is voltage/wave compatible with the autometer. Have you done a speed-density swap or carburated? The ECM will need to be compatible with the signal also. I don't have access to a 4thgen single channel ABS setup to tell you for sure.

Many late-model cars pull VSS from the ABS BTW.

 

I'll be using a carb, non-cc, so I won't have any ECM. So I guess the only thing the speed sensor output needs to be compatible with is the speedometer.
I'm hoping the sensor in the 4th gen rear will fall into the category in bold:


• 5V Square wave (TTL)

Is there a way I could test the sensor on the 4th gen rear to see if it is compatible with the Autometer speedo?

 

Unless you can find a spec online or through a dealer for the WSS signal, you'll have to get an oscilloscope and capture the output of the WSS while turning the axle.

I suspect it's a Hall effect sender, but you may have to do some calcs on the number of teeth to see if the ppm is within range. (Should be since it's after the rear ratio, but there are alot of teeth..)

 

I currently have tires about 26" in diameter, assuming I am using those, there would be about 65 wheel rotations per mile, which means the reluctor wheel would need to have about 6200 teeth for me to exceed the 400,000 pulses per mile limit. So, I shouldn't have any problems with that, I would guess it has close to 100 teeth.

IIRC, the sensor on the rear is a 2-wire, but I'm not sure of that. I'll have to go check sometime today.

Unfortunately, I don't have an oscilloscope, so maybe I'll just have to wait to find out if it will work until I buy the gauge.

 

I checked the sender, it's a 2-wire. I was going to count the teeth on the wheel, but after one look at it I changed my mind, (there's a lot) but it doesn't really matter how many teeth there are anyways, since it is obviously under 6200.

 

Should be 40 teeth

The sensor should be within the pulse range listed

 

Ummmm.... no, there's a lot more than 40. Are you thinking of ring gear teeth, becaure there are 41 teeth on my ring gear, IIRC.