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There is no need to dyno the facts. The facts are in the simple mechanics of how a motor works.
I'll explain this again.
When a motor is at idle, the pcv valve is used to allow the crankcase to pull in small amounts or air into it. This method is used at idle because there is no vaccum on the system.
When you hit the gas the car goes into vacuum in order to run, I won't get detailed about that. Now the vacuum pulls the pcv valve closed and now must find it from another source. This is where the large tube by the turbo comes in.
In the stock "T" design it was used by the inlet of the turbo compressor, in the plastic intake tube. to pull vacuum from the case and the hv at the "T". This is stock setup.
The S14 uses a different system that eliminates the "T" and has better baffling in the VC.
Now, the engine mechanics part again.... If the motor can not pull vacuum under throttle, the pressure will rise in the crank case from the force of the motor pounding away at the air under the rotating assembly. To much pressure and pop go yout rings, and other things.
In order have proper flow in your crankcase you need to have it in vacuum to decrease resistance in the crank case and keep pressure down.
Now lets think. TO much pressure under the pistons will will increase the stress on the rotating assembly and can cause ring failure because the pressure.
Now, doesn't it seem like a good idea to pull that pressure out with vacuum?
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