Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Engine Performance: System: Turbocharger: Operation
The turbine impeller of the turbocharger is driven by the exhaust gases expelled from the cylinder combustion chambers. At idle speeds the engine operates like a normally aspirated engine.
As engine speed increases with opening of the throttle valve, the amount of exhaust gas increases. This leads to an increase in the rotational speed of the turbine. Turbine speed may increase up to 130,000 RPM.
The turbocharger is equipped with a wastegate to prevent engine damage from excessive boost pressure. Below 6.4 psi (.45 kg/cm2 ) the wastegate valve is closed so all exhaust gas is directed through the turbine. At the specified pressure, the wastegate diverts exhaust gases around the turbine. The wastegate valve controller diaphragm is operated by an air pressure signal from the intake manifold. The air relief valve is designed to relieve air pressure at 7.5 psi (.53 kg/cm2 ).
The turbocharger is lubricated by engine oil. Full floating type bearings are used to form desirable lubrication films on bearing surfaces during operation. Lubricating oil is also essential in cooling the turbocharger to prevent bearing failure.
The turbocharger is water cooled. Coolant flows through a drain hose from cylinder head through a pipe to turbocharger bearing housing. After bearing housing is cooled, coolant flows into thermostat housing in intake manifold.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.