ESS BPV vent to atmosphere

Bashar368 · 04-19-2015, 02:24 PM

Quote:

Originally Posted by webninja

I believe there is a big difference with the open bpv on a manual vs DCT. The DCT would have more of a constant air leak sound.

This is true. I am a 6 speed which could be why it isn't annoying

Sered · 04-20-2015, 03:43 PM

Sounds like a bpv spring is too tight. That fluttering sound is mild compressor flutter (sometimes incorrectly called compressor surge).

jdamore · 05-17-2015, 09:59 AM

Bumping this thread.

By recirculating (hot) air, doesn't that increase air temps or is this "recirculated" heat load diminished by the intercooler anyway?

Patrón · 05-17-2015, 11:46 AM

Quote:

Originally Posted by jdamore

Bumping this thread.

By recirculating (hot) air, doesn't that increase air temps or is this "recirculated" heat load diminished by the intercooler anyway?

That is something I though as well. I'd rather have fresh air from the intake vs some air that has gone through metal manifold? Big difference I don't know.

s85e90 · 05-17-2015, 02:24 PM

Quote:

Originally Posted by jdamore

Bumping this thread.

By recirculating (hot) air, doesn't that increase air temps or is this "recirculated" heat load diminished by the intercooler anyway?

Only maf based cars require recirculating setups due to having the metered air accounted for. The point of recirculating is to also keep the impeller spinning as when you left off the throttle to shift the throttle plate closes and if there was no bov the air would be forced back against the compressor wheel and cause damage over time. By venting, you release the air to the atmosphere. By recirculating you are dumping the air back into the intake tract that then helps to keep the compressor wheel spinning off throttle.

Will2 · 05-19-2015, 12:31 AM

So after trying this out, I come to the conclusion that it is not to my liking. The "whoosh" sound that comes immediately after letting off the throttle is much louder as compared to when the BPV is recirculated and that much I like. However, as others have said, there is a constant "whistle" sound when off the throttle (for DCT at least) which is super annoying.

I wonder if the BPV tension spring can be adjusted to minimize the constant "whistle" when off throttle? Mine was set at basically fully loose and I didn't want to adjust it too much without understanding if its safe to do so or not.

sales@ESSTuning · 05-19-2015, 09:55 AM

Quote:

Originally Posted by Will2

So after trying this out, I come to the conclusion that it is not to my liking. The "whoosh" sound that comes immediately after letting off the throttle is much louder as compared to when the BPV is recirculated and that much I like. However, as others have said, there is a constant "whistle" sound when off the throttle (for DCT at least) which is super annoying.

I wonder if the BPV tension spring can be adjusted to minimize the constant "whistle" when off throttle? Mine was set at basically fully loose and I didn't want to adjust it too much without understanding if its safe to do so or not.

Making small adjustments are ok when needed but trying to change sound by adjusting the tension adjustment on the bypass is not recommended. Superchargers that run open to atmosphere have a sound that will not change much simply due to design. During off throttle any unused air will be vented creating that constant whistle.

spr · 02-06-2017, 06:42 PM

How were you loosing boost??? It just shuts and you have boost. If you were losing boost the BOV was broken and leaking. It doesn't matter if it is vented to atmosphere or going back into the blower intake.

Quote:

Originally Posted by Patrón

My car sounded like that when my bpv wasn't connected correctly, it would make that fluttering noise under load, I was losing boost. Connected correctly and the noise went away.

Patrón · 02-07-2017, 07:41 AM

Quote:

Originally Posted by spr

How were you loosing boost??? It just shuts and you have boost. If you were losing boost the BOV was broken and leaking. It doesn't matter if it is vented to atmosphere or going back into the blower intake.

My vacuum hose was not connected correctly underneath the manifold. The hose needs vacuum to close that valve, that is what that fluttering noise was.

spr · 02-07-2017, 01:12 PM

Did you have full boost registering at the bov line or was it definitely low boost at the bov?

Quote:

Originally Posted by Patrón

My vacuum hose was not connected correctly underneath the manifold. The hose needs vacuum to close that valve, that is what that fluttering noise was.

Patrón · 02-07-2017, 11:09 PM

Quote:

Originally Posted by spr

Did you have full boost registering at the bov line or was it definitely low boost at the bov?

