Venturi vacuum pump

[sleepydsm]

Iceminion, can you explain to me how this setup actually works? You're taking two pressurized sources (when at WOT), the crankcase and the intake manifold (a1 on TB), and then hooking them to a vaccum source. Why can't you just run the vent line right to the vaccum source (like stock)? I don't see how the two pressure sources merging together make evacuation any better.