I think the main acceleration advantage of the PDK is the launch (0-30kph). It's actually slower than the Manual from 100kph to 200kph, despite having to shift twice and having more torque from the engine (ECU sets peak torque 11NM higher, since no limitation from the gearbox).
The only explanation is that the PDK weighs more and wastes more power as heat in the wet clutches, so less power gets to the wheels. I thought the extra torque liberated by the ECU would offset this in a straight line, but only for the first few meters from launch.
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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi