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I stopped in at Turbo Performance Center this afternoon, to get a quote for the installation of my Quaife diff. I was quoted $500 if it just drops in, and $1000 (yikes!) if the backlash and/or preload needs to be adjusted. The person I spoke with also said that I would need an alignment -- this sounded a little fishy to me, but when I questioned him about it, he insisted that the LSD will change the handling of the car to the point that a new alignment would be needed.
Have any Cayman owners with an LSD (of any type/brand) felt the need to get an alignment after their LSD was installed? Did it make the car "twitchier" or harder to drive in the rain? Those were the reasons given for needing the alignment.
Of course, after he casually threw out the $1000 price for the install, the stated reasons for adding the alignment kinda made me feel like I was just another sucker to be milked, but that's why I'm asking -- to get an idea if he was telling the truth or just trying to sell unneeded services to the target that just walked in the door. However, he did admit that they have yet to do an LSD install on a 987 (Boxster or Cayman), so he couldn't give me an exact figure or any feel as to how hard/time consuming it would be.
P.S. While I was there, I asked about their turbo kit for the CS. I was told that Mike (the owner) is down at VIR today and tomorrow testing out the kit. Mike actually drove the car down there, and is planning to drive it back (no trailering). They claim the kit makes 405 HP at the wheels (!) with only 6 psi of boost. Reportedly, Mike is lapping as fast as some of the full-blown race cars (forget which series) -- he also says the car seriously needs an LSD! The guy I spoke with at TPC recommended I call him back next week, because he believes they will be installing an LSD into Mike's car as soon as he gets back -- that way, they will have done one without experimenting on a customer's 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
TPC Racing
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It's not good being first in line. I was going to ask them about the doing the quaife install with the tt...maybe they can do a package price after they figure out everything.
I understand that PSM functions properly with the Quaife, right? If so...is there anything that might come into question when visiting the dealership for warranty issues? (IE Tranny issues...etc)
PSM - Porsche Stability Management
While it can’t overcome the laws of physics, the revolutionary Porsche Stability Management (PSM) system does lend an added degree of balance and control to the Cayman’s mid-engine driving dynamics, inspiring surefooted confidence in corners and extreme situations.
A standard feature on the Cayman and Cayman S, PSM continuously monitors steering input, road speed, yaw velocity and lateral acceleration to calculate the actual direction of travel. If the car begins to steer off line, PSM instantly intervenes with precision brake inputs on individual wheels to help bring the car back onto the driver’s intended path.
If braking alone isn’t enough to correct the vehicle’s cornering line, PSM then calls on the Cayman’s engine management system, adjusting engine output as needed to help stabilize handling. PSM can also compensate in an instant for mid-corner changes in load resulting from deceleration or braking. When Sport mode is selected with the optional Sport Chrono Package, PSM’s threshold for intervention is raised, allowing for greater driver involvement. If you prefer driving without automatic PSM assistance, the system can be set to standby at any time. In this case, it will only intervene under heavy braking, where both front wheels exceed the ABS threshold.
For all of its technical ability, PSM goes virtually unnoticed in everyday driving situations, preserving the Cayman’s natural agility.
I understand that PSM functions properly with the Quaife, right? If so...is there anything that might come into question when visiting the dealership for warranty issues? (IE Tranny issues...etc)
I suppose if your ring and pinion broke they might try to blame it on your Quaife unit, but otherwise I doubt they would even know it was in there unless you told them.
I agree with the K-Man, we don't change alignment specs for cars with or with-out LSD. Unless of course your shop feels you are now at a different level of driving performance and thinks an alignment change would help you.
Stan
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
As someone who has installed rear end gear sets using a dial indicator, remember you are talking about measurements of thousandths of an inch. These measurements can differ slightly from car to car, and from one set of gears to another (pcar gears are individually marked with optimum lash). If I were having LSD installed, would definitely have the preload checked / adjusted as necessary to prevent burning up the bearings.
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 agree that backlash and preload should be checked.
The manual actually warns that alignment might be modified by removing the diagonal supports underneath the car (necessary to install the LSD), but says the worst that may happen is that the rear toe is messed up, which will cause the car to not steer straight. Just see if it tracks straight when you're done. Mine had no problem.
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
