Illegal BoV's

[DISIMS3]

To me the HKS valve sounds like a pigeon being runover (for your consideration).

[Doc]

ive never run one over...

I like my GFB valve.. Its well made.. simple construction and its not huge..

For what its worth

[Brackaus]

what's a GFB doc?

[Jmac]

Go fast bits

[Nirvandan]

To me the HKS valve sounds like a pigeon being runover (for your consideration).

Thats the best one I have ever heard

[Brackaus]

Hmm Digging up old threads,

Was talking to this dude at a Shop.. and also looking online as was asked about BOV's being illegal... found this:

"Some people have asked if whether or not venting the BOV to the atmosphere is legal. It is perfectly legal! Why? Because its just regular air... the air that surrounds us. Its just the air from outside that the turbo has sucked in.

Venting the WASTEGATE to the atmosphere on the other hand IS very illegal, because it is venting EXHAUST GASES to the atmosphere which to be legal, MUST go through the catalytic converter."

Interesting is that this is almost word for word what alot of shop keepers tell me, and surprising i have had one cop say that same thing. The only thing they can get you on was "excess Noise", but since that is up to the police officer.. who knows. IT's suppost to be under "ADR 28/83" but after reading it.. it's mostly about Buses and other useless crap (fuel usage)

Still reading it all.. found another website that is all about the rules of "ADR"... really interesting... for a police officer to get you on the "excessive noise" complaint, there are heaps of rules to do testing with... Might be reading this wrong, but for a 'moving' test, they have to have the mic 7.5m from the car? are they even going to measure that when they test?

The biggest thing i want to know is.. It's it really illgeal. I get heaps of talks about yes this is and no it isn't. It's not just BOV, is almost any mods. (eg FMIC, Gauges)

It would be nice to have a "Save Mod" thread, with Link or a image of the document to show what is and isn't?

just saying...

[Doug_MPS6]

There's way too much apocryphal crap talked about BOVs and BPV's and how they are "different" or "how they hold or don't hold boost" or any one of a thousand other myths. It's a snap to google the technicalities and understand what exactly goes on and what their purpose is.

They are essentially the same thing in engineering intent but differ in sophistication, design and functionality. I wouldn't stress too much over which is which. A bypass valve (BPV) as its name implies, simply bypasses. A blow off valve (BOV) may only VTA or in some cases may be able do both, as in the Turbosmart, which can be set up to VTA 100%, Bypass (recirc) 100% or 50:50 of either. Hence the need to stick to one term. I think most of us in the automotive context should be comfortable with "BOV" as a generic term and assume it refers to its intent as opposed to its precise functionality or destination of discharge.

But if you want to vent 100% to amosphere (100% VTA) - legally or otherwise - then the issue is backfiriing and excessive fuel washing off the lubricant on the cylinder walls, unless you set up your ECU to cut fuel at the time of throttle lift-off. Partial (50 Bypass:50 VTA) does not encounter the same issues but the BOV must still be setup to minimize backfiring.