Good BPV?

Looking for a good BPV, not entirely a fan of the rubber diaphragm in the stock BPV for more than stock boost. What do you guys recommend? Not looking for BOV, since my research on those typically give us more lag and decrease power and responsiveness.

Im surprised not one has had any input on this

Akuto said:

Im surprised not one has had any input on this

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Do you have reason to believe the factory BPV is not holding pressure at increased boost levels?

A prominent tuner stated that “there is not an issue” with the stock BPV leaking - even at 31PSI.

Hollywoo0220 said:

A prominent tuner stated that “there is not an issue” with the stock BPV leaking - even at 31PSI.

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Came here to say the same. A new BPV might look nice as some extra bling but no way the stock one is limiting unless it's defective

360glitch said:

Do you have reason to believe the factory BPV is not holding pressure at increased boost levels?

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My reason is, over time, the rubber diaphragm in higher boost and with heat may cause it to leak or malfunction faster than a metal one. I've seen how they wear down faster and I typically recommend a metal one, I work with motors, pumps and piping and see rubber ones go out fairly quickly. I know it's not too serious for the cars, but I'd still like to change it out. I'm more upgrading little things that may go out sooner than other pieces. I do this with all my cars since I like to fiddle

@Akuto for fun I got the Boomba BPV, no issues been running for almost 10k miles
Installation was a pain. Do it when the engine is fully cooled.

bbdave said:

@Akuto for fun I got the Boomba BPV, no issues been running for almost 10k miles
Installation was a pain. Do it when the engine is fully cooled.

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I was thinking the same one and yeah, I've installed one on my buddy's car, it was mostly a tight squeeze and dropping shit

bbdave said:

@Akuto for fun I got the Boomba BPV, no issues been running for almost 10k miles
Installation was a pain. Do it when the engine is fully cooled.

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sorry to bring up an old post, but I’ve been trying to find sound clips for the Boomba BPV. I’ll admit... I mostly want the Boomba BPV for the sound considering the stock BPV is capable. In your opinion does the Boomba BPV give a better/different sound?

@AZCivicX I assume you are looking for your Coupe. Not trying to be mean, but you did post in the type R forum. I’m not sure what the current market is offering in terms of bpv. I will say for the 2.0L it was probably not worth the hassle of installation (did it mainly for fun, first turbo car). An intake will give you a very noticeable noise difference. It maybe changed the sound a bit but when running the stock intake it really isn’t noticeable with my setup. Maybe the 1.5L is different, not sure. Just changing the intake tube will make a difference, and it’s cheaper than a full intake.

Akuto said:

.
My reason is, over time, the rubber diaphragm in higher boost and with heat may cause it to leak or malfunction faster than a metal one. I've seen how they wear down faster and I typically recommend a metal one, I work with motors, pumps and piping and see rubber ones go out fairly quickly. I know it's not too serious for the cars, but I'd still like to change it out. I'm more upgrading little things that may go out sooner than other pieces. I do this with all my cars since I like to fiddle

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There have been no fails on the stock bpv

bbdave said:

@AZCivicX I assume you are looking for your Coupe. Not trying to be mean, but you did post in the type R forum. I’m not sure what the current market is offering in terms of bpv. I will say for the 2.0L it was probably not worth the hassle of installation (did it mainly for fun, first turbo car). An intake will give you a very noticeable noise difference. It maybe changed the sound a bit but when running the stock intake it really isn’t noticeable with my setup. Maybe the 1.5L is different, not sure. Just changing the intake tube will make a difference, and it’s cheaper than a full intake.

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Whoops just noticed this was Type R forum lmao. I searched the forums for any aftermarket BPV and stumbled across this one. I do have a prl cobra cai and love the noise it makes but was just wondering if the BPV would do anything as far as noise. But thank you for the response it was the answer I was looking for!

So I stumbled upon this thread after going too far down a rabbit hole one dusk. I'm in the middle of a personal build, and decided to give the Boomba BPV a try, which I found out to be designed for the Type R (like a lot of cool parts for this gen), but fits the Civic SI. I'll start with the desired result:

I wanted to achieve that flutter sound that I've heard friends and others speak so highly of. After reading through this thread, as well as a couple others, along with some YouTube videos, and random blog posts/articles about the topic, I decided to just drop some money and find out for myself if this product would satisfy the requirement.

In short, it did not.

Here's a link to some video clips I took using a GoPro Hero 8:
Comparison Clips: OEM vs Boomba Bypass Valve

The swoosh did not flutter, but it was a little more crisp (if that's even imaginable). To my surprise, there were a few other things that I noticed, but before I dive into the expectations I want to drop some text on what Boomba advertises on their product page:

This high performance recirculating bypass valve is precision machined out of aircraft grade billet aluminum which is far superior to the cheap plastic factory piece. It features an internal brass piston design and is pressure tested to withstand up to 75psi, allowing it to compliment even the most aggressive turbo builds. Spring pre-load determines the pressure differential required across the piston before the BPV opens and releases the pressurized intake charge. Designed to be a replacement for the OEM bypass valve and is available in 4 different colors.

No aftermarket tuning required. Will work on stock tune or aftermarket tunes. This piece does not throw any check engine lights, does not cause any turbo lag, and does not make the vehicle stutter between shifts.

- 100% recirculating
- Higher flow
- Tried and true brass piston design
- Pressure tested to 75 PSI
- Easy install
- No need for re-tune

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With all of that kept in mind, here are my observations upon less than a few hours of testing.

1. The boost felt more consistent - instead of the boost simply kicking in at the start of the power band, the transition felt more controlled, as if gently, but quickly, opening an airlock
2. Shifting felt more controlled as well, albeit a little stiffer - once you got into gear, it felt like the clutch caught on more evenly, and with a bit more demand. I do have the rev hang disabled through tune though, so this may affect some peoples' perspective
3. The needle drop on the tachometer was more graceful

These observations sort of correlate with Boomba's description of benefits, yet these same observations could all be placebo, and my mind trying to justify spending almost $200 on something which provides what the OEM equivalent achieves at a satisfactory and reliable level (hard maybe my BPV will last longer?). I respect the build quality, but I generally don't recommend this part. The closest analogy I can make, spoken by someone who originates from PC builds, is it squeezes that last few tenths of a GHz you need to make it to 5GHz, but at the cost of a custom loop water cooling system.

I'll keep the part on and let everyone know how it goes with respect to longevity.