turbos

THE OPERATION AND FUNCTION OF A TURBO

CHARGER INCLUDING OVERCOMING TURBO

LAG

AIMS

TO DESCRIBE THE

OPERATION AND FUNCTION
OF A TURBO CHARGER AND

HOW TO OVERCOME

TURBO LAG

OBJECTIVES

TO UNDERSTAND THE BASIC

OPERATION AND

FUNCTION OF A TURBO CHARGER

TO NAME 3 PARTS TO THE SYSTEM

AND TO LIST 3 CAUSES OF TURBO LAG

WHAT IS A TURBO

•A turbocharger, or turbo is a turbine
driven forced induction device which is driven by
the engines exhaust gases .

• It increases an engine's efficiency and power by
forcing extra air into the engines combustion
chamber and proportionately more fuel can be
drawn into the combustion chamber .

•The power output can be dependant on the size of
the turbo charger (larger = more power)

The alternative to a turbocharger is a
supercharger, and this is mechanically

driven by the engine.

Belts and gears are common methods of powering a
supercharger, but do place a mechanical load on the

engine to drive it

ALTERNATIVES

The turbochargers compressor draws in the air
and compresses it before it enters the intake
manifold at an increased pressure.

The power needed to spin the centrifugal
compressor comes from the engine's exhaust
gases.

THE TURBINE

THE COMPRESSOR

THE CENTRE HUB ROTATING ASSEMBLY

A TURBO CHARGER HAS PRIMARILY

THREE MAIN COMPONENTS

THE TURBINE

The turbine housings direct the gas flow

through

the turbine as it spins at up to 250,000 rpm.

THE COMPRESSOR / IMPELLER

The compressor increases the mass of intake

air entering the combustion chamber.

THE CENTRE HUB ROTATING ASSEMBLY

The centre hub rotating assembly houses the shaft

connecting the compressor impeller and turbine.

It also contains a bearing system to suspend

the shaft and is usually lubricated by a constant

supply of pressurized engine oil.

WHAT IS TURBO LAG

Turbocharger lag ("turbo lag") is the time required to
change power output in response to a throttle change.

You can notice it as a hesitation or slowed throttle
response when accelerating as compared to a naturally
aspirated engine where the response would be almost
instant .

This is due to the time needed for the exhaust system
and turbocharger to generate the required boost.

CAUSES OF TURBO LAG

Inertia, friction, and compressor load are
the primary contributors to turbocharger lag

SOLUTIONS TO TURBO LAG

Lowering the rotational inertia of the turbo’s
turbine will allow it to spool / rotate more quickly,
by using lighter parts that take less energy to turn.

Using reduced-friction foil bearings on the turbo/
impeller shaft will also help to reduce lag.

Reducing the surface area of the rotating blades,
and placing less restriction on the escaping exhaust
gases results in less impedance at low speeds.

Using two smaller turbo's as opposed to one large
one can help as they are smaller and have less
inertia and therefore can reach their optimum boost
delivery quickly

QUIZ

INTERNET RESEARCH

THE AIMS WERE

TO DESCRIBE THE

OPERATION AND FUNCTION
OF A TURBO CHARGER AND

HOW TO OVERCOME

TURBO LAG

THE OBJECTIVES WERE

TO UNDERSTAND THE BASIC

OPERATION AND

FUNCTION OF A TURBO CHARGER

TO NAME 3 PARTS TO THE SYSTEM

AND TO LIST 3 CAUSES OF TURBO LAG

Can you ?

THE END

ANY QUESTIONS