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YOUR RESEARCHlimited slip question
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Use braking therefore reducing power
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Suggestion
The main disadvantage is that while an LSD allows full power application while slipping, PSM uses braking therefore reducing power.
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Suggestion
Also I think the ratio was different for the stand-alone LSD since you need to use a milder LSD to function correctly with TC.
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can anyone explain to me the difference between these options?
Are they available individually?
#220 Limited Slip,
#222 Traction Control,
#224 Auto Limited Slip Differential
220 is the LSD in the transaxle.
222 is traction control software (you can turn it off with a button in the dash). Do not confuse with PSM, which is more advanced.
224 Don't know.
M224is active brake differential(ABD) for Tiptronic, it is a low speed only mechanism that applies one of the rear brakes via the abs pump when differential wheel speeds are detected above a threshold value.
My 99 6-speed had all three options. A very nice package. Really miss that car.
I think the LSD and TC were available separately but I think the Auto LSD only works with TC. I've never read a description of it but I believe it is control software designed to cut out the TC at a lower speed than on a non-LSD-equipped car. TC equipped cars use a different ABS module than non-TC cars (4 channel instead of 3 channel). Also I think the ratio was different for the stand-alone LSD since you need to use a milder LSD to function correctly with TC. I'm also almost positive that the LSD was not an option for the tiptronic cars.
PSM is like souped up TC but does not include, nor work with, LSD until something like 2003 or 2004. The LSD/TC combo was a 1999, manual, C2 option only. Actually it was available on 1998 C2s as well for those in ROW or Factory-converted US cars.
TC and LSD are both designed to reduce wheel spin/slippage at the rear wheels, TC at low speed by applying braking and the LSD at higher speeds by increasing the percentage of power to the non-slipping wheel. I think the Auto-LSD was used to turn off the TC function at the correct speed for the LSD to take over whereas a non-LSD car would utilize the TC to a slightly higher speed.
PSM is basically an all electronic four wheel version of TC. The main advantage is that it works at all speeds and at all four wheels. The main disadvantage is that while an LSD allows full power application while slipping, PSM uses braking therefore reducing power.
I have the PSM version on mine Carrera. I'm so glad Porsche didn't screw up and call it "PMS". That would probably cause the car to nag and complain.... and say "Sorry, I have a headache!!!"
