Thread: E-diff retro fitting.

Originally Posted by trobbo

Given the integrated nature of the whole terrain response system I wonder what negative side affects you would achieve by tricking the trs into beliving that both back wheels are turning at the same speed? Thinking here activiation of the centre diff lock and perhaps something when the steering wheel is turned which would cause the system to expect the back wheels to turn at different speeds and thus triggering some sort of unwanted intervention.

You wouldn't be "tricking the trs" - both back wheels would actually be turning at the same speed offroad. This would be the same as you could actually encounter offroad - if the rear wheels were on a hard packed, smooth surface and the front was on an uneven surface. At lower settings (voltages) there could be differences between the wheels, as the e-diff is not a true locker as mentioned.

Doesn't the terrain response control suspension, gearbox shift patterns and throttle control??? The ETC is coupled to terrain response but acts much in the same way as ETC on earlier models (albeit further refined).

As ARB have mentioned, they have had a good look at an LR3/4, and dismantled the diff(s) on one. The only reason they haven't built a locker yet is development cost, not because it will interfere with the TRS.

The E-diff uses a stepper motor that is operated by sending a predetermined number of pulses of the full operating voltage in the appropriate direction to achieve the desired pressure on the plates for anything from totally unlocked to totally locked. Full 12v will burn-out the stepper motor once it can no longer move the adjusting cam and no voltage will not reverse the motor to reduce pressure on the plates as stepper motors don't move without voltage.

A manual system could be setup to provide forward (lock) and reverse (unlock) voltage for a short period only - probably just a few milliseconds.

If one is going to the trouble to fit the diff itself, why not go the rest of the way to install the ecu and wiring and reconfigure the vehicle to use the e-diff?

I've got a 05 D3 poverty pack, so no air sus. I have lamented many a time the lack of a diff lock and have been stuck on so small a diagonal it's not funny.
What would be a simple fix?