Need opinions - Page 2 - Subaru WRX Forum
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#16 Old 11-04-2013, 02:41 PM
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So the ECU is still dumping the same amount of fuel into the system, there for causing a rich condition, which it then tries to correct, but since it only knows this after you have let off the throttle it has to recalculate, by then you are back into the throttle again and it goes through the process all over. This rich condition can eventually cause your oil to become thinner because excessive gas is leaking passed the cylinder walls and getting into the oil pan, this in turn will ruin your motor. Which in turn you will blame Subaru for building a crap car. So what we are trying to say here is stick with the stock BPV and you'll be a lot happier...
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#17 Old 11-04-2013, 04:21 PM
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I can't believe you got Keith to give a direct and factual answer! Wow, happy days are here again

Quote:
Originally Posted by Scooban00b View Post
lol..


Still no technical facts backing up everyones opinions.
*checks title of thread*. Yup, still there.

BOV's waste cooled, pressurized intake air on making a fart sound when it could be helping reduce spool times in the next gear. They also drive your ECU nuts because it couldn't guess you liked fart sounds that much.
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#18 Old 11-04-2013, 05:13 PM
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--fol!!--
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#19 Old 11-04-2013, 05:21 PM
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Originally Posted by mosc View Post
I can't believe you got Keith to give a direct and factual answer! Wow, happy days are here again

*checks title of thread*. Yup, still there.

BOV's waste cooled, pressurized intake air on making a fart sound when it could be helping reduce spool times in the next gear. They also drive your ECU nuts because it couldn't guess you liked fart sounds that much.
Today I didn't even have to use my AK, thought it was a good day.
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#20 Old 11-04-2013, 05:42 PM
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Ice cube?

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#21 Old 11-04-2013, 05:50 PM
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Quote:
Originally Posted by psinuse View Post
Today I didn't even have to use my AK, thought it was a good day.
Another bov thread can we just have a file for all these?


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#22 Old 11-04-2013, 05:52 PM
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Do we have at least a sticky?
Hmmm, I'll check

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#23 Old 11-04-2013, 05:57 PM
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Quote:
Originally Posted by Kobiyashi View Post
They sound really, really, really, cool; if you are into RICE or (APC) it's a must!!!!

lol

-kobi
Haha, found this in our very old and outdated sticky.... Fol

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#24 Old 11-04-2013, 09:26 PM
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Originally Posted by psinuse View Post
So the ECU is still dumping the same amount of fuel into the system, there for causing a rich condition, which it then tries to correct, but since it only knows this after you have let off the throttle it has to recalculate, by then you are back into the throttle again and it goes through the process all over. This rich condition can eventually cause your oil to become thinner because excessive gas is leaking passed the cylinder walls and getting into the oil pan, this in turn will ruin your motor. Which in turn you will blame Subaru for building a crap car. So what we are trying to say here is stick with the stock BPV and you'll be a lot happier...
Based on this information, why is it "oh so bad" because my car is stock, yet if it was built pushing 20+ psi it wouldn't be? What is everyone in the 350+ club doing?



Surprised most hasn't seen this..

Quote:
Originally Posted by Davenow View Post
OK!

Based on the recent influx of BOV related posts, and the ensuing garbage that many people have posted in reply to these, I have decided to make up a small FAQ to try to squash some of the rumors and just straight up bad information out there.

Yes, Unabomber has an FAQ on this. The fact is that it doesnt "get to the point" fast enough for most people to get the point. This is written more bluntly, addressing some issues head on.
We dont need 329872389472387 bits of data and links to valves. We need misconceptions fixed, and we need people to stop repeating the same bad info over and over. Or at least hopefully slow it down a little bit

First, some vocab, since some dont know what it all means

VTA=Vent to atmosphere
-this is the noisey style that is the most popular. 90% of BOVs out there are fully VTA (meaning they vent 100% into the air)
Recirc
A BOV that dumps the vent back into the intake stream. Before the turbo, after the MAF sensor.
50/50
Vents half into the intake, half to atmosphere. Makes some noise, doesnt swing as rich. Typically these are set up sequentially, so that on light vents, it dumps 100% back into the intake, this is so that at light boost/part throttle you get no rich condition, and no/less noise. At higher boost, the valve opens all the way, and dumps into the intake and atmosphere.

Now lets clear a couple things up. If it seems like I am pro-bov, just read everything. I get to the down sides further down.

