Wheel Speed Sensor Accuracy?

[cmdr jim]

With our Jeeps, what amount of deviation can our wheel speed sensors be at, before throwing error codes? 1%, 2% etc?

[Sal-XK]

Because of being able to run a stock spare with bigger tires with no codes I'm going to guess at least 5%

[07JeepXK]

Who has ran the stock spare with bigger tires. I though we came to the conclusion that wouldnt be a good idea since were full time 4x4

[Sal-XK]

Who has ran the stock spare with bigger tires. I though we came to the conclusion that wouldnt be a good idea since were full time 4x4

Caleb blew a tire and the stock spare was all he had and on the mountain in the middle of the night we had no choice. He then had to drive over 50 miles to find a place to get a new one. He had no issues threw no codes on his search.

[cmdr jim]

What size tires was he running at the time? Stock is 245/70-17 correct?

You know where I'm going with this, right guys? I have found a place for another wheel sensor and tone ring for my QT2 transfercase when it's in low lock. But the wheel sensor will be off about 2%, on all wheels. 18 teeth vs. 17.647 teeth.

[07JeepXK]

What size tires was he running at the time? Stock is 245/70-17 correct?

You know where I'm going with this, right guys? I have found a place for another wheel sensor and tone ring for my QT2 transfercase when it's in low lock. But the wheel sensor will be off about 2%, on all wheels. 18 teeth vs. 17.647 teeth.


Stock is 245/65R17

[cmdr jim]

I found another approach where I will be off by only 0.3 percent. I think that will be close enough :)

[Matt]

What approach is this?

I was talking to my professor yesterday and he explained how the active wss sensors work and that their circuitry is likely capping the signal peaks to give the ABM a consistent amplitude throughout all speed ranges. He said if we can verify this with an oscilloscope or maybe even a meter, it wouldn't be difficult to make a conditioner to do exactly what we want it to do.

I could've swore I saw posts by a member here doing some testing with an oscilloscope....

[cmdr jim]

What approach is this?

I was talking to my professor yesterday and he explained how the active wss sensors work and that their circuitry is likely capping the signal peaks to give the ABM a consistent amplitude throughout all speed ranges. He said if we can verify this with an oscilloscope or maybe even a meter, it wouldn't be difficult to make a conditioner to do exactly what we want it to do.

I could've swore I saw posts by a member here doing some testing with an oscilloscope....

The Dakota Digital SGI-5 won't recognized the signal. It wants 0 to 12vdc or 0 to 5vdc. If you are getting somewhere with a signal conditioner that would be the best way of doing it hands down. But I'm still looking at alternative approaches as well.
If you can do this, we should probably find out the true ratio of the NV245, they state 2.72. Just like 3.73 gears are really (41/11) or 3.7272727......
What I am finding out is all wheel tone rings are 48 teeth per rev. If the transfercase is truely 2.72 the conditioner would need to be 1/2.72 of 48.