Check my OP on PTM demystified and read how different settings affect performance. Unless you engage PTM or turn everything off, or go to Comp Mode (NB completely diff stability system from PTM design principles) the car wont give you full torque values and ediff will be in a most stability as priority setting practically the same as PTM Wet setting.
PS i too think a c5z is an amazing car even now and given what the cost today plus track mods amazing choices for track cars on a cheap (relatively speaking).
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