"How-To" SHO and Flex convert to vent to atmosphere with factory blow off valves

[timbo]

Can anyone confirm our BOVS only open upon throttle closure? I was reading some recirculating BOVS will open slightly under vacuum since it is intended to be recirculating.

So there aren't any gains on the dyno? Would VTA help reduce hot air going back into the system? What about decrease in boost, it n would be the same as stock?

I think I mentioned this in another forum.  Was curious about this also.  Are we sure these are BOVs and not BPVs?  Great if so, but if they are BPVs, I don't recommend leaving them completely open.  Throwing some filters on will help.

 

[MiWiAu]

I think I mentioned this in another forum.  Was curious about this also.  Are we sure these are BOVs and not BPVs?  Great if so, but if they are BPVs, I don't recommend leaving them completely open.  Throwing some filters on will help.

I'm sure someone will correct me if I'm off base, but I was under the impression that a BOV and a BPV function in much the same way to relieve pressure on throttle closure under boost. The difference being that a BOV can exit to atmosphere vs a BPV which recirculates the air into the intake. I believe the BPV is important in MAF applications where the air has already been metered, where a BOV would screw up MAF readings (because you are dumping pre-metered air).

In either case, though, I don't think air flow reverses through a BOV or BPV (from the intake to charge pipe) when under vacuum.

Since the EcoBoost uses a MAP sensor to meter air, a BOV to ATM anywhere prior to the intake manifold will not screw up  readings, and I don't believe there are any issues with VTA ingesting unfiltered air, since the direction of flow is always "out" because they're only actuating when under boost, not vacuum.




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[ZSHO]

FWIW ended up using a K&N vent filter a while back which worked quite well in not letting dirt build up accumulate inside the BOV. Z
K&N 62-1370  21.99

https://www.amazon.com/gp/product/B00029WXTA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

 

[8nutz8]

FWIW ended up using a K&N vent filter a while back which worked quite well in not letting dirt build up accumulate inside the BOV. Z
K&N 62-1370  21.99

https://www.amazon.com/gp/product/B00029WXTA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

did it change the sound at all? wouldn't mind something to quiet mine down a bit.


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[ZSHO]

FWIW ended up using a K&N vent filter a while back which worked quite well in not letting dirt build up accumulate inside the BOV. Z
K&N 62-1370  21.99

https://www.amazon.com/gp/product/B00029WXTA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

did it change the sound at all? wouldn't mind something to quiet mine down a bit.


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I don't recall as this was over two years ago and only for a short period of time and went back to stock.
IMO would purchase one and see if you notice any changes in sound. Z

 

[ZSHO]

@Colorado-SHOBro have a couple of the K&N vent Filter's in good condition just collecting dust LMK if you want them. BTW For free of course.  Z 

 

[MiWiAu]

@Colorado-SHOBro have a couple of the K&N Filter in good condition just collecting dust LMK if you want them. BTW For free of course.  Z 

If he doesn't want them, I'll buy them off you. I'm curious more than anything. I wouldn't mind muting mine slightly.

My cabin is pretty quiet, so I'm sure they're pretty loud outside, since I have NO problem hearing them inside with the windows up. Haha

Keep us posted on sound effects, Nutz, if you take Z up on his offer!


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[8nutz8]

honestly i'd probably only want the one as i only have one BOV VTA so more than down to split them with MiWiAu.


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[ZSHO]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

 

[MiWiAu]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

PM sent, thanks!!!

I got another red one on order from Amazon, so I can update on sound changes ASAP!


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[8nutz8]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

this classy gentleman . . since you won't accept any payment i'm wishing you 100 good karma points for your generosity. may they be redeemed when you need them most.


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[MiWiAu]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

this classy gentleman . . since you won't accept any payment i'm wishing you 100 good karma points for your generosity. may they be redeemed when you need them most.


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+1000. If your email ever leaks I'm sending you some bitcoins. In the meantime, please accept an additional 100 karma points!


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[SHOdded]

Aw, you two are so sweet

 

[ZSHO]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

PM sent, thanks!!!

I got another red one on order from Amazon, so I can update on sound changes ASAP!


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FYI ordered mine back on 3/14 and could not specify the color of choice, so one came red and one gray so ended up installing the gray one in the back/rear. Z

 

[MiWiAu]

Colorado-SHOBro & MiWiAu will have the items shipped out tomorrow via usps and got you covered,enjoy the filters and keep us updated.  Z

PM sent, thanks!!!

I got another red one on order from Amazon, so I can update on sound changes ASAP!


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FYI ordered mine back on 3/14 and could not specify the color of choice, so one came red and one gray so ended up installing the gray one in the back. Z

No worries. I'll use whatever shoes up.


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[ZSHO]

FWIW ended up using a K&N vent filter a while back which worked quite well in not letting dirt build up accumulate inside the BOV. Z
K&N 62-1370  21.99

https://www.amazon.com/gp/product/B00029WXTA/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

did it change the sound at all? wouldn't mind something to quiet mine down a bit.


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AFAIK only having the one BOV VTA contributes to more pressure directed/aimed towards the front of the vehicle which explains why its louder IMO.just my 2 cent.  Z

 

[ZSHO]

@MiWiAu. BTW didn't charge you extra for the BMW clamp.LMAO. Enjoy my friend and its always my pleasure to help out. Z

 

[MiWiAu]

@MiWiAu. BTW didn't charge you extra for the BMW clamp.LMAO. Enjoy my friend andits always my pleasure.  Z

LOL, thanks, Z!!


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[ZSHO]

Lets get back on Topic and enough of the Mr Nice guy and need to remind the Newb's to setup an intro and all,etc.lol. Z 

 

[SHOdded]

Discussion on using the breather filters with the BOV mod is continued here:
http://www.ecoboostperformanceforum.com/index.php/topic,7486

and renamed to
"How-To" Using Breather Filters with BOV VTA Mod