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Originally Posted by tmc
Rail26,
. . . In my opinion, a real track car should have LSD, and I was surprised (and it gave me great pause) to discover the 987 does not even offer it . . . I hope Porsche considers adding LSD as an option . . .
tmc
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I share the same sentiment. However, I don't expect to see a factory LSD available for the boxster/cayman any time soon. Thanks to the weight distribution of the mid-engine layout, slipping the inside rear tire does not occur nearly often enough to warrant an LSD. . . at least that's what porsche seems to think. Whereas, the front-engine Z4M has much less mass holding the rear tires to the ground, and a good deal more power.
If you are willing to spend, quaiffe and guards both have LSD options available for boxsters. Quaiffe specializes in 'torsen' type LSD's that transfer power according to torque , and Guards specializes in 'clutch' type LSD's that transfer power according to relative wheel speed.
The following quote is from a thread on renntech.org by the owner of a boxster with the 'torquey-er' 3.4L 996 engine. . .
Limited Slip Differential, Performance Improvement
"Last Sunday we drove the car for the first time with the LSD and what a ride!
It was the last PCA-LPR autoX of the season with 47 drivers with around 35 cars. The results have not been posted yet but we may have run 2nd and 3rd over all with a ultra light full race 914 in first place. I can tell you there were some 911's working very hard to beat the Monster Boxster. But the real credit goes to the Quaife torque biasing differential, we accelerated faster and corner much faster.
You can view Quaife's web site:
http://www.quaifeamerica.com/
Three parts were purchased from Patrick Motorsports in Phoenix: 1. Quaife Torque Biasing Differential, 2. Side Cover, 3. Bearing. Total with shipping $1,827.51.
This is the best single mod that I have done in terms of performance improvement."