I have decided that before I can go on further I need to install a limited slip. If anyone has one available that they would be willing to sell, let me know. I emailed Guard Transmission, hopefully will hear from them soon. Preferably a clutch type, but a Torsen will be fine.

Thanks,

Wes

 

once we find some new spider gears for it, there will be a factory torsen available

 

whats wrong with it? I might could take it off your hands so you don't have to worry about it??? Price?

 

well, a car went in for its second pinion bearing job, and the spider gears didn't look good - so, he bought a guards unit in the interest of expedience - the plan was to rework the stock unit and sell it - i'm sure that if you offered him what he would net anyway, he'd do it

 

I understand that there are two kinds of LSD on 968s. Do both types spin both tires forward when rear is lifted off the ground?

Harvey

 

Are there transmission markings of the LSD units that distinguish them from non-LSD?

Harvey

 

Just option codes. The transmission itself is no different. Both the Torsen and Clutch type spin the tires forward. The Torsen was an $800 option, the clutch type, option 221 as I understand it was a $1700 option. The prices today brand new stand at $2347 for a Torsen, and $4100 and some change for a Clutch Type...if you can find one. My rep told me that Porsche Motorsport robbed up just about every clutch type left and made them motorsport 75% lock. This is all heresay, so I can't confirm anything.

Both will spin the tires in one direction, with the only difference being how they work. One uses clutches, the other uses gears. Torsens are the most common among factory cars because they promote better handling (turn in) and are cheaper to produce. The clutch-types are found on higher end LSD's, although BMW has always used them. Either works for me, clutch type is preferable, but at the cost of one, I will pass.

Wes

 

pretty sure the factory one works the same as my gt - based on that, a torsen type will not have the tires spinning in the same direction with the car in the air

 

Are you sure? A previous friends RX7 did, and it came with a factory Torsen LSD???

Wes

 

It depends on your use. If mainly street either will do fine. The clutch type should be better for the track. On braking a torsen will not lock up from what I am told. I would suggest a Guards unit.


Mike

 

I have one of the Porsche Motorsports units in my car...if I remember correctly it was about $1,500 from Porsche.

Jason

 

Jason,

Any chance you have a part number. I have one for a motorsport piece, but they wanted nearly $5000 for it.

Wes

 

Wes,

It's been installed for about 2 years now...I can't believe they have gone up that much!

I don't have a part number...is it easy to go under and find it?

Jason

 

Not the motorsport part. I had to call several of my motorsport dealers, and its like $3100 Euro plus shipping was the cheapest I found. After everything was said and done, my bill was like $4200. Then installation, etc... it would be a $5000 ordeal. The reason I was asking part numbers is there are several motorsport diffs, and they all kind of fit. The 964/993/930/968/944 all have different parts, but the first four are completely interchangable. So if the 964 piece is $1500, and the 968 piece is $4000, then I might have to do some experimenting. KAAZ also makes a clutch type LSD for the 964 G50 that utilizes 12 plates with a 60% lock. Its $1300 retail.

Wes

 

I've had two units from Guard Transmission (GT) in my S2. The first was a Torsen type and was from the initial production run for the 944. It worked really well on the street and I also drove it on the track a few times, where it also worked well.

For whatever reason... I decided to pull the Torsen type and install a GT clutch type, which was much beefier and had a stronger case compared to the Torsen type unit. It's also worked well on the street.

I find the clutch units a little easier to drive as they seem to be a bit more predictable in how they transfer the power, but I actually think the Torsen type gives better straight line traction, especially in the wet since it will transfer a greater percentage of power to the opposite wheel. With the clutch type, once one wheel starts to slip they usually both let go, which can result in a bit of fish-tailing. That generally doesn't happen with the Torsen type units since the Torsen type is constantly transferring the power back and forth between the two wheels and seems to provide better grip.

I would purchase a GT unit over any factory unit, Motorsports or not, which is much weaker since the cast case on the factory units are prone to break when driven hard... and when it goes it takes the whole transmission with it.