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I've read a lot of material and still can't get down to where all the PCV and vacuum lines belong. Help is greatly appreciated. I'm seeing a lot of setups.
diagram of ports and vacs
my build
EDIT.........#1 was removed, there's no #1. Thanks kingal0n
I do not have a #1 on my 5.3 truck engine, not sure what you have there. A hole? I have number 3, that is where the PCV valve is.
Number 7 cannot run to number 6 because 6 will blow boost pressure into 7, blowing oil all over the place. On my engine, Number 7 will eventually go to the compressor inlet, so that during WOT 7 will get some suction (PCV action) which I will mediate by adjusting the air filter flow to get some pressure drop. For now, #7 just hangs open, so I can see if any oil comes spraying out, ever. Basically I hope to have 10-15psi of boost and #7 stays dry, no need for a 'catch can'. Thats a sign of a healthy engine.
if #2 is the huge port then yes brake booster, just make sure it also has the check valve somewhere.
A port on the intake manifold, like #4, goes to #3. The #4 will try to blow boost into the crankcase, but the pcv valve in #3 will stop that from happening. Make sure you test the pcv valve, use a high quality one that you have tested.
The air that #4 sucks out of #3 gets replaced through #7, which is why it needs to be connected to a fresh air source, like the compressor inlet (post air filter, pre turbo). Or simply left open (but then you have unfiltered air going into the crankcase which is also terrible)
Fuel regulator needs intake manifold vacuum, and to see boost. So it could go to any port on the intake pretty much, like #4. I wouldn't T-off into much if anything though, when it comes to things like regulator, boost controller, sensitive electronics or diaphragm devices like bypass valves.
#5 looks like a PRE-throttle body port. Meaning it will never see much intake manifold vacuum, only positive pressure (boost pressure). This can be used to drive open a wastegate.
I think #6 is just a different size version of #4, meaning it could run the regulator or bypass valve etc...
I do not have a #1 on my 5.3 truck engine, not sure what you have there. A hole? I have number 3, that is where the PCV valve is.
Number 7 cannot run to number 6 because 6 will blow boost pressure into 7, blowing oil all over the place. On my engine, Number 7 will eventually go to the compressor inlet, so that during WOT 7 will get some suction (PCV action) which I will mediate by adjusting the air filter flow to get some pressure drop. For now, #7 just hangs open, so I can see if any oil comes spraying out, ever. Basically I hope to have 10-15psi of boost and #7 stays dry, no need for a 'catch can'. Thats a sign of a healthy engine.
if #2 is the huge port then yes brake booster, just make sure it also has the check valve somewhere.
A port on the intake manifold, like #4, goes to #3. The #4 will try to blow boost into the crankcase, but the pcv valve in #3 will stop that from happening. Make sure you test the pcv valve, use a high quality one that you have tested.
The air that #4 sucks out of #3 gets replaced through #7, which is why it needs to be connected to a fresh air source, like the compressor inlet (post air filter, pre turbo). Or simply left open (but then you have unfiltered air going into the crankcase which is also terrible)
Fuel regulator needs intake manifold vacuum, and to see boost. So it could go to any port on the intake pretty much, like #4. I wouldn't T-off into much if anything though, when it comes to things like regulator, boost controller, sensitive electronics or diaphragm devices like bypass valves.
#5 looks like a PRE-throttle body port. Meaning it will never see much intake manifold vacuum, only positive pressure (boost pressure). This can be used to drive open a wastegate.
I think #6 is just a different size version of #4, meaning it could run the regulator or bypass valve etc...
You're correct there's no #1, that's where the oil filler tube is.
#7.....I've seen people leave it open, cap it off, or breather filter on it.
#2 to #12....yes the booster has a check valve.
#4....is 4 going to #3 or for a vacuum block?
#5....for wastegates
#6....vacuum block....regulator, boost controller, TH350 modulator line.... Use #4 for PCV #3
07-29-2017, 09:53 PM
Vac/PCV port route for twin turbo. Pics provided 
