Fissionx

I feel the LSD makes a huge difference on street and track, especially once you stiffen the suspension one can get inside wheel spin and if the car has already taken a set on exit - the rear is loaded and you stop accelerating this makes matters much worse. I have several threads about this very topic and really don't understand why some sort of locking differential was not standard. I was getting inside wheel spin each lap on oak tree VIR; would never consider doing an autox in this 911...

The diff on my M3 was nothing to write home about but at least it was standard. The GT3 LSD seems more aggressive than the E46 m3 diff, I can feel it engaging more on track. I have yet to ride in a car equipped with the Guards unit... Looking in DE forum you will see posts of people claiming 2 second lap time improvements from just the LSD. You gain significant rear grip under turn-in and are not having to drive around wheel spin on exit. I was mainly interested in LSD because the car is much more controllable when the rear steps out.

Malakas

Thanks for all the replies.

I mean dont get me wrong... the (few) times I've tracked the car, it was marvelous. It just seems a little cheap of Porsche to use electronics when a good mechanical LSD would be preferable in the environment the car was designed for.

jlucas

Factory LSD is a pretty rare option for any 911 but it makes a huge difference. Drive one back to back with and without and you will want it.

FRUNKenstein

Hopefully it was worth the 4 1/2 year wait for Malakas to get his answer.

fpb111

One must have patience Grasshopper.

wwest

An LSD, Limited Slip Differential, is pretty useless unless you have one tire with more, enough, traction vs the opposite tire.

On the other hand a Torque Sensing, Torsen, differential would be highly desireable on the track.

For most of us the TC virtualization, simulation of an LSD will be more than satisfactory.

MiamiC70

40th AE's all have LSD

fpb111

Braggin' or complain'n?

hollmatt

Note the original Porsche diffs wear out if you track a lot, a Guard rebuild is a great way to replace it. Very happy with mine and it gave me 4 secs a lap quicker at the Glen..

MiamiC70

Braggin'

ditto

Yup. LSD, you want it. Keeps the TC light off and the power on. It works on the street. Streets have sand patches, puddles, bumps and sometimes even snow.

Vancouver996

I just put a limited slip diff in my 2004 c2 (PSM)
I bought a used lsd out of a crashed 2004 40th anniversary edition .

The porsche lsd , is a bit weak with its brass disks and weak ramps , it is known for wearing out quickly on the track and at about 40-50k miles in a street car .
But guard transmission makes a kit that essentialy takes the same internals they have in their own aftermarket diff and upgrades the porsche one , not only is it more robust and longer lasting , it performs better .

I had the GT rebuild done and installed in my tranny .
At the same time I installed a set of h&r street performance coilovers , h&r swaybars and upgraded every bush with powerflex purple street poly bushes .

What a great combination , it reminds me of a gt3 but without the bone jarring ride .
The lsd combined with the suspension really transforms the car .

Monster grip coming out of the corners , the power is just so tractable , and easy to get down .

If your car is mostly a commuter and hi way car , it's probably not something you need but if you track , auto cross , de or just love attacking the twistys , it's an amazing upgrade .

Quaiff and wave track make geared ts diff which are much cheaper and good offt he line but a plaited diff like a porsche or a guard one gives you deceleration lock up too , but cost a lot more .
Unless you luck out like I did and find a used one to rebuild .

I love it , a whole new world traction wise .

And it works just fine with the PSM , even with a 40 60 split .
The PSM just doesn't kick in as much .

IMO , the lsd is a better investment than aftermarket exhausts and intakes , if it's performance you're after . Power to the wheels!

Chiamac

I have one on my Jeep, 180k miles later and I have doubts if it's working anymore.

They seem to wear out and need rebuilding, and imo, psm would do a better job with brakes anyway than the clutch in a lsd could. That said with the normal engines there is so much weight back there and the tires are so wide that for normal use I'm not sure how much of a benifit lsd would give, and again it'd need to be rebuilt maybe as often as a clutch is replaced.

Gt3 or more horsepower and it's a different story.

Vancouver996

I've had my PSM car for over a year .
Putting the plate lsd in has made the car perform dramatically better in and out of the curves . Off the line acceleration is night and day better .

When you stomp on it off the line in the PSM car , when the driven wheel spins , the brakes kick in and bog the car down until traction is regained . With the lsd , power is transferred to both wheels , the car grips and shoots off the line , if one wheel breaks traction the other wheel takes the drive , if the PSM kicks in its only for a fraction of a second , you don't get the bogging down sensation .

You really need to drive both to understand it .

Vancouver996

Interesting write up on diffs from pelican


http://www.pelicanparts.com/techarti..._and_Seals.htm

Plate diff video


Torsion diff