Go BOV Yourself!!! - Page 2 - Subaru WRX Forum
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#16 Old 11-14-2013, 05:58 PM
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No one even noticed that my post was from 1969....Thanks guys for caring....

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#17 Old 11-14-2013, 06:12 PM
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I did! I've seen it before too I believe. When I was RESEARCHING !!!!
You know, that thing idiots don't know how to do!!!!

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#18 Old 11-14-2013, 08:35 PM
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I think it's when you post on the computer and then see it in the app.
I've seen it many times from different people

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#19 Old 11-14-2013, 10:23 PM
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Quote:
Originally Posted by psinuse View Post
No one even noticed that my post was from 1969....Thanks guys for caring....
I saw it...it was when the servers screwed up the dates. Just funny that it kept it that way.

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#20 Old 11-25-2013, 08:43 PM
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Are blow off valves bad for the turbo????

Oh , Another..... No way!!!!
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#21 Old 11-25-2013, 08:46 PM
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We need the facepalm meme ASAP! Lol....


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#22 Old 11-25-2013, 10:06 PM
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#23 Old 12-01-2013, 06:42 AM
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Damn photo button is gone again!!!

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#24 Old 12-01-2013, 10:32 AM
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Yeah Randy it is because your about to upload a million photos of bov haha nice photos too
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#25 Old 12-01-2013, 03:24 PM
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I know what Randy wanted to upload. I got your back man lol!

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#26 Old 12-01-2013, 05:14 PM
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But I want everyone to know I have a turbo! How are all my Honda friends gonna know I have a turbo without the PShhhh?

FOL
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#27 Old 12-02-2013, 03:29 PM
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Just to clarify for anyone reading this thread that is unfamiliar with how BOV and BPV work here are a few key points:

* Blow Off Valves (or BOV for short) can be used as "Vent to atmosphere". Meaning they release pressurized air to the atmosphere when opened.

*Most modern vehicles use MAF (Mass Air Flow) or MAP (Manifold Absolute Pressure) and sometimes a combination of both to determine the amount of air entering the engine for fuel calculations.

*MAP tuned vehicles can generally use vent to atmosphere type BOVs just fine.

*MAF tuned vehicles or MAF and MAP combo vehicles are much more sensitive to "Vent to Atmosphere" type BOVs.

*Most BOVs can be used in a "recirculating mode" making them fine to use on MAF tuned vehicles.

*Some "Bugeye" 02-03 WRX vehicles use or can use MAP only tunes, making them more lenient to airflow modifications such as vent to atmosphere BOVs.

*Some BPVs or BOVs are available in "Hybrid" types which offer partial vent to atmosphere and partial recirculation for better driveability (The COBB XLE is like this).

There are tons of other factors that should be considered when choosing parts for your car. As with most things in life, the right answer for some is not always the best answer for all, so the best thing to do is to read up, educate yourself and don't be afraid to ask questions.

Bottom line is that BOVs work well for many people, but can introduce complexity if not setup correctly.

Hope this helps!


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#28 Old 03-17-2014, 09:11 PM
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Blow Off Valve FAQ: Read if you are thinking of buying one! - NASIOC

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#29 Old 03-19-2014, 09:11 PM
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Not sure if this has already been posted but it's helpful. Apparently adjustable spring BOV's will work better.

Posted by Phatron
PhatBotti Tuning - Tuning FAQ & Misc Info - NASIOC

Blow Off Valves (BOV) & By-Pass Valves (BPV)

By-Pass Valve - does exactly what the name suggests. when you let off the gas and the throttle closes, the BPV opens to BY-PASS the turbo and send the air back to the intake. This has 2 benefits...it prevents compressor surge and at the same time utilizes that pressurized air to keep the turbo spooled when shifting.

Blow Off Valve - Blows off air to atmosphere at throttle lift. Bad for MAF based vehicle since you are releasing air measured by the MAF...this makes the car run rich and blow fireballs when shifting. BOV's only prevent comp surge and the turbo will slow more while shifting compared to a bpv since the air isnt recirculated to keep the comp spinning.

In both cases when you lift of the throttle the pressurized air now takes the path of least resistance.....if you put a 30 psi spring in your bpv and you're running 20psi and you let off the throttle....the spring is going to be too tight to open so the air has to go somewhere....which is through the compressor backwards. Thats compressor surge. You're shoving air through the compressor backwards.

BPV's and BOV's dont do anything at WOT...unless they are leaking. Their main functions (preventing compressor surge and utilizing the pressurized air to keep the turbo spooled while shifting) happen when you let off the gas.

I recommend the forge race bpv with spring kit or a Tial bpv with spring kit. The spring kits add adjustbility that stops them from leaking at idle. The HKS SSQV is the worst valve on the market...stay away at all costs.

.....Its not only the HKS BOV.....its most on the market. All the bov's come with chitty weak springs that leak at idle. Basically i like any bpv/bov that has a spring kit and is adjustable.
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#30 Old 03-26-2014, 10:49 AM
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If anyone is looking for a BPV/BOV that is adjustable, both COBB and PERRIN have options that are adjustable and can be recirculated to prevent venting metered air on MAF cars.

Import COBB Tuning XLE Blow Off Valve (BOV) at PRO Import Tuners

Import Perrin Recirculating Blow Off Valve at PRO Import Tuners
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