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Home > General > Do Freelander 2's suffer Transmission wind up?
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marklp



Member Since: 31 May 2013
Location: Porthcawl
Posts: 34

United Kingdom 2010 Freelander 2 TD4 HSE Auto Santorini Black

Ah - I had a feeling it would be something along those lines Thumbs Up 2010 Freelander 2 HSE Auto Santorini Black / Ebony Leather

Post #225934 30th May 2014 8:52 pm
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pab



Member Since: 28 Aug 2012
Location: Now in Mid-Wales
Posts: 2006

United Kingdom 2009 Freelander 2 TD4 XS Manual Lago Grey

Billsy wrote:
So to answer the ops question wind up is not an issue as the haldex would disengage in any mode before the trans was loaded up.

Try selecting GGS mode and doing a few tight turns on tarmac and I think you'll find the FL2 can suffer wind up!

Post #225935 30th May 2014 9:23 pm
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ghawk2005



Member Since: 15 Sep 2013
Location: Plymouth
Posts: 172

United Kingdom 2010 Freelander 2 SD4 XS Manual Santorini Black

thanks guys that's really interesting!

Post #225938 30th May 2014 10:38 pm
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Billsy



Member Since: 09 Dec 2013
Location: Mid Sussex
Posts: 180

United Kingdom 2007 Freelander 2 TD4 SE Auto Tonga Green

pab wrote:
Billsy wrote:
So to answer the ops question wind up is not an issue as the haldex would disengage in any mode before the trans was loaded up.

Try selecting GGS mode and doing a few tight turns on tarmac and I think you'll find the FL2 can suffer wind up!


Again in this situation wouldn't the car take the steering angle and other parameters and disengage the haldex if doing tight turns stopping wind up?

Has anybody on here suffered wind up ? (of the transmission kind!)

Post #225942 31st May 2014 5:33 am
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pab



Member Since: 28 Aug 2012
Location: Now in Mid-Wales
Posts: 2006

United Kingdom 2009 Freelander 2 TD4 XS Manual Lago Grey

Only in 'normal' mode, not special programs. See LR's description of GGS in my earlier post.

Post #225945 31st May 2014 8:09 am
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dunkley201



Member Since: 09 Jul 2011
Location: Lincolnshire
Posts: 2739

United Kingdom 2010 Freelander 2 TD4 HSE Auto Stornoway Grey

You can also get wind up on the straight and level. See my experience here: http://www.freel2.com/forum/topic19396.html And yes, it WAS the Haldex! 10MY (Sept 09) TD4 HSE Auto in Stornoway Grey (Now Gone)

08 FL2 TD4 SE Manual in Rimini Red (Now Gone)

Post #225946 31st May 2014 8:48 am
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Billsy



Member Since: 09 Dec 2013
Location: Mid Sussex
Posts: 180

United Kingdom 2007 Freelander 2 TD4 SE Auto Tonga Green

pab wrote:
Only in 'normal' mode, not special programs. See LR's description of GGS in my earlier post.


Ok so the Haldex locks permanently with a terrain response program selected.

I thought it was a bit cleverer than it actually is.

Cheers for helping me understand it's functionality.

Post #226103 2nd Jun 2014 5:56 am
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dunkley201



Member Since: 09 Jul 2011
Location: Lincolnshire
Posts: 2739

United Kingdom 2010 Freelander 2 TD4 HSE Auto Stornoway Grey

The Haldex is not so simple:

Haldex GenIV consists
of four functional parts:

1. Hydraulic power pack with electrical motor and accumulator

2. Wet multi-plate clutch

3. Controllable pressure-reducing valve

4. Electronic control unit (ECU)

​Haldex Generation IV is an electronically controllable all-wheel drive
coupling for cars. The Haldex GenIV includes an electronic control unit with vehicle dynamics software that can be customized to meet each carmaker's particular desires in terms of driving characteristics.

The front and rear axle of the car are connected via the wet multi-plate clutch which makes it possible to vary the torque distribution between the two axles. As the function of the Haldex GenIV is independent of the differential speed between the front and rear axle, full locking torque, if needed, is available at any given time and speed.

When starting the vehicle, the electrical pump in the Haldex GenIV is started, swiftly providing the system with pressurized oil and thereby making the system ready for operation. The control valve sets the pressure to the piston which in turn compresses the disc package. The level of pressure set depends on the torque level needed and the driving situation. In traction/high slip conditions, high pressure is delivered. In tight curves (e.g., parking) or at high speeds, a much lower pressure is provided.
Extracted from:
http://www.borgwarner.com/en/Haldex-AWD/pr...-Gen4.aspx 10MY (Sept 09) TD4 HSE Auto in Stornoway Grey (Now Gone)

08 FL2 TD4 SE Manual in Rimini Red (Now Gone)

Post #226111 2nd Jun 2014 8:37 am
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pab



Member Since: 28 Aug 2012
Location: Now in Mid-Wales
Posts: 2006

United Kingdom 2009 Freelander 2 TD4 XS Manual Lago Grey

Billsy wrote:
Ok so the Haldex locks permanently with a terrain response program selected.

Not quite. It will still release as speed increases, but at a much higher speed than in normal mode, and it doesn't take account of steering angle.

Basically there's an implicit assumption in Special Programs modes that you're driving on a low-friction surface, so traction is the priority and the Haldex is locked for maximum traction. Since Special Programs are only intended for use on low-friction surfaces that's a reasonable approach. In practice you may well never reach the 'unlock' speed in Special Programs modes (I've no idea what that speed is), in which case the Haldex would remain locked whilst the system was in that mode, but off-road on a low-grip surface that's normally exactly what you want.

Quote:
In 'Grass / Gravel / Snow' mode the coupling is programmed to maintain its pre-charge state until much higher speeds are obtained. The same applies even if the vehicle is traveling at low speeds and acute steering angles, as traction takes precedence over coupling lock-up on low-friction surfaces.

Post #226113 2nd Jun 2014 9:18 am
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