pressure values for each RPM are selected to make sure that the engine gets the requested torque. When one or both of the following criteria are met, a limitation of the charging pressure is set. In first, second and reverse gear there is an RPM dependable maximum value. The ECU calculates which gear that is in use by comparing the speed of the automobile and the engines RPM. When pre ignition/pinging occurs a maximum charge pressure is set on the basis of a mean value from each cylinders retarding of the ignition. One or both of the following criteria initiates a lowering of the charging boost pressure to basic boost pressure. When the brake pedal is pressed down and pin 15 on the ECU is supplied with battery voltage. Certain fault codes is set (Faulty throttle position sensor (TPS), pressure sensor, pre ignition/pinging signal or charging pressure regulation) or low battery voltage. Computing, adaptation When the required charge pressure has finally been calculated it is converted to the PWM signal that controls the solenoid valve, The ECU then controls that the actual pressure (measured by the pressure sensor) corresponds with the required pressure. If needed the PWM is fine tuned by multiplication of a correction factor. The correction factor (adaptation) is then stored in the memory of the ECU and is always used in the calculation of the PWM signal. The rationale with this is to make sure that the actual pressure as soon as possible will be equal to the required after a change of the load has occurred. Ignition timing Ignition cassette The red ignition cassette used with Trionic 5 is mounted on the valve cover on top of the spark plugs. The ignition cassette houses four ignition coils/transformers whose secondary coil is direct connected to the spark plugs. The cassette is electrically supplied with battery voltage from the main relay (B+) and is grounded in an earth point. When the main relay is activated the battery voltage is reformed to 400 V DC which is stored in a capacitor. 400 V voltage is connected to one of the poles of the primary coil in the four spark coils. To the ignition cassette there are four triggering lines connected from the Trionic ECU, pin 9 (cyl. 1), pin 10 (cyl. 2), pin 11 (cyl. 3) and pin 12 (cyl. 4). When the ECU is grounding pin 9, the