LSD installation into 996TT

[XPGT2]

Originally Posted by GTgears Hello Peter, I've seen your posts and will be watching you. And just for the record, I in no way betlittle your achievments at One Lap when I talk about it being a different usage within a range of applications. While it's a different kind of event, it's clearly still "real" racing in my book. In fact, we're involved with a car that will be out there next year. I'll look for you and try to say hi. Also, if you decide to regear your car down the road let us know. While we're best known for out LSD's we do make gears as well. Steve at Rennsport Systems is a dealer and can help you run charts and analyze what might make an already fast car even faster. Steve is my Guru, even if he is on the left coast. Are you sponsoring a car or are you going to actively participate in the 2010 One Lap. I know you weren't knocking our One Lap run. I also know there is a big difference between 3 hot laps and Enduro's. I have great respect for Guards products. The GT2 gearing isn't bad. If I was still running my GT3 the next mod would have been gears. Peter

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[MrWhite]

Originally Posted by Prche951

good question and I have no clue but hope someone can answer as I am going to do this mod soon as well.

Question for you, however. How did you come by which LSD you will use. Carbonetics, Guard, Quaife and a few more, so just wondering.

Seems we're a lot of people with a lot of interest in getting a good LSD into the cars.

I drove Nismo and KAAZ (Nissan 350Z, grip and Formula Drift) before going Carbonetic. Those were 1,5way resp 2way, also ran at different settings levels, from 60% (grip) - 100% lock (drifting). On the 1,5way this meant 60/30 and 100/50 obviously.

I then got a Carbonetic diff and drove it several months at several events and I am never going back to metal diff again.

Difference is huge. The Carbonetic is stealth when moving around on the lot, loading on trailer, say pit driving/parking etc. This would be good for street and is a great perk.

Peformancewise - the traction improvement was huge. The engagement is un-detectable = absolutely no loss of lateral grip in a turn due to a "clank" engagment, whether mid-turn accel or at throttle off corner entry.

The response is directly related to your throttle actuation - quick and snappy and you'll get a fast lockup (but it will never come on as a switch, it is a perfect smooth transition). Hit the pedal smooth and gradual and it will lock gradually/softly with no noticing, car just grips.

After install I broke it in, changed oil, ran again a bit, changed oil. Since then we ran it with usual intervals (the diff gets hot so pretty much each practice + event, then new oil). I have noticed no difference in performance.

Those are the reasons I want a Carbonetic diff in my 996TT too, silent, smooth and incredibly efficient when it comes to traction (rain or dry) which I will need since car is becoming 2WD very soon. And I still want to keep the 996TT as daily driver and not have noise and jerkiness.

Summarizing comments, it seems I may need different output flanges(?) This seems odd though, as the GT2 and 996TT output flanges have identical same partnumbers. So flanges should only need to be changed, given the diff pumpkin is not compatible with the GT2 or Turbo flanges. If that is the case, most serious diffs come with fitting flanges - correct (me if I am wrong here)?

[Mikelly]

This is really good timing as we're getting ready to purchase a diff for our car, since the trans is out and being rebuilt.

Mike

[cjv]

We have used a Porsche billet LSD which is used on the RSR's. I have not heard on this forum of anyone else using this unit.

[MrWhite]

Originally Posted by GTgears

Hello,
Sorry for the hijack, but just saw a few points I wanted to clarify. With respect to the install of your Carbonetics LSD all you really should need is fresh bearings and the proper shims to adjust the ring gear. It should only take a few hours for the shop to get it in and get it right.

No probs seems a useful thread for many!

Thanks for the info reg the install!

[GTgears]

Originally Posted by XPGT2

Steve is my Guru, even if he is on the left coast. Are you sponsoring a car or are you going to actively participate in the 2010 One Lap.

I know you weren't knocking our One Lap run. I also know there is a big difference between 3 hot laps and Enduro's. I have great respect for Guards products. The GT2 gearing isn't bad. If I was still running my GT3 the next mod would have been gears.

Peter

Hello Peter,

The car actually pre-dates my purchase of Guard Transmission, so it's not even a Porsche. My previous business, in addition to Porsche transmission parts also did Subaru stuff. The car is a 2002 WRX with a 3.0l H6 swap in it that's been converted to twin turbos. The irony is that the gearbox in this Subaru, which I purchased from Guard Transmission is a straight cut dog box 5spd and LSD's from our gearmaker. So, while I am the project manager on the build and prep of the car, it does technically contain GT products and you could say that it's sponsored. Whether or not I co-drive remains to be seen. It's going to be a question of timing and work. In addition to One Lap the plan is to take it to the Texas Mile, and potentially the 25 hours of Thunderhill. It may also be used as a spring board to introduce a new line of Subaru gearparts to America.

