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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
__________________ CaymanS Track Videos 2004 996GT3 / 2007 CaymanS / 2008 SLK350 / 2007 Cayman S Track Car (Modified with parts from: 997GT3, 996GT3, 997GT3RS, Porsche Motorsport, Tarrett, Mantis, Arlan, AP Racing, Moton, Eibach, Tubi, Aasco, Sharkwerks, Quaife, TC Design, Heigo, Fikse, Softronic, TeamTech, Traqmate, SVtek, ChaseCam, Pagid, Rennline, Hooiser, Motul) Complete Mod List and Setup Info
Quaife TBD works great for twisty roads and tight stuff on track, installed without issue and maintenance-free, and great price through Cayman Club. I don't know anything about the other one you mention. I haven't seen any negative comments posted by anyone who's gotten a Quaife installed.
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
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 believe the FVD LSD unit is the one that Paul Guard of Guard tranmission was warning some folks about that it was a cheap knock-off and not well made and would not stand up over time. I have not personally seen or used the unit, just relaying what Paul (Geary) was saying. If that's the case then I would certainly vote for the Quaife TBD unit instead. I have about 5,000 miles on my Quaife unit, no problems, plenty of track use. See Tess Tickle's topic thread for the Quaife pricing, etc.
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
The differential pictured is a TBD, not an LSD. I can see one of the helix planetary gears through the hole, and the attempt at describing the lock-up as 20%-80% (variable) is another clue.
I know that Chinese knock-offs of Quaife units have been circulating in the Japanese import market for a few years, but I don't know if the FVD would be one of these. The only way to know for certain would be to obtain one and open it up.
The Chinese Cayman LSD is apparently not quite ready yet ... but I have one of the 930 versions of these that would be identical in internal construction. Scary quality .... not worthy of any Porsche car.
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 believe the FVD LSD unit is the one that Paul Guard of Guard tranmission was warning some folks about that it was a cheap knock-off and not well made and would not stand up over time. I have not personally seen or used the unit, just relaying what Paul (Geary) was saying. If that's the case then I would certainly vote for the Quaife TBD unit instead. I have about 5,000 miles on my Quaife unit, no problems, plenty of track use. See Tess Tickle's topic thread for the Quaife pricing, etc.
Thanks K-Man, but I am fairly sure that FVD is not a low quality knockoff.
FVD-Brombacher is based in Germany and appears to be a long time Porsche tuner and parts supplier, with some sophisticated engineering abilities.
I am hoping that someone had used the FVD product or could explain the differences.
__________________ CaymanS Track Videos 2004 996GT3 / 2007 CaymanS / 2008 SLK350 / 2007 Cayman S Track Car (Modified with parts from: 997GT3, 996GT3, 997GT3RS, Porsche Motorsport, Tarrett, Mantis, Arlan, AP Racing, Moton, Eibach, Tubi, Aasco, Sharkwerks, Quaife, TC Design, Heigo, Fikse, Softronic, TeamTech, Traqmate, SVtek, ChaseCam, Pagid, Rennline, Hooiser, Motul) Complete Mod List and Setup Info
While true that FVD is based in Germany, the FVD-USA group has not been without its issues in the past so I would not automatically assume that their differential is without issues. As Geary pointed out the one shown is not an LSD but rather a TBD. Since I have no first hand experience with the FVD unit I really can't help you any further. I would say that your Porsche tech is, however, in error and probably relying on old information and does not really know anything about the unit FVD is selling for the Cayman. Is there some other reason you were looking at the FVD besides your tech's recommendation?
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
