Retrofitting a Q2 to an existing Alfa

Originally Posted by opankar

Is it possible to fit Q2 dif to 155 TS 8v gearbox?
What else apart from the diff should be changed?

It won't fit, only on a 2.5 v6 with a 6-speed gearbox (of the 156 v6) you can fit a Q2 diff.

You will need to fit the Quaife diff. Apart from the diff ifself you won't need to change anything, but you might want to change some bearings as you took apart some of the drivetrain anyway.

Originally Posted by Squadrone Rosso

Prodrive built the Focus RS's (not a lot of people know that). I had a tour there recently where all was explained

The reason that the RS was so "snatchy" to drive was because of the standard McPhearson suspension. The fella from PD said the issue does not happen on cars with double wishbone suspension

Cheers,

Probably stating the obvious, but assuming you could even fit a Q2 diff to a 6sp V6 GTV/Spider (could you?) then it might not be a good idea?

This guy says that Q2 would not be good on Macpherson-equipped cars as well..

http://www.youtube.com/watch?v=xh34XAPqSXE

It would fit to a 6-speed V6 GTV/Spider.

I had a Quaife LSD in my old Sud and it worked very well.
Some strange reactions through the steering but remember I had a very quick rack and no powersteering so it was hard work.

Originally Posted by David C

It would fit to a 6-speed V6 GTV/Spider.

I had a Quaife LSD in my old Sud and it worked very well.
Some strange reactions through the steering but remember I had a very quick rack and no powersteering so it was hard work.

Hmm.. this is sounding more interesting all the time. I'd be interested to know more about why Prodrive think MacPherson struts cause the problem. Then I'd be even more interested to see how Renault have sorted that for their latest Megane R26. It has an LSD and MacPherson struts, and EVO magazine love it..

Theres nothing wrong with Mcpherson struts and LSDs, that Q2 vid is promotional, of course they are going to talk up the Alfas strengths and rubbish competitors, end of the day a lot of good cars do very well with a mac pherson setup and funky diffs like the renaults and fords plus lancer evos to name but a few. I wouldn't give it a second thought, get it fitted and form your own opinion, its not as if the GTV is lacking from steering kick back just from the torquesteer whats a little bit of diff action going to do to worsen it, not much i'd reckon when stacked up against the traction benefits.

Originally Posted by sandys

Theres nothing wrong with Mcpherson struts and LSDs, that Q2 vid is promotional, of course they are going to talk up the Alfas strengths and rubbish competitors, end of the day a lot of good cars do very well with a mac pherson setup and funky diffs like the renaults and fords plus lancer evos to name but a few. I wouldn't give it a second thought, get it fitted and form your own opinion, its not as if the GTV is lacking from steering kick back just from the torquesteer whats a little bit of diff action going to do to worsen it, not much i'd reckon when stacked up against the traction benefits.

I very much like your thinking.. Wonder if anyone has fitted a slippy-diff to a GTV or Spider?

I'm heading UK this July so I'lll probably pick one Q2 up. Can I ask it fits 156GTA without problem?

Originally Posted by ABYSS

Can I ask it fits 156GTA without problem?

Yes and yes.

Now about McPhersons and Q2 what i've understood is that there will be more steering wheel tugging and torque steer than with double wishbones, but other than that the Q2 will work fine. The Focus RS is an example of combination of McPhersons and Torsen-type diff. They say that it is very good on the racetrack but a little too aggressively setup for public roads, don't know how much of this is due to the McPherson/Torsen combination.

Hi,

does somebody know the partnumber for the differential (Q2).
Maybe the supplier in europe aswell?
Torsen did not respond to my mail.
I have asked all alfa garages in Hamburg but they got no clue about Q2, it is even not in their catalogue yet to find a partnumber.
They say it is not possible to fit Q2 on a GTA

cheers

selcuk

That's not what people here are saying.... Did they tell you why not?

Originally Posted by selcuk

Hi,

does somebody know the partnumber for the differential (Q2).
Maybe the supplier in europe aswell?
Torsen did not respond to my mail.
I have asked all alfa garages in Hamburg but they got no clue about Q2, it is even not in their catalogue yet to find a partnumber.
They say it is not possible to fit Q2 on a GTA

cheers

selcuk

Check previous sides in this thread. The numbers are there. The Q2 have been retro-fitted in some GTA's araound Europe. Read ALL pages in this thread and you will find the answers.

Hi,

i have recieved a reply from Torsen saying that they handle only the US market and they have no aftermarket bussines in Europe. So, whatever Ive finally found a garage where i can purchase it. The only problem is when...
Most of the mechanics (Alfa) i have asked here said that the gearbox would be a different one. I think they don´t know really the differces in detail between the cars.

Cheers

Selcuk

The 156 and JTD gearboxes are structurally identical. They just have gears with different number of teeth.

As to whether the Q2 fits the 156GTA, I would bet my life on it because i have driven one (Retrofitting a Q2 to an existing Alfa).

The AHM Motorsport site bitchlinked previously in this thread states the Q2 diff is not for the 2.4 JTD......

I thought it would fit the 6 speeder fitted to the 20V Mjet 156's ??????

Lee

Hi all,

From what I've read here so far, the Q2 will work for my car too (147 1.9 JTD 8v).
Anyone has done some testing regarding the improvments to the 0-100Km/h time for example? I mean, how much will help this Q2 for that kind of stuff? My remaped 147 wants to know

why dont you fit it and find out?

Originally Posted by ukoldschool

why dont you fit it and find out?

I will be trying to do that as soon as I can...

Hi Guys
The Q2 does fit GTA S all the 1.9 8v or 16 jtds
as ive fitted them .
Im not sure about the 2.4 JTDs as the gearbox/diff look
very differant on eper ?
but looking at 2.4 gear boxs when the cars come in
the casing diff housing etc looks the same as the others
so im not sure?

2.4 10V gearbox is the same except 20V box is GM box.

My Q2 dif has just arrived (held it in my hands this morning )

Fitment: this week Testing: directly after on the Nurburgring !

be good to see how you find it on the track, I am still not used to how the car cuts into the corners now, I need a lot more practise, when you have done 40k miles in a car that likes to understeer a bit when pushing on, having it now pull you in tight round the odd corner where you expect some front end push is a little unnatural find myself in a corner with too much lock on having to unwind it a little which is obviously not ideal as its not smooth, I'll get used to it eventually, just go steady in your testing.

I believe that the only thing to watch out for is having both wheels spinning, in which case you may know that it is happening a little too late. But at such an open track as the Nuerburgring i wouldn't worry about that.