I was unable to read boost because my gauge was not setup but my butt dyno detected a lot more power when I connected the line. The fluttering sound went away.

spr · 02-07-2017, 11:44 PM

Interesting. I'm having the same problem but strangely I can get full boost readings at the line to the bov.

Quote:

Originally Posted by Patrón

I was unable to read boost because my gauge was not setup but my butt dyno detected a lot more power when I connected the line. The fluttering sound went away.

JsL · 02-08-2017, 01:24 AM

Why does the dct have a constant whistle when the bov vents to atmosphere vs 6mt?

Is it because the computer modulates the throttle to make dct driving smoother vs driver controlled throttle in 6mt?

Patrón · 02-08-2017, 10:58 AM

Quote:

Originally Posted by spr

Interesting. I'm having the same problem but strangely I can get full boost readings at the line to the bov.

i'm not 100% certain but it could be the bolt & screw adjustments on the Bypass valve BUT since you are getting full boost, i wouldn't mess with anything. the sound is just the bpv doing it's job.

On a similar note. I too disconnected the bypass valve connection to the intake as well as the other vent tube (manifold hoses) to the intake. I believe that it's recirculating hot air back into the intake/blower. I used 1in and 1& 1/4in plumbing end caps (rubber caps with metal clamps) to block off the intake holes. I'm trying to do anything to reduce my intake temps.

Matheus · 02-08-2017, 11:29 AM

Ive been using my BPV vented to air in my DCT M3, and I can say that in the first weeks it was awesome...
But now, I just sounds like shi....
Sounds like the car has asma, something like that.
Tested it on dyno and it does not change anything, same power, same boost, only a annoying sound when u let the throttle off.
The BPV should recirculate cold air, not hot air. I don't know if it's correct, but the air that came off the manifold already passed into the cooling system inside thr manifold right?
DCT has this constant whistle because as you know, supercharger is moved by the engine crank, so the only way to make rpm lower is to put it in neutral. when you have a 6MT you can just press the clutch.
But believe me, in a highway, this whistle will just make you go nuts!

Patrón · 02-08-2017, 02:53 PM

Quote:

Originally Posted by Matheus

The BPV should recirculate cold air, not hot air. I don't know if it's correct, but the air that came off the manifold already passed into the cooling system inside thr manifold right?

I believe so.

But if AIT are 20-30 deg hotter than ambient, the intake air should be cooler or at the very least close to ambient.

MShift · 02-08-2017, 03:10 PM

I'm not familiar with how the ESS kit does airflow metering, but be careful; you don't want to be venting metered air as it will throw the tune off, make you run rich and lose power. Also, that echoing flutter can be surge from the bpv not opening at all..in which case its a bad thing.

Matheus · 02-08-2017, 06:20 PM

Quote:

Originally Posted by MShift

I'm not familiar with how the ESS kit does airflow metering, but be careful; you don't want to be venting metered air as it will throw the tune off, make you run rich and lose power. Also, that echoing flutter can be surge from the bpv not opening at all..in which case its a bad thing.

Well, I don't think it makes any difference. Please correct me if I'm wrong, but the hose connects just behind the blower, só should not be any difference in air flow inside the system.
I just gave a shot on this because VF told me that does does not make any difference at all, only that constant whistle.

MShift · 02-09-2017, 10:44 AM

Quote:

Originally Posted by Matheus

Well, I don't think it makes any difference. Please correct me if I'm wrong, but the hose connects just behind the blower, só should not be any difference in air flow inside the system.
I just gave a shot on this because VF told me that does does not make any difference at all, only that constant whistle.

If VF told you it doesn't matter then it shouldn't matter. Like I said, I'm not familiar with the system, but this was a concern on my last car which was supercharged. With regards to the constant whistle: there should be no air coming out of the BPV at any time other than when it sees vaccuum and vents. Is it just the whistle from the actual unit being more audible since you removed the hose?

Patrón · 02-09-2017, 12:13 PM

Quote:

Originally Posted by MShift

If VF told you it doesn't matter then it shouldn't matter. Like I said, I'm not familiar with the system, but this was a concern on my last car which was supercharged. With regards to the constant whistle: there should be no air coming out of the BPV at any time other than when it sees vaccuum and vents. Is it just the whistle from the actual unit being more audible since you removed the hose?

at idle, the blower is still forcing air so the bypass valve does have air blowing out (technically back into the intake). just not whistling.

