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Ref; http://www.quaife.co.uk/shop/products/qdf30krQuote:
Originally Posted by BigJon
It reads like it is a arrangement like a True trac has.Quote:
Unlike a conventional plate-style limited slip differential, the Land Rover Range Rover LT230R centre Quaife ATB Helical LSD differential relies on gears rather than clutch plates for its operation.
[ame=http://www.youtube.com/watch?v=lZmsY2YvVsc]Exploded View - Inside the Eaton TrueTrac Differential - YouTube[/ame]
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The guy's at Ashcroft transmissions reckon they're great.
A gear type LSD is effectively a torque sensing diff like a Viscous Coupling.
So, I know they work and I know they fit.
So back to my original question....Is anyone running one here in Oz because it's all very well to sell them but I want to know from an actual user what they're like?
Yes, and if you lift a wheel with a truetrac it reverts to completely open, like a standard diff. They are torque biasing. Zero torque going to one side = zero torque going to the other.Quote:
Originally Posted by wrinklearthur
So that is why I have a ARB Air locker in the Salisbury diff of my Defender.Quote:
Originally Posted by BigJon
Most times you haven't got time, or enough feet, to keep a little pressure on the foot brake to keep the True trac engaged.
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Ah, the advantage of a slush-box and habitual left-foot braking... :p:p:pQuote:
Originally Posted by wrinklearthur
Would'nt a diff locker at both ends, fed from an unlocked centre-diff give a pretty good all-round performance? - with the centre-lock in reserve for the worst of the worst...
OK Jon, I'll bite seeing as I made the sweeping statement in the first place.:)Quote:
Originally Posted by BigJon
I actually checked Quaife's website before posting, under gearbox and differential and found no listing. Obviously looked in the wrong place.:(
I'm of the view that the terrain I'm driving in determines whether the centre diff should be locked or not as opposed to the manner of driving. Particularly with issues of a (centre) LSD unlocking/locking as drive changes to front/rear open diffs. But if as FIXR7 says they operate more like a viscous coupling I could be talked around. :)
I had visions of driving down a long windy bitumen road with a centre LSD operating and slowly winding the transmission up like a clock spring.:(
Deano :)
PS. I've got a feeling that LR played with LSD centre diffs in early RRC's but after chewing them to bits gave it away as a bad idea.
The tip is in the name. Limited slip. They do allow some slip, hence no wind up.Quote:
Originally Posted by DeanoH
You are correct about very early build RRCs having a limited slip centre diff, but as you say they were too fragile and were dropped from production.
according to this lotsa OEM's use the Torsen type centre diff....
They're even suggesting the L322 type Rangie uses one?
[ame="http://en.wikipedia.org/wiki/Torsen"]Torsen - Wikipedia, the free encyclopedia[/ame]
Excellent question Jon. I always assumed that the locking mechanism remained so you would have torque biasing operation when unlocked and still locked when needed.Quote:
Originally Posted by BigJon
But I haven't found anything to back up this assumption. Can anyone confirm/deny if the LT230 locking remains?
These don't lock/unlock. They are better viewed as a very strong but inefficient open diff. Where they aren't very good at letting the outputs spin at very different rpm's.Quote:
Originally Posted by DeanoH
Found in a huge range of awd vehicles, including audi Q7/vw tourag/porsche cayenne and many others with a north/south driveline.Quote:
Originally Posted by FIXR7
Anyone bothered to note the locking spline on the snout of the centre diff in the pictures or are we just using our imagination?
Good idea I think, especially when you have some torque to apply beats having the front wheel spin when you stand on it.......or in dougals case it will unless hells fury and bake all 4 tyres:rolleyes: