Brake Effort - ETC

**101RRS** · 2nd April 2006, 05:35 PM

I decided to take the Freelander up to Mt Corree in the Brindabella Ranges - been there before as it is a pretty easy track just rockie at the top.

While going up at the narrowest part of the track a big fat Territory came wadling down taking all the track and not making any motion to back up. I did the right thing and backed 50m back so fat boy could get past. In doing so I ended up being diagonal across the track with different traction on each of the wheels - the typical cross drive situation. I wasn't hung up - I thought no wurries as I have traction control - it will brake the loose wheels and transfer drive to the wheels with traction.

Well the ETC was working the ETC light on but no drive - it would seem that the ETC was not applying enough force to the wheels to transfer drive to the opposite wheel. ie not enough force to actually lock the spinning wheel

I believe the ABS/ETC system is basically the same as in the early Disco 2. Does anyone know if you can up the amount of pressure the ETC system applys to the brakes?

Thanks

Garry

**LandyAndy** · 2nd April 2006, 06:25 PM

Hi Gary
Does the Freelander have a CDL?????
From what you have described you were probably loosing traction front to rear due to no locked CDL???
Andrew

**101RRS** · 2nd April 2006, 07:34 PM

Originally posted by LandyAndy
Hi Gary
Does the Freelander have a CDL?????
From what you have described you were probably loosing traction front to rear due to no locked CDL???
Andrew

Freelanders do not have central diff hence no CDL - they use a viscous coupling that allows 10% torque to the back wheels when the grip on all wheels is basically the same - eg on the road. When off road the viscous coupling locks up giving 50% split front and rear. This happens automatically when the input and out shafts of the VC turn at different speeds eg as soon as the front wheels slip a little. In my case as I was stopped for about 30 secs the VC would have probably unlocked as it cooled a little but locked straight away as I tried to drive off, particularly due to the steep uneven terrain. The front spinning wheel would have told the VC lock

I had drive to the rear but the wheels with the least traction were still turning even though the ETC was activating - I had to roll back to get traction on all wheels

Cheers

Garry

**PhilipA** · 2nd April 2006, 07:54 PM

The scientific question is
Did you give it heaps???
Apparently you have to bury the foot for the traction control to work properly.
Anyway thats what I read in Pommie mags. Seems counter intuitive but there you go.
Regard sPhilip A

DionM · 11th April 2006, 10:06 PM

Can't say I've ever had any dramas with the ETC pressure on my 02 V6. I've not had it cross-axled but have had wheels in the air and scrabbling on loose rocky climbs with no dramas.

Power could be the key - the V6 obviously pumps out more than the diesels.

**101RRS** · 12th April 2006, 09:06 PM

Yeap gave it heaps and had wheels scapping but as I said the ETC was working but obviously not locking the spiininng wheels.

DionM · 12th April 2006, 09:46 PM

Originally posted by garrycol
Yeap gave it heaps and had wheels scapping but as I said the ETC was working but obviously not locking the spiininng wheels.

Was it rattling/groaning like usual?

Maybe because you were in reverse there is something weird there? Can't say for sure. Also maybe it needs more wheel speed for it to work best - at slow speeds it can't really detect what is going on (not enough motion in front of the ABS sensors).

Just guessing, of course ...

tombraider · 13th April 2006, 12:25 AM

ETC assists in proportioning drive by braking the spinning wheel.

The active word here is braking not stopping.

The jolting effect a severe clamping force would have would be to break the diffs/cv's/axles

ETC is definately not the be-all and end-all although it is amazing in what it can do.

Sitting on loose scrabbly rock/gravel, trying to move 1800kg off, uphill, is just not going to happen in any vehicle crossed up like that without diff locks.

The VC cant look that fast, and by then your digging ditches!

You did the right thing rolling back a little to gain traction and then moving off again.

Cheers
Mike
(former Freelander owner)
(former Discovery owner)
Now much enlightened TR Defender owner

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