MShift · 02-09-2017, 12:29 PM

Quote:

Originally Posted by Patrón

at idle, the blower is still forcing air so the bypass valve does have air blowing out (technically back into the intake). just not whistling.

Maybe I misunderstood and you may be right. I had interpreted "constant whistle" as always whistling throughout the RPM range, not sitting at idle.

Matheus · 02-09-2017, 12:52 PM

Quote:

Originally Posted by MShift

Maybe I misunderstood and you may be right. I had interpreted "constant whistle" as always whistling throught the RPM range, not sitting at idle.

The whistle only come out when you left the throttle.
Specially if you are in higher RPM. At idle the BPV is venting air, but you Just can't hear, cause it's not so much air.
Above 2k RPM you can hear the whistle, but only if you left the throttle off.
With WOT there is not any whistle, cause the BPV is closed to create pressure inside the system.

04-20-2015, 03:43 PM	#24
Sered Major 154 Rep 1,201 Posts Drives: 08 E90 335i Join Date: Apr 2012 Location: Melbourne, FL iTrader: (3)	Sounds like a bpv spring is too tight. That fluttering sound is mild compressor flutter (sometimes incorrectly called compressor surge). __________________ '08 E90 w/ just boltons '09 Z4 sDrive35i w/ just boltons
	Appreciate 0 Quote

05-17-2015, 09:59 AM	#25
jdamore Captain 451 Rep 864 Posts Drives: 2008 e92 M3 Join Date: May 2013 Location: New Jersey iTrader: (4)	Bumping this thread. By recirculating (hot) air, doesn't that increase air temps or is this "recirculated" heat load diminished by the intercooler anyway? __________________ -- 08 JB e92 6MT ///M3 ESS VT2-625 --
	Appreciate 1 R_lara83.00 Quote

05-19-2015, 12:31 AM	#28
Will2 New Member 7 Rep 14 Posts Drives: E90 M3 DCT Join Date: Dec 2013 Location: S. CA iTrader: (0)	So after trying this out, I come to the conclusion that it is not to my liking. The "whoosh" sound that comes immediately after letting off the throttle is much louder as compared to when the BPV is recirculated and that much I like. However, as others have said, there is a constant "whistle" sound when off the throttle (for DCT at least) which is super annoying. I wonder if the BPV tension spring can be adjusted to minimize the constant "whistle" when off throttle? Mine was set at basically fully loose and I didn't want to adjust it too much without understanding if its safe to do so or not.
	Appreciate 0 Quote

02-08-2017, 01:24 AM	#35
JsL Major 459 Rep 1,266 Posts Drives: 2011 AW M3 ZCP Join Date: Dec 2013 Location: SF Bay Area iTrader: (2)	Why does the dct have a constant whistle when the bov vents to atmosphere vs 6mt? Is it because the computer modulates the throttle to make dct driving smoother vs driver controlled throttle in 6mt?
	Appreciate 0 Quote

02-08-2017, 11:29 AM	#37
Matheus Private 27 Rep 55 Posts Drives: 2012 M3 E92 Fire Orange Join Date: Mar 2015 Location: Brazil iTrader: (0)	Ive been using my BPV vented to air in my DCT M3, and I can say that in the first weeks it was awesome... But now, I just sounds like shi.... Sounds like the car has asma, something like that. Tested it on dyno and it does not change anything, same power, same boost, only a annoying sound when u let the throttle off. The BPV should recirculate cold air, not hot air. I don't know if it's correct, but the air that came off the manifold already passed into the cooling system inside thr manifold right? DCT has this constant whistle because as you know, supercharger is moved by the engine crank, so the only way to make rpm lower is to put it in neutral. when you have a 6MT you can just press the clutch. But believe me, in a highway, this whistle will just make you go nuts!
	Appreciate 0 Quote

02-08-2017, 03:10 PM	#39
MShift OG 237 Rep 714 Posts Drives: MW '13 E92 Join Date: Mar 2008 Location: Miami iTrader: (3)	I'm not familiar with how the ESS kit does airflow metering, but be careful; you don't want to be venting metered air as it will throw the tune off, make you run rich and lose power. Also, that echoing flutter can be surge from the bpv not opening at all..in which case its a bad thing.
	Appreciate 0 Quote