Have a question or want to start a discussion? Post it! No Registration Necessary. Now with pictures!
- Posted on
- Wheel rotation pickups and torsen mechanism
- Eric Lucas
July 9, 2003, 10:36 pm
rate this thread
Saw something interesting on my car when it was in for the tire install
yesterday. On the axle just inside the rear brake rotors on both wheels,
there is what appears to be a series of magnets, and a magnetic pickup
hanging over them--some sort of electronic rotation sensor. Possibilities
that occurred to me are 1) speedo pickup, but I thought that's usually on
the transmission, 2) wheel rotation pickup for the ABS, but they should be
on the front wheels too, and I didn't see any similar thing on the front,
or, the only other thing I can think of is 3) wheel rotation pickup for the
This got me to thinking about how the Miata's LSD works. The descriptions
I've read about generic torsens is that they work entirely based on an
internal mechanism, with no electronic feedback, that uses worm gears
instead of hypoid gears so that transmission of force is unidirectional from
the differential to the axles, and not from the axles to the differential.
Does the Miata torsen actually have axle rotation sensors, with a
clutch-type LSD where the clutches are controlled by electronic feedback
loops? What gives?
Re: Wheel rotation pickups and torsen mechanism
ABS is correct. There should be similar rotors on the front, pressed
onto the back of the hubs. They look like gears with lots of teeth.
Brake parts are probably blocking your view.
Lanny Chambers, St. Louis, USA
the alignment page: