Chevrolet Performance LT4 E-ROD Directives D'emploi page 5

Running a Fuel Pump with the Fuel Pump Pressure Module (FPPM) control system
The fuel supply pump must be pulse width modulated (PWM), so that the supply fuel pressure can be controlled in the system. It is recommended that
the supply pump be tank mounted but can be installed outside of the fuel tank. If using a GM fuel pump, a pressure regulator is not needed. Late
model GM fuel pumps have a built-in fuel pressure relief valve. If using an aftermarket fuel pump, an adjustable bypass fuel regulator will be needed if
the fuel pump does not have an internal fuel pressure relief valve set at 84 psi. The adjustable bypass fuel pressure regulator needs to be mounted
between the supply fuel pump and the fuel pressure sensor that is mounted in the fuel line. The regulator must be set at 84 psi.
The fuel pressure sensor is supplied with the kit and needs to be mounted as far away from the engine as possible to dampen fuel pressure pulses that
the engine mounted high-pressure pump creates. The sensor needs to be mounted on the pressure side of the pump if using a non-tank mounted
pump. Mount the sensor and regulator near the fuel tank.
High Pressure (On Engine)
The high fuel pressure necessary for direct injection is supplied by the high-pressure fuel pump. The high-pressure fuel pump is mounted on the rear of
the engine under the intake manifold and is driven by a three-lobe cam on the camshaft. This high-pressure fuel pump also regulates the fuel pressure
using an actuator in the form of an internal solenoid-controlled valve that is controlled by the ECM.
Positive Crankcase Ventilation (PCV) System
A closed crankcase ventilation system is used in order to provide a more complete scavenging of the crankcase vapors. Fresh air from the air filtration
system (air cleaner) is supplied to the crankcase, mixed with blow-by gases, and then passed through a crankcase ventilation valve into the intake
manifold. There are two ports, one each per valve cover that need to be connected to the engine oil separator canister located on the right front of the
engine. Then the third tube needs to be routed to the air filtration system (air cleaner). This connection needs to be between the Mass Air Flow meter
(MAF) and the engine throttle body. The air for PCV needs to be measured by the MAF, in order for proper engine operation. See below image for
proper installation.
PVC HOSE ROUTING
Variable Camshaft Timing
This engine has the ability to vary the camshaft position versus the piston position. If you chose to use the Chevrolet Performance engine controller kit,
then it will vary camshaft timing to improve emission and fuel economy, while still producing great power. At idle, for example, the cam is at the full
advanced position, allowing exceptionally smooth idling. Under other conditions, the phaser adjusts to deliver optimal valve timing for performance,
drivability and fuel economy. At high rpm it may retard timing to maximize airflow through the engine and increase horsepower. At low rpm it can
advance timing to increase torque. Under a light load, it can retard timing at all engine speeds to improve fuel economy. A vane-type phaser is installed
on the front of the camshaft to change its angular orientation relative to the sprocket, thereby adjusting the timing of valve operation on the fly. It is a
dual-equal cam phasing system that adjusts camshaft timing at the same rate for both intake and exhaust valves. The system allows linear delivery of
torque, with near-peak levels over a broad rpm range, and high specific output (horsepower per liter of displacement) without sacrificing overall engine
response, or drivability. It also provides another effective tool for controlling exhaust emissions.
PART No. SHEET
LT4 E-ROD Instruction Sheet REV 04DE19
5 of 83
19370613