[GTgears]

Originally Posted by cjv

We have used a Porsche billet LSD which is used on the RSR's. I have not heard on this forum of anyone else using this unit.

I suspect that it's a combination of the cost and that's it's not that easy for anyone off the street to pick one up. Over time as top teams take them out and replace them, I suspect they may become more available and a more cost effective solution. However, for most street guys they are just too aggressive of a differential. For a dedicated track car, however, they are a top notch product.We can rebuild them and back them off a bit for the street guys, just like we do with the 996tt and GT3 street LSD's with the cast bodies. Pretty much all of our components are cross compatible with factory parts. In fact, there's a member here who will be shortly publishing an "article" about replacing his stock GT3 internals with ours and his impressions once installed. Watch for it in the GT3 forum.

[GTgears]

Originally Posted by MrWhite

No probs seems a useful thread for many!

Thanks for the info reg the install!

You are welcome. There seems to be some confusion around the output flanges needed with an aftermarket LSD. There's not a differential on the market that comes with flanges supplied, that I know of. However, the only guys who have an issue with this are the guys with the 996 chassis C2's and C4's. All the TT's and GT2's and GT3's use a bolt in flange like earlier G50 variations did. It's just those 996 Carreras with a circlip attachment that are the outlier. Why Porsche used a different flange on those cars when it was still a G50 based gearbox is beyond us. If it ain't broke, don't fix it. For some reason Porsche decided they needed to on that car. But it doesn't effect any of the members of this forum who are looking to upgrade their TT with an aftermarket LSD.

[XPGT2]

Originally Posted by GTgears

Hello Peter,

The car actually pre-dates my purchase of Guard Transmission, so it's not even a Porsche. My previous business, in addition to Porsche transmission parts also did Subaru stuff. The car is a 2002 WRX with a 3.0l H6 swap in it that's been converted to twin turbos. The irony is that the gearbox in this Subaru, which I purchased from Guard Transmission is a straight cut dog box 5spd and LSD's from our gearmaker. So, while I am the project manager on the build and prep of the car, it does technically contain GT products and you could say that it's sponsored. Whether or not I co-drive remains to be seen. It's going to be a question of timing and work. In addition to One Lap the plan is to take it to the Texas Mile, and potentially the 25 hours of Thunderhill. It may also be used as a spring board to introduce a new line of Subaru gearparts to America.

Matt,

Sounds like an awesome car. Can't wait to see it. I tell people the One Lap is the most fun I have had with my clothes on. But then again I have never run Daytona 24 or any other big or little race event. To old and slo.

Peter

[GTgears]

That's why I think the 25 hours of Thunderhill is such an awesome event. You get top teams from around the country and you get punters like myself who can still go run it. As long as the car stays together for the duration. I do some triathalon stuff and tend to impart my philosohpy from there onto my motorsports. It's about finishing. Period. I don't care where I finish. I just want to get it done.

[Mad Ness]

For the G50, does the LSD and transmission share the same oil?

Oil recommendations for Quaife LSD?

thanks

[MrWhite]

Originally Posted by GTgears

You are welcome. There seems to be some confusion around the output flanges needed with an aftermarket LSD. There's not a differential on the market that comes with flanges supplied, that I know of. However, the only guys who have an issue with this are the guys with the 996 chassis C2's and C4's. All the TT's and GT2's and GT3's use a bolt in flange like earlier G50 variations did. It's just those 996 Carreras with a circlip attachment that are the outlier. Why Porsche used a different flange on those cars when it was still a G50 based gearbox is beyond us. If it ain't broke, don't fix it. For some reason Porsche decided they needed to on that car. But it doesn't effect any of the members of this forum who are looking to upgrade their TT with an aftermarket LSD.

Nismo does send flanges with their diffs.... but won't fit a Porsche!!

I'll come do a night stint at Thunderhill if you get tired.

[XPGT2]

Originally Posted by Mad Ness

For the G50, does the LSD and transmission share the same oil?

Oil recommendations for Quaife LSD?

thanks

Yes, it is a transaxl.

For a Quaife LSD I would stick with the Porsche OEM fill. No need to change.

Peter

[Mad Ness]

thanks peter

[silver]

Matt,
I have enjoyed reading your posts in this thread and want to thank you for your honesty, sincerey and knowledge regarding these diffs. Most folks would not have been as kind with their competition. You are a gentleman and an enthusiast and I can tell you guys know your stuff and stand behind what you do. Thanks for your contribution to this forum.