mbc vaccum lines

[DearDoger]

This should be a real simple question so hook up the mbc to the j-pipe and the wg acuator what do i do with the lines i take off those.

 

[1gDSM4g63]

Best way to install a MBC

You must be logged in to view this image or video.

 

[DearDoger]

yes i understand this but after i put the mbc on i will have two dead lines that used to go to the j-pipe and to the wg acuator. what do i do with this lines.

 

[kenamond]

Trace them back to their sources. They should both meet at a tee fitting. Then there'll be a line going from the tee back to the stock BCS where it connects to one of two nipples on the BCS. Then there'll be a final line going from the other BCS nipple to the intake pipe.

If you ever want to go back to stock, keep all of those lines and fittings. There's a restrictor inside of one of those lines that you need for bleeder-style boost controllers, so if you ever try replacing that line with a new piece of vaccuum line (without the restrictor), it won't work right.

The nipple on the intake pipe has to somehow be capped. You can do it a number of ways, but here's what I did:

Take the BCS-to-vaccuum line off the intake pipe. Call this vaccume line end "A" for later.
Take the other line on the BCS off along with the tee and other two lines and put them in a box somewhere you keep your stock parts (if you have such a box...if not, start one).
Take end A and plug it into the now-empty fitting on the BCS so that you form a "U". Each end of the BCS-to-intake pipe line will be connected to each nipple on the BCS. This will keep dirt out of the BCS. Atleast on 2gs, you need the BCS plugged in or the ECU throws a code. I think the 1gs don't do this, so the BCS can be removed and tossed in that same box if you want.

Put a nipple cap on the fitting on the intake pipe, or you have a pre-turbo leak that will be bad in the same way a boost leak is bad (the intake pipe is under vaccuum, so an open nipple will draw in unmetered air and you'll run a bit lean).