The effects of turbocharger wastegate actuator upon engine performance and emission were experimented on a twin-cylinder spark-ignited engine fuelled by gas phase LPG. The load was given by setting the throttle wide open and the speed was varied from 1000 to 3400 rpm. Taking the base reference as naturally aspirated conditions, various performance and emission parameters were compared for the conventional wastegate system as well as electronic version focusing on manifold absolute pressure, knock and exhaust resistance. The manifold absolute pressure and wastegate position were calibrated for the electronic wastegate to optimally perform based on engine requirements. There was appreciable improvement in brake thermal efficiency as well as reduction of unburnt hydrocarbon emissions for the turbocharger with electronic wastegate. © 2021, Springer Nature Singapore Pte Ltd.