Definitions for "Wastegate"
A turbocharger relief valve to prevent the buildup of too much pressure.
"wastegate is a valve that diverts exhaust gases away from the turbine wheel in a turbocharger. Diversion of exhaust gases causes the turbine to lose speed, which in turn reduces the rotating speed of the compressor which reduces boost pressure in your engine. The primary function of the wastegate is to stabilize boost pressure in turbocharger systems. The wastegate is controlled pneumatically by a wastegate actuator.
a device that bypasses some exhaust flow around the turbine section of a turbocharger to control maximum boost