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Has anyone done the LSD mod? If so what has been the result and what type did u use?
[PLEASE NOTE THIS TOPIC IS FOR THE DISCUSSION OF LSD's NOT for people to chime in on for a group buy, if you are looking for the LSD Group Buy topic and want to get in on the group buy then please look here: http://www.caymanclub.net/cayman-ven...al-anyone.html ]
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
(I have sent both a 3.2 Boxster S diff and a 3.4 Cayman S diff down to Quaife today to see if a) they already have a unit that will slot in or b) so they can measure up to make one. So hopefully by tomorrow I will know. And will keep the club informed on progress should anybody else want to go down that road.)
I'm Expecting a price <£1000 but will post update as soon as I know more information
I put the Farnbacher Loles torsen type LSD in the car back in late September. Honestly? In regular around town driving I don't notice much, if any difference. Perhaps on really cold mornings (the PS2 tires on the car seem really, really warm blooded) I'll find the car squealing the rear tires on a right or left turn leaving a stop sign or light, and feel a slight "catch" as the LS does its business. But I can't say I personally feel a huge change in ordinary day to day driving.
I have managed two HPDE days since the install ~ unfortunately, other than noting that my rear pocket feels a bit lite, I guess my blue denim rear end dyno isn't calibrated finely enough to give you an "absolute" "This is da Bomb" endorsement without having another car to do a side by side driving comparison. There were no other Caymans at the HPDE's I could do arrange to try to do a side-by-side with, and frankly the WMB M3's in the run group I was in, just didn't put up much of a fight :-)
To really expound on the differences, I think one would need to have two cars, one with, the other without the LSD available to swap into, back and forth to give the list any really relevant or accurate feed back. I think I do hear some occasional clunks etc. from the diff engaging or slipping on really tight, slow turns etc. It's been snowing here some the last couple of weeks, but I only have the OEM Michelin Pilot PS2's on the car. They're so pathetic in the cold on snow, that no amount of slip, limited or otherwise is going to provide any real feedback. I guess I should have tried getting more seat time in the car on the track before the limited slip went in.
I can say, that I have had the chance to do a "side-by-side" LSD comparison in another kind of car ~ two of the older Audi S4/6's I had a '93 S4 with a "locking" rear diff vs. a 95 Audi S6 Avant wagon with the latter model "electronic" differential control. We swapped the rear diff in the S6 wagon for a 1991 Audi V8 torsen mechanical rear diff and ran both cars at the Steamboat winter driving facility (read extreme slipping & sliding) in several Gruppe-Q events. The verdict there was the addition of the V8 torsen rear diff in the Avant wagon, had the Avant running circles around the 93 S4/6 sedan, even with the locking diff in the back. There's some video of the driving conditions etc. under which the testing was done available at www.gruppe-q.com
HTH mike
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
Farnbacher Loles
Farnbacher Loles launches Power Plus
Our exclusive new line of “Power Plus” kits will give you the extra performance you seek with the uncompromising quality and proven results that has made Farnbacher Loles the leader in Porsche performance.
Thank you for your input. I tracked the car once and with my "jam it out of the corners" style of driving the wheelspin was seriously limmiting my track time. I am sure the LSD will help me because of my style. I did not have this problem with my old '79' 930 turbo. You could jam the throttle hard leaving the turn and shoot out of there like a raped ape. I miss that feeling and that oil smelling thing. The CS is faster though in every other way.
Mike
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
When three Cayman’s and one 997 recently had a run over a relatively notorious road in the Peak District of England. (Cat and Fiddle) All 3 Cayman’s were “lighting” their PASM lights up like Christmas tree’s and obviously losing power, speed and drivability out of corners. The alternative was to switch PASM off, but this only led to spinning the inside rear wheel.
This is the first time in twelve months of ownership that I have really noticed that under these specific circumstances the car needs a diff (LSD), but under said circumstances boy does it need one….so it’s gonna have one !!!!!
I remember in the 80’s dropping one into a 944 and it totally transformed the car…(ok I started going through rear tyres like they didn’t cost real money, but it was awesome) . As most of the capable drivers I know say to me “sideways is NOT the Fast way !!”…but hell it’s the fun way and for sure I love the fun way.
PASM - Porsche Active Suspension Management
This active damping system offers continuous adjustment of individual damping forces based on current road conditions and driving style.
The driver can choose from two setup modes, ‘Normal’ and ‘Sport’, using a separate ‘damper’ button on the center console. ‘Normal’ mode is designed for general road driving and circuits with uneven tarmac. ‘Sport’ mode is intended for smoother track surfaces, where the harder settings help eliminate pitch and roll.
In either mode, PASM continuously evaluates the current conditions while automatically selecting the corresponding damper rates from the respective set of mapped values.
A range of sensors are used to monitor the movement of the body under acceleration, braking and cornering maneuvers, as well as on poor road surfaces. The PASM control unit then evaluates this data and modifies the damping force on each individual wheel in accordance with the selected mode. The result is a significant reduction in body movement as well as a better grip on the road.
For example: if ‘Sport’ mode is selected, the suspension is automatically set to a harder damper rating. If the quality of the track surface falls below a certain threshold, the system immediately changes to a softer rating within the ‘Sport’ setup range. When the quality of the tarmac improves once more, PASM automatically returns to the original, harder rating.
Need more information about PASM? Click this link: FAQ for PASM
LSD - Limited Slip Differential
A limited slip differential (LSD) is a modified or derived type of differential gear arrangement that allows for some difference in rotational velocity of the output shafts, but does not allow the difference in speed to increase beyond a preset amount. In an automobile, such limited slip differentials are sometimes used in place of a standard differential, where they convey certain dynamic advantages, at the expense of greater complexity.
The main advantage of a limited slip differential is found by considering the case of a standard (or "open") differential where one wheel has no contact with the ground at all. In such a case, the contacting wheel will remain stationary, and the non-contacting wheel will rotate freely– the torque transmitted will be equal at both wheels, but will not exceed the threshold of torque needed to move the vehicle, thus the vehicle will remain stationary. In everyday use on typical roads, such a situation is very unlikely, and so a normal differential suffices. For more demanding use however, such as driving off-road, or for high performance vehicles, such a state of affairs is undesirable, and the LSD can be employed to deal with it. By limiting the velocity difference between a pair of driven wheels, useful torque can be transmitted as long as there is some friction available on at least one of the wheels.
To see the installation of a LSD style unit Click Here -> Article Forthcoming Stay Tuned
I will be very interested to hear the response from Quaife. I mailed them last night to ask if they had any plans for a diff for the Cayman S. So far I have had no reply.
Looking at their on line shop they are asking £750 for their diffs to fit other Porsche models, which seemed pretty reasonable. Of course you have to pay someone to fit it.
If one is made available for the Cayman S, I will give it serious consideration. I will check with Porsche to see if there are any warranty issues. I can't imagine there would be, but it is best to check.
