Bov On N55 !

LoneWolfPistol · 08-03-2018, 05:51 AM

I already know that there is a DV on the turbo itself. But I bought this charge pipe without knowing. So the question is if I install this without getting the bov flange welded shut and I attach the bov. Will it hurt/harm the engine or will it pretty much make a little cool sound and do nothing beneficial mechanically?

lwgrenier · 08-03-2018, 06:43 AM

Are you sure the pipe fits your car? I'd imagine this would affect the performance. Also I'm not sure what vacuum line you'd connect.

LoneWolfPistol · 08-03-2018, 07:05 AM

Honestly I test fitted it and it fits perfectly with the clamps and all. Took it down the street for a drive a bov works fine no problem. Please educate me on the vacuum line, also if this could cause any major problems for me should I get the bov welded shut or keep it. To me its like a secondary pressure release since the turbo already have a DV.

lwgrenier · 08-03-2018, 07:41 AM

I don't know that much about BOVs but I'd guess if you don't have a vacuum line connected then the BOV will never open and "blow off" when the throttle closes. It's essentially acting like a normal charge pipe. I guess you might actually be fine if you don't have a vacuum line going to the BOV because you still have the DV.

LoneWolfPistol · 08-03-2018, 08:44 AM

Quote:

Originally Posted by lwgrenier

I don't know that much about BOVs but I'd guess if you don't have a vacuum line connected then the BOV will never open and "blow off" when the throttle closes. It's essentially acting like a normal charge pipe. I guess you might actually be fine if you don't have a vacuum line going to the BOV because you still have the DV.

Right it only opens up when i'm actually in the gas, when I let off it closes. But it does give off quite the sound once fully opened

lwgrenier · 08-03-2018, 09:52 AM

That doesn't sound right. A blow off valve should be closed when accelerating. Once you get off the gas and the throttle closes the BOV will open to release the built up pressure in the charge pipe.

https://en.wikipedia.org/wiki/Blowoff_valve

LoneWolfPistol · 08-03-2018, 10:26 AM

Quote:

Originally Posted by lwgrenier

That doesn't sound right. A blow off valve should be closed when accelerating. Once you get off the gas and the throttle closes the BOV will open to release the built up pressure in the charge pipe.

https://en.wikipedia.org/wiki/Blowoff_valve

I wonder what it is that I am hearing. I would say compressor surge but I don't know. I do know I only hear it when im over the desired pressure for it to open/Increasing in speed.

Maybe while the throttle is open the piston must be compressed by that pressure. So I must be just blowing air out of the bov while accelerating and once the throttle is closed the bov is shut?

lwgrenier · 08-03-2018, 10:39 AM

Could be a boost leak, but unlikely you'd hear it without throwing a code. Our turbos are also fairly audible.

SnapCoupe · 08-03-2018, 10:41 AM

Quote:

Originally Posted by Simplev33

I wonder what it is that I am hearing. I would say compressor surge but I don't know. I do know I only hear it when im over the desired pressure for it to open/Increasing in speed.

Maybe while the throttle is open the piston must be compressed by that pressure. So I must be just blowing air out of the bov while accelerating and once the throttle is closed the bov is shut?

The vacuum line is what should be actuating the BOV. Without any vacuum attached, the valve is allowed to freely move by the boost going through the CP. It sounds to me that when you're on throttle, the boost pressure in the charge pipe is escaping through the valve, which is the opposite of what you want to happen. Blow off valves should only vent boost pressure when off throttle as to avoid compressor surge. All it's doing now is creating a boost leak and probably making your car run poorly.

9krpmrx8 · 08-03-2018, 10:43 AM

Just get the right fucking charge pipe.

LoneWolfPistol · 08-03-2018, 10:47 AM

Quote:

Originally Posted by 9krpmrx8

Just get the right fucking charge pipe.

Ditto , Just thought this one was better. thanks guy

LoneWolfPistol · 08-03-2018, 10:49 AM

Quote:

Originally Posted by SnapCoupe

The vacuum line is what should be actuating the BOV. Without any vacuum attached, the valve is allowed to freely move by the boost going through the CP. It sounds to me that when you're on throttle, the boost pressure in the charge pipe is escaping through the valve, which is the opposite of what you want to happen. Blow off valves should only vent boost pressure when off throttle as to avoid compressor surge. All it's doing now is creating a boost leak and probably making your car run poorly.

