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| T1G UP Member Since: 08 Dec 2009 Location: Bath Posts: 3101   
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range rover classic, i had a 3.9 v8 auto, run a viscous centre diff. one of the best set up from the factory, no centre diff to engage and allows a little spin prior to ocking up.
i had a subaru legacy last year in the snow, fantasic! car, very under rated imo. keep the scooby...landrovers are rubbish  |
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22nd Dec 2010 11:51pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5024  
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both options for front and rear diffs avaliable
and on the others (except freelander) there is an optional locking rear diff Mike |
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23rd Dec 2010 12:51am |
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| Arctic Member Since: 25 Aug 2010 Location: Europe Posts: 45 |
Yes, the old Impreza is great in the snow... as it has a good set of studded winter tires I haven't managed to get stuck yet. Thanks for the replies. Is the viscous front and rear diff option available on the Defender? Any idea why it was never used on the 90/110 centre diff. then, if it worked so well on the Range Rover? The Subaru system is certainly user friendly and effective. The low CofG also makes it easy to handle on bad roads and in traffic.
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23rd Dec 2010 8:07am |
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| Caterham Member Since: 06 Nov 2008 Location: Birmingham Posts: 6266 
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I'm sure the escort cosworth also had viscous diffs, which I presume would mean the sierra saphire also have them.
seemed to work very well although it wasn't really an issue in the dry as there wasn't enough power in standard form. |
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23rd Dec 2010 9:13am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6047 
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I think the viscous coupling was used on the rangerover and disovery for a couple of reasons:
Being automatic, no user input needed, it was deemed more "posh" than having to manually pull the difflock lever over. your average range rover driver might not be a technically savvy as a down to earth defender/90/110 driver and not know what it's all about. from an old LRO magazine write up, where they have a rangie (with viscous coupling) trying to drive over something with a front wheel, and one of the rear wheels is on a set of rollers, the vehicle doesn't move, proving that the viscous coupleing doesn't actually lock up 100% like a manually locked differential. As for front & rear diffs, i do believe that in the (Very) early days, LR did offer a LSD type of rear diff. but you can just buy a quaiffe or similar LDS/viscous unit and pop it in. I'd imagine that (unless you were planning on something like a challenge site or the camel trophy) a pair of LSD diffs and viscous center diff would get you around quite well, expecially if you also had an auto box... just point and squirt! |
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23rd Dec 2010 10:57pm |
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| Arctic Member Since: 25 Aug 2010 Location: Europe Posts: 45 |
[quote="diesel_jim"]from an old LRO magazine write up, where they have a rangie (with viscous coupling) trying to drive over something with a front wheel, and one of the rear wheels is on a set of rollers, the vehicle doesn't move, proving that the viscous coupleing doesn't actually lock up 100% like a manually locked differential.quote]
If one front wheel and one rear wheel were on rollers, surely even a fully locked centre differential wouldn't help either? All the power would be sent to the front and rear wheel with no traction as the front and rear diffs were open. I think it would need a front and/or rear difflock in this case, not a mechanical centre difflock. |
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26th Dec 2010 11:22am |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7715 
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[quote="Arctic"]
or TC Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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26th Dec 2010 11:47am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6047
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Both front and rear wheels wern't on rollers, only the back one. the front was trying to drive over something (think is was a block or an upturned wheel chock)
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26th Dec 2010 12:11pm |
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| Arctic Member Since: 25 Aug 2010 Location: Europe Posts: 45 |
Ah, sorry, that makes more sense! I suppose Land Rover know how much lock up it could achieve and it met their requirements. Clearly not as capable though, given that demo.
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26th Dec 2010 12:25pm |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6047
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I've just been searching on google images trying to find the pic, but can't
Like you say, it showed how the viscous transfer box wouldn't lock up 100% like the mechanical 90/110 type I'm sure the article was in a very early LRO. |
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26th Dec 2010 1:39pm |
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| Arctic Member Since: 25 Aug 2010 Location: Europe Posts: 45 |
Just out of interest, what systems do Land Rover use in their more modern vehicles these days? Have they moved over to all electric systems, such as TC, or do the latest Range Rovers and Discoverys still have mechanical diff. locks?
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26th Dec 2010 1:58pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 7715
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for central diff - t5 platforms and FFRR have electronic diffs which will fully lock and also offer variations between locked and open. LR2 has a viscous unit or haldex unit i believe - i cant remember, would have to look it up.
for axles diffs, ediffs available in rear only as an option on t5s, FFRR. Cheers James 110 XS Utility 130 Puma Station wagon/camper (in the making) 90 Puma Hardtop |
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26th Dec 2010 2:02pm |
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| Arctic Member Since: 25 Aug 2010 Location: Europe Posts: 45 |
Thanks for that!
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26th Dec 2010 4:52pm |
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| noworries4x4 Member Since: 24 Dec 2010 Location: Newton Abbot Devon Posts: 1195
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The P38 does lock up properly as i smashed a cv out in France once and had to remove the front prop to get home towing the racer no slip no trouble at all |
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27th Dec 2010 10:17pm |
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