Thread: PCV system and going turbo

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  1. #1 PCV system and going turbo 
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    Hey guys what are you doing with the PCV system when you add a turbo? Cant find alot of info on eliminating it or re-working it. Thanks
    97 cavalier with L67 swap. F23 Getrag trans with stage 3+ SPEC clutch, KB pistons, L32 rods, LS6 valve springs, 3.4 pulley, ZZP downpipe 2.5, Full rotating assembly balance.
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  2. #2 PCV system and going turbo 
    Donating User Swiggles's Avatar
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    Run a breather, pvc hole in the throttle body gets tapped and plugged. And then run a catch can.

    Some run a hob, I think that's the word, switch to keep air moving at idle.
    No more GP 04 Impala SS Indy:
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  3. #3 Re: PCV system and going turbo 
    GXP Level Member GTPpower's Avatar
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    Some run a vacuum pump on a Hobbs switch to keep the crankcase under vacuum all the time.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  4. #4 Re: PCV system and going turbo 
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    Why couldn't you just put a one way check valve to the throttle body so when under vac it works normally then under boost it blocks flow into crankcase?
    97 cavalier with L67 swap. F23 Getrag trans with stage 3+ SPEC clutch, KB pistons, L32 rods, LS6 valve springs, 3.4 pulley, ZZP downpipe 2.5, Full rotating assembly balance.
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  5. #5 Re: PCV system and going turbo 
    GXP Level Member GTPpower's Avatar
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    You can do that as long as you are sure the check valve seals.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  6. #6 Re: PCV system and going turbo 
    GXP Level Member GTPpower's Avatar
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    But you still need to vent the crankcase under boost, or it will find its own vent.


    2001 GTP Drag Car - XPZ, Tischler heads, Upsidedown M90 IC'd, e85, Gen V, 2.3 w/ 5%OD
    2005 F350 6.0 - studded, deleted, tuned
    2001 GTP - cam, headers, nitrous, stock trans - 11.83 @ 116 <$2k in mods - sold
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  7. #7 Re: PCV system and going turbo 
    GXP Level Member Turbocharged400sbc's Avatar
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    Its not that its going to find a vent it's that you will dramatically increase oil blow by and likelihood of detonation from oil getting in the combustion
    ~James~ Psychotic Gearhead
    projects: 84 Cressida waGN~ 90 LN3 3800, equal length headers, T70, 89 700r4, misc parts,
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