Am i right?
Even if the car did over fuel the lambda sensor will anaylise the exhaust gas, and the fueling will be corrected instantly.
A rich mixture is extreamly unlikly to pre -ignite.
Running the car with no resirculation or atmophseric valve will couse the system to be over pressurised, ie the components have a tollarance level in relation to presure.
I dont think there will be enough manifold pressure to spin the turbo back and forth in an instant if run without any type of valve, as it will be spinning at thousands of rpm.
squirell555 nothing personal, but the truth is out there.