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You can calculate stuff to death, bottom line is what works on track.
when improving track performance, starting from stock; the usual goals are
1) less under steer
2) more overall traction(larger friction circle)
3) minimise unfavorable camber & toe change
4) balance in all aspects of performance
5) any change in one area shouldn't adversely affect other areas
The basic plan for a well thought out track oriented 911 is pretty well documented but does depend on the weight and power characteristics of the car.
Assuming a fairly stockish engined SC or Carrera, the recipe is fairly well known
22/28 torsion bars
adjustable sways
8 & 9 wheels there are increasingly good tire choices as you go form 15 > 16 > 17 > 18
225 > 245 front 245 > 275 rear
an effective asymmetric LSD
Bilsteins valved to the t-bars or Fox shocks
930 brakes, Carrera fronts w/ SC rears is a small improvement(but doesn't change bias not that you want to), taking out the p/v on a Carrera is a very bad idea(unless A/X is your thing)
Of course there are more or less aggressive variants at each step.
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