Thread: D4 Any Added Value of Rear Diff lock over TRS?

Thanks Gordon - have booked marked it for reading in detail.

By the way anyone know the brand of diff in the D3??

Garry

Originally Posted by gghaggis

Ben - it's variable-pressure (via electronic control) - it never fully locks. I suppose you _could_ wire up a potentiometer + relay.

It uses a stepper motor to wind-in the pressure plate. I cannot see why it couldn't/wouldn't totally lock if the ecu thought the situation required it but setting-up software to emulate the ecu could take a lot of trial and error testing.

Originally Posted by gghaggis

it never fully locks.

In that case I wonder why they didn't just fit an LSD. LSD+ETC is almost as good as a locker according to those who have compared the two in competition rock crawling.

Why hasn't anyone made a front or rear locker for that matter for the D3/4, is it because of how the drive system works??

OR

Is it because they think it won't be used in the tuff stuff like other 4WDs and why only a rear E locker from the factory

Baz.

Originally Posted by isuzurover

In that case I wonder why they didn't just fit an LSD. LSD+ETC is almost as good as a locker according to those who have compared the two in competition rock crawling.

I guess to have it under control of the traction system, they wanted an electronic system. And according to LR, it locks to "99%", so more aggressive and much faster than an LSD.

Cheers,

Gordon

Originally Posted by Redback

Why hasn't anyone made a front or rear locker for that matter for the D3/4, is it because of how the drive system works??

OR

Is it because they think it won't be used in the tuff stuff like other 4WDs and why only a rear E locker from the factory

Baz.

I think the ETC could get a bit of a headache if the diff was locked and it didn't know about it. The manufacturers of after-market diff locks probably wouldn't want to get involved in modifying the software.

Originally Posted by Redback

Why hasn't anyone made a front or rear locker for that matter for the D3/4, is it because of how the drive system works??

OR

Is it because they think it won't be used in the tuff stuff like other 4WDs and why only a rear E locker from the factory

Baz.

Well, the factory already supplies an exceedingly good rear locker if required, so the aftermarket manufacturers would have a pretty small market - probably just not worth it.

And you don't need a front locker on a D3/D4 - they perform just fine with the ETC and Terrain response - in fact probably better.

Cheers,

Gordon

I have a TR query.
Yesterday, I took my young bloke for some light off road stuff. I did a few culvert drains cross axled that had water in them and fairly slippery (Pirelli ATR tyres). Went extremely well.
I selected low range, S2, and raised the suspension. Went straight through without any slippage or noises from the transmission, wheels etc.
After doing this several times, I realized that I hadn't used the terrain response settings. I then selected Mud Ruts and went back through the same culverts. Every other setting was the same.
I then heard noises from the transmission, wheels etc.
I understand that it is the TR that creates 'the noises' , however the vehicle seemed to drive through the culverts perfectly without it selected
Cheers, Craig