Twin turbo sequential full#

The diagram above shows the involved valves and pressure lines (yellow) at full load. If the solenoid valve closes, the boost pressure is directed to the associated setting box, which opens the actual valve via a push rod. If the solenoid valves are deactivated, the air pressure is vented to the outside via a filter on the valve. The system pressure is first directed through pressure lines to the electric solenoid valves (VSV = Vacuum Switching Valve). The function of the valves (exhaust gas control and intake air control valve) is controlled by the associated solenoid valves. The turbos are now running in parallel.Įxtended information on the above picture: 1 and 2 compress the intake air together. This starts the second turbo to turn.ĭuring the start-up phase of Turbo # 2, the built-up pressure is first fed via a reed valve to the intake system (blue below the intake air control valve).Īt higher speed, the exhaust control valve and intake air control valve are both open, whereby turbo no. Prespooling is initiated by opening the exhaust bypass valve.

This is to prevent the turbo being brought 'cold' to full power against the system pressure, which is detrimental to the bearings. Prespooling refers to the 'running ahead' of the 2nd turbos. The sequential charging is controlled via control boxes and solenoid valves:Īt low speed, the exhaust control valve and intake air control valve are closed, driving only Turbo # 1: The two turbos only run in parallel when they have built up the same boost pressure. If the speed increases, the second one starts up. The Supra engine is charged via two CT12 turbochargers.

Twin turbo sequential