madteg
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| posted on 10/12/11 at 10:05 AM |
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Quaife diff
Thinking of fitting a new diff, has anybody fitted a quaife unit to a 7" sierra diff housing. What sort of job is if and is there anything i
should know. Like what sort of diff is best plate or the other sort that i cannot spell
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Rob Allison
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| posted on 11/12/11 at 10:34 AM |
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There not to hard to do if your just swaping centres. Undo side bearings, remove crown wheel from centre, fit to new one. Refit side bearings. setup
backlash and load up bearings.
plated are best, £750 for one.
ATB are fit and forget. Nothing to wear out. £550
Viscus are the standard one. From either XR4x4 or a cosworth 4x4 . There ok and about £100 for a complete diff.
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TimC
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| posted on 11/12/11 at 11:16 AM |
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The ramp angles etc should be correctly set on a plate-type diff (Tran-x, Gripper etc) and the clutches do wear. I'd suggest that you get
someone who really knows what they are doing to set-up a plate-type diff. Matt/Ivan at Procomp or Andy at Arrow Auto Engineering would be the
forum-dwelling folk I'd ask.
The Quaife is a less involved job but I'm still getting Matt to fit mine to my English diff (fit the recommenced solid spacer, inspect/replace
bearings etc.) That way, I know that it really will be fit'n'forget.
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westy turbo
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| posted on 13/12/11 at 05:36 PM |
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Ill guess the plated diff will last less but i guess has to do with torque and how often the next overhaul will be.
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hobbsy
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| posted on 13/12/11 at 06:04 PM |
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Only other downside of the Quaife ATB is that if one contact loses contact with the ground altogether then it acts like an open diff. Not normally a
problem unless you really ride the kerbs on track.
I went for a Quaife and got Phil at Road and Race transmissions to fit it as it was a pain to remove my diff and didn't fancy doing it again if
I messed up the fitting of the LSD.
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Stott
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| posted on 13/12/11 at 07:56 PM |
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quote:
Originally posted by hobbsy
Only other downside of the Quaife ATB is that if one contact loses contact with the ground altogether then it acts like an open diff. Not normally a
problem unless you really ride the kerbs on track.
I went for a Quaife and got Phil at Road and Race transmissions to fit it as it was a pain to remove my diff and didn't fancy doing it again if
I messed up the fitting of the LSD.
Isn't the point of the atb to get the torque to the gripping wheel, so if you hop a wheel in the air than all the torque should go to the other
wheel, it should never act like an open diff
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hobbsy
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| posted on 13/12/11 at 08:11 PM |
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No for it to work it needs to have *some* resistance on the other wheel, even if it's a very small amount, see here:
http://en.wikipedia.org/wiki/Limited_slip_differential
"In the case of slip, the wheel in contact can receive up to X times the torque applied to the wheel which is slipping, where X is the torque
multiplication value for the differential. In this sense, torque sensitive differentials are not strictly limited slip - once an output shaft becomes
free (e.g., one driven wheel lifts off the ground; or a summer tire comes over ice while another is on dry tarmac when the car goes uphill), no torque
is transmitted to the second shaft and the torque-sensitive differential behaves like an open differential."
To be honest I've never found it an issue.
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Stott
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| posted on 13/12/11 at 10:02 PM |
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Every day's a school day!
Anyway, I'm gonna try it next time I'm out the garage, standby for either "quaife diffs do act like open diffs!" thread or
"wanted - garage door" thread
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snapper
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| posted on 13/12/11 at 10:50 PM |
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I had a thought...........
You can get a valve that retains a little pressure to the calipers to stop the pads retracting when racing,
Just a few pounds pressure but should be enough to stop the ATB spinning free.
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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