QUESTIONS on BOV, Need advice

[ewyss]

I am new to dsm's, infact i have only had one other turbo'd vehicle and it was a diesel truck, and it had wastegates. I was wondering what the difference is between a bov and a wastegate and which one is better. Also i was told in one of my other threads that having a vented stock bov like i do now is a bad thing. Why is that. And lastly what would be a good bov to go with aftermarket, what is the best brand.

 

[420boyboost]

WoooWeee dude!! sorry to say but noobs are funny when they ask questions . your questions can be answered easily through searching but its ok ill give you a little 411. the wastegate is on your turbo assuming your car is stock and is internally gated. once you hit the psi that is set your
WG opens and dumps the excess exhaust gases into the o2 housing/downpipe/exhaust. depending on your setup and the hp you're running theres different bov's that are out there. A nice sounding bov is the greddy type s youtube them to hear what they sound like. This bov cant really handle much power though, i wouldnt go past a 16G turbo with this bov but ppl out there have pushed it more than that im sure. If you're eventually planning on higher hp like 500 then id go with a HKS SSQV they hold boost great and sound dam decent as well. the reason why you cant vent you're bov into the atmosphere for more sound is because the maf which is on your intake for the turbo is meant to read the air that is dumped from the bov hence the reason for the "dump tube" yes u can vent it if you want but you're going to encounter some problems. not MAJOR problems but annoying ones. the solution to this is getting a MAF translator and eventually a GM maf setup. search up thedsmgraveyard.com or dejonpowerhouse.com to see these parts and how much they cost and how they work. Any other "simple" questions can be found through searching. Thats what the search button is for dont be afraid to use it. Learn as much as you can on your own and if you hit a wall then post ?s but other than that enjoy your DSM dont beat the **** out of it and GL with everything

 

[GsXdSmKingGsX]

WoooWeee dude!! sorry to say but noobs are funny when they ask questions . your questions can be answered easily through searching but its ok ill give you a little 411. the wastegate is on your turbo assuming your car is stock and is internally gated. once you hit the psi that is set your
WG opens and dumps the excess exhaust gases into the o2 housing/downpipe/exhaust. depending on your setup and the hp you're running theres different bov's that are out there. A nice sounding bov is the greddy type s youtube them to hear what they sound like. This bov cant really handle much power though, i wouldnt go past a 16G turbo with this bov but ppl out there have pushed it more than that im sure. If you're eventually planning on higher hp like 500 then id go with a HKS SSQV they hold boost great and sound dam decent as well. the reason why you cant vent you're bov into the atmosphere for more sound is because the maf which is on your intake for the turbo is meant to read the air that is dumped from the bov hence the reason for the "dump tube" yes u can vent it if you want but you're going to encounter some problems. not MAJOR problems but annoying ones. the solution to this is getting a MAF translator and eventually a GM maf setup. search up thedsmgraveyard.com or dejonpowerhouse.com to see these parts and how much they cost and how they work. Any other "simple" questions can be found through searching. Thats what the search button is for dont be afraid to use it. Learn as much as you can on your own and if you hit a wall then post ?s but other than that enjoy your DSM dont beat the **** out of it and GL with everything

Last time I checked you sir, are also a n00b.


And to the OP. Go with a 1g crushed for a BOV. They cost like $40 tops and hold ALOT of boost. And you can vent your BOV to the atmosphere if you get some kind of engine management. All you have to do is play with it. But thats a whole nother story.

 

[Dert]

I am new to dsm's, infact i have only had one other turbo'd vehicle and it was a diesel truck, and it had wastegates. I was wondering what the difference is between a bov and a wastegate and which one is better. Also i was told in one of my other threads that having a vented stock bov like i do now is a bad thing. Why is that. And lastly what would be a good bov to go with aftermarket, what is the best brand.

instead of telling him what to buy, why not answer the question and explain the difference between a bov and wastegate? A wastegate is either internal or external, its purpose is to to release any extra exhaust gases from the turbo, the bov's function is to release any boost pressure that is in the piping when the throttle plate is closed. As far as what is better, for wastegates, it depends on your turbo set up. If you are going to make big numbers you are better off going with an external set up, if you are a daily driver and just want to have fun, a smaller turbo ( 14b, 16g etc) will have an internal setup and will fine for the 200-350 hp range, as for bov's its really a personal preference, the 1g is excellent for anybody not wanting to spend $$ on a "name brand" I personally have the greddy type rs, have 2 type s wich I dont like I think they sound like a mouse fart , but I would say a tial is by far the best on the market. Remeber to recuirculate it too, unless you run a blow thru set up like with a 3" gm maft or have ecm link, and remeber to leave boost below 15 psi untill you have the supporting fuel mods to turn it up. Lastly, welcome to the world of dsm's get to know the search button, it is going to become your new best friend...

 

[Achelea]

Also i was told in one of my other threads that having a vented stock bov like i do now is a bad thing.

To actually answer your question though, The reason you need to recirculate your BOV is the you are dumping metered air, and as a result, you will go extremely rich between shifts, and possibly have a difficult time idling.

Let's take a trip through your engine. The air goes through the filter and pass the MAS. IT measures the air and tells the computer how much is coming through. The air goes through the turbo, and the intercooler, and towards the intake manifold, and on through the engine. And since the turbo is moving air, the air pressure begins to build. We call it boost. This is fine during Acceleration, but what happens when you need to shift? You let off the throttle. Now you have a turbo that's still spinning and still pushing air. But since the throttle plate is now closed, it needs to go some where. This is where the BOV (Actually called a Bypass valve) comes into play. Due to the magic of springs, vacuum lines and some clever routing, when you let off the throttle, the BOV opens to allow the pressurized air to escape safely back into the preturbo intake tube. The computer is programmed for this. It's calibrated for X amount of air to be released, and therefore X amount of air to be there when you get back into the throttle.

But when you open to atmosphere, You're losing metered air. So when you get back into it, it has to pull MORE air through the MAS. So the ECU will try to send fuel for the air it measured, PLUS the new air. Meaning it will run Extremely RICH. Which will result in bogging, black smoke, and crappy idle.

The other reason you want to keep the bov recirculated is during idle, the Recirc valve may be partially open. IF it's connected, it's pulling metered air. If it's open, it's pulling in unmetered air, and the car can't send the proper amount of fuel.

That's the reason people will wait til they run a GM Maf Blow through set up. (They put the MAF down stream of the BOV so anything released is unmetered air.) Or the can tune the engine specifically for the lift off situation.

I know it's Long, but it's as close as I can come to an explanation.

 

[420boyboost]

For a "noob" didnt i explain things well? Lol ive been into dsms plenty just never really posted to raise my status. But hey we're here to help the guy out and i think we succeded. Teamwork ppl teamwork! But all in all welcome to DSMs. thread answered. period.

 

[ewyss]

thanks for the help, i actually learned quite a bit from this one thread, thanks for all the info guys!

 

[NYCRedlineTalon]

Good Info even i got something out of this even though i knew the majority of the stuff

 

[Double-X]

well that explains why the idle is off... XD guess i gotta figure a jimmy to recirculate that dump... ...

-The Fallen X