 | Home > Puma (Tdci) > Diff lock |
 
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| 110SEB Member Since: 29 Jan 2009 Location: Essex, England Posts: 1444   
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It's best to use before you get stuck. It fuses the front wheels together and the rear wheels together, but not the front and back together, if you see what I mean
 If you know you're going to be driving on something that you know will offer very little traction then you're better off with difflock on, but remove it as soon as you're on solid ground as the two pairs of wheels will not necessarily spin at the same rate (when turning for example) and may cause damage.
Difflock may not always switch off immediately, so try reverse a little and then forward to release it. In reality in icy snow try difflock and low range 2nd and your Defender should just march through. Things are always much harder once you're stuck. Hope this helps but I know there'll be much more advice on it's way...  |
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4th Dec 2010 8:34am |
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| alantd Member Since: 14 Dec 2008 Location: Northamptonshire Posts: 1513 
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Eh? CDL fuses front and rear prop shaft. Front and rear DIFFs get the same torque. However, left and right front are still independent and left and right rear are still independent which is why you can end up cross-axle'd and going nowhere (which traction control tries to remedy). Seb - I don't for 1 minute question whether you know how CDL works but I think your explanation was a bit confusing  One that started out as a 2.4 TDCi 110 XS
+ New Defender 110 First Edition |
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6th Dec 2010 10:53pm |
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| yaho Member Since: 26 Nov 2008 Location: Bialystok Posts: 200  
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From your experience guys, is front diff lock enough? Or shall I go for both - front and rear.
I am preparing the vehicle for overland expedition - sand and mud expected. Janusz www.yahodeville.com |
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7th Dec 2010 9:10am |
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| alantd Member Since: 14 Dec 2008 Location: Northamptonshire Posts: 1513
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You should be OK with just the centre lock (I assume your 2007 PUMA has traction control) but if you want to spec it up, generally a rear locker is the way to do it. A front locker will seriously hinder your ability to steer. The main thing to do is to ensure your half shafts are up to it. If you're feeling like belt and braces, upgrade the front diff as well to cope with the extra torque you'll be putting through it. One that started out as a 2.4 TDCi 110 XS + New Defender 110 First Edition |
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7th Dec 2010 9:18am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2651  
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if your CDL is engaged, the front and back wheels should be rotating at the same speed. |
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7th Dec 2010 12:23pm |
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| DefenderOfTheEarth Member Since: 09 Nov 2010 Location: Cornwall, UK Posts: 1304
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Diff lock should make a BIG difference to grip.
Got stuck in a field (icy "ramp" down to it) two weeks ago - no way it would get out without difflock (unless I took a big run up - which wasn't possible). With difflock I got out the 2nd time. Defender 110XS SW gone... now VW California 180 4 Motion. |
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7th Dec 2010 12:28pm |
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| Zinke Member Since: 27 Jan 2009 Location: Scunthorpe Posts: 670 
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In theory, with out the centre diff locked all the engine power can go to just 1 wheel (1 wheel drive), with it locked then the power has to go to at least 2 wheels (2 wheel drive).
If you then put a rear locker in the rear diff you then get full power to at least 3 wheels. Its only when you lock all 3 diffs in the transmission that you get get true 4 wheel drive. This is all in theory, in the real world it very rarely works like that and unless your are cross axled or on pure flat ice up a hill then forward momentum is normally not lost, as long as you use the centre diff lock to provide 50% power to the front and 50% power to the rear. Pete. |
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7th Dec 2010 12:54pm |
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| SteveS Member Since: 05 Oct 2010 Location: Devon & Berkshire Posts: 388  
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Yes having just a CDL on means you can put all the power through 1 front and 1 rear wheel - both of which will spin nicely. There's plenty of threads on here with descriptions of operation
Just to support what others have said I spent much of the weekend on sheet ice, often on hills up to 1 in 4 here in Dartmoor using just the CDL. Had the front and rear ARB lockers primed ready to go but with a bit momentum, a modicom of slip I only had to use the rear locker once. BFG 285/75 MT's did well considering the main problem was ice not snow |
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7th Dec 2010 9:20pm |
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