1. BOVS make you run rich.
--No they do NOT! Here is why. When you are idling, driving around, and under boost, the BOV is CLOSED just like stock. The only way to be running rich is if the BOV was somehow letting air out post maf, WHILE RUNNING, constantly. The exception to this would be a valve that is leaking REALLY badly, and in a case like this, you will know there is a problem right away anyway, as the car will probably barely run. For it to leak this badly, it would have to be physically damaged or just REALLY f'd up :lol:


2. But what about when you shift? Arent you rich then?
--Yes. BUT, you need to understand a couple things.
First-The rich condition is not THAT rich. On most tunes the target A/F under boost is @11.1-1 or so. Say you are at 11.1-1, then you shift and it vents. It will swing rich, typically to around 9.5-1. That is NOT that rich.

Second- The rich condition does not last very long. On a typical datalogger, the rich condition takes up no more than 2 rows. You are rich for well under a second.

3. I heard its bad for my cats!
--Its not great for them, but its not really enough to shorten their lifespan in any meaningful way. Exactly how long are you planning to keep the stock cats or even keep the car anyway? Seriously, there are guys running around with 100k+ on their car, totally stock exh, with a bov. No cat problems. If you have a VTA blow off valve, and you lose a cat, you would have lost it anyway, because either the cat was bad to begin with, or your vehicle has some other issue

4. But people will think I am a ricer!
--Did they pay for your car? Are they making your loan payments? Will them thinking this stop you from getting laid? Exactly, then tell them to die in a fire and enjoy your BOV if that is what you want.
It should be noted however, that if you are the type of person that doesnt like people trying to race them, you may want to stay away from a BOV simply because so many ricers think that everyone with a BOV wants to race.

5. I heard that if I want one, I should do a 50/50 venting BOV.
--These are somewhat pointless. You still get the rich condition, just not quite as badly. However, it isnt that bad anyway to begin with. These are however good for people that want a little noise when they are on it, and little to no noise when they arent on it hard. Dont fool yourself into thinking that you wont run rich (because you wont "run rich" with a fully VTA valve either), you still dump post MAF air when it vents, so you still get a rich spot when it vents.

6. But I need one because I run more boost than stock.
--In most cases this is not true. GENERALLY the stock valve can be trusted till @20PSI. Some leak a little bit after about 18PSI, but 90% hold rock solid till about 22PSI, and 99.99999% hold solid at 20PSI. If you are planning to run more than 24PSI, you may want to consider going aftermarket. Over 26PSI, you need to either mod your BOV, or go aftermarket.

7. So BOVs are fine? I can run one with no real downsides?
--Not always. MOST aftermarket valves leak. A leaking BOV, DOES slow you down, and can over time, damage things. To make matters even worse, 99% of people who buy BOVs, dont know how to, or bother to, take the time to set it up properly. So even if they bought a quality valve, it may be leaking.

8. I have had XXXX brand valve for years, it has never leaked.
--How do you know? By looking at your boost gauge? Looking at the boost levels in your datalog? Niether of those prove that the valve isnt leaking.

9. Ok so how do I set my BOV up, so that it doesnt leak/stands less chance of leaking?
--Read the manual first off. Learn how to adjust it. If it doesnt have a manual, just look at the valve. You can almost aways figure out how to adjust it. Some have screws and such, some use washers under the spring. Others use replacement springs.
Now that you know how to adjust it, here is what you do.
First off, start the car, get out and open the hood. If you can see the piston of the valve (look in the hole it vents out of if its a VTA valve), check to see if it is moving at all at idle, or worse, partially open. You want that piston rock solid not moving at idle.
Now give it a little gas. It shouldnt move when you step on it, and when you lift, it should pull up a bit. Depending how hard you hit the gas, it will either JUST move, or fully open.
If its doing anything but what it should be, adjust it a little tighter.

Now go drive the car

When you shift at light throttle, is it venting? If so, is it a pure straight vent, or do you get a little bit of a "chufchchchc" noise right before it vents? That noise is compressor surge. Which isnt as bad as some people like to think and say. Ideally, you are looking to hear a little surge then a vent. Or no sound at all. Either is ok. Now drive it hard, does it surge a little or just straight vent?
Get out of the car and tighten the valve and drive it again. Repeat this until you get a LOT of surge when you lift under boost. Now start loosening it until you JUST start to hear no almost surge.
What the surge means is that it fought opening just a little bit. If you hear a LITTLE surge just as it begins to vent, that means that the valve is holding itself shut as tightly as it is capable of, without being so tight that it doesnt vent properly.

