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Home > Technical > 2WD/4WD Question |
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rambling rollie Member Since: 22 Jul 2017 Location: Port Elizabeth Posts: 62 |
My understanding is that it's 4 wheel drive initially and becomes predominantly 2 wheel drive at around 40kph (thanks to the haldex) |
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29th Jul 2021 6:12 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3107 |
The FL2 has an Haldex unit which is electronically controlled to provide 'Active On Demand' drive to the rear wheels.
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29th Jul 2021 8:32 pm |
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Bobupndown Member Since: 26 Dec 2014 Location: Upside down behind the TV! Posts: 2791 |
I'm thinking it will spin all 4 wheels, drive biased 80/20 or 90/10 front to rear in normal conditions but it doesn't decouple the rear axle with 100% fwd. Landrover - turning owners into mechanics since 1948 2014 Orkney grey Freelander SD4 GS. 2004 Zambezi silver Discovery 2 Td5 (Gone) 1963 Surf blue Morris Mini Minor Super de Luxe (my little toy) |
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29th Jul 2021 9:08 pm |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4952 |
If you think about, if the front wheels turned without any drive going to the rear then that would be detected as loss of grip at the front wheels and the haldex would be engaged to drive the rear wheels.
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29th Jul 2021 10:16 pm |
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IanMetro Member Since: 11 Sep 2017 Location: Somerset BS21 Posts: 3107 |
Try this link for full operating description from FL2 Workshop Manual
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29th Jul 2021 10:30 pm |
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Landy64 Member Since: 15 Sep 2018 Location: South Yorkshire Posts: 30 |
Thanks Rambling, Ian, Bob and Jules for your comments so far and the links I will read into.
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30th Jul 2021 6:40 am |
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Bobupndown Member Since: 26 Dec 2014 Location: Upside down behind the TV! Posts: 2791 |
If its faulty and not working you'll get warning messages saying special progress (terrain response) unavailable. It will also spin front wheels pulling away from a wet junction which it never does in 4wd. Landrover - turning owners into mechanics since 1948
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30th Jul 2021 7:18 am |
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BossBob Member Since: 30 Sep 2010 Location: Bristol Posts: 1369 |
Land Rover are the only car manufacturer who says it isn’t a service item. All the other users (eg. Volvo, Audi) of our Haldex units recommend fluid changes. While awkward to do, that isn’t a reason not to at least change the fluid. As for why it has a Haldex, the unit overcomes the problems caused by the system used on the fl1 which probably caused the fl1 loaner you drove to have the back axle disconnected. If the Haldex is working properly you don’t get the windup problems caused by differing tyre diameters front to back or side to side but you have all the advantages of 4wd when it’s needed. |
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30th Jul 2021 8:16 am |
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jules Member Since: 13 Dec 2007 Location: The Wilds of Warwickshire Posts: 4952 |
Sometimes if the haldex is not working properly the tyres "skid" when you turning slowly on full lock because the haldex is failing to allow the rear wheels to follow their different turning circle compared to the front tyres. A useful test is to disconnect the haldex (pulling the fuse or the plug); the haldex pump stops working and the rear wheels are disengaged from the propshaft and now free to follow their own path. Jules |
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30th Jul 2021 8:21 am |
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