The BMW B38 is a DOHC 1.5 litre 3 cylinder petrol engine with a mono - scroll turbocharger and an 11:1 compression ratio .
The BMW B38 is a DOHC 1.5 litre 3 cylinder turbocharged petrol engine . 
 The B38 features a single - scroll turbocharger manufactured by Bosch - Mahle Systems and an 11:1 compression ratio .