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The late model (1987+) Porsche 928s with the 32V engines used a hall sensor on the left hand camshaft to control the knock retard system which was factory installed with the EZK ignition system.  This sensor is known to fail, even on low mileage cars.  If the sensor fails and does not provide the proper signal back to the EZK module, the ignition will be retarded 9 degrees across the board above the load threshold.  This is a safety precaution to allow the engine to remain operational, albeit at a much lower power output.  If you have a turbocharged or supercharged 928, the operation of this sensor is absolutely critical to get the most performance out of the engine while remaining safe on your tune.

Don't overlook this critical piece of your 32V 928's ignition system!