The LF4's DOHC and twin turbo architecture has the makings to be an all out all-star performer on the street, the track, or the strip. Whether you're trying to up the boost on the factory turbochargers or you're looking for some larger turbos to really put the power down, you're in the right place!
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LF4 Engine info:
The LF4 is a six-cylinder, 3.6-liter twin-turbocharged engine produced by General Motors for use in high-performance vehicles. It is a more powerful version of GM’s 3.6-liter V6 LF3. Part of GM’s high-feature (HF) V6 engine family, alongside the LF3 and LFX, the LF4 made its debut in the 2016 Cadillac ATS-V Sedan and 2016 Cadillac ATS-V Coupe.
Rated at an estimated 455 horsepower (339 kW) and 445 pound-feet of torque (603 Nm), the LF4 has several unique features that expand its performance range and support track capability, including:
These features contribute to optimal boost production and more immediate power delivery. Approximately 90 percent of the LF4′s peak torque is available from 2,400 rpm to 6,000 rpm, meaning that the engine has broad torque curve that is conveyed in a feeling of responsive, sustained power at all rpm levels.
In addition, a high-performance lubrication system is designed to maintain optimal oil pressure and ventilation during high-lateral driving maneuvers typically encountered on a track. Even the turbochargers are designed for track performance, with the compressors matched for peak efficiency at the engine’s peak power levels, which means they demand less heat rejection (intercooling) for higher sustained power during track driving. The twin, low-inertia turbochargers’ featherweight titanium-aluminide turbines are used with vacuum-actuated wastegate control for precise, responsive torque production. In fact, the titanium-aluminide turbines reduce rotating inertial load by 51 percent, compared to conventional Inconel turbine wheels. That means less exhaust energy – which spins the turbines – is wasted in stored inertial loads. In practical terms, that means the relatively small size of the turbochargers and their lightweight turbines foster more immediate “spooling,” which virtually eliminates lag, for an immediate feeling of power delivery. They produce up to 18 pounds of boost (125 kPa). A single, centrally located throttle body atop the engine controls the air charge from both turbochargers after the temperature is reduced in the intercooler. This efficient design also contributes to more immediate torque response, while reducing complexity by eliminating the need for a pair of throttle bodies.
Unique vacuum-actuated wastegates – one per turbocharger – are used with the Twin Turbo for better management of the engine’s boost pressure and subsequent torque response for smoother, more consistent performance. They are independently controlled on each engine bank to balance the compressors’ output to achieve more precise boost pressure response. The wastegates also work in concert with vacuum-actuated recirculation valves to eliminate co-surge from the turbos – a condition that can result in dynamic flow reversal, such as the moment immediately after the throttle closes. This overall system integration contributes to the engine’s smoother, more consistent feeling of performance.