Retrofitting a Q2 to an existing Alfa

Is it posible to mount a 6 speed gearbox from a V6 to a JTS and then a Q2?
Can someone explain to me if that is possible?
I`m thinking the gear ratios are longer on a V6 gearbox and my car isn`t goin to accelerate as with the normal JTS gearbox.
10x a lot!

Originally Posted by 147owner

Not sure about the temperature issues, but the real issue with the GTA diff is it is not strong enough for the torque of the engine. An example of penny pinching I think. To quote my mechanic after fitting my new Quaife diff, the original diff is "rubbish". And to quote another engineer, "it's not a matter of if, but when it will break." Or to be very definite: "The problem is related to a stress concentration factor at the rear and front of the pinion bevel gear tooth. The von-misess stress at 50% throttle is around 900 MPa (about three times the yield strength of the material)".

Meanwhile, I'm happy to have the Quaife between my wheels....

With all due respect I think you engineer mate talks ******. THere is no possibility that his scenario can be true. Can he show us his calculation and what material properties he used? THere are so many GTA's with standard diff out there and no problem, if that was the case they would fail straight away.

The GTA has the same diff as JTDs...I was running about 400NM on that diff. without a problem...

now I have Q2.

Can somebody tell me the tightening torque for those 12 bolts that hold the gearwheel on the diferential.
It's for the 1.9 jtd.

according to the workshop manual: 77-95Nm = 57-70ftlb

There are at least 15 GTA's running around in South Africa with either stage 1 or stage 2 Glenwood Motors 3.7L kits & no LSD of any kind, none have ever had a problem.Unheard of!
Newalfisti is 100% correct with his comments.
Monstro

Gents,
To those of you who have contributed some descent technical reading on the diff side of things, I commend you, most enjoyable & informative reading, well done!!!
Monstro

Originally Posted by shiny_car

according to the workshop manual: 77-95Nm = 57-70ftlb

Thanks

My opinion is the the diff is rubbish if the Q2 reports the handling improvements in the new model 147 and GT. For other 3.0 V6 owners you may be interested to note that My 2003 3.2 gta has been rebuilt using the same block from a 2001 model 3.0 litre 166. The 3.2 is different with cam, cam followers (lighter and smaller), pistons and crank. The Q2 diff will replace my buggered standard diff which popped under hard accelaration at full left lock around 6000rpm. Sure, it is not normal to drive like this but if a car is built with a motor,power,torque of this magnitude, it would be reasonable to expect the drive train to handle this in a car that has done 40,000 kms I have found over 8 - 147 GTAs in Australia that have replaced diffs due to the same damage as mine plus several others who have just upgraded. The damage includes the spider teeth breaking and invariably punching a hole in the bell housing. My engineer has found you can remove the gearbox with diff without removing the whole engine. All this and I still love the car!!!

What do you mean by: the the diff is rubbish???

And you can tell your engineer that he doesn't need to remove the gearbox as well...

ps:Friendly advice, find an Alfa mechanic not an non-Alfa engineer, he will know how to replace the diff. instead of finding out.

Presume he meant the OEM diff kgb..

The buggered diff was a standard as fitted in original 2003 GTA unit and the one I am replacing it with is a Q2 from an alfa dealer. The removal was by an alfa engineer of over 20 years experience and the process is also adopted by alfa mechanics at alfa dealer ships. Ifthe diff can be removed from a 147 gta without taking out the gear box, I would think that hundreds of mechanics would like to know how.

If the diff broke under my particular circumstance and race car drivers with far better skills than my self express this opinion, then I am quite happy stating the standard diff is crap. If it was good, why did alfa need to find the necessity of fitting the Q2 to the new cars? Can you tell me how to remove the diff from a 147 GTA without removing the whole gearbox as you suggest. I have a great deal of respect for the skills and knowledge of the 3 mechanic/engineers that have worked on these cars and I am sure they would be pleased to know of any short cuts. One of the issues is how to access the bolts for the starter motor among others

i'm very certain you don't need to remove the gearbox to replace the diff on the V6 147GTA/156GTA/GT.

my copy of the GT workshop manual confirms this. other peoples' experiences suggest the same for the GTA's.

AussieNath is doing his own diff-change, as outlined in this thread:

http://www.alfaowner.com/Forum/alfa-...q2-myself.html

you can see the gearbox at its place, ONLY the diff. removed:

http://kgb.alfaromeo-bg.com/147tunin...0/DSC00330.JPG

risking a barrage of use search (i did and it doesnt even find this thread!)

how long does this usually take at a proper garage, im trying to get a quote and the mechanics system doesnt have any box removal times.

anyone got a approx time or quoted time from a garage?

Mangolesits do the Q2s for £180 now !

Can the Q2 be fitted to a 2.2 Brera?