2 MBC's installs (pro's/con's)
Jul 18, 2007, 07:15 AM
#1
2 MBC's installs (pro's/con's)
I know there are 2 methods of installing a MBC:
1) a) cap turbo nipple b) cap air intake nipple c) cap WGS d) run vac line from WGA to side of MBC e) run vac line from bottom of mbc "pressure side" and "T" into BOV
2) a) cap air intake b) cap WGS c) run vac line from WGA to side of mbc d) run vac line from turbo nipple to bottom of mbc "pressure side"
Is there a benefit to using one method over the other. Boost response, accuracy, etc. Thanks in advance.
1) a) cap turbo nipple b) cap air intake nipple c) cap WGS d) run vac line from WGA to side of MBC e) run vac line from bottom of mbc "pressure side" and "T" into BOV
2) a) cap air intake b) cap WGS c) run vac line from WGA to side of mbc d) run vac line from turbo nipple to bottom of mbc "pressure side"
Is there a benefit to using one method over the other. Boost response, accuracy, etc. Thanks in advance.
Jul 18, 2007, 07:26 AM
#2
Running from the CBV vac line is using the actual manifold pressure signal.
Running from the turbo outlet nipple is using the turbo outlet pressure signal.
The pressure is always higher at the turbo outlet.
However, your boost gauge is tapped into the manifold (or should be), so either way you still set out to run the same amount of boost, just receiving the signal from two different sources. I've always ran mine from the CBV line as to use the actual manifold pressure as the source.
Running from the turbo outlet nipple is using the turbo outlet pressure signal.
The pressure is always higher at the turbo outlet.
However, your boost gauge is tapped into the manifold (or should be), so either way you still set out to run the same amount of boost, just receiving the signal from two different sources. I've always ran mine from the CBV line as to use the actual manifold pressure as the source.
Jul 18, 2007, 07:32 AM
#5
Running from the CBV vac line is using the actual manifold pressure signal.
Running from the turbo outlet nipple is using the turbo outlet pressure signal.
The pressure is always higher at the turbo outlet.
However, your boost gauge is tapped into the manifold (or should be), so either way you still set out to run the same amount of boost, just receiving the signal from two different sources. I've always ran mine from the CBV line as to use the actual manifold pressure as the source.
Running from the turbo outlet nipple is using the turbo outlet pressure signal.
The pressure is always higher at the turbo outlet.
However, your boost gauge is tapped into the manifold (or should be), so either way you still set out to run the same amount of boost, just receiving the signal from two different sources. I've always ran mine from the CBV line as to use the actual manifold pressure as the source.
Jul 18, 2007, 07:35 AM
#7
One runs from the turbo outlet nipple (nipple on the black outlet pipe that's bolted to the turbocharger that the LICP connects to) straight to the WGA.
The other would run from a "T" (spliced into the vacuum line that connects the CBV to the manifold) to the WGA. (You have to cap off the nipple on the previously mentioned turbo outlet pipe as this will not be used anymore)
The other would run from a "T" (spliced into the vacuum line that connects the CBV to the manifold) to the WGA. (You have to cap off the nipple on the previously mentioned turbo outlet pipe as this will not be used anymore)
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Jul 18, 2007, 07:54 AM
#9
1) a) cap turbo nipple b) cap air intake nipple c) cap WGS d) run vac line from WGA to side of MBC e) run vac line from bottom of mbc "pressure side" and "T" into BOV
2) a) cap air intake b) cap WGS c) run vac line from WGA to side of mbc d) run vac line from turbo nipple to bottom of mbc "pressure side"
Jul 18, 2007, 11:51 AM
#15
The pressure fluctuates more rapidly at the turbo outlet as opposed to in the manifold. The atricle had me thinking "what?" too. I was talking to a guy here and he said that diesels don't have throttle bodies like gasoline cars do,
which had me thinking.. Wouldn't no throttle body mean no vacuum? Aftrall, the closure of the throttle body is what helps create vacuum.
The article was basically stating that the pressure fluctuates more rapidly at the turbo nozzle as opposed to the manifold. (not at WOT, but on/off throttle situations) As in, after the airflow makes its way through all the bends, intercooler, etc... it kind of mellows out the waves.
I didn't quite understand this as there is always positive pressure in the piping between the turbo outlet to the throttle body, always.
which had me thinking.. Wouldn't no throttle body mean no vacuum? Aftrall, the closure of the throttle body is what helps create vacuum.
The article was basically stating that the pressure fluctuates more rapidly at the turbo nozzle as opposed to the manifold. (not at WOT, but on/off throttle situations) As in, after the airflow makes its way through all the bends, intercooler, etc... it kind of mellows out the waves.
I didn't quite understand this as there is always positive pressure in the piping between the turbo outlet to the throttle body, always.