Vacuum/boost line routing
Vacuum/boost line routing When plumbing the vacuum/boost system, I have read that it is best to not share lines. But both my boost gauge and electronic boost controller are in the cab. Can I run a single line into the cab for both the boost controller and boost gauge? I plan on putting my BOV on it's own line. And then the wastegate needs a pressure only line, probably from the compressor housing or somewhere in the charge piping close to the TB for more accuracy.
Thoughts? Thanks!
Thoughts? Thanks!
Teching In
Joined: Feb 2011
Posts: 43
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Yes - boost gauge and controller can share the same line. Connect directly to manifold.
BOV - dedicated source. Connect just after TB
Wastegate source - connect to compressor cover or somewhere pre-TB and ideally pre IC.
BOV - dedicated source. Connect just after TB
Wastegate source - connect to compressor cover or somewhere pre-TB and ideally pre IC.
Why wastegate to pre-IC? Shouldn't it be as close to the manifold as possible so it's seeing the same pressure that the engine is seeing? I will be using an electronic boost controller too.
Teching In
Joined: Feb 2011
Posts: 43
Likes: 0
The boost at the turbos is almost always different than the boost at the intake manifold. At the end of the day, what really matters is what the motor is actually receiving (at the manifold).
Remember that a wastegate is simply a back-pressure regulator.
The boost control it provides is a byproduct of regulation of the exhaust gas flow which then also controls the shaft speed of the turbo.
Because of this. there is a delay in the amount of boost climb and drop when the source for the gates is farther away from the turbo.
Later, I will post up a perfect dyno plot that shows what is happening at the turbo versus what is happening at the motor (the dyno MAP sensor was connected at the turbo instead of at the manifold).
