BOV ?'s
BOV ?'s OK, I'm slowly putting together my first turbo build, how important or necessary is a blow off valve? I really don't like the ricer woosh sound, but if I need one, I will work one in.
TECH Junkie
Joined: Jul 2015
Posts: 3,012
Likes: 48
GN'S and others didn't have them, and did fine. But it's debatable as to if not having one is hard on the compressor. Personally, I'd do it, as it isn't exactly big money.
On The Tree
Joined: Dec 2013
Posts: 182
Likes: 11
From: North Vanacouver , BC
I just finished a build on gen4 Alu 5.3/4l80e with s475 and I don't plan on running one . Driving around town I barely ever hear compressor surge if the boost stay below 4-5 lbs . I plan to daily drive it, will see how the turbo holds up. You can also recirculate it to avoid the noise also they sell quite ones as well that don't sound ricey.
TECH Regular
Joined: Jul 2019
Posts: 460
Likes: 44
This is prob your best bet. You can get a BOV that has a tube output. Route that back into your intake tube pre boost pipes.
point of BOV is to release positive pressure from tubes so the pressure doesn’t smack your TB and break it, as well as having all that pressure go back towards your turbo. Kinda no point in NOT running one.
point of BOV is to release positive pressure from tubes so the pressure doesn’t smack your TB and break it, as well as having all that pressure go back towards your turbo. Kinda no point in NOT running one.
Yep you want one.
Put it as close to the compressor as possible.
Never after an intercooler.
A good re-circulation will re-capture some of the kinetic energy of compressor input and is highly recommended, it may improve response (higher initial shaft rpm)
Put it as close to the compressor as possible.
Never after an intercooler.
A good re-circulation will re-capture some of the kinetic energy of compressor input and is highly recommended, it may improve response (higher initial shaft rpm)
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Yes take some time to look at factory turbocharged vehicles. Like nissan sr20det, toyota 2jz-gte and mitsubishi 4g63 style engines.
Near all factory turbo cars use recirculation to appease the maf sensor and it just happens to also help with the shaft speed if done right.
The bypass simply routes back into the turbo inlet, right after the air filter before the compressor wheel.
Near all factory turbo cars use recirculation to appease the maf sensor and it just happens to also help with the shaft speed if done right.
The bypass simply routes back into the turbo inlet, right after the air filter before the compressor wheel.
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You can always 'do without one' the negative consequences are not tangible immediately
I have an auto and anti-surge housing and still heard a significant amount of surge just driving around below 3psi.
I would never run a turbo I cared about without a bypass and high quality paper air filter.
I have an auto and anti-surge housing and still heard a significant amount of surge just driving around below 3psi.
I would never run a turbo I cared about without a bypass and high quality paper air filter.