i just read that the 993tt had an LSD in the rear STANDARD..

why doesnt the 996tt have an LSD, and why was it never an option ?

 

I don't remember but was it not an option for the later '05 models or for the Turbo S ? The 997TT has the LSD as an option again from the start.

Anyway...The Turbo doesn't need that much LSD due to it's huge grip in rear and also FWD helping the acceleration in corners.

But for example I still bought a 45% LSD from Manthey-Racing, will test it in the spring time when the tracks open up here.

It should be a good mod for active track use...(but not an essential mod, it goes fine without it too.)

 

The Gaurds LSD makes a world of difference even on the street with
aggressive sport driving. Before the installation the PSM would kick in
3-4 times on each outing on the street. Now, even with wet roads
it very seldom adjusts the R to F percentages. IMHO one of the
best mods for a 550+hp 996TT. And it lays the foundation for any
future increases in performance or track time. Also when the PSM
engages it uses the ABS system and applies braking on the wheel that
has lost traction. This can not be allowing maximum performance.

 

What LSD di you get? 60/40. I'm reasonably confused about the % lock-up on acceleration and braking in regards to picking the best set up for 80% street use. Any suggestions?

 

The Gaurds LSD has 4 settings, I did use the 60/40 setting.
I was told that unless I was tracking most of the time and running
13" slicks 60/40 was best. I am very satisfied.

 

How much is a lsd???

 

$2750

 

I paid $2500 for my Gaurd LSD.

 

I thought all 996 AWD Porsche's had a viscous center LSD. I'm not very familiar with the tranny/diff setup, but since the tranny is basically sitting at the rear axle, does it have both a center and rear diff?

 

I dont see a need to have AWD and LSD.

 

After going to a pms 40/60 lsd the only difference I noticed was going around corners, you can hear the inside tire making more noise.

 

One more thing to break...there is SO much grip stock that I too wonder if it is needed on these cars. Now, if tracking 2700 is cheap. But for street reality...I just cannot see needing it. My world only of course.

 

If you have the $$ and the HP the LSD is fantastic.
I really don't care if you see the need, you don't know what
your missing if you don't have one. To each his own, just
trying to help the members with a decision.

 

Chill out man, I have a personal opinion from many track days, and I'm entitled to that. That's all I'm saying. I dont see the need, unless you have unhookable HP, I have mid-high 500's and dont see a need for LSD and AWD.

 

An LSD also performs some % of lockup under deceleration, which helps keep the rear more stable under heavy braking. That's why you see them rated with a different percentage of lockup for accel vs decel (60%/40% for example).

A quote from Steve Weiner over on Rennlist that sums it up very well:


Some good info on the Guard website:

http://www.guardtransmission.com/lsd_info.htm

http://www.guardtransmission.com/velocity.htm