what is the best bov for my cobalt ss turbo 09?
what i need and how much will it cost

i heard i couldnt install a bov if i dont change my stock intake...is it true


thx

 

BOV? no you don't need that. Just take off the intercooler piping and run it open. That way it's much louder. Also take off the exhaust manifold so your exhauts is louder

 

The best bov is the stock one, don't touch anything.

 

some people are such dicks for no reason at all, he didnt ask you opinion on if you think he needs one or not he asked what he needed to run one so ******* comments like take off you exhaust manifold? come on give people a break sometimes.

i have a BOV for my 09 but i havent installed it yet. i wouldnt recomend running the stock intake with it tho mainly because that **** is plastic and its not that great although with a drop in it might work. you need a block off plate that can block off the original BPV and new charge pipes with a flange welded on to run the BOV.

i think clearimageauto has a complete kit that you need and sells it at a nice price so pm dan from clearimage and see what he says. i believe the entire kit is like 500 tho which is a great price since i paid about that just for my Hahn charge pipes alone.

 

The factory BOV is more then sufficient. Spend money where it matters.

 

The real answer here is that you can't run a BOV on these cars.

People do it, but its not good.

Its not something specific about the Cobalt SS that says you can't run a BOV, its the fact that these cars use a MAF to calculate fueling, among other parameters.

When you install a BOV, you're venting measured air to the atmosphere that the ECU has already calculated will be enterting the engine. This throws off many things, not the least of which is your A/F ratio. It also throws off the O2 feedback, since the ECU is expecting the A/F to be directly correlated with the MAF readings.

Bottom line is, don't do it.

 

Almost all BOV's can be recirculated or come in a recirculated version.

 

So then in theory if the bov is before the maf then everythings gravy right?

 

Correct.

 

Of course, but a lot of people don't want to recirculate them. They just vent them to the atmosphere. If its recirculated, its basically the same as the stock diverter valve.

How could you have a BOV before the MAF??

A blow off or diverter valve needs to be installed between the turbocharger and throttle body. Putting it in the air intake tract will do absolutely nothing.

If you want to recirculate your BOV, you would recirculate the air between the MAF and TB, not before the MAF. The air was already measured, don't want to measure it twice.

 

You can relocate the MAF to after the BOV.

 

which is what the kit does that CIA makes.

 

IF you are going to install a BOV relocate the MAF after the BOV and that way your A/F will not be off and all you will need to do is recalibrate the MAF with HP tunners or Trifecta, also you will need to get a new intake because you will have a hole where the MAF was.

 

^^ this basically sums it up really... it just a silly silly waist of money..

 

if you get the clear image kit he makes an adapter for the maf that screws into the intake maf pad to block off the hole.....esentially the stock bpv is good to about 22psi....anything higher it starts to act funny. some people say they are running a bov with no issues....my findings are they dont know they are having issues OR are running the bpv on top of the bov. best thing to do is relocate the maf to the cold side pipe and recalibrate the sensor via your prefered tuner.

 

save you money and get a cai from dan at clear image automotive and you will hear your stock blow off with no problem

 

I run a HKS BOV atmospherically, and I have no problems. And I dynoed just as high as others with the same mods, on a stingy dyno!

 

Here...read this thread, tells you everything you'll need...

https://www.cobaltss.net/forums/forced-induction-50/official-dejon-piping-install-thread-204185/

 

Another person who has no clue how a MAF system works.

It doesn't matter how high you dyno or that you "think" you have no problems.

There is no way you can vent air to the atmosphere after its been measured and not skew your MAF and A/F readings. If you got into your PCM with a scan tool you would be able to see where the fuel trims are trying to compensate for the skewed MAF readings.

Its not proper, thats the bottom line.

 

as totally right as you are, ignorance is such bliss for BOV fanboys.. lol

atmoshperic BOV definitely sound cool no doubt, but folks need to really understand what is actually happening when they do this. Even the CIA MAF relocation setup with trifecta's special tune specially designed for this mod, the success rate is at best 50%. This is coming straight from trifecta. ****, even Dan from CIA recommends NOT doing this and it's his own product. You can't change most people's minds though.

 

Eh...I thought they sounded cool at one point...then during my DSM days we rigged up my Laser with one...after a while I actually hated shifting just because of that retarded noise...BOVs are for SRT4s and those annoying kids with those VW 1.8t engines that think a loud BOV adds 7000hp revving at me like they are fast.

 

I love how people think they must vent their car to atmosphere. That's what all the cool kids do lol.

 

wouldnt it be more of a personal thing if you want a atmospheric bov? ( for the noise ) lol

 

Yea, honestly some models cars take better to vented bov's then others. These cars in fact work fine with vented bov's. oOOOOoooO NnooOOooo, not transient rich conditions in between shifts!! Its not like it causes the cars to die in between shift like evo's or other sensitive cars. Hurts the cars, somewhat, good for them... definatly not.

Its really not as bad as you kids make it out to be. Consistent richness under WOT or consistent richness cruising could start to cause a problem. I mean its not like your even going to 12 a/fr... which honestly isn't even THAT bad.

 

People like you go in the VTA fanboy status.