How much labour to fit Quaife LSD on 993?

[Mario149]

My 993 will need a new clutch shortly and I'm thinking of adding a quaife LSD while it's being done. I was under the impression that it was a simple "while you're in there" job whereby they just bolt in the new part in place of an old one, but have been quoted about 4 hours of extra labour required to set up(?) the diff meaning that

Clutch only = £1.1k all in
Clutch + LSD = £1.1k + £900 (LSD itself) + £350 (extra labour) = ~£2.4k all in

Is the extra labour justified? I don't mind forking out for the diff in terms of parts price, but the extra labour is rather the straw that is breaking the camel's back and am now thinking I'll give it a miss

[fioran0]

Are the Quaife diffs for the 911s not torque biasing types?

[Mark A S]

To Fit the new LSD diff ideally you will want new diff side plate bearings as well. After fitting you then should measure the pre load mesh on your CWP which will entail removing the diff again to check the mesh, re fit, check again etc.
Just measuring the old diff and new diff then adding any shims will not guarantee 100% correct alignment with new bearings, so to quote you 4 hours to do IMO is VERY reasonable.

Have Quaife got a unit in stock do you know? I am in the middle of sorting an LSD / ATB etc in my 996T, Quaife had none in stock with a 14 week lead time!

I have a Wavetrack Torsion type diff coming now, thanks to RPM and my old mate Bob Watson.

[Wozy68]

Mario149 said:

My 993 will need a new clutch shortly and I'm thinking of adding a quaife LSD while it's being done. I was under the impression that it was a simple "while you're in there" job whereby they just bolt in the new part in place of an old one, but have been quoted about 4 hours of extra labour required to set up(?) the diff meaning that

Clutch only = £1.1k all in
Clutch + LSD = £1.1k + £900 (LSD itself) + £350 (extra labour) = ~£2.4k all in

Is the extra labour justified? I don't mind forking out for the diff in terms of parts price, but the extra labour is rather the straw that is breaking the camel's back and am now thinking I'll give it a miss

You really sure you want one? I asked on here a year or two back for my 993 and the concensus was leave well alone.
My thoughts were it would be great on my C2 for the Mountain twisties I race around down in Spain once a year, alas it seemed those in the know were to leave well alone unless I tracked her, which I do not.
I was even getting PMs telling me it was a waste of dosh.
So I listened, and decided against it.

[Mario149]

Mark A S said:

To Fit the new LSD diff ideally you will want new diff side plate bearings as well. After fitting you then should measure the pre load mesh on your CWP which will entail removing the diff again to check the mesh, re fit, check again etc.
Just measuring the old diff and new diff then adding any shims will not guarantee 100% correct alignment with new bearings, so to quote you 4 hours to do IMO is VERY reasonable.

Have Quaife got a unit in stock do you know? I am in the middle of sorting an LSD / ATB etc in my 996T, Quaife had none in stock with a 14 week lead time!

I have a Wavetrack Torsion type diff coming now, thanks to RPM and my old mate Bob Watson.

Thanks for the info. In truth I hadn't checked for stock, but Wavetrac was also on my radar

[Mario149]

Wozy68 said:

You really sure you want one? I asked on here a year or two back for my 993 and the concensus was leave well alone.
My thoughts were it would be great on my C2 for the Mountain twisties I race around down in Spain once a year, alas it seemed those in the know were to leave well alone unless I tracked her, which I do not.
I was even getting PMs telling me it was a waste of dosh.
So I listened, and decided against it.

These were basically my thoughts. For £900 bolt in as if it were a simple swap, I would have gone ahead with it as I do track the car. But the extra 4 hours or so of labour does tip it over even the man-maths threshold, so I think I'm going to ditch the idea

[ras62]

fioran0 said:

Are the Quaife diffs for the 911s not torque biasing types?

IIRC this is correct in which case the main benefit on a 911 of lock up on deceleration is missing.

[thegoose]

£350 for 4 hours sounds too much - I think I'd find someone with a lower labour rate, which will save on the initial clutch labour too, which should help a bit with the man maths of going for an LSD.

[Mario149]

thegoose said:

£350 for 4 hours sounds too much - I think I'd find someone with a lower labour rate, which will save on the initial clutch labour too, which should help a bit with the man maths of going for an LSD.

Lol! Difficult to find a specialist in/near SW London that'll charge less than £70/hr + VAT, although I am open to suggestions if people do know someone.

[fioran0]

ras62 said:

fioran0 said:

Are the Quaife diffs for the 911s not torque biasing types?

IIRC this is correct in which case the main benefit on a 911 of lock up on deceleration is missing.

Exactly

[Mario149]

fioran0 said:

ras62 said:

fioran0 said:

Are the Quaife diffs for the 911s not torque biasing types?

IIRC this is correct in which case the main benefit on a 911 of lock up on deceleration is missing.

Exactly

Hang on, I thought Quaiffes did lock up under deceleration, it was only if one wheel was unloaded (I.e. In the air) that they stopped working?

[Nurburgsingh]

I went through the same man maths calculations a few years ago.

Ended up with a KAAZ diff fitted by EMC in Birmingham. Also had a single mass flywheel and RS clutch fitted at the same time.

Their labour costs ain't anywhere near that and theres plenty of nice routes between London and Bham.

[wfarrell]

An alternative to the Quaife is the Wavetrac - their helical gear technology provides limited axle slip in both positive and negative torque conditions - also quieter and lower/zero maintenance vs. traditional friction plate style LSD (but would chose the friction plate route any day for heavy duty track use...)

Cheers, Will