ok i just got the car back together and have one stray vac line. its the boost line. where does it plug into? i thought it was the BOV but am not sure any help is appreciated

 

is it the vacuum line that goes to the pressure sensor???? (boost sensor)

 

no, i got it hooked up, but where does the pressure sensor line go?

 

both the BOV and the boost sensor need to be connected into the upper intake manifold. there are 2 places. one is on the ACV and one is right below the BAC vavle. you can either plug one into each nipple or cap one and "T" both BOV and boost sensor off one nipple

 

And tee in a Aftermarket boost gauge while you're at it.

 

sweet thanks guys, does it matter which goes where? i just got my series five turbo on and i'm only boosting 5 psi max. whats the deal?

 

without a boost controller both the S4 and S5 turbos should only boost 5psi

 

actually its around 6 psi and i thought it would be higher cuz my exhaust. rp dp, bonez race pipe apex'i catback

 

should be higher if you have a full downpipe and everything for sure...I peak at 13psi with a 3" RB turbo back and no boost controller

 

Go4Long - did you upgrade any parts of your fuel system to accomodate that much extra boost? if not are you worried about possible dammage to the engine. When i put on my exhaust i was hitting 12 psi in 3rd and thought it was too much for the stock fuel system and cut it back to about 9psi. am i just being a little girl and it is safe to do that much or should injectors or fuel pump be swapped at that point?

 

^ you should at the very least have a walbro pump. How did you cut down your boost? If you opened up your exhaust or intake the only way to keep boost down is to control your throttle, restict the intake and/or exhaust or port the wg.

 

on s5s like s4's the wastegate is controlled by about a 5.5 psi spring. however, on the s5 there is a boost controller of sorts in the form of a preasure solenoid under the intercooler that will raise the boost to about 8 psi stock. only problem is with 3"tid and full rb exhaust it would creep to about 12psi in 5th gear so i ran the vac line directly from the compressor to the wastegate and bypassed the stock boost controller making the wastegate open at about 5.5psi and even with the creep in 5th i am only hitting 9 and still running nice and rich which should be fine untill i get my g-force ecu chip and larger injectors

 

then with a boost controller set to 9psi i shouldn't have any creep at all. once i get some money

 

I didn't upgrade anything, just an HKS PFC Fcon...but I gotta take a look at the injectors and pump when I get a chance. it is running stupid rich though, I shoot some pretty decent flames when I accelerate away in third gear.