Intake Side
Air is drawn through the air filter then past the Mass Air Flow (MAF) and Intake Air Temperature (IAT) sensors. The
MAF sensor measures the mass of the air entering the engine and IAT obtains the temperature. Next, the air enters
the compressor side of the turbocharger through the lower intake manifold. The air is compressed above atmospheric pressure. The compressing process causes the air to heat up. Directing the air to an air to coolant Charge Air Cooler (CAC). From the CAC the air passes the CAC temperature sensor and through the intake throttle body and into the other side of the lower intake manifold. Inside the lower intake manifold the air mixes with EGR gases (if EGR valve is open), travels to the upper intake manifold, and through the right and left side rocker covers to the intake ports of the cylinder heads.
Exhaust Side
Exhaust gases exit the exhaust ports into the inboard exhaust manifolds. Exhaust gases are directed to the dual inlet
of the turbo via the right and left side up-pipe. The exhaust spins the turbine wheel inside the turbocharger. The turbine wheel spins the compressor wheel(s) via their common shaft. Some of the exhaust from the passenger side manifold is directed to the EGR valve through the EGR inlet pipe. When the EGR valve is being operated, exhaust flow goes through the valve then either through the EGR cooler or bypassing the cooler. This is done by the EGR cooler bypass valve. The exhaust gas enters the lower intake manifold and combines with the fresh air.
