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Kit Content :
DESCRIPTION
LT4 ENGINE ( DRY OIL SUMP)
CAP-OIL FILL
INSTRUCTION SHEETS
PUMP-COOLANT
Cylinder Deactivation - Not Used With Chevrolet Performance Engine Control Kit
This engine is used in the Generation 7 Corvette. In production, to provide maximum fuel economy under light load driving
conditions, the engine control module (ECM) will command the cylinder deactivation system ON to deactivate engine cylinders
1, 7, 6, and 4, switching to a V4 mode. The engine will operate on 8 cylinders, or V8 mode, during engine starting, engine
idling, and medium to heavy throttle applications. This system requires many inputs (weight of vehicle, tire size, final drive
ratio, etc.) to work properly. These parameters are unknown when selling the Chevrolet Performance engine controller kit. Due
to these unknown parameters as well as the need to tune the motor mounts and exhaust system for operation in both V8 and
V4 modes. The Chevrolet Performance engine control kit disables this feature. The engine has not been changed, so cylinder
deactivation hardware is still present.
Ignition System
The Gen-V has an advanced 58X crankshaft position encoder to ensure that ignition timing is accurate throughout its
operating range. The 58X crankshaft ring and sensor provide more immediate, accurate information on the crankshaft's
position during rotation. This allows the ECM to adjust ignition timing with greater precision, which optimizes performance and
economy. Engine starting is also more consistent in all operating conditions. In conjunction with 58X crankshaft timing, the
Gen-V applies the latest digital cam-timing technology. The cam sensor is located in the front engine cover, and it reads a 4X
sensor target on the camshaft phaser rotor which is attached to the front end of the camshaft. The target ring has four equally
spaced segments that communicate the camshaft's position more quickly and accurately than previous systems with a single
segment. The dual 58X/4X measurement ensures extremely accurate timing for the life of the engine. Moreover, it provides an
effective backup system in the event one sensor fails.
Air Induction Humidity Sensor: This new feature ensures optimal combustion efficiency, regardless of the surrounding air's
humidity.
Coil-on-Plug Ignition: The Gen-V's individual coil-near-plug ignition features advanced coils that are compact and mounted
on the rocker covers, although they are positioned differently than on Gen-IV engine. An individual coil for each spark plug
delivers maximum voltage and consistent spark density, with no variation between cylinders.
Iridium-Tip Spark Plugs: The spark plugs have an iridium electrode tip and an iridium core in the conductor, offering higher
internal resistance while maintaining optimal spark density over its useful life. The electrode design improves combustion
efficiency.
Fuel System
Low Pressure (Fuel Tank To Engine)
The production system uses a returnless variable flow/pressure system that has been incorporated in the Chevrolet
Performance engine control kit. A returnless fuel system reduces the internal temperature of the fuel tank by controlling the
speed of the fuel pump and not returning hot fuel from the engine to the fuel tank. If using the Chevrolet Performance engine
control kit, a pulse width modulation capable fuel pump that delivers 500 kPa (72psi) at 45 gallons per hour is required. If not
using the Chevrolet Performance engine control system, then a fuel pump and a regulator that delivers 500kPa (72psi) with 45
gallons per hour of flow must be used.
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 supercharger 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.
LT4 Engine Installation
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