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Old 06-24-2022, 07:38 PM   #1
subaru_gc8
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Default Recirculating blow off valve

So I have been planning a build and I have an air to water intercooler set up, so my question is does it matter where the recirculating bypass valve is placed?
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Old 06-24-2022, 10:13 PM   #2
motorbykemike
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somewhere between the turbo and the throttle body

in theory after the intercooler and its inherent pressure drop is better

in the real world , wherever it fits is fine

splitting hairs here
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Old 06-24-2022, 10:19 PM   #3
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you really don't need one at all though
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Old 06-26-2022, 12:26 AM   #4
subaru_gc8
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Why do you say you don't need one?
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Old 06-26-2022, 12:57 PM   #5
motorbykemike
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everything has it's positives and negatives

yes they can help with compressor surge when chopping the throttle

i've never bought into the hype that the bypassed air going back into the turbo inlet helps with spooling back up , especially with a free flowing air filter setup

they are almost always open at idle or vacuum , hurting spool up actually

google it up for a bit

what turbo are you using ?
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Old 06-27-2022, 12:39 AM   #6
subaru_gc8
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Quote:
Originally Posted by motorbykemike View Post
everything has it's positives and negatives

yes they can help with compressor surge when chopping the throttle

i've never bought into the hype that the bypassed air going back into the turbo inlet helps with spooling back up , especially with a free flowing air filter setup

they are almost always open at idle or vacuum , hurting spool up actually

google it up for a bit

what turbo are you using ?
G30 660
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Old 07-11-2022, 11:54 AM   #7
HughGordon
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Idle and cruise don't generate enough vacuum to open a bypass valve. It's just the same as a blow off valve but with a hose to recirculate the air.
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