HKS SSQV BOV Review

Stinger · Jun 21, 2022

I was worried a BOV would put me in the Paul Walker Fast n Furious category. It’s not loud around town when driving normal. At lower levels of boost it’s barely noticeable in the cabin. I installed the purple sound tuning insert to give it a lower sound. It has a nice low hiss. Install was straight forward on the fenfab pipe, but the c clip was a PITA. You’ll need c clip pliers. I got a set on Amazon in a nice soft case for a reasonable price. Make sure it’s seated properly and the clip is all the way expanded or you’ll pop the BOV right off. Don’t ask me how I know. Might want an extra gasket too. Overall, I’m happy with it and glad I went with an aftermarket BOV.

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Rocketw19 · Jun 21, 2022

Rookie question sorry. I am a super charger guy I know nothing about turbos. I am curious why you would change the BOV? is it just for noise? or are you making a lot more boost so needed?

MattJ716 · Jun 21, 2022

Rocketw19 said:

upgrading the factory one in theory would help hold boost better at high PSI compared to the cheap factory one. Going to a dual port or VTA for sound is mainly .. just for sound.

TMac · Jun 21, 2022

Rocketw19 said:

The original purpose of the BOV was to eliminate boost spikes during shifts or rapid throttle transition. If you were rushing along at full boost (say 15psi), and closed the throttle, the pressure from the compressor would build up substantially with nowhere to go. This could lead to a "stall" condition which could damage the turbo's compressor wheel. So, the BOV opens at (say 17psi) venting the additional pressure back into the intake before the compressor.

Back in the 80s and 90s, as people started modifying turbo cars by upping the boost, the factory plastic BOVs would fail or leak leading to vendors introducing better versions including those that would "vent to atmosphere" making noise while doing it. Like many hot-rodding ideas, the sound of the blow-off venting implied high performance- sort of like a loud exhaust.

In the real world of turbo cars built in this century with variable valve timing and electronic throttles, depending on how the tuning is done you don't need a blow-off valve at all. Later STs do not have a blow-off valve. So yeah, it's just for noise.

Stinger · Jun 21, 2022

Rocketw19 said:

Reliability. Running higher than stock boost. Did I need one? No. Did I want one. Yes. The noise is not intrusive at all especially on the highway and around town in low boost.

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Stinger · Jun 21, 2022

TMac said:

The original purpose of the BOV was to eliminate boost spikes during shifts or rapid throttle transition. If you were rushing along at full boost (say 15psi), and closed the throttle, the pressure from the compressor would build up substantially with nowhere to go. This could lead to a "stall" condition which could damage the turbo's compressor wheel. So, the BOV opens at (say 17psi) venting the additional pressure back into the intake before the compressor.

Back in the 80s and 90s, as people started modifying turbo cars by upping the boost, the factory plastic BOVs would fail or leak leading to vendors introducing better versions including those that would "vent to atmosphere" making noise while doing it. Like many hot-rodding ideas, the sound of the blow-off venting implied high performance- sort of like a loud exhaust.

In the real world of turbo cars built in this century with variable valve timing and electronic throttles, depending on how the tuning is done you don't need a blow-off valve at all. Later STs do not have a blow-off valve. So yeah, it's just for noise.

Excellent answer.

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TMac · Jun 21, 2022

BOVs were covered substantially in another thread. Sometime in mid-year '21 Ford eliminated it from the ST. And if you're wondering what replaced it:

https://www.explorerst.org/threads/2021-st-bov.2576/post-33735

Rocketw19 · Jun 21, 2022

TMac said:

The original purpose of the BOV was to eliminate boost spikes during shifts or rapid throttle transition. If you were rushing along at full boost (say 15psi), and closed the throttle, the pressure from the compressor would build up substantially with nowhere to go. This could lead to a "stall" condition which could damage the turbo's compressor wheel. So, the BOV opens at (say 17psi) venting the additional pressure back into the intake before the compressor.

Back in the 80s and 90s, as people started modifying turbo cars by upping the boost, the factory plastic BOVs would fail or leak leading to vendors introducing better versions including those that would "vent to atmosphere" making noise while doing it. Like many hot-rodding ideas, the sound of the blow-off venting implied high performance- sort of like a loud exhaust.

In the real world of turbo cars built in this century with variable valve timing and electronic throttles, depending on how the tuning is done you don't need a blow-off valve at all. Later STs do not have a blow-off valve. So yeah, it's just for noise.

you reply's are always so informative, thank you!

Shawn528 · Aug 17, 2023

Stinger said:

I was worried a BOV would put me in the Paul Walker Fast n Furious category. It’s not loud around town when driving normal. At lower levels of boost it’s barely noticeable in the cabin. I installed the purple sound tuning insert to give it a lower sound. It has a nice low hiss. Install was straight forward on the fenfab pipe, but the c clip was a PITA. You’ll need c clip pliers. I got a set on Amazon in a nice soft case for a reasonable price. Make sure it’s seated properly and the clip is all the way expanded or you’ll pop the BOV right off. Don’t ask me how I know. Might want an extra gasket too. Overall, I’m happy with it and glad I went with an aftermarket BOV.

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Did you jus cut the stock line to put the T adapter in?

KoolAl44 · Dec 19, 2023

Curious also. Did you get yours figured out?

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