The 2011 Buick Regal was offered with two four‑cylinder engines: a naturally aspirated 2.4-liter Ecotec and a turbocharged 2.0-liter. The base model uses the 2.4L, while the sportier Regal GS uses the 2.0L turbo.
Engine options
Here is a breakdown of the two engine choices available for the 2011 Regal in the United States.
- 2.4-liter Ecotec inline-4: approximately 182 horsepower and 172 lb-ft of torque.
- 2.0-liter turbocharged inline-4: roughly 256–270 horsepower and around 295 lb-ft of torque (the high‑performance Regal GS version is tuned to about 270 hp).
In short, the Regal’s power came from a pair of four‑cylinder engines: a naturally aspirated 2.4L for everyday duty and a turbocharged 2.0L for enhanced performance, with the GS badge signaling the peak output.
Performance by trim
Base Regal
The standard engine was the 2.4-liter Ecotec I-4, delivering about 182 hp and 172 lb-ft of torque, paired with a 6-speed automatic transmission in most configurations.
Regal GS
The high‑performance Regal GS used the 2.0-liter turbocharged I-4, tuned to around 270 hp and 295 lb-ft of torque, providing substantially more acceleration and sporty driving dynamics.
These engine choices gave the 2011 Regal a range from comfortable daily driving to a more spirited, performance-oriented ride depending on the trim.
Summary
For the 2011 Buick Regal, two four‑cylinder engines were available: a 2.4L naturally aspirated Ecotec producing about 182 hp, and a 2.0L turbocharged engine producing significantly more power (up to about 270 hp in the Regal GS). The base model used the 2.4L, while the GS used the turbocharged 2.0L for enhanced performance.