Quaife differential

[marcjml]

Guys, i might have the chance to buy 156 GTA Quaife ATB Helical LSD differential for around 400-500ish

is it worth it or will the Q2 be just as good?

thanks

[Squadrone Rosso]

TB will be best placed to answer this but from what I remember, the Q2 is more suited to everyday road use.

[NineOneSix]

the Q2 is based on the quaife as they are both torson style diffs, so one will feel the same as the other, the quaife comes with a lifetime warrenty though iirc

[Trailbraker]

Q2 are based on the same common principal.
The Q2 diff is designed and made by Torsen, and the Quaife ATB diff by Quaife, but they are direct competitors and could in theory have different setups (torque bias ratio etc).

From my driving of both on a GTA I personally couldn't tell much difference, and if the Q2 is still 200 quid or so cheaper than the Quaife I would certainly recommend that. I dont actually know if the Quaife is any better in fact. At Mondello, If anything, I would have to say that while the number of laps were limited I suffered more inside wheelspin with a quaife than with a Q2, but at the Ring in another GTA (PeterK's) the Quaife (from Madeno Racing) felt perfect.
I am putting this down to the higher ride height of the car that suffered more wheelspin so its not really a direct comparison with identical cars, but my temptation is to give the Q2 the edge for a GTA.

I have driven a lot with the Q2 on my supercharged GTA, and it performed very well, and took way way more power than it was designed to reliably.
I also used a quaife on 2 standardish GTAs for several laps track use (at Mondello, and the Ring), they felt pretty much identical to the Q2, but I didn't get to test the Quaife on pure road use - I'm sure its the same as the Q2 in that regard - both a bit squirmey on uneven surfaces..

Coincidentally I have recently had a Quaife diff fitted to my (shared with 2 others) Autotest starlet, and wow that made an enormous difference for very tight turns (..Mind you thats something the GTA cant do!)

Heres a clip, of our instructor driving our Autotest car, in VERY slippy conditions, and our Autotest tyres aren't meant to be very grippy but the traction off the line and around corners as amazingly improved.
Without the Quaife diff, wheelspin would be very very hard to control in those conditions..

Autotest Practice Mondello 14th Dec 208 Rocket Ron- Video

[Phil_D]

Quaife and q2 are pratically the same if you want a proper diff you need to go plated, try gripper as they make a proper plated diff for gta's also autodelta have their own plated diff.

[NineOneSix]

thing is though for a road car a plated diff is impractical as they are quite high maintenance, replacing plates tensioning them etc etc

[Chris155]

I have a quaife in mine and on wet bumpy b roads it scares the crap out of me.... but then I've not tried a Q2....

[jwyatt]

I can't believe there would be any difference in feel between any of the torsen diffs available (such as the Q2 and the Quaife). A plate-type diff would be another matter. I would expect differences in feel between a Quaife and a Q2 car, if observed, to be down to other factors such as the suspension setup/geometry, tyres, condition, etc. In my view the Quaife is basically a better made version of the Q2, though the Q2 itself has proven very strong in the hands of some of the guys on here with 3.7l and supercharged cars, so hardly seems a worry!

[v6junky]

I heard the Quaife was 'lumpy' in comparison to the Q2. I also heard the Q2 was not rated above 200 bhp but that could just be AR covering their bum holes.

[jwyatt]

A drivetrain component would be rated to a torque, not a power, rating - the fact the Q2 can handle the high (by petrol standards) torque of the 1.9jtd was one factor in convincing me it was safe. TB thrashing one with way more power and torque than my GTA will ever dream of, with sticky tyres and a track setup in capable hands (i.e. a hard time for the transmission!) was another...

[v6junky]

Originally Posted by jwyatt

A drivetrain component would be rated to a torque, not a power, rating - the fact the Q2 can handle the high (by petrol standards) torque of the 1.9jtd was one factor in convincing me it was safe. TB thrashing one with way more power and torque than my GTA will ever dream of, with sticky tyres and a track setup in capable hands (i.e. a hard time for the transmission!) was another...

Good point!

[NineOneSix]

besides if they were rated at 200bhp the GTA boys are screwd

[Squadrone Rosso]

Not just the GTA boys EA Don't forget the GT girls

[NineOneSix]