Those of you who put an aftermarket LSD on your 997 (which is probably everyone who has one in the US, but the TTs, I believe), what LSD did you go with?
And if you don't mind, I'd be interested to know the ballpark for the parts and install.
Oh yeah, and would you do it again or would you go with a different one?
Thanks in advance.

 

I beleive most buy/use the Quaifie LSD.
Price to install will vary...most wait until they need a clutch then do it...while you are there a light-weight flywheel may be a good thing.
I may know of a BRAND new Quaifie that is for sale.....fairly cheap!

Stacy

 

I have the Quaife LSD, works very well. The other one to look at is Guards Transmission, or GT is also very common in the Porsche world.

When you put one in, you will wonder why Porsche didn't include one, huge improvement on the track.

 

The LSD you can put it only in 6 speed manual or and to tiptronic ?

 

North

If you had to do it again which LSD would you use? and why?

Also what does an LSD run?

 

The Quaife www site says that the retail price on the 997 LSD is $1866.77. (http://www.quaifelsd.com/applications.aspx) Maybe some discounting can be had?
I assume it's a few hours for the installation?

 

I'm going to throw a second on 04GT3RS's comments. Though some Quaiffe models have a lockup feature making them a better torque biasing differential then say a straight Torsen (no lockup feature) they are not a Clutch Type LSD. Also, when you are dealing with a front wheel drive car, the added driveability and feel you get with a Torque-Biasing/Torsen type differential is a benefit, so it's not to say that clutch-type diff's are "the best always".

It depends on application, you need to be talking about FWD, RWD or AWD and if the latter, which of the 3 differentials you are referring to.

That said, there are not really any wear items in the quiaffe or a torsen, so it's kind of like a forever differential, and its better then a straight open diff (even one that uses multi-channel ABS to apply locking to a wheel to help out the crappy open diff, that is a band aid at best).

In a tradition clutch-type LSD, you have clutch plates and you set a preload (old 944 porsche was I believe around 60%). Most race cars will increase this, but depends on track and useage, but figure more like 85%. Clutch discs wear, so you'll lose your "lockup" percentage through wear, and the differential will need to be serviced (replace clutch packs, reset preload, reset shims to get the right alignment with the ring and pinion), all fine in a race car, but in a street car, that's labor. As to how often, that's all down to use.

Also, on a clutch type diff (not sure if this is true in a quaiffe) you can set a ramp angle for accel and decel, so you can go standard 45 angle cuts, or something more exciting, it's another tune-able feature of the differential.

I agree, if I was going to do it I would rather have a clutch-type LSD in a RWD car (high preload may cause wheel chatter at sharp low speed turns, that's how you know the diff is working). Just understand the differences.

 

While a LSD is a better choice for a full time track car, a street car I think is better off with the Quaife. That is why Quaife is used in a lot of manafactuers cars. First off the Quaife since it doesn't have clutch plates are more durable. You can kill a LSD in one race, this is next to impossible with a Quaife. The factory settings of it's LSD is quite conservative for long life, when you really start geting into aggressive settings with an LSD you can shorten it's life.

I still can't believe Porsche didn't even put one in the car in the first place.

 

Hey, what about the OEM LSD that comes on the 997TT cars? Is it reasonable to consider that part?

 

Hugely expensive...go with Quaife.

Dave

 

I would buy the Quaife again, it has made a huge improvement on the track. The unit cost me $800 (new...Ebay).

 

Maybe we mis-understood each other. I felt the OEM LSD is too expensive. At this price point I would rather have the Quaife or the Guards.

Dave

 

Talk to Guard. They have a hybrid solution where they take a Porsche motorsport LSD housing and use their own Guard friction parts for the most cost effective and robust LSD you can get for the track. Consensus is for AutoX the Quaife is good, but for road courses (DE / racing) the Guard or hybrid is the choice.

 

Doesn't this require some adapter plate to work with the 997S tranny? I also understand that Guard also makes a TBD as well as the LSD.

Thanks for the info..I can assure you that I am not the go to guy on Porsche LSD's. Just enough to hurt myself I'm still learning these wonderful cars after years of Mustangs, SVT's, M3's and now 911's.

When you consider that you can get a Quaife in the $1k range sometimes on Ebay..I know almost bought one, makes you question wether or not to bone up to the extra cost for the LSD. Once again this is something that should have come with this car from the get go...

Dave

 

Resurrecting an old thread...

Ordering a new GTS (with PDK) and considering the diff options. I have search and read about the various TBD and LSD options. Looking to see what folks opinions are. The car will be 95% street use, 5% track (which may grow) in the bay area (no winter weather, mostly dry with reasonable, not great, roads). I see three options...

- Get OEM LSD out of the box
- Wait and get an aftermarket TBD or LSD as an upgrade down the line
- Stick with open diff until I am sure I really "need" a diff upgrade. =)

All opinions welcome. thanks.

Geoff