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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 12-29-2013, 09:55 PM
jamesching jamesching is offline
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pros and cons of bov

pros and cons i want knowledgable answers now just people that like bovs and people that dont giving me their side of the story. pros and cons. thanks. blow off valve were talkin
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  #2  
Old 12-30-2013, 06:02 AM
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CALWATERBOY CALWATERBOY is offline
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pros and cons i want knowledgable answers now just people that like bovs and people that dont giving me their side of the story. pros and cons. thanks. blow off valve were talkin

Here's all you need to know: If turbos unmodified, stock BOV does job silently. Aftermarket does same job not silently, noticed by those nearby, CHiPs or no.
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Old 12-30-2013, 08:56 AM
jamesching jamesching is offline
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bad

This is a nad answer considering u said "this is all u need to know" I didnt ask what I need to know i asked all pros and cons doesnt look like u gave me much bout intakes nd bovs
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Old 12-30-2013, 10:22 AM
fdriller9 fdriller9 is online now
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I think it really only boils down to preference.

The stock diverter valves are in place for noise and emissions reasons. It does not make noise, it just recirculates unused air back into the intake stream to be reused, reducing emissions.

BOVs will make noise, obviously, because they don't recirculate unused air back into the intake stream, they blow it off to atmosphere.

They make hybrid, BOV/diverter valves that do sort of both.
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Old 12-30-2013, 10:47 AM
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This is a nad answer considering u said "this is all u need to know" I didnt ask what I need to know i asked all pros and cons doesnt look like u gave me much bout intakes nd bovs
Which part are you missing? If you want to make noise get a BOV if not leave it stock.
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  #6  
Old 12-30-2013, 11:24 AM
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CALWATERBOY CALWATERBOY is offline
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This is a nad answer considering u said "this is all u need to know" I didnt ask what I need to know i asked all pros and cons doesnt look like u gave me much bout intakes nd bovs

Well jamesching, those are the pros and cons. Like I said: Unmodded turbos. It's a simple pressure relief. There ya go - Google that!
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Old 12-30-2013, 12:37 PM
jamesching jamesching is offline
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What r some ways it can harm or hell the engine also I. can pass emissions with in right in jersey
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Old 12-30-2013, 12:49 PM
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CALWATERBOY CALWATERBOY is offline
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What r some ways it can harm or hell the engine also I. can pass emissions with in right in jersey

Good Lord. It can't harm your engine. In a basic way same as stock but open to atmosphere.
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Old 12-30-2013, 01:21 PM
jamesching jamesching is offline
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Then why do people with 335i say that it has...u needa calm down cal
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Old 12-30-2013, 01:22 PM
fdriller9 fdriller9 is online now
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You should search google and various forums. These questions have been answered before.
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Old 12-30-2013, 02:56 PM
bseebeck bseebeck is offline
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Good Lord. It can't harm your engine. In a basic way same as stock but open to atmosphere.
I don't know how you answered that Cal. I could barely understand what he was trying to say. Does this forum not have a spell check feature?
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Old 12-30-2013, 06:54 PM
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I don't know how you answered that Cal. I could barely understand what he was trying to say. Does this forum not have a spell check feature?

Well, I'm fluent in Text Language.
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Old 12-30-2013, 07:42 PM
ptrcd003 ptrcd003 is offline
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Our new members seem to be getting ruder and less capable of communicating. May be time for an F30.
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Old 12-31-2013, 06:47 AM
roadkillrob roadkillrob is offline
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Technically the stock diverters are a bit weak and of course just made out of plastic like half the car. Stock no real difference except noise, if you are making more boost, at some point the stock diverters can leak boost of fail and then you need a stronger part. As for noise, most BOV's just vent atmosphere, so you get the little pressure release sound - they all make different sounds, some are loud some are not so much. You can also get BOV's that will work like the stock diverters and vent back into the intake and make more noise.
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Old 12-31-2013, 11:09 AM
isjoey isjoey is offline
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Pros - Will be able to handle higher boost better than the stock BOV and noise. Will not effect emissions at all.

Cons Get a recirculating bov if you do get one - 1) If you get an atmospheric bov for just noise your drivability will go to ****! Your turbos basically need to rebuild most or all of the boost pressure when you even slightly let off the gas. 2) Use more gas
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Old 12-31-2013, 02:52 PM
Pilgrim Pilgrim is offline
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Well, I'm fluent in Text Language.
And patient to a fault. My respects go out to you for your tolerance.
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Old 12-31-2013, 05:54 PM
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Our new members seem to be getting ruder and less capable of communicating. May be time for an F30.

The E9X has pretty much hit its expiration date. Nothing much new to say in quite a while.
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Old 01-02-2014, 08:17 AM
RobertoCervezas RobertoCervezas is offline
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pros and cons i want knowledgable answers now just people that like bovs and people that dont giving me their side of the story. pros and cons. thanks. blow off valve were talkin
A bov will cost money and won't make your car any faster. Draws attention from all the wrong people. Doesn't sound like a good investment to me.
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Old 01-02-2014, 12:13 PM
hondo402000 hondo402000 is offline
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I thought they were called Waste Gates, any excess pressure over the rated PSI on boost pressure, the waste gate would open to relieve the excess pressure, but still allow the proper PSI to still go to the intake

I think of a blow off Valve associated with pressure vessels, Like a steam boiler, Exceed the MAWP(thats maxium allowable working pressure the the valve would Pop open and let off the pressure so the unit would not blow up, and some would have to be manually reset
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Old 01-02-2014, 12:21 PM
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Orient330iNYC Orient330iNYC is offline
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Originally Posted by hondo402000 View Post
I thought they were called Waste Gates, any excess pressure over the rated PSI on boost pressure, the waste gate would open to relieve the excess pressure, but still allow the proper PSI to still go to the intake

I think of a blow off Valve associated with pressure vessels, Like a steam boiler, Exceed the MAWP(thats maxium allowable working pressure the the valve would Pop open and let off the pressure so the unit would not blow up, and some would have to be manually reset
waste gates operate on the exhaust side of the turbo, bleeding off exhaust gases when boost isnt requested. for example, when running at low load or if the boost target has already been hit.

bypass or blow off valves operate on the intake tract, they bleed off excess boost pressure post turbo. for example, if you lift off the throttle, to shift for example, the built up boost in the intake tract has to be released. hence the blow off or bypass valve.
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