Geoff, if I had the option to get one from the factory, I would do it without a doubt.

Enjoy the new GTS!

 

Geoff, the OEM LSD that will come on the Carrera GTS will last you maybe 5 DE's..it depends but give or take.

I have this LSD in my 09 Carrera S and it is now shot. For the 1st few track days in this car I could tell the LSD was helping but the weak clutches in the OEM unit have given up and my dealer is not helping out under warranty. However I have the internals for a LSD on my car and am waiting for Guards or GT Gears to come up with a retro-fit solution.

 

To restate, you are saying go for the factory LSD, understand is it not up to hard running but then all you are doing is replacing some of the wear parts with Guards (etc) parts (cheaper than factory stock with full aftermarket LSD). Is this correct? (or are you saying go aftermarket)

Thanks for the info.

Geoff

 

Does the warranty cover the wear on this item?

 

That is what I would do. Also make a call to Guards and GT Gears and ask for there opinion. I am not sure what is involved to instal a LSD if the car did not come with a LSD from the factory.

 

Awesome thanks for all the help.

 

From what I understood from talking to Matt from Guard Transmission is for AutoX TBD is better, for DE/Racing LSD is better. Matt said GT is making the TBD for Quaife.

TBD works only under acceleration, while LSD works under both braking and accelerating.

Hope this helps

 

here is a summary of the response from Guards:

- No PDK 997.2 LSD in the near future, so if you want one get one from the factory. PDK is more HPDE versus racing, there is only one PDK they know of being raced in NA and they are focused on racing.
- They are working on a repair kit for the factory LSD which they are estimating availability this Spring.

So if you are getting a 997.2 PDK and want an LSD seriously consider the factory one.

Have not heard from Quaife will post what they say when I get it.

Geoff

 

hi geoff

did your gts pdk come with lsd option? mine didnt come with it and i wanna get one aftermarket... do let me know how it developes...

thanks

 

Hopefully the newer lsd's are more robust then the ones in the 997.1 cars. They don't hold up to well. I have the quaife and love it.

 

I've read some posts by Matt at Guards stating the factory .2 LSD's are made by Aisin and are quite decent.

 

About how many hours for installation on a 997.1 manual S?

 

Quote:
Originally Posted by tcouture
Is the Porsche LSD option a true Limited Slip Differential (lockup on acceleration and deceleration) or is it a Torque Biasing DIfferential (lockup on acceleration only)?

I believe some track junkies have been reporting that the factory 997.2 LSD is not strong enough for heavy tracking (mdrums?). That would probably point more to a TBD type in this case. I would look into that if I was looking at that factory option.

Guard transmission has a lot of info on their website regarding TBD/LSD options. It is a very interesting read one way or another. Nothing wrong with being informed.

http://www.guardtransmission.com/tech_faq.html

I am looking at adding a LSD to my car for the track so I would like to hear other people's opinions. To the people who went with Quaife, did you also look at Guard? If you did, why did you go that way?

Thanks,

T.
The factory LSD is a clutch type LSD. Quiafe does not make an LSD, even though their own marketing tells you otherwise. They make a TBD (torque biasing differential), which actually has no limit to how much wheelspin they allow and act like an open differential in a zero traction situation, such as when you lift a wheel on a tight turn. Though I suspect from your post you already understand this, and mention it more of the benefit of other readers of this thread.

The factory unit is made by Aisin, which is different than every other Porsche gearbox in the last decade. All other Porsche gearboxes are made by either ZF or Getrag. This has pluses and minuses. If you make your way over to the GT3 forum you'll see a thread called LSD Buster talking about the problems people have with the LSD in the Getrag gearboxes (LSD actually made by GKN). The Aisin LSD in the 997 works pretty well from the feedback I get from my customers. For a street car that sees some DE use it's perfectly adequate.

However, I wouldn't really want to be using it in a racing environment. It's just not aggressive enough. Every 997 Carrera running in Grand Am has removed the factory LSD and replaced it with our unit. To my knowledge, none of them use a TBD because they don't lock on braking, as you mentioned. In PCA club racing there's a mix of our LSD, our TBD and the Quaife TBD. TBDs are ok for club racing but they will never be as fast as a true clutch type LSD for road racing.

Thanks for the compliments on the website. It's newly revised and still a work in progress. We've got more content we're going to be adding to it in the coming months but it had been non-functional for a while and we felt we had to get something back up to start generating google hits and providing information to our potential customers.

Regards,

Matt Monson
Guard Transmission LLC

 

Are there any "issues" with adding a a LSD with PASM. I have a 997.1 C2S.

Thanks

 

Interesting. First time I've seen this thread. I'd like to clarify a couple of things mentioned in this thread.

1. GT = Guard Transmission. We are one and the same. GT is our brand of products. Guard Transmission LLC is the name of our company. There was a reference or two above, albeit 2 years old, to contact BOTH of us as if we were two different companies.

2. No, we do not make the Quaife TBD. They are a competing brand and something that we feel is not as refined and as durable as our on GT label TBD. I recently saw one of our customers make a remark on another forum that I will repeat here FWIW. The context was a guy had broken his Quaife and was asking others about their experience in using the warranty that Quaife puts on it. The guys said," Quaife puts a lifetime warranty on their products. They will stand behind the product when it breaks, and you will need the warranty. Every few years you'll need to send them your differential for repairs. Guard puts no warranty on their products. Their products need no warranty."

3. I think it's clear, but I am going to restate this for clarity. Turbos and GT3s are made by Getrag. 997 Carrera C2 and C4 6spds are made by Aisin. The PDK is off on it's own. What we make is both an LSD and a TBD for the Aisin gearbox. We are in the process of developing a rebuild kit for the PDK factory LSD. We will not be making an LSD for the PDK in the foreseeable future.

If there's any other questions unanswered please post them up. Now that I've replied to this thread, I'll get notifications when someone chimes in and can come back and contribute to the conversation.

Regards,

Matt