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Old 24-12-13 Thread Starter
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Alfa Q2 and other diffs

Right i here a lot of mention of Q2 diffs on the GTA

I have a few questions..
1 They werent standard fitment to GTA so where they just an option when new?
2 How can you tell if the GTA your looking at has one?
3 Where they common as an option
4 Any other alfas fitted with one as standard
5 what type of limited slip are they.. plate or torsion gripper type
6 does anyone else make an aftermarket LSD for the box..
7 would the aftermarket type have any advantages other than being brand new

thanks
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Old 24-12-13
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Quote:
Originally Posted by maxiboy wales View Post
Right i here a lot of mention of Q2 diffs on the GTA

I have a few questions..
1 They werent standard fitment to GTA so where they just an option when new?
2 How can you tell if the GTA your looking at has one?
3 Where they common as an option
4 Any other alfas fitted with one as standard
5 what type of limited slip are they.. plate or torsion gripper type
6 does anyone else make an aftermarket LSD for the box..
7 would the aftermarket type have any advantages other than being brand new

thanks
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Old 24-12-13
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Some gt and 147 diesels fitted with them, no way to tell from the outside if one was retrofitted, iirc.

There's also the Quaife. Check the Autolusso website.
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Old 24-12-13
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Quote:
Originally Posted by maxiboy wales View Post
Right i here a lot of mention of Q2 diffs on the GTA

I have a few questions..
1 They werent standard fitment to GTA so where they just an option when new?
2 How can you tell if the GTA your looking at has one?
3 Where they common as an option
4 Any other alfas fitted with one as standard
5 what type of limited slip are they.. plate or torsion gripper type
6 does anyone else make an aftermarket LSD for the box..
7 would the aftermarket type have any advantages other than being brand new

thanks
1. No, they were released for the GT after the GTA had stopped production, and subsequently fitted to other Alfa by both Alfa Romeo and enthusiast independent garages. http://www.evo.co.uk/carreviews/evoc...lfa_gt_q2.html
2. This is very subjective, without taking the gearbox to bits the only way is by driving the car knowing how a torsen style differential should react to driver inputs.
3. See 1.
4. GT Various versions, later cars had an electronic Q2 which used braking of the inside front wheel to emulate the function of the mechanical Q2
5. Torsen
6. Quaife, can be purchased via autolusso
7. Might save you having a blown diff, the standard open diff is a known weak point and often takes out the rest of the gearbox when it lets go.

Nero Fuoco 147 Lusso - Bianco Nuvola 147 GTA - Carbonio Brera SV - Azzurro Le Mans GT 1600 Junior
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Old 24-12-13 Thread Starter
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thanks ghostdog and others done a bit of further research myself too...

6 gripper trans-x and gearboxman don,t make diffs for the F40 gearbox .. did vauxhall fit LSD,s to any F40 boxes

plus is the vauxhall F40 box a direct replacement
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Originally Posted by maxiboy wales View Post
thanks ghostdog and others done a bit of further research myself too...

6 gripper trans-x and gearboxman don,t make diffs for the F40 gearbox .. did vauxhall fit LSD,s to any F40 boxes

plus is the vauxhall F40 box a direct replacement
No idea but interested in the maxi, post up a thread about it
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Old 24-12-13 Thread Starter
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Old 26-12-13 Thread Starter
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Any one know who made the Q2 fiited to the alfa,s was it developed in house or an outside supplier
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Old 28-12-13
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I believe it's in house. It can be checked by pulling a shaft and looking inside the diff. It has no shaft which holds the planetary gears. Quick to do on a ramp but obviously you can't do that to a potential buy. It is noticable. When you have a go in mine you can feel what it's like with one.
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Old 28-12-13
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Any one know who made the Q2 fiited to the alfa,s was it developed in house or an outside supplier
Take a look at the tab Applications.
TORSEN
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Old 28-12-13 Thread Starter
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Thanks all
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We had a Q2 on our V6 GT then got an early & free trial upgrade to a Quaife thanks to Ned at Autolusso.

Despite the Quaife's reputation for fierceness, it's less harsh than the Q2. It's also a lot smoother & quieter at low / manoeuvring speeds. A brilliant upgrade
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Old 28-12-13
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I just have Q2 fitted on my GTA and a really good upgrade. I have chosen for Q2 rather than quiafe for reason of Q2 being smoother.
You can very easy tell whether it is installed to the car: approach roundabout (preferrably wet, but not necessary) and leave it with much throttle:
- no Q2 = understeer
-Q2 = nose will dive into the steering direction (toward apex) making the turn tighter
No mistake possible :-)
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Originally Posted by ArieB View Post
I just have Q2 fitted on my GTA and a really good upgrade. I have chosen for Q2 rather than quiafe for reason of Q2 being smoother.
You can very easy tell whether it is installed to the car: approach roundabout (preferrably wet, but not necessary) and leave it with much throttle:
- no Q2 = understeer
-Q2 = nose will dive into the steering direction (toward apex) making the turn tighter
No mistake possible :-)
In my experience, the Quaife is much smoother & quieter. The Q2 is noisier & more agressive.

