Catch can for rear mount turbo setup
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Catch can for rear mount turbo setup Anyone know how to properly mount a catch can on this setup? Any of you rear mount turbo guys wanna share how exactly you routed your catch can? Car has the LS6 intake and valley cover and has a one-way check valve from the throttle body to the passenger side valve cover. Ready to place an order for a catch can just wanna make sure how exactly it'll have to be setup before doing so.
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Joined: Jul 2013
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From: Portland, Oregon
I think you will need to run a vented catch can instead of one pulling vacuum from in front of the throttle body. Outside of that, it is the same way you set it up without a rear mount turbo.
You can take a line from each valve cover, and "T" them together into one inlet of the catch can, and run another line from the LS6 valley cover to the other inlet, of a dual inlet vented catch can. You could also use three single inlet vented catch cans, one on each valve cover and one connected to the LS6 valley cover. You could run one big single inlet vented catch can and just "T" all three hoses together before the inlet on the catch can.
The main thing to take away from this is that the easiest and best way to use a catch can with a rear mount turbo is to use a vented catch can that doesn't need a vacuum reference in front of the turbo/blower.
Or you can use check valve filtered vents on either valve cover and/or the LS6 valley cover. There are plenty of options, but a dual inlet/no outlet/vented can would be your best bet, in my opinion.
You can take a line from each valve cover, and "T" them together into one inlet of the catch can, and run another line from the LS6 valley cover to the other inlet, of a dual inlet vented catch can. You could also use three single inlet vented catch cans, one on each valve cover and one connected to the LS6 valley cover. You could run one big single inlet vented catch can and just "T" all three hoses together before the inlet on the catch can.
The main thing to take away from this is that the easiest and best way to use a catch can with a rear mount turbo is to use a vented catch can that doesn't need a vacuum reference in front of the turbo/blower.
Or you can use check valve filtered vents on either valve cover and/or the LS6 valley cover. There are plenty of options, but a dual inlet/no outlet/vented can would be your best bet, in my opinion.
Thread Starter
Teching In
Joined: Sep 2016
Posts: 9
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I think you will need to run a vented catch can instead of one pulling vacuum from in front of the throttle body. Outside of that, it is the same way you set it up without a rear mount turbo.
You can take a line from each valve cover, and "T" them together into one inlet of the catch can, and run another line from the LS6 valley cover to the other inlet, of a dual inlet vented catch can. You could also use three single inlet vented catch cans, one on each valve cover and one connected to the LS6 valley cover. You could run one big single inlet vented catch can and just "T" all three hoses together before the inlet on the catch can.
The main thing to take away from this is that the easiest and best way to use a catch can with a rear mount turbo is to use a vented catch can that doesn't need a vacuum reference in front of the turbo/blower.
Or you can use check valve filtered vents on either valve cover and/or the LS6 valley cover. There are plenty of options, but a dual inlet/no outlet/vented can would be your best bet, in my opinion.
You can take a line from each valve cover, and "T" them together into one inlet of the catch can, and run another line from the LS6 valley cover to the other inlet, of a dual inlet vented catch can. You could also use three single inlet vented catch cans, one on each valve cover and one connected to the LS6 valley cover. You could run one big single inlet vented catch can and just "T" all three hoses together before the inlet on the catch can.
The main thing to take away from this is that the easiest and best way to use a catch can with a rear mount turbo is to use a vented catch can that doesn't need a vacuum reference in front of the turbo/blower.
Or you can use check valve filtered vents on either valve cover and/or the LS6 valley cover. There are plenty of options, but a dual inlet/no outlet/vented can would be your best bet, in my opinion.
if you are speed density tuned setting up with a proper system to handle high hp and boost while keeping pcv function is possible.. with the right equipment 
maf tuned and main engine filter at the back you are already heavily compromised on setup, so may as well do the RACE style can and upgrade later as the opportunity presents
maf tuned and main engine filter at the back you are already heavily compromised on setup, so may as well do the RACE style can and upgrade later as the opportunity presents
Thread Starter
Teching In
Joined: Sep 2016
Posts: 9
Likes: 0
if you are speed density tuned setting up with a proper system to handle high hp and boost while keeping pcv function is possible.. with the right equipment
maf tuned and main engine filter at the back you are already heavily compromised on setup, so may as well do the RACE style can and upgrade later as the opportunity presents
maf tuned and main engine filter at the back you are already heavily compromised on setup, so may as well do the RACE style can and upgrade later as the opportunity presents
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TECH Addict
Joined: Jul 2013
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From: Portland, Oregon
You can use a vented single inlet can and "T" both valve covers and the LS6 valley cover all into the single inlet. Or you can use a vented dual inlet can and "T" the valve covers into one inlet and the LS6 valley cover into the other inlet.
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Verdad Gallardo any fitting with built -in pcv like most valley plates and newer driver valve covers are practically useless for controlling crankcase pressure. take off the oil cap and try blowing through them
no i am not suggesting drilling all this out, it has a purpose so understand that first.
also merging two 3/8" hoses into one 3/8" hose only flows as much as one 3/8" hose. don't fool yourself. this includes if a catch can's exit fitting is smaller than the inlet fitting(s) the smallest hose regulates the entire system.
here is a beautiful fleabay example:
see how the inlet fittings neck down? see how small the neck of the breather is? useless.
no i am not suggesting drilling all this out, it has a purpose so understand that first.
also merging two 3/8" hoses into one 3/8" hose only flows as much as one 3/8" hose. don't fool yourself. this includes if a catch can's exit fitting is smaller than the inlet fitting(s) the smallest hose regulates the entire system.
here is a beautiful fleabay example:
see how the inlet fittings neck down? see how small the neck of the breather is? useless.