Chevrolet Performance LS9 Manual De Instrucciones página 3

Mass Air Flow (MAF) Sensor
NOTE: It is critical that the MAF sensor is mounted per the instructions below. Vehicle performance and/or driveability
may be affected if it is not mounted as recommended.
The mass air flow sensor must be installed in the induction system using the supplied MAF sensor mounting boss. The induction
system should be 4 inches in diameter and have a minimum straight section 6 inches in length. Mount the MAF sensor in the
middle of the straight induction section, ensuring that the middle of the mounting boss is at least 10 inches from the throttle body.
The MAF sensor must be oriented correctly in the induction system – note the arrow on the sensor indicating flow
direction. Be sure to weld the mounting boss correctly – the sensor will only mount one way in the boss (see diagram).
Weld the boss in place before installing the sensor. When installed in the vehicle, the MAF sensor should be mounted with the
connector end pointing between horizontal and fully upright – do not mount with the connector oriented downward.
MAF SENSOR MOUNTING GUIDELINES
MINIMUM 6" STRAIGHT SECTION
4"
TUBE
MAF SENSOR MOUNTING BOSS
MINIMUM 10" FROM THROTTLE BODY
Air Cleaner
It is recommended that a dry element air cleaner be used.
NOTE: Fueling cannot be guaranteed if an oiled element type air cleaner is used.
Oxygen Sensors
NOTE: It is critical that the Oxygen Sensors are mounted per the instructions below. The exhaust system MUST be properly
sealed – any leak near the sensors (upstream or downstream) can cause incorrect operation of the fuel control system. Vehicle
performance and/or driveability may be affected if sensors are not mounted as recommended or if an exhaust leak exists. Leak
check the exhaust system to ensure adequate sealing (even small leaks can affect fuel control).
Oxygen sensors should be mounted in the collector area of the exhaust pipe, in a location that allows exhaust from all cylinders
to be sampled equally. Be sure the connectors and wiring are routed away from high heat areas. The oxygen sensors should be
mounted with the sensor tip pointing between horizontal and fully downward – do not mount with the tip oriented upward. Weld
in the mounting bosses supplied (7/8" hole) if using headers.
NOTE: The harness has connections for two rear (post catalyst) oxygen sensors, they are not used in this application.
Exhaust Manifolds
It is recommended that you use the provided exhaust manifolds or similar LS Engine style Exhaust Manifolds.
Positive Crankcase Ventilation System (PCV)
How to set up your PVC system:
There are two ports on the engine and one on the oil reservoir that make up the PCV system. The ports on the engine are 1).
Left rear (driver side) valve cover. 2) Right Front (passenger side). The ports with silver tubes may look simple but, they should
not be modified. The tubes have a small orifice within them that is used in place of a PCV valve of earlier designs. These ports
must be connected to the oil reservoir. The oil reservoir must be connected to filtered clean air. The filtered clean air connection
must be within the engines air cleaner system and must be between the MAF (Mass Air Flow Sensor) and engine's throttle body.
The engine burns the air that enters the PCV system so, if the fresh air port is prior to the MAF then, this air will enter the engine
without being measured by the MAF and adverse engine operation may occur.
LS9 Crate Engine Control System
TITLE
ALL INFORMATION WITHIN ABOVE BORDER TO BE PRINTED EXACTLY AS SHOWN ON 8 1/2 x 11
WHITE 16 POUND BOND PAPER. PRINT ON BOTH SIDES, EXCLUDING TEMPLATES.
TO BE UNITIZED IN ACCORDANCE WITH GM SPECIFICATIONS.
AIRFLOW DIRECTION
TO AIR
FILTER
IR 27MY16
19299465
PART NO.
DATE
UP
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SHEET
REVISION
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