Shows how strong the rods are.
Yes loading the engine at low rpms with boost or gas will cause massive detonation. The ECU can't pull the spark back enought to stop it. The intense heat has melted the exhaust valve stems, dropping them into the piston, followed by a compleat loss of money.
Sorry mate, I reckon you need a controler to bring on the gas, in tune with rpms, and some sodium filled valves.
Harvey.