yeha i bought a evolution DV and did the air box mod, you can't hear it, but i am sure its cuze the cra doens't produce enough boost, once chipped i am positive you will be able to hear it, and yeah i would agree dv and BOV are baout the same, diffrence beign the diverter valve has a hose connected to the exit end and throws air back into the turbo compressor side, where a BOv could if you hooked the line up, but i am thinking you will loose very very little power doing a bov into the atomosphere and not into the turbo, as that little air pushed into the compressor wheel could help it spin a couple rotations faster, just theory, some guy should dyno these theory im interetsed, anyone feel free to criticize or change my theory thanks

 

I really doubt recirculated BOV air would have enough velocity or even volume to increase the rotational rate of the blades which are already spinning at a high rate considering you just finished building boost.

And really, they're not about the same - they *are* the same. Some BOVs are recirc BOVs, some aren't.

1- You can buy a BOV that vents to the atmosphere
2- You can buy a KIT that redirects your atmospheric dump back into your intake, post MAF
3- You can buy a BOV that recircs to the intake, post MAF, the EXACT same way (with a tube) as a "DV".
4- You can buy a "DV" and be part of the elite group. (looks alot like #3 eh)


Honestly, a BOV and a DV are the exact same thing, just a different name.

 

All that being said, I suppose to help n00bs or just to simplify things... some uber tun3rs started calling BOVs that recirc "Diverter Valves".

BOVs have the ability to recirc or vent. DVs can only recirc.

 

Our stock boost levels are what-7-8psi? If so what makes it so different from one car to the next when boost is concerned for our BOVs/DVs to make a sound. while an hks is ssqv, and should open at very low levels of psi, a ton of spring loaded bovs will make plenty of noise at low boost levels (6-9psi) on somethiing like a civic, or my last celica, tons on noise, 8psi.

 

can we make that a sticky somewhere, haha

 

no it cant be a sticky, because its biased, that would be like me getting a sticky bashing bovs and praising dv's
yes they are the same thing, i just dont like bov's for an audi
you are more then welcome to do whatever you want wit your car after all, you paid for it

 

How is it biased? It's not an opinion, it's a fact. I'm not bashing DVs, not at all - please don't misunderstand. I'm only trying to help educate those who vehemetly INSIST on separating the two and bashing those who call it a BOV. And i'm not askin for anything to be stickied, hopefully this thread will stick around for when someone does a search and helps clear the air. It doesn't need to be up at the top for all to read.

Isn't that a contradiction? If they're the same thing, as you said, then you don't like DVs for an Audi?

It's like arguing between "windshield" or "windscreen". One isn't more right than the other and neither are wrong.

A "blow off valve" is a diverting valve. It's also a pressure-release valve. It's also considered a pop-off valve.

Now i'm off to find the brick wall that has Jeff's forhead inprints in it. [sm=headbang.gif]

 

im not arguing what it should be called, yes it does the same thing, but it is still a different product, where as a windshield and a windscreen are the same product, just with differnt names based on geographic location

 

it dosent have anything to do with hp. last time i checked your not making any power when you shift or get off the gas. it you have a vta bov or dv then your making your car run rich when ever you shift. also it *can* not always but it can mess up your idle badly. i never had this problem but with evos it will make the car run so bad that it will stall out lots of times.

 

Hmmmm, this is turning into a pissing match without anything happening.

They're the same damn thing

Blowoff Valve = Diverter Valve
Diverter Valve = Blowoff Valve

and yes, the "I don't like BOV's on Audis" is definately a contradiction

As long as its recirculating, thats all that really matters, it gets the job done right, and IMO is tighter, why? because so many of you said it couldn't be done, and to the best of my knowledge not understanding it follows the exact same theory/principal of a Diverter Valve. Props to the OP.

I'm so glad I have a 30V so I don't have to worry about who's gonna think what if I put this or that on my car... **** It, its your car, do what you want... good call.