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After replacing the stock T25 turbo on my NG900 with a TD04 from a 9-3 Viggen/9-5 Aero, the turbo intakepipe didn't fit anymore. The intakeside on T5 turbo's differs from T7 turbo's. An Aero spec T7 intakepipe was fitted, but it seemed to be restrictive at higher powerlevels. Most tuners replace it with a bigger one. These pipes are quite expensive, so I decided to build my own pipe connecting airbox and turbo.
The crankcase ventilation line was not connected to the new intake, but a small filter is fitted, as you can see on the picture.
This setup works fine, but Julian mentioned the following issue: The bigger of the hoses exiting the cam cover (the one that has the filter on) is used to evacuate crankcase gases during high load/full throttle. The vacuum in the intake where this hose would normally terminate is supposed to greatly assist the evacuation of the gases (basically sucking them from the cam cover). Since the engine lost this suction and is tuned for more boost, I am wondering if crankcase pressure could get excessive and if it might cause a problem in the long term.
The crankcase ventilation line was not connected to the new intake, but a small filter is fitted, as you can see on the picture.

This setup works fine, but Julian mentioned the following issue: The bigger of the hoses exiting the cam cover (the one that has the filter on) is used to evacuate crankcase gases during high load/full throttle. The vacuum in the intake where this hose would normally terminate is supposed to greatly assist the evacuation of the gases (basically sucking them from the cam cover). Since the engine lost this suction and is tuned for more boost, I am wondering if crankcase pressure could get excessive and if it might cause a problem in the long term.