What is the most powerful 1.5 liter car engine currently in production?

It's difficult to definitively say which 1.5-liter engine is the "most powerful" without knowing the specific criteria you're using. Power output isn't the only factor to consider - things like torque, efficiency, and specific applications also play a role.

However, here are some of the most powerful 1.5-liter car engines currently in production, along with their key specs:

Honda's 1.5-liter turbocharged engine (found in the Civic Type R and others):

* Power: 306 horsepower (228 kW)

* Torque: 300 lb-ft (407 Nm)

Mercedes-AMG's 1.5-liter turbocharged engine (found in the A45 S and GLA45 S):

* Power: 416 horsepower (310 kW)

* Torque: 369 lb-ft (500 Nm)

BMW's 1.5-liter turbocharged engine (found in the M135i xDrive and 2 Series Coupe):

* Power: 302 horsepower (225 kW)

* Torque: 332 lb-ft (450 Nm)

Ford's 1.5-liter EcoBoost engine (found in various Ford models):

* Power: Up to 200 horsepower (149 kW)

* Torque: Up to 200 lb-ft (270 Nm)

Factors to consider:

* Power: The highest horsepower output is usually considered the most powerful.

* Torque: Higher torque provides better acceleration and pulling power at lower RPMs.

* Specific application: A high-powered engine might be suited for sports cars, while a more efficient engine might be better for fuel economy-focused vehicles.

Ultimately, the most powerful 1.5-liter engine for you depends on what you're looking for in a car.