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(Post Link) post #1 of 461 Old 17-02-09 Thread Starter
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Chilling Group Buy Quaife ATB Diff for TS & JTS Alfas

**ADMIN NOTE**

For the ALFAOWNER group buy. please go to the last page of this thread.

Kind Regards

Joe

**Original post from Alfasud.ti**



Some members of alfisti.gr have bought 13 pieces of this item from Quaife. I'm having mine fitted now and I have already had an experience as a passenger in a friend's 156 who had his fitted yesterday. All I can say is: . I believe the change in the car's cornering abilities is even more obvious than when I test-drove the first Q2-euipped V6 Alfa, probably because the engine doesn't have enough torque to spin both wheels and beat the diff.

I can't wait to get my car from the workshop and test-drive it before going to a track-day this weekend.

I seriously recommend it to anyone and I believe you can get a good discount if you make a group order as we did.

I was way more interested about this item though for my Sud but Quaife said that they do not have it in stock and won't produce it unless they get an order of at least 10 pieces. I can come up with two more buyers, anyone else interested?

"Black holes are where God divided by zero." - Steven Wright

Last edited by OperationAlfa; 20-03-09 at 13:24.
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Re: Quaife ATB Diff for TS Alfas

are there any left?

I am interested in a group D/C

What discount did you get in the end?

Joe
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Re: Quaife ATB Diff for TS Alfas

bugger, if this had come up when my gearbox was out a few weeks ago, i would have been interested. cant justify the labour again though.
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Re: Quaife ATB Diff for TS Alfas

Quote:
Originally Posted by alfasud.ti View Post
Some members of alfisti.gr have bought 13 pieces of this item from Quaife. I'm having mine fitted now and I have already had an experience as a passenger in a friend's 156 who had his fitted yesterday. All I can say is: . I believe the change in the car's cornering abilities is even more obvious than when I test-drove the first Q2-euipped V6 Alfa, probably because the engine doesn't have enough torque to spin both wheels and beat the diff.
You can't spin up both wheels with a torque biasing diff. Once one wheel looses traction, it behaves like an open diff.
 
(Post Link) post #5 of 461 Old 17-02-09 Thread Starter
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Re: Quaife ATB Diff for TS Alfas

Sure you can, I've done it with a Q2 diff.

No diff can beat Sir Isaac Newton.
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Re: Quaife ATB Diff for TS Alfas

I know I'm correct because I have quaife diff in my V6.
 
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Re: Quaife ATB Diff for TS Alfas

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You can't spin up both wheels with a torque biasing diff. Once one wheel looses traction, it behaves like an open diff.
Not sure I understand.

As I understand it, if the inside wheel span up, the outside wheel would get proportionally more and more of the available torque, until either the inside wheel regained traction or the outside wheel span up instead. If the latter happened, and you kept the power on, surely both wheels would just keep spinning? Obviously you'd need a lot of power to do this, doing it in a straight line would be near impossible..
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Re: Quaife ATB Diff for TS Alfas

I'd be up for it once it fits my 1.4 box
 
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Re: Quaife ATB Diff for TS Alfas

Hi Pud, The torque biasing diffs (e.g. Torsen and Quaife) can only transfer torque up to a certain proportion which is hardwired into the diff, and non-configurable (the torque bias ratio).

Something like 2:1 or 2.5:1 for the quaife diff (Torsen Q2 are 2.5:1 think) .

So yes you definitely can spin one wheel uselessly even with a torque biasing diff - if you try hard enough with a powerful enough car.
..and you get some ****-off torque steer at that point it happens into the bargain!
(Trust me, I have more experience than most in this regard )
Basically the issue is that the diffs are torque multipliers and 2.5 times 0 is zero if one wheel has no traction.

BTW I have a quaife diff on my modest 1.5L Starlet Autotest car (130bhp and 500kg is deceptivey fast though..), its really great for very very tight radius corners and circling where a clutch type diff would cause understeer..
Quaife is an excellent choice for a TS, no downside whatsoever.

