Hey guys. I have looked all over at vacuum diagrams before and after emissions delete. I can't seem to figure out where the lines go and what needs to be capped after a BAC block off. Right now it looks like they are in the wrong spots. Mainly the one that goes in behind the alternator, the top of the transmission/back of UIM sort of above the clutch, and the one on top of the TB. Please help!

 

on the s4 BAC doesn't have any vacuum lines that are routed to it at all i think its just a coolant line that goes front the far back iron and the water pump housing i could be wrong. as for the TB vacuum lines that you have open, the front 3 would go to the rats nest. the rear ones i know the bigger one goes to the OMP vacuum lines.

 

As of right now, the one from the rear iron is connected behind the alternator ( possibly water pump?) and the rear nipple of the BAC is connected to the top of the TB. The "L" shaped nipple on the bottom of the BAC is plugged. The front nipple on the BAC has nothing. I am planning on pulling it off and just blocking it off. But it seems that this current set up is wrong.

 

Pics would be very useful....

 

So this line is attached...



Here on the rear iron.



This is uncapped.



This is plugged







View of the BAC.

 

The captions are on the top of each pic. Oops.

 

With the bac and the thermowax installed:


Rear iron ---> thermowax feed then out the top of the thermowax ---> to the bac -----> out the bac ---> to the back of the water pump.

If you plan on deleting the BAC run the coolant from the rear iron --> thermowax --> out the thermo wax --> to the back of the water pump.

^^^^^^This is exactly how I have mine run. If you are still confused I can pull my top mount and take some pictures for you.

~Kyle


Edit: the L shape on the bac just goes to the intake, if you are not going to be running the bac you just need to plug where the bac connects to the intake.