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Vali Holban



Member Since: 09 Mar 2017
Location: Timisoara
Posts: 3

Romania 2011 Freelander 2 TD4 S Auto Santorini Black
Freelander 2 rear diff "lock"

Hello there,

I've been playing around yesterday and got stuck in a muddy area. Perfect opportunity to test a "Bogout" recovery kit - as seen in the attached video:



Now... as I only had one rope, it didn't work - apparently because of a lack of rear diff lock to keep the rigged wheel engaged.
Reading around, I understand that Terrain Response should use ABS/TC to limit wheel slippage, but it didn't seem to be the case - the opposite wheel was turning merrily Sad

Any ideas - is there a special TR mode I need to select - I've tried both mud and sand mode - or some other tricks I could use so that I get the rear diff lock effect?

thanks,
Valentin

Post #343396 26th Feb 2018 4:05 pm
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alex_pescaru



Member Since: 12 Mar 2009
Location: Constanta
Posts: 4014

Romania 2009 Freelander 2 TD4 SE Auto Alaska White

You didn't generate enough RPM for TR to properly function.
You need to get the RPM over 2200, because TR works by braking individual wheels and it's programmed to really work only over a certain RPM to avoid stalling the engine.
For an automatic you can't stall the engine, indeed, but on a manual.... And it's designed to be the same for both manual and auto.
This is why you've seen a lot of wheel spin, but little torque to the "adherent" wheel.
Nevertheless, it's clearly seen that at the end, there was a little torque to the tied wheel when you dropped the RPM at 1:10. Roads? Where we're going we don't need roads... Go beyond !

Post #343397 26th Feb 2018 4:39 pm
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mikehzz



Member Since: 04 Sep 2009
Location: Springwood
Posts: 737

Australia 2008 Freelander 2 TD4 SE Auto Lago Grey

I think that 2200 rpm is too high. In reality, the wheel spins too much before it kicks in. If you watch a D3 or D4, the tc kicks in if the wheel spins barely one revolution.
edit- you need one on each wheel. You get a better pull that way. You have to be careful they don't slip off and wrap around the inside of the wheel.

Post #343416 26th Feb 2018 8:02 pm
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alex_pescaru



Member Since: 12 Mar 2009
Location: Constanta
Posts: 4014

Romania 2009 Freelander 2 TD4 SE Auto Alaska White

D3 and D4 have a different TC hardware/software.
Remember, I've said avoiding stalling the engine...
D3 and D4 have low range and for the same RPM, the spin at the wheels is much less in low range.
Also you can't really stall the engine in a low range... Of course, you can, but it's more difficult.
So therefore you won't see the same wheel spin, as on the case of FL2, until the TR kicks in and in low range you can control much better the wheel spin. Roads? Where we're going we don't need roads... Go beyond !

Post #343417 26th Feb 2018 8:32 pm
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Vali Holban



Member Since: 09 Mar 2017
Location: Timisoara
Posts: 3

Romania 2011 Freelander 2 TD4 S Auto Santorini Black

Thanks.

Will give it another try. Waiting for some warmer weather though, washing the car in freezing weather was a real pain...

Keep you posted,
Valentin

Post #343564 28th Feb 2018 12:14 pm
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mikehzz



Member Since: 04 Sep 2009
Location: Springwood
Posts: 737

Australia 2008 Freelander 2 TD4 SE Auto Lago Grey

alex_pescaru wrote:
D3 and D4 have a different TC hardware/software.
Remember, I've said avoiding stalling the engine...
D3 and D4 have low range and for the same RPM, the spin at the wheels is much less in low range.
Also you can't really stall the engine in a low range... Of course, you can, but it's more difficult.
So therefore you won't see the same wheel spin, as on the case of FL2, until the TR kicks in and in low range you can control much better the wheel spin.


This video ends with a D4 roll over caused by a really steep track, lifted wheels and apparently the engine stalling. I've done a couple of trips with Stefan, he's a trainer in my 4wd club.

Post #343565 28th Feb 2018 12:38 pm
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Worms



Member Since: 31 Oct 2017
Location: Highlands
Posts: 386

Scotland 

Interesting video!

The bit about HDC, in reverse, with a stalled engine in neutral...would it really have managed to slow a heavily laden car on a steep slope, without servo assistance to the brakes? 2010 model year FL2 TD4e GS - now at 100,000 miles, 26,000 of them mine.
Previously:
‘93 Defender 110 200TDi CSW
‘87 Defender 90 4 cyl Petrol
‘83 110 CSW V8 - best ever!
Range Rover 2-door V8 (not sure of year - 4-speed box and vacuum diff switch)
Series III SWB Diesel

Post #343570 28th Feb 2018 1:41 pm
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mikehzz



Member Since: 04 Sep 2009
Location: Springwood
Posts: 737

Australia 2008 Freelander 2 TD4 SE Auto Lago Grey

Good question, one for the experts I think. Logically, I would think that the HDC can't use the power assistance because that applies to the whole brake system at once, while HDC only brakes an individual wheel independently of all the other wheels. But I'm no expert, I just drive the car and hope the computer knows what its doing. Smile

Post #343612 28th Feb 2018 8:08 pm
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rchrdleigh



Member Since: 18 Aug 2007
Location: Somewhere in the East of England
Posts: 1561

England 2011 Freelander 2 TD4 XS Manual Baltic Blue

Worms wrote:
Interesting video!

The bit about HDC, in reverse, with a stalled engine in neutral...would it really have managed to slow a heavily laden car on a steep slope, without servo assistance to the brakes?


Yes it will

Post #343613 28th Feb 2018 8:13 pm
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