Forced Induction & Drivetrain
Turbocharger operation, boost pressure, intercoolers, wastegates, turbo failure causes, automatic transmission fluid, CVT transmissions, torque converters, and TCC lockup.
- Explain how a turbocharger increases engine power using exhaust gas energy
- Describe the role of intercoolers, wastegates, and boost pressure
- Identify the most common cause of turbo failure
- Compare automatic transmissions, CVTs, and their fluid requirements
- Explain torque converter operation and TCC lockup
Lesson 1
Turbocharger Operation & Boost Pressure
How a Turbocharger Works
The turbocharger increases intake air pressure for more power using exhaust gas energy. It consists of two main sections connected by a shared shaft:
- Turbine side (exhaust) - exhaust gas spins a turbine wheel at up to 150,000+ RPM
- Compressor side (intake) - the compressor wheel (connected to the turbine shaft) compresses incoming air
What Is Boost Pressure?
Boost pressure is intake manifold pressure above atmospheric from forced induction. Atmospheric pressure at sea level is approximately 14.7 psi. When a turbocharger compresses the intake air, manifold pressure rises above atmospheric - this additional pressure is called boost.
For example, if the turbo produces 10 psi of boost, the total intake manifold pressure is 24.7 psi (14.7 atmospheric + 10 boost). This denser air charge allows the ECM to inject proportionally more fuel, producing significantly more power from the same engine displacement.
A turbocharger uses exhaust gas energy to compress intake air for more power. Boost pressure is intake manifold pressure above atmospheric created by forced induction.