Hey Guys and gals, new owner of a 08 sstc. This is my first turbocharged car and am a little fuzzy as to how the Turbo works. Im a Chevy salesman and know a thing or two about a thing or two but with this new turbo theyre using I saw something that looks like a stock blow off valve. if it is, how well does it work compared to an aftermarket valve? i know the sound is sweet with an aftermarket but if this one does the same without the sound then i wont want to change it..... what are your opinions and insight?

 

o man...

search it dude
they dont have one out yet for your car

 

my fingers are bleeding from the constant googling. couldnt find a thing. i guess time will tell?

 

You're looking in the wrong place. Look through the threads in teh LNF tech section, you will learn a lot about his little motor.

 

search this site man

::searchbutton::

 

You don't have a BOV
You have a recirculating bypass valve.

 

and welcome!

 

oh. ok thank you.

plan on it. still finding out where everythings at.

 

Yeah instead of venting off into the atmosphere it is recirculated into your intake.

 

Right on. i will look for more info on it in the correct sections of this website. Dont want to upset anyone for posting something in the wrong section.

 

Subie owners call them recircs or BPVs. I know that on subies if you buy an aftermarket bov for the car it will actually hurts the cars performance. unless you have done some serious modding to the car. I don't know if this will happen on the ss/tc.

 

yes, you can actually hurt, and loose boost if your using an aftermarket "bov"
it happened to my buddie's wrx

 

That's because it's something that requires tuning afterwards.

 

It's cool, yeah the LNF has a "bypass valve" that re-circulates the air back into the engine or manifold to be more specific? I'm not an expert either...

But I do know a thing or two about this because a buddy of mine has a Jetta GLI 1.8T with the same set-up...

So basically converting to a universal BOV, that you would put on traditional turbos will give you that "Whoosh" sound but will not be good for the turbo and engine...

Now with the other cars like the Jetta 1.8T that I mentioned above they do offer half-atmospheric bypass valves... ( know they do for Solstice GXP/Sky RL) but I wouldn't know if that would work on the Cobalt...

Basically you won't want to touch the bypass valve unless you swap out the stock turbo with a bigger turbo, then you can get whatever aftermarket BOV you want...

If you want to hear the sound of the back pressure from the turbo, your best and safest bet is just to get a CAI...

 

When i bought my wrx it had a aftermarket bov and it made it bog down a little when you shifted. I bought a stock one and it was like night and day.

 

BOV, bypass valve...its all the same thing just so everyone knows this. BOV is what most people call them. The technical term is recirculating bypass valve. A "BOV" can also be recirculated into the intake just most people like the sound so they dont.

The reason why it is there is to prevent compressor surge when the throttle plate closes. Compressor surge is when the boost in the intercooler and piping hits a closed throttle plate and surges back into the turbos compressor... this is a bad thing.

Usually what happens when you put a "BOV" that vents to the atmosphere...metered air(air acounted for by the computer by means of mass airflow sensor, map sensor) excapes the system. The computer still thinks the air is in the system and adds fuel accordingly. This causes a rich condition whenever you let off of the gas.

I can tell not many people on this forum have had turbo cars before. I have had 5, I can see there is much teaching to do...

 

BOV - vents to atmosphere

BPV - recirculates the air back before the MAF

 

BOV is a coined term its the same thing they do exactly the same thing its how it is plumbed or not plumbed for that matter that is different. They are also known as compressor bypass valves.

 

True, I'm just going with the way a great many people understand it as.

 

and if it was plumbed back to before the MAF it would do the same thing as dumping to the atmosphere The computer would still think the air is in the system when its not.

I just hate when people want to get a BOV just because of how it sounds not because of function. I mean seriously its like putting a potato launcher on a honda lol

 

I forget...it's late. Goodnight...

 

Its funny that you say that because my Wife knows pretty much nothing about cars, and she loves the sound of a BOV. Hell I was with my Mom the other day and there was a WRX with a loudass BOV and my Mom started talking about it, and then my Mom told my Wife about it and my Wife was like, "I love that sound, and I want one for the car". I thought it was funny that my Wife and Mom were talking BOV's.

 

AAAAAAAAAAACHHHHOoooooooooooooooooooooooo

 

Hey I have a question... of the 2 cars in your sig, which is quicker? just out of curiosity. Everybody is always saying this or that but you own them both... should be a pretty honest answer

 

+1

BOVs are loud, bypass valve are suddle