JoelP
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| posted on 27/5/06 at 03:53 PM |
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Freelander diff
I bought one the other day, seeing as theres so little information about them on this forum i thought id just post picture. Sierra open push fit diff
is beside it for comparison, which weighs 45lbs (circa 20.5kgs), the freelander diff weighs about 32lbs, or 14.5 kgs. Ratio is the same as all of
them, 3.21. This diff appears to be absolutely ideal for a BEC, its 6kgs lighter, the ratio isnt far off the 3.14 sierra diff, and it only cost me
£150. Im sure you could get one cheaper from a breakers anyway.
The only drawback i can see so far is that the mounts are behind the driveshafts, making it quite different to the sierra ones. Worse for me as i
wasnt planning on having a full 'diff box' so to speak, in fact the car would've almost ended at the bulkhead. However, its not the end
of the world as i havent started on the backend yet, so i can modify my plans. Heres the pic:
 
Rescued attachment diffs.JPG
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coozer
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| posted on 27/5/06 at 04:06 PM |
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Nice and cheap! I was told a second hand one from the breakers was £450, with £1500 for a new one!
I know Ford pay £50~£60 for them in the plant!
1972 V8 Jago
1980 Z750
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JoelP
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| posted on 27/5/06 at 04:15 PM |
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i managed to persuade a chap on ebay to end it early! 
if anyone has a picture of one fitted, id be very grateful! 
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MikeRJ
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| posted on 27/5/06 at 05:26 PM |
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What are you doing about driveshafts? If you want to use the Sierra hubs/brakes etc. I guess you will need to include the price of custom driveshafts
into the budget.
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JoelP
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| posted on 27/5/06 at 05:41 PM |
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not too sure just yet, when i was planning on using a sierra diff i was hoping for inboard brakes, not sure how that could work with push in
driveshafts. Time will tell
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cossey
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| posted on 27/5/06 at 07:20 PM |
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on my fury im using a frelander diff with sierra shafts that have had the internal cvs changed to the landrover ones.
this hows how kcw do it, it might be worth checking out some of the st cars too as they use it as well.
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MikeRJ
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| posted on 27/5/06 at 08:19 PM |
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quote:
Originally posted by cossey
Those top diff mounts don't look overly confidence inspiring, considering the large torque reaction that they have to withstand, is that a
factory design?
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Bob C
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| posted on 27/5/06 at 09:06 PM |
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"Those top diff mounts don't look overly confidence inspiring"
My thoughts too - I reckon on 1000Nm on the diff which would translate to (say) 700Nm on that bit of square tube the top mounts are welded to.
hmmmmmmmmm......
round tube would make it a bit better
Bob
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cossey
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| posted on 28/5/06 at 08:20 AM |
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factory design and there have been no reported failures. that pic id from Tim Hoverd's racing fury and it has been treated fairly harshly with
no problems. a short 25mm tube in a strong structure csn probably take several times that load. a round tube would be much worse as there would be
less material and a lower moment of area.
also how do you get to 1000nm an r1 car puts more like 400nm in first gear so a busa wont be more than 500nm.
[Edited on 28/5/06 by cossey]
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MikeRJ
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| posted on 28/5/06 at 10:55 AM |
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quote:
Originally posted by cossey
also how do you get to 1000nm an r1 car puts more like 400nm in first gear so a busa wont be more than 500nm.
Now multiply by the diff ratio...
The inconsistency between the strong, well engineered bottom brackets and the flimsy looking top ones is really what prompted my comment.
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JoelP
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| posted on 28/5/06 at 11:00 AM |
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cheers for the pics coozey, much appreciated. I have a plan forming about how i will mount it and the bones, means i can get on with the tunnel now.
As for the upper mount, it does look puny compared to the bottom one, but the proof is in the pudding.
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MikeRJ
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| posted on 28/5/06 at 11:27 AM |
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Joel, any idea what sort of power these diffs can cope with reliably?
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Bob C
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| posted on 28/5/06 at 11:36 AM |
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Fair enough if none have broke (yet). as above, just a 1st impression looking at the pic - it looked like 3/4 square holding the top bracket on the
foto. In fact there could be all sorts of strengthening not visible on the fotos.....
To accelerate a 1000lb car at 1G using a wheel with a radius of 1 foot - that's 1000 ftlbs of torque (sorry - not Nm). A racing car will do that
"steady state", never mind transient effects!
That top tube is subject to a bending force and a twisting force - my feeling was that the twisting force was more severe which was why I suggested
round; without proper analysis it's all just hot air!!!!
cheers
Bob
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JoelP
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| posted on 28/5/06 at 11:45 AM |
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quote:
Originally posted by MikeRJ
Joel, any idea what sort of power these diffs can cope with reliably?
I wouldnt even worry about breaking it, unless it was a problem in freelanders, which come with v6s in come models.
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cossey
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| posted on 28/5/06 at 11:55 AM |
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there are 3 mounts on the diff so torque about the back axle isnt a problem the top mounts are only there to stop torque about the propshaft. btw its
1" tube.
[Edited on 28/5/06 by cossey]
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JoelP
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| posted on 28/5/06 at 12:06 PM |
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i think ive got mine upside down then! my front mounts are on the n/s. Are all three essential?
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MikeRJ
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| posted on 28/5/06 at 01:10 PM |
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Ahh, that second picture explains a lot, the top brackets really don't have to do much at all with those front mounting bolts.
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Bob C
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| posted on 28/5/06 at 02:09 PM |
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That'll teach me to get 1/2 the picture & shoot my mouth off.
So JoelP - 6 reverse gears and none forward, that should be interesting!!!! ;^)
Bob
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JoelP
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| posted on 28/5/06 at 03:24 PM |
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lol
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the_fbi
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| posted on 28/5/06 at 05:47 PM |
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Joel couldn't you just use the standard Westfield mounts for Megablade/Megabird which bolt the freelander diff straight onto the normal
7/7.5" Sierra diff points.
I can't imagine them being expensive as they are very simple.
I can't scan the page in at home, but I'll try and take a photo from the manual.......
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JoelP
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| posted on 28/5/06 at 05:50 PM |
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cheers mate, that would be very useful.
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the_fbi
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| posted on 28/5/06 at 05:59 PM |
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Big pic (1.8mb) so linked rather than pictured.
There are some build pictures in the manual too, but they aren't very clear in the manual so are pants photo'd.
big pic linky
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cossey
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| posted on 29/5/06 at 05:17 PM |
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quote:
Originally posted by JoelP
i think ive got mine upside down then! my front mounts are on the n/s. Are all three essential?
i would use all three as it will keep the diff under better control and reduce the stress on each mount (the lateral ones dont look that strong on
mine)
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