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2G T25 bolts

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MasterMatt209

Proven Member
473
30
Jan 17, 2015
Danville, Indiana
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So do I need to get an air fitting or cap this off? If so what thread is that? I have an aftermarket BOV if that changes whether it needs blocked or not. Just trying to finish the install today. Also if anyone has the bolts specs for the bolts that hold the water lines in place that would be helpful as well.
 
I believe its going to be a NPT-style thread (tapered). So, if you need to source boost from it then use a barbed nipple fitting with a NPT thread on the opposite side...or if you don't need it, then just use a NPT plug. It should either be 1/8" or 1/4" NPT. Or, just drill it and tap it for the smallest sized NPT plug you can fit in there.

IF YOU DECIDE TO DRILL/TAP IT: TAKE THE COMPRESSOR COVER OFF OF THE TURBO FIRST AND REMEMBER TO CLEAN IT OUT THOROUGHLY BEFORE INSTALLING/RUNNING.

Now, on to the water line bolts. Are you talking about the banjo bolts that attach the line to the turbo and block? Or, are you talking about the bolts that attach the lines to the block/whatever?
 
I believe its going to be a NPT-style thread (tapered). So, if you need to source boost from it then use a barbed nipple fitting with a NPT thread on the opposite side...or if you don't need it, then just use a NPT plug. It should either be 1/8" or 1/4" NPT. Or, just drill it and tap it for the smallest sized NPT plug you can fit in there.

IF YOU DECIDE TO DRILL/TAP IT: TAKE THE COMPRESSOR COVER OFF OF THE TURBO FIRST AND REMEMBER TO CLEAN IT OUT THOROUGHLY BEFORE INSTALLING/RUNNING.

Now, on to the water line bolts. Are you talking about the banjo bolts that attach the line to the turbo and block? Or, are you talking about the bolts that attach the lines to the block/whatever?

Thanks for the first but of info I’m going to block it off, as for the second question I meant the boot that mounts about halfway down the water line and holds in place but I figured out that it’s the same hold for the oil drain plug so I’m good on that. I just need to block off that bolt hole and I’ll be set
 
That hole in the compressor cover is the boost source for the Boost Control Solenoid (BCS) used to for controlling system pressures back to the wastegate. Before you cap it off make sure you have a hose somewhere that goes back to the wastegate actuator to control boost.
 
That hole in the compressor cover is the boost source for the Boost Control Solenoid (BCS) used to for controlling system pressures back to the wastegate. Before you cap it off make sure you have a hose somewhere that goes back to the wastegate actuator to control boost.

Well the car had a 16g and the only thing connected was to the wastegate to the solenoid with a t going somewhere else. I had questioned it before and someone said since it’s an aftermarket BOV it didn’t need it or something but I think I should be fine since the 16g didn’t have a port at all for that right?
 
Well the car had a 16g and the only thing connected was to the wastegate to the solenoid with a t going somewhere else. I had questioned it before and someone said since it’s an aftermarket BOV it didn’t need it or something but I think I should be fine since the 16g didn’t have a port at all for that right?
This is completely wrong. Bov has nothing to do with boost control. You need a boost source to go to the Wastegate and you need an intake manifold source to control the bov. You should know what the lines do and where they go.
 
It's a 3/16" hose nipple with 1/8" BSP thread on one side. An 1/8" pipe plug may work but it will only thread in about one or two threads max.

Boost source should always be as close to the compressor cover as possible to provide the quickest action, and the BOV/CBV should always be on it's own dedicated line from the intake manifold...never tee into the BOV/CBV line for a boost controller.
 
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