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Sourcing for boost lines

 
Old 05-27-2019, 11:01 PM
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Default Sourcing for boost lines

So for the last few months, I had been going off old research and assuming all facets of the car that use the boost level (wastegate actuator, boost gauge, etc.) should be sourcing it from as close to the intake manifold as possible due to that being the actual PSI that the engine was seeing.

I just went to install a compressor inlet and outlet adaptor kit I picked up a while back onto the turbo I'll be using and realized there was a vacuum port on the compressor outlet adaptor. Do some people run their wastegate actuators or something else directly off the compressor outlet, or would it be wiser to run everything from the intake manifold and block that port?

I'm sure it's an obvious answer but I haven't personally built a custom turbo system before and like the reassurance of professional kitten tamers.
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Old 05-27-2019, 11:22 PM
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I have the compress outlet blocked for reasons you stated. Instead, wastegate signal should be sourced between the intercooler and throttle body.
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Old 05-28-2019, 12:23 AM
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Originally Posted by skylinecalvin View Post
I have the compress outlet blocked for reasons you stated. Instead, wastegate signal should be sourced between the intercooler and throttle body.
Appreciate it! This was the original plan but figured it was worth asking.

Leaves me to wonder what applications actually would use the port. I understand the flaw of using pre-intercooler pressures, but I guess there is some application for it if the port is included in a reputable kit...
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Old 05-28-2019, 01:24 AM
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Waste gate actuator pre-throttle. Compressor outlet port is OK, and, yes, that is why that port is there. If you experience boost droop, then make a port after Intercooler.

MAP sensor, FPR, blowoff valve control, and boost gauge are all post throttle (on intake manifold).
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Old 05-28-2019, 02:12 AM
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Originally Posted by DNMakinson View Post
Waste gate actuator pre-throttle. Compressor outlet port is OK, and, yes, that is why that port is there. If you experience boost droop, then make a port after Intercooler.

MAP sensor, FPR, blowoff valve control, and boost gauge are all post throttle (on intake manifold).
Finally found the right terms to search, so found more posts regarding this topic. I understand wastegate signal sourcing now but appreciate the pointer.
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