Havent had any performance issues as of yet. But Im ordering a different CP now. If anything as a temporary fix I can put in a heavier psi spring to keep it held down.

Kevin39 · 08-03-2018, 02:34 PM

Quote:

Originally Posted by Simplev33

Havent had any performance issues as of yet.

I bet you have and you haven't noticed. I'm sure if you logged at all, you'd see it wasn't right. You're dumping air out of the system after the MAF sensor.

Speedy_12139 · 08-05-2018, 05:12 PM

Quote:

Originally Posted by 9krpmrx8

Just get the right fucking charge pipe.

X3

08-03-2018, 05:51 AM	#1
LoneWolfPistol Private First Class 9 Rep 163 Posts Drives: Decent Join Date: Jul 2018 Location: NY iTrader: (0)	Bov On N55 ! I already know that there is a DV on the turbo itself. But I bought this charge pipe without knowing. So the question is if I install this without getting the bov flange welded shut and I attach the bov. Will it hurt/harm the engine or will it pretty much make a little cool sound and do nothing beneficial mechanically?
	Appreciate 0 Tweet Quote

08-03-2018, 06:43 AM	#2
lwgrenier First Lieutenant 117 Rep 255 Posts Drives: 2011 e92 335i XDrive Join Date: Oct 2017 Location: New Hampshire iTrader: (0)	Are you sure the pipe fits your car? I'd imagine this would affect the performance. Also I'm not sure what vacuum line you'd connect.
	Appreciate 0 Quote

08-03-2018, 07:05 AM	#3
LoneWolfPistol Private First Class 9 Rep 163 Posts Drives: Decent Join Date: Jul 2018 Location: NY iTrader: (0)	Honestly I test fitted it and it fits perfectly with the clamps and all. Took it down the street for a drive a bov works fine no problem. Please educate me on the vacuum line, also if this could cause any major problems for me should I get the bov welded shut or keep it. To me its like a secondary pressure release since the turbo already have a DV.
	Appreciate 0 Quote

08-03-2018, 07:41 AM	#4
lwgrenier First Lieutenant 117 Rep 255 Posts Drives: 2011 e92 335i XDrive Join Date: Oct 2017 Location: New Hampshire iTrader: (0)	I don't know that much about BOVs but I'd guess if you don't have a vacuum line connected then the BOV will never open and "blow off" when the throttle closes. It's essentially acting like a normal charge pipe. I guess you might actually be fine if you don't have a vacuum line going to the BOV because you still have the DV.
	Appreciate 0 Quote

08-03-2018, 09:52 AM	#6
lwgrenier First Lieutenant 117 Rep 255 Posts Drives: 2011 e92 335i XDrive Join Date: Oct 2017 Location: New Hampshire iTrader: (0)	That doesn't sound right. A blow off valve should be closed when accelerating. Once you get off the gas and the throttle closes the BOV will open to release the built up pressure in the charge pipe. https://en.wikipedia.org/wiki/Blowoff_valve
	Appreciate 0 Quote

08-03-2018, 10:39 AM	#8
lwgrenier First Lieutenant 117 Rep 255 Posts Drives: 2011 e92 335i XDrive Join Date: Oct 2017 Location: New Hampshire iTrader: (0)	Could be a boost leak, but unlikely you'd hear it without throwing a code. Our turbos are also fairly audible.
	Appreciate 0 Quote

08-03-2018, 10:43 AM	#10
9krpmrx8 Clean is the new cool, keep it that way. 808 Rep 1,685 Posts Drives: 11' Alpine White 335i Sedan Join Date: Jan 2016 Location: San Antonio, Texas iTrader: (0)	Just get the right fucking charge pipe. __________________ 2011 335i, FBO, N55+ Turbo, full E85, S55 intercooler, etc. 2015 X5 35i Xdrive
	Appreciate 0 Quote