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Old 09-04-2006, 08:08 PM   #1
snowscoob
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Subaru Stars Newb question (somebody educate a new CO guy!)

so i recently bought a 02 wrx and was gonna do some small mods nothing out of control but my question is should i replace the stock bypass with a bov or leave the bypass give me your opinions guys thanks
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Old 09-04-2006, 08:11 PM   #2
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if you dont plan on putting any serious numbers to the ground, running a BOV wont hurt.... if you are planning on putting serious numbers down - keep your BPV or buy a recirc.... just dont go atmospheric

But atmospheric on a mostly stock motor isn't going to hurt anything (granted you have an UPPIPE!)

I have a turbo xs RFL.... $200 with flanges/shipping new I'll sell for $150... Has 3000 miles.
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Old 09-04-2006, 08:27 PM   #3
FromageTheDog
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I'm sure the experts will correct me if I'm wrong, but my $0.02: If you're wanting to hear the wooshy vent noises, you might want to consider the SPT intake as a more effective use of your money. BOV buys you nothing, other than noise.
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Old 09-04-2006, 08:37 PM   #4
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[quote=page02wrx;15128419]if you are planning on putting serious numbers down - keep your BPV or buy a recirc.... just dont go atmospheric

But atmospheric on a mostly stock motor isn't going to hurt anything (granted you have an UPPIPE!)

QUOTE]

why dont u want to go atmospheric if your putting out more hp?
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Old 09-04-2006, 09:23 PM   #5
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Quote:
Originally Posted by snowscoob View Post

why dont u want to go atmospheric if your putting out more hp?

cause if you dont get tuned for it, that motor gets so hot that unburned gas could detonate

kiss your connecting rods goodbye if that happens
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Old 09-04-2006, 09:30 PM   #6
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Quote:
Originally Posted by page02wrx View Post
cause if you dont get tuned for it, that motor gets so hot that unburned gas could detonate

kiss your connecting rods goodbye if that happens

Uh...that's not correct.

The only reason you should not run an atmospheric BOV is because the motor runs rich for a split second because it's adding more fuel that in should thanks to the MAF sensor setup. The air is already metered and the engine thinks that all of the air that you just blew off into the air is still going into the motor. The only thing you will hurt is the catalytic converter in the up pipe.

In short, aftermarket BOV's are absolutely worthless on the stock setup.
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Old 09-04-2006, 10:33 PM   #7
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page02wrx doesnt knwo what hes talking about. blind leading the blind. get a intake, full aps settup if you want the noise. do not on a stock settup get a blow off valve. just dont do it.

if you upgrade you need to get a bov, but only if you seriously upgrade, full turbo and everything. the stock valve cant flow teh air that a bigger turbo puts out. that and it can leak.
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Old 09-04-2006, 10:47 PM   #8
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BOVs = Rice
CAI = Pointless
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Old 09-04-2006, 10:53 PM   #9
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Quote:
Originally Posted by Anub1s View Post
Uh...that's not correct.

The only reason you should not run an atmospheric BOV is because the motor runs rich for a split second because it's adding more fuel that in should thanks to the MAF sensor setup. The air is already metered and the engine thinks that all of the air that you just blew off into the air is still going into the motor. The only thing you will hurt is the catalytic converter in the up pipe.

In short, aftermarket BOV's are absolutely worthless on the stock setup.
The motor runs rich every time you either let off the gas or shift, and its not rich because its adding more fuel - its add the same amount of fuel but the air isn't there. The only thing you will hurt is the cat on the uppipe? Wrong. Running rich with bad plugs on a very hot engine will cause detonation/pre ignition because engine temperatures are so hot it causes the unburned gas to combust, similar to a diesel engine only it happens when you dont want it to.

If that pistons coming up and that unburned gas combusts - uhm see ya connecting rod
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Old 09-04-2006, 10:54 PM   #10
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i read the second post and was like

the specialist know what they're talking about on here
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Old 09-04-2006, 11:06 PM   #11
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Quote:
Originally Posted by page02wrx View Post
The motor runs rich every time you either let off the gas or shift, and its not rich because its adding more fuel - its add the same amount of fuel but the air isn't there. The only thing you will hurt is the cat on the uppipe? Wrong. Running rich with bad plugs on a very hot engine will cause detonation/pre ignition because engine temperatures are so hot it causes the unburned gas to combust, similar to a diesel engine only it happens when you dont want it to.

If that pistons coming up and that unburned gas combusts - uhm see ya connecting rod
Seriously, stop, you're killing me
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Old 09-04-2006, 11:16 PM   #12
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leave the recirc valve. it seems to me that my car runs smoother and not as rich.
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Old 09-04-2006, 11:26 PM   #13
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i have a SSBOV(hks).... it doesnt do sh.t. ...... besides the noise i was lookin for.... i have stage2 in my car... im not tune.... nothing really happens... besides the fact that that car becomes a bit slower.... n the iddle messes up.... im getting it tunning cuz i have a set up for power that im not getting .....

in other words..... if ur not tune or build for a BOV is better to keep the stock set up.... i dont have any regreats.... i wanted that noise.... even if i had to sacrifice some time or hp on the dyno.....

Last edited by JDM Scooby; 09-04-2006 at 11:57 PM.
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Old 09-04-2006, 11:32 PM   #14
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......ok........cool.........i.....like...your.... .explanation...about blow off valves...........
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Old 09-04-2006, 11:40 PM   #15
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i am learning so much from this thread!!!!!!!1!!11!

THANKS GUYS!!!
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Old 09-04-2006, 11:48 PM   #16
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Quote:
Originally Posted by page02wrx View Post
The motor runs rich every time you either let off the gas or shift, and its not rich because its adding more fuel - its add the same amount of fuel but the air isn't there. The only thing you will hurt is the cat on the uppipe? Wrong. Running rich with bad plugs on a very hot engine will cause detonation/pre ignition because engine temperatures are so hot it causes the unburned gas to combust, similar to a diesel engine only it happens when you dont want it to.

If that pistons coming up and that unburned gas combusts - uhm see ya connecting rod
Dude, I tried to play nice. What exactly do you think running rich means? If there's more gas in the combustion chamber than there should be according to how much air is in there, it's called running rich. It registers on O2 sensors as a lower stoichiometric ratio as well as lower exhaust temperatures, in case you didn't know that.

Running rich is MUCH better than running lean on an engine. If the explosion becomes too powerful it could crack a ring land or even cause the piston to shatter. It happens all the time when running lean. Running rich will cause a fouled up plug and a clogged up cat. That's about it. There is no gas hanging around to detinate after the power stroke. It's all burned because 1) the temperatures are too high for gas to NOT ignite, and 2) because gas does that. There is no secondary injection that will cause gas to linger and suddenly explode.

Do you have any idea how hard it is to break a connecting rod? In the case you've chosen, the piston would go before any connecting rod would.

Where are you getting your information?
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Old 09-05-2006, 12:02 AM   #17
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Aaaaaand, we're done
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