The LF4.R is a six-cylinder, 3.6-liter twin-turbocharged racing engine used to power the Cadillac ATS-V.R race car.
The LF4.R is the racing version of the production-spec 3.6-liter twin-turbo V6 LF4 used in the 2016 Cadillac ATS-V.
The engine was developed and built by GM Powertrain. It uses production aluminum block and heads, and can make up to 600 horsepower.
Specific technical upgrades for the LF4.R over the production-spec LF4 include:
- Larger, twin BorgWarner turbochargers
- Increased capacity intercoolers
- Competition engine management
- A direct, side-exiting exhaust
The lightweight aluminum block and heads are counterbalanced by a rear transaxle unique to the race car, which gives the ATS-V.R a weight distribution of 49 percent front, 51 percent rear.
| Engine: | LF4.R 3.6L, Twin-Turbo V6 with production aluminum block and heads |
| Power (hp / Kw): | Up to 600 / 447 @ 7400 RPM |
| Torque (lb.ft. / Nm): | 520 / 704 (unrestricted) |
| Fuel supply (L / Gal): | 120 / 31.7 fuel cell |
| Engine management: | Programmable Bosch MS5.1 |
| Turbocharging: | BorgWarner EFR Series twin-turbochargers, boost set to FIA specifications |
| Intake: | Carbon fiber with integral high-capacity water-to-air-intercoolers |
| Exhaust: | Side exit direct exhaust from turbos, no mufflers |
