Publicidad
Idiomas disponibles
Idiomas disponibles
Package contents:
Item Description
Quantity
Engine Assembly
Engine Instructions
TECHNICAL INFORMATION AND OPERATIONAL REQUIREMENTS:
Turbocharger/Intercooler System:
A turbocharger is a compressor that is used to increase the power output of an engine by increasing the mass of the oxygen and
therefore the fuel entering the engine. A turbocharger is mounted either to the exhaust manifold or directly to the head. The turbine
is driven by the energy generated by the flow of the exhaust gases. The turbine is connected by a shaft to the compressor which
is mounted in the induction system of the engine. The centrifugal compressor blades compress the intake air above atmospheric
pressure, thereby increasing the density of the air entering the engine.
The turbocharger incorporates a wastegate that is controlled by a pressure differential that is determined by the engine control
module (ECM) by means of a PWM solenoid, in order to control boost pressure. A compressor recirculation valve, also controlled
by the ECM, prevents compressor surging and damage by opening during sudden throttle closures. When the recirculation valve
is opened it allows the air to recirculate back to the turbocharger compressor inlet. Engine control kit p/n 19328839 is available
through your GM dealer and contains a flashed ECM and engine harness to provide these functions if desired by the customer.
The turbocharger is connected to the engine oiling system by a supply and drain pipe. Oil is required for the bearing system
function and also serves to carry some heat from the turbocharger. There is a cooling system circuit in the turbocharger that further
reduces operating temperatures and passively dissipates bearing housing heat away from the turbocharger on shut down.
Intercooler System:
The turbocharger engine system should be supported by an air-to-air or air-to-water charge air cooler system. Fresh air should be
drawn through a heat exchanger to reduce the temperature of the hot compressed air exiting the turbo compressor, prior to delivery
to the engine combustion system. Inlet air temperature should be reduced to enhance performance because cooler air is denser in
oxygen and promotes optimal combustion. The charge air cooler should be connected to the turbocharger and to the throttle body
by ductwork and clamps that are at least 3 inches inner diameter and have appropriate clamps to provide clamping up to maximum
commanded boost pressure.
The intercooler system must include appropriately sized lines and heat exchanger and to ensure the inlet air temperature remains
in an acceptable range, especially during high boost operating ranges (eg: heavy accelerations, high throttle positions, etc).
For optimal performance, it is recommended that the inlet air temperature be kept below 140 C (284 degrees F) at the throttle body
inlet. It is critical that this temperature be kept below this temperature for safe engine operation. Use of production components is
recommended whenever possible however the plumbing, radiator & reservoir are up to the customer. If an aftermarket intercooler
is used it should flow a minimum of 250 grams/second of air flow.
Any type of air leak will have adverse performance effects. Cleanliness and proper positioning of all system clamps and joints is
critical and must be assembled with due care.
Dual Cam Phasing
The camshafts of the LTG turbocharged engine have camshaft position sensors and camshaft position actuators that the ECM
uses to accurately control the continuously variable intake and exhaust valve timing. This allows the combustion process to be
optimized by the ECM to increase the response of the turbocharger, providing a more immediate feeling of power to the driver.
Engine control kit p/n 19328839 is available through your Chevrolet Performance dealer and contains a flashed ECM and engine
harness to provide these functions if desired by the customer. If the cam phasers position are not ECM controlled they will default
to minimum overlap condition and will not allow full power to be obtained.
Gasoline Direct Injection
In the LTG turbocharged engine, the fuel is introduced directly into the combustion chamber during the intake stroke. As the piston
approaches top-dead center, the mixture is ignited by the spark plug, thereby giving the name spark ignition direct injection. Direct
injection allows the mixture to be leaner, with less fuel and more air at full power, and allows a slightly higher compression ratio,
resulting in improved fuel consumption at part and full throttle.
LTG Crate Engine
TITLE
GM Part Number
1
19328837
1
19328838
19328838
IR 24OC14
PART NO.
2
24
SHEET
OF
Publicidad
