P2A00 - A/F Sensor Circuit Range/Performance (bank 1 sensor 1)

Mitco39

The trick here is allowing the crankcase to vent to atm while at the same time keeping boost out of there. Ideally you want a bit of a vacuum at all times in the crankcase. But when you go boosted this stops happening under WOT as your manifold pressure is no longer below atm. This means that you cannot tap into the intake as you could under NA without some sort of metering system to keep the pressure of the crankcase at or below atm.

What you really need is a vac pump. because under WOT you don't have a vac source. At idle things are fine because of your throttle bodies. WOT in a NA car still has a marginal vacuum in the intake runners just due to the pressure differential between your air filters and the combustion chamber.

Its hard because for every idea that comes up there is a reason why its not going to work.

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