Quaife diff installation question

Hey guys, I about to install the half-shaft in the new Quaife diff QDF12Q (2006 Porsche Cayman S) . OEM ones come with snap-rings at the end (see picture). I would like to know if I have to reinstall them in the new diff or not, because there seems to have no place for the rings to go. Thanks.

New Snap Rings must be installed, confirm by Quaife

Just a question about LSD's in the current state of tire grip. Are you intending on using your LDS for around town and other hwy issues, like snow, or lack of traction due to slippery roads? Or for the track. With the grip from 275/35/18 RE71R's in the rear, I find that I cannot get these tires to slip on the inside wheel, even coming out of tight corners in an autocross setting. In other words, trying to break lose the inside tire is just not happening with my car, not enough midrange torque. I can change the slip angle of the car using these tires though. The same issues can be applied to breaking as well as I am getting two different rear brake ducts (997 Turbo which is in front of the axle directly on the rotor, and GT2 behind the axle on the caliper and rotor) to reduce heat, keeping the car going straight and even more so in trail braking. Keep in mind that I have Olin coilovers and Tarett GT swaybars, so I prevent weight transfer as much as possible. I am running the car pretty low to the ground as well and have -2.5 camber in the front and rear with Tarett Cup lower control arms. Where is the advantage of the LSD for you?

It will be for street use mainly. I had a S13 before as well as other RWD cars. My S13 had a open diff just like the Cayman . I installed a Torsen diff from an S15 and notice immediately the difference when I was breaking the tail loose in corners. I drive my car aggressively on the streets. Here where I live, there's no track around, but the roads are twisties. I had a 350z too, which had a VLSD. The behaviour of the Cayman with an open diff, is far from these car. Had more control with them. Feels like my S13 with the open diff. Hard to get grip from both wheels at the same time. I want it to be more predictable.

If you are talking about drifting, I totally agree. But in my use, spinning both wheels is really slow and out of control as the slip angle is way off for the traction of the tires. The RE71R's are just so much more stickly that it changes the way you drive. Much much more aggressively into the corner, through the corner and especially coming out the the corners. Linked corners as well, the tires just stick. Some guys says too much, they do not like the feel and would rather slide around more. Not me, quicker is better in my view. Went on a PCA tour with 55 Porsches divided into 4 groups. We had 2 way radios to keep the group together. Out to the country roads where you could put your throttle to the floorboard, I was able to stay with a lot of high HP Porsches with my tires and suspension. Granted it was not a race, but from the sounds of the motors, you could tell with guys were on it. Again, no long burnouts coming off the corners from the inside tire, just traction down the road. So I am addicted to the sticky compound tires. Using them way too much for everyday driving, but I get used to the way they work, so am reluctant to switch back to my Michelin PSS's on OEM wheels. With Michelins PSS's, I could use a LSD, but they also slide the front tires way too much from the understeer of the car. I rebalanced the car with the adjustable swaybars to compensate for the understeer, which caused the rears to spin more. You get the idea, So I am thinking about a way to wear these out so I can get a set of Michelin 4S 's in the largest size that will fit my OEM rims rather than another set of RE71R's because the Michelins PSS are much quieter. Like 255/35/18 front and 275/35/18 rear. Maybe they will be close to the stickness of the RE71R's which are exactly the same size, but mounted to race wheels.

@Kevin_s13 what transmission does/did your 07 cayman have in which the Qdf12q fits. Thanks

QDF12Q Quaife Porsche Cayman S ATB Differential I have the 6 speed manual transmission

I ordered the Qdf15q which should fit my 06 cayman S tiptronic! Guess what, it doesn’t! Not in a long shot for starters the drive shaft splines need to be machined shorter, and even then the atb it self interferes with the trans internal housing. I call quaife and they say well not all Porsche transmissions are the same it s my responsibility to check if it fits before ordering!