Honda 1. 5T L15B7 Si Turbo Engine Specs, Problems, Reliability . . . Honda 1 5T L15B7 Si Turbo Engine Specs, Problems, Reliability, Info The L15B7 is a 1 5-liter I-4 turbocharged gasoline direct-injection engine first introduced in the 2016 Honda Civic The engine is a result of Honda's downsizing strategy that involves using small displacement units in conjunction with a turbocharger to overcome the power problem