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Vortech EVO Supercharger plumbing Q&A?

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If anyone can correct me please do, slight confusion!

1. I was wondering why EVO SC kits plumb the BOV from the high side after the intecooler back to the high side before the intercooler?

2. They also run a bypass line going from after the MAF back to the intake side of the SC.

My understanding is that the BOV should be routed back to the intake side (low pressure) of the SC and not sure why they run the other line (Vaccum maybe)?. Please correct me on the plumbing.


Edited by Mother
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Thanks - 1999Porsche911, having trouble posting a reply to the 6spd forum. So is the crankcase vent is tee-d going to the MAF to the inlet? And the DIV is vented to the inlet also like in picture? Any pics helpful!


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I apologize for my mislabeling of the MAF/Throttlebody and taking the time on the drawing, so there are (2) connections made to the inlet side of the SC (1) from the Crank vent and (2) from the bybass valve as in the picture. Also couple other Q's

1. Oil for the SC is picked up from leftside eng or the rightside at the oil pressure switch. Note pictures.

2. Fuel injectors size eludes me, some say they are they 38# some say #42 could you clarify.


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The pickup for the oil on the 3.4 is exactly where you show on the left side of the engine. Size of the injectors I do not know, but if you bought the system from Todd at EVOMS.COM, he could tell you. I assume you bought the system directly and are installing it yourself?

Edited by 1999Porsche911
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No, my system is being built from scratch (for the 3.4) with some improvements like different diverter valve then Bosch, fans (on timer)on the front aftercooler radiator (gets HOT!! here in phoenix), S Vs SC trim charger still thinking on that one etc. Evidently the gear ratio on the SC trim vortech spins up alittle faster then the S trims do, some have suffered lagging at 5000-5500 RPM's todd says that it's the vario cam but still not convinced more research is needed. Have you noticed the lag in yours? Again thanks for your feedback.

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