10. But OMG, compressor surge is horrible for your turbo!!
--Unless its really bad, it really isnt going to kill it. I had a conversation with Corky Bell (Author of MAXIMUM BOOST) during a BBQ at his shop about this exact subject and he assured me that compressor surge was nothing more than a bad sound, and that his early miata turbo kits didnt even use one, and never had problems with losing the turbo. This goes against everything I had previously heard, but as one of the godfathers of turbocharging I am going to take his word for it. This guy knows more about the subject than 90% of nasioc all added together.




Bottom line is this.
If you are wanting to be 100% sure you arent losing any power from it, and you are running under about 22PSI, you are best off sticking with stock. If you REALLY want the sound, then stock with a GOOD valve. You would be suprised at how many big name and very popular valves are junk.

Generally you can trust
TurboXS, APS, Perrin, TIAL (best one out there), the HKS RACE valve (not the SSQV) and a couple others. There is one very popular brand that makes a lot of 50/50 style valves, I am not going to name names, but searching my name and BOVs should bring it up. Its 3 letters and they are known for 50/50 valves.

How do I know this? Like what am I using to base my opinions?
I spent a good long time several years back testing valves. As many as I could get my hands on. Buying, borrowing, trading, you name it. All in all I had easily 30+ valves on my car. Multiple examples of the same valve whenever I could, to help eliminate the chances of getting just an extra bad (or extra good!) valve.
I was shocked at what I found. Almost all leaked.
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#25 Old 11-04-2013, 09:44 PM
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Quote:
Originally Posted by Scooban00b View Post
Based on this information, why is it "oh so bad" because my car is stock, yet if it was built pushing 20+ psi it wouldn't be? What is everyone in the 350+ club doing?
Not one person has said that's the case.

Quote:
Originally Posted by Scooban00b View Post
Surprised most hasn't seen this..
Surprised you didn't read it very thoroughly.

7. So BOVs are fine? I can run one with no real downsides?
--Not always. MOST aftermarket valves leak. A leaking BOV, DOES slow you down, and can over time, damage things. To make matters even worse, 99% of people who buy BOVs, dont know how to, or bother to, take the time to set it up properly. So even if they bought a quality valve, it may be leaking.

Exactly as I said in my post.

And #4 is not the Davenow I know.
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#26 Old 11-04-2013, 10:15 PM
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Originally Posted by brfatal View Post
Not one person has said that's the case.



Surprised you didn't read it very thoroughly.

7. So BOVs are fine? I can run one with no real downsides?
--Not always. MOST aftermarket valves leak. A leaking BOV, DOES slow you down, and can over time, damage things. To make matters even worse, 99% of people who buy BOVs, dont know how to, or bother to, take the time to set it up properly. So even if they bought a quality valve, it may be leaking.

Exactly as I said in my post.

And #4 is not the Davenow I know.
I have read it, many times. Which reassures me everything will be fine. I didn't expect anyone to tell me how to mod MY car. If someone doesn't mod their car the same way everyone else does.. same wheels, exhaust, lip or whatever they get flamed. I asked specifically for opinions on this EXACT valve from people with FIRST HAND EXPERIENCE with it.

Now you uninformed people come to share your "omg bov, your car go boom, rice, newb" that was bestowed upon you when you were a noob, on to other people.

I read up on everything and im modding my car based on decisions I've already made. I'm getting a valve plain and simple. I'm looking at getting the one I posted which is why I asked for reviews from people who have had THIS valve. Go flame someone else since obviously none of you have experience with this valve and can offer no educated opinion on it first hand.

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#27 Old 11-04-2013, 10:45 PM
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This conversation is over. You asked for opinions, you got them, and then you directly insulted those to gave you their opinions. Nobody said car go boom or newb. However, you said "you uninformed people", which is unacceptable. Since you clearly don't want to hear what any of us have to say, there's no point in continuing this conversation. Locked.
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#28 Old 11-05-2013, 12:31 PM
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After reviewing the thread discussion, Mosc's decision to lock the thread is acceptable per our forum rules. Although the discussion was not about the exact BOV in question, the members questioned the use of one for YOUR benefit. Obviously, you don't have to listen. But when personal attacks are introduced into the discussion, it's grounds for having your topic locked.
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