Why DOES MY TURBO CAR NEES AN OIL CATCH CAN?
Exhaust Gas Accumulates on Engine Around,Reduce Engine Power and Increased Fuel Consumption.
Blow-by is caused when a combustion in the engine forces fuel, air, and moisture past the piston rings and into the crankcase. From there, the blow-by is released by the crank case vents and back into the intake pipe. This occurs on all engines, but is worse on turbo engines due to the stronger combustion. This excess "gunk" will build up in the intake manifold, coat the intake valves, coldside of the turbo, intercooler, and intercooler chargepipes.
Since Direct Injection style fuel injection moves the injector directly into the combustion chamber, there's no spray of fuel on the intake valves to keep them clean, so crap accumulates on them.
As a result, the engine power is reduced, which is a big problem. The big problem is that making the valve dirty quickly affects the power and fuel consumption again.