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Home >> Porsche >> 2011 >> 911 Speedster >> Repair and Diagnosis >> Drivelines & Axles >> Wheel Hubs >> 40 - Front Wheel Suspension, Drive Shafts -- CARRERA (997) >> WM 4000IN Tests/Notes For All-Wheel Drive (CARR. 4 Coupe, Turbo Coupe, CARR. 4S Coupe, TARGA 4, TARGA 4S, CARR. 4 CABRIO, CARR. 4S CABRIO, Turbo CABRIO) >> Information For Four-Wheel Drive Vehicles >> Controlled Four-Wheel Drive (PTM) On The 911 Turbo

Controlled Four-Wheel Drive (PTM) On The 911 Turbo

The PTM control unit (PTM = Porsche Traction Management) is specifically designed to suit the approved tire dimensions. The use of unapproved tires can result in different wheel speeds and can affect vehicle handling or cause PTM to switch off.

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