I need to drop a Carbonetic diff into a 996TT.

Is this a straight drop in with removing the crown gear from the open diff and then bolt the crown gear onto the new Carbonetic pumpkin, shim it up, tighten bolts and put it all back?

I have done several LSD installs on other cars, with OEM or open LSD before and they were all done like said above. A full-time Pcar raceshop will do the actual install on this 996TT though, but all I am asking you who KNOW, if there is anything extra to it apart from having a pumpkin ready - and possible new headbolts (as the old one usually should be thrown away when doing this).

I am talking about things like mounting stuff, driveshaft flanges, etc. Not too familiar with the Pcar diff other than driving them for hours and hours...

Thanks in advance.

 

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.

 

Yes please I was also wondering about this mod but could decide as mu knowledge is limited on this issue.

thanks

 

me too!

what fluids will you guys be using?

TIA.

 

I think that I have heard that if you mount an oem lsd you also need to change the two joint flange.

 

More info on the Carbonetics LSD please. Is it a clutch type LSD or more like the Quiaffe?

I'd also add the OS Giken, the ONE LAP GT2 of Peter Lier and Ian Stewart seems to get around well on it.

 

Correct, most will require a bolt-in style inner hub. Depending on the transmission in your car it could have clip in style axle hubs which aren't available with most aftermarket differentials. You'll also need a shim kit to properly do the install, other than the shimming it's a fairly straight forward process. We went with the Guard diff, and I couldn't be happier, the staff over at Guard talked me through most of the available options and helped educate me on what we needed. They also got the differential built and shipped to us in less than 24 hours, I'd defiantly recommend them to anyone.

 

Just looked into the OS Giken briefly and it sounds interesting. Apparently, they'll also have a rep at SEMA.

HV, do you have any more info on the OS Giken GT2 and it's suitability for street use?

Good luck MrWHite with your installation.

 

I don't but both Peter and Ian are memebrs here, can't remember their screen names though.

 

what is the OS Giken going for compared to the others? Quaife seems fairly economical and high quality. Guard seems good as well but slightly more expensive.

 

Just found some more info on it.See: http://www.osgiken.net/products/superlock.html
Apparently, it has a smoother action...due to twice as many plates(don't ask me )...which also enables complete locking..,less heat build up and translates to better performance out of slow corners and from a dig.

I don't think you can go wrong with either Guard or Quaife though.
The main benefit for me is that I can source the OSG locally without having to import it as I would with the other two.

I just need to find out if it is a mod that benefits our 4wd enought to justify the cost.

 

thanks.

 

It's not just about the brand, it's about the type of LSD. The quaiffe and OS giken are both gear type diffs which means that if both wheels loose traction (like if you go over a curb) there is no power applied to either wheel. The Guard Diff is a clutch type which can still supply power even if both wheels have lost traction. However with the clutches is less reliable.


I could be mistaken as it's been a long time since I looked into these but I'm pretty sure that is the case. Most of the time, on smooth tracks they'll be the same, but go to Sebring, or Road Atlanta where you're jumping curves and bumps and you'll feel the short comings of the Quaiffe and OS Giken pretty fast.

Someone correct me if I'm wrong.

 

HC, I thought that when it was called LSD, it automatically differentiated it from acting like an open diff. Both guard and quaife have LSD's and non LSD's. Very interesting.

here is an article I found:

http://www.planet-9.com/reviews/show...duct=306&cat=4

 

Ok, here goes my thoughts.

1. Quaife is good for AutoX/Street but track use if not its forte.

2. We ran the OSgiken in the One Lap GT2 and were very happy with it. The lockup under acceleration is very progressive and allows the car to rotate on exit, not push, and puts the power down well. Under braking from 150+ the car is rock steady and does not weave around under threshold braking like a worn out OEM LSD. In the One Lap @ Little Talledega Race Track morning session in the wet we were fastest beating all the GT-r's, Evo's, Subi, all wheel drive cars by being able to put the power down on exit. Install was seamless and done by an Independent Porsche shop.

3. We did a test for Grassroots Motorsports with my S2000 race car, OEM LSD (torque biasing) Kazz LSD, and OSgiken on the Ocala Kart Track. The OSgiken was fastest by a smidge. They other thing I found after we went to the OSgiken is our diff temps dropped. We used to come in from a race and the diff would be smoking hot and smelly. The OSgiken runs much cooler and we don't have to change fluids after every weekend.

4. I cannot compare it to the Guards as I have never driven a Guards equipped car.

5. A big plus of the OSgiken is cost. $1790.00

6. OSgiken is Clutch type LSD. http://www.osgiken.net/products/superlock.html

Peter