The results are the same though
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Old 28-12-13
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noisy Q2? Haven't you preloaded it wrongly?
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noisy Q2? Haven't you preloaded it wrongly?
Not noisy in general use, just a bit rough at manoeuvring speeds.
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Old 29-12-13
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Either way LSD is better than no LSD
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Old 29-12-13
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Originally Posted by Squadrone Rosso View Post
Not noisy in general use, just a bit rough at manoeuvring speeds.
Absolute rubbish ,I have fitted a LOT of Q2s and take care to shim them correctly they are completely silent in operation

John
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Absolute rubbish ,I have fitted a LOT of Q2s and take care to shim them correctly they are completely silent in operation

John
I did say "in my experience", John.

Are you suggesting that Autolusso did something wrong when fitting my Q2 as I'd put good money on them knowing their onions when it comes to Q2 diffs?

I also drove a number of diesel Q2 cars with factory fitted diffs. Had the same slightly rough / notchy feel at crawling speeds.


As Joss says, both are great. In fact, either is a must IMO
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Old 30-12-13
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My first Q2 was never noisy (fitted at Autolusso Feb 2008, 18 months before I was employed there), but I have driven others that have made a little noise at slow speeds before (Alfa GT JTD Q2, a couple of them). I don't think it is worth considering.

Q2 vs Quaife, I owned one of each up until a few months back, let me say that any difference between the two is not really worth considering when you are a buyer who currently has a standard diff. Just imagine them as the same thing, and find the best price you can for whichever diff. OK the Quaife has a lifetime guarantee as opposed to 12 months for the Q2, and the Quaife is clearly better made as it is machined from billet, but neither of those facts really matter as I've never known a Q2 to fail and once either diff is fitted inside your gearbox you can't see how much nicer the Quaife looks.

As far as I know, no-one is selling a Q2 kit cheaper than our price for the Quaife kit which is 550 inc VAT. By kit I mean diff, pair of bearings, pair of O-rings and pair of driveshaft seals. In addition you will need gear oil, and possibly a shim of different thickness, but you won't know which you need until you start fitting it. Mostly they are correctly shimmed from factory but some of the Alfa recon gearboxes I've seen have not been shimmed correctly to start with.

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When I had my v6gtv when into Nedd for service and he lent me his gta which had the q2. By the time I had driven it home I phoned Ned and asked him to fit one, car drove like new best, at the time 800 I spent on her IMHO

Mj
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Old 03-01-14
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Squadron Rosso, I think I know what your saying totally, mine is a little like it. But absolutely love it, I have a large roundabout called sun and sands near blackheath, perfect for testing the Q2
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Squadron Rosso, I think I know what your saying totally, mine is a little like it. But absolutely love it, I have a large roundabout called sun and sands near blackheath, perfect for testing the Q2
I know that round about very well, shooters hill road. small world!
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Old 11-01-14
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Quote:
Originally Posted by maxiboy wales View Post
Right i here a lot of mention of Q2 diffs on the GTA

I have a few questions..
1 They werent standard fitment to GTA so where they just an option when new?
2 How can you tell if the GTA your looking at has one?
3 Where they common as an option
4 Any other alfas fitted with one as standard
5 what type of limited slip are they.. plate or torsion gripper type
6 does anyone else make an aftermarket LSD for the box..
7 would the aftermarket type have any advantages other than being brand new

thanks
1. No and No.

2. You either have to know how they handle normally so you can compare or popr the driveshaft and visually look.
3. See 1.
4. Some 156 Q4, 147 Q2 and DC, GT Q2 and in some markets the Blackline. All are 1.9 JTDm.
5. Torsen.
6. Quaife (hence the Q in Q2) make an updated TorSen and an LSD.
7. None.
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Old 17-01-14
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Originally Posted by Smellysocks View Post
6. Quaife (hence the Q in Q2) make an updated TorSen and an LSD.
Q in Q2 has absolutely nothing to do with Quaife. Originally it was named for the 155 and 164 "Quadrifoglio 4" meaning Cloverleaf 4 ( Alfa Romeo 164 - Wikipedia, the free encyclopedia ), denoting the 4 wheel drive system and most powerful engine in the range. It had a Torsen diff at the rear but this diff was miles different from the Q2. Q2 is just a continuation of the Q designation.
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