I had no problems spinning a single wheel on my heavily modified GTA with a mechanical Q2, but with the clutchtype diff I replaced the Q2 with you really do have to spin both wheels before traction is lost - and you have to be a real pillock with the throttle
Basically on track 2nd gear out of tight corners even with with type-R tyres wasn't really usable with the Q2, but was with the AD diff.

Quote:
Originally Posted by Pud237 View Post
Not sure I understand.

As I understand it, if the inside wheel span up, the outside wheel would get proportionally more and more of the available torque, until either the inside wheel regained traction or the outside wheel span up instead. If the latter happened, and you kept the power on, surely both wheels would just keep spinning? Obviously you'd need a lot of power to do this, doing it in a straight line would be near impossible..

I'm not a doctor - but I really do recommend braking later
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Re: Quaife ATB Diff for TS Alfas

I'm in for a Quaife LSD if a group buy occurs

if its worth fitting to a 2.0L TS, that is...
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Re: Quaife ATB Diff for TS Alfas

Nice write up TB
 
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Re: Quaife ATB Diff for TS Alfas

Good explanation TB, I understand it now. If one wheel spins up, it gets all the torque, just like an open diff. But prior to the point of it spinning up it won't have hardly any torque compared to the outside wheel, so will be much more difficult to spin up than the standard open diff.
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Re: Quaife ATB Diff for TS Alfas

Definitely up for this, a Quaife is on my list of needs

how long would one take to fit\labour costs?

Does the gearbox need to be removed?My selespeed gets mad when its taken out.
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Re: Quaife ATB Diff for TS Alfas

The quiafe in mine provides the wikipedia sponsored definition of torque steer on wet or bumpy roads...

Last edited by Chris155; 18-02-09 at 11:31.
 
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Re: Quaife ATB Diff for TS Alfas

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Originally Posted by Laptop_Matt View Post
Definitely up for this, a Quaife is on my list of needs

how long would one take to fit\labour costs?

Does the gearbox need to be removed?My selespeed gets mad when its taken out.
5 hours labour minimum.
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Re: Quaife ATB Diff for TS Alfas

If its anything like fitting the Q2 to a V6/JTD, it can be done with the gearbox in situ. But we are talking about a different gearbox, so it might not be possible. If anyone has access to AutoData, what book time does it give for diff removal and refitting in a 4cyl 156?
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Re: Quaife ATB Diff for TS Alfas

The gearbox has to come off the car and be taken apart in order to change the diff. The diff is inside it and not in a separate compartment as is the case with V6 transmissions.

And the Quaife diffs have a TBR of approximately 3:1.

Here is a pic of mine with the crown wheel and bearings fitted, next to the std open diff: http://img242.imageshack.us/img242/5...2009055sj3.jpg
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Re: Quaife ATB Diff for TS Alfas

Quote:
Originally Posted by alfasud.ti View Post
The gearbox has to come off the car and be taken apart in order to change the diff.
Damn,

Think i'll wait for the gearbox to give out then and get one fitted then - its the only original part left on the car!
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Re: Quaife ATB Diff for TS Alfas

V6 Quaife:





 
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Re: Quaife ATB Diff for TS Alfas

I want
 
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Re: Quaife ATB Diff for TS Alfas

Thats a standard open diff next to the Quaiffe, not a Q2, just in case anyone is wondering.
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Re: Quaife ATB Diff for TS Alfas

if a group buy does occur, i will be up for it
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Re: Quaife ATB Diff for TS Alfas

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Thats a standard open diff next to the Quaiffe, not a Q2, just in case anyone is wondering.
Ahh sure you can see that pud
 
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Re: Quaife ATB Diff for TS Alfas

Quote:
Originally Posted by alfasud.ti View Post
The gearbox has to come off the car and be taken apart in order to change the diff. The diff is inside it and not in a separate compartment as is the case with V6 transmissions.

And the Quaife diffs have a TBR of approximately 3:1.

Here is a pic of mine with the crown wheel and bearings fitted, next to the std open diff: http://img242.imageshack.us/img242/5...2009055sj3.jpg
bugger that then not having one if i cant fit it myself
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Re: Quaife ATB Diff for TS Alfas

it's beautiful,

how do i trash my gearbox so i have an excuse to fit one?
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