Synapse BOV just went really quiet this weekend, What to check?

Starscream · 02-16-2015, 02:12 AM

It still releases a little "whoosh" but nothing like it used to,

Its absolutely freezing outside so I need to get it on and off the car asap,

Anyone have an idea what could be up with it?
Car drives smooth no stutters,
Buts slower I feel than it should be under boost,
I checked the obvious, /Vacuum lines or if anything had come off,

and heres a weird question, at idle, if you feel directly in front of the bov
Should I feel air coming out of that? Or it that normal?

mike@x-ph.com · 02-16-2015, 08:29 PM

You shouldnt feel air coming out of the BOV on idle
Synapse have not been a reliable BOV for our cars which made lots of Manufacturers stop offering them with their charge pipes.
I recommend calling synapse,if they cant help you get another BOV ( HKS or Tial)

blaster3500 · 02-16-2015, 09:43 PM

Check out this vid. They had a problem with a small spring breaking

Starscream · 02-17-2015, 12:17 AM

I got of off the car tonight,

Stripped it and cleaned it, No broken parts so nothing obvious,
and yes at idle its still letting air out,

But the cars seems to be running ok? Weird

E92cpe · 02-17-2015, 01:34 PM

I'm gonna follow this as I have the Synapse as well. I can tell you for sure that air comes out of mine at idle. After I put it on I was freaking out about this so I did some research and found that this is absolutely normal for air to come out at idle. Check out the video.

Starscream · 02-19-2015, 06:59 PM

Yup wasn't the little spring inside the valve or the larger spring,
No broken parts I can see,
Can't find a vacuum or boost leak, Anyone else have any idea's why it went quiet on me?

Sgop335 · 02-19-2015, 07:42 PM

Quote:

Originally Posted by E92cpe

I'm gonna follow this as I have the Synapse as well. I can tell you for sure that air comes out of mine at idle. After I put it on I was freaking out about this so I did some research and found that this is absolutely normal for air to come out at idle. Check out the video.

Funny how the video says, blows air out under load on the freeway. That would be a boost leak.

E92cpe · 02-21-2015, 09:47 PM

Quote:

Originally Posted by Starscream

Yup wasn't the little spring inside the valve or the larger spring,
No broken parts I can see,
Can't find a vacuum or boost leak, Anyone else have any idea's why it went quiet on me?

Follow up?

Starscream · 02-21-2015, 10:00 PM

Still a lot quieter than before with no explanation.

I even tried emailing synapse, They responded with "check the small spring and if its broken take it out"

they never replied to any of my follow up emails saying its still quiet so I'm at a loss

E92cpe · 02-21-2015, 10:06 PM

Wow that's crazy. I was out driving the car today and it's just as loud as it was new. Iv'e only had it on about 3 months now. How long has it been since the install?

Starscream · 02-21-2015, 10:20 PM

I bought it used so I'm not sure how many total miles on it,

But there doesn't seem to be many parts inside it so it must be something I've missed or overlooked

All seals and O-Rings are fine, no broken springs,
Really has me scratching my head

02-21-2015, 10:31 PM

You have a boost leak. My guess is one of your intercooler pipes, or charge pipe, etc. came loose or popped off altogether.

Yes, you can have a massive boost leak and still not throw a CEL...ask me how I know.

dbworld4k · 02-21-2015, 11:07 PM

Did you check your coupler to your throttle body? Mine popped off again -_-

robc1976 · 02-22-2015, 09:50 AM

Check the vac lines

Starscream · 02-23-2015, 09:20 AM

Embarrassingly enough I believe this was a boost leak,
I took off the chargepipe and cleaned all fittings, Put a new throttle body O-Ring on and reseated the synapse valve to the CP,

Seems like its got its sound back, I'm awaiting a boost gauge from ECS so I'll know what kind of numbers I'm making rather than the gauge hijack from the JB4 but I'm pretty sure I found it even though there was nothing obvious when removing the chargepipe,

I guess just re-seating it all back together helped?

Jeff@TopGearSolutions · 02-23-2015, 10:33 AM

Quote:

Originally Posted by Starscream

Embarrassingly enough I believe this was a boost leak,
I took off the chargepipe and cleaned all fittings, Put a new throttle body O-Ring on and reseated the synapse valve to the CP,

Seems like its got its sound back, I'm awaiting a boost gauge from ECS so I'll know what kind of numbers I'm making rather than the gauge hijack from the JB4 but I'm pretty sure I found it even though there was nothing obvious when removing the chargepipe,

I guess just re-seating it all back together helped?

Stock charge pipe?

E92cpe · 02-23-2015, 02:04 PM

That's awesome Starscream. Glad you figured it out!

Sgop335 · 02-23-2015, 05:51 PM

Quote:

Originally Posted by Jeff@TopGearSolutions

Stock charge pipe?

Its a bov. Must be an aftermarket cp.

blaster3500 · 02-24-2015, 10:19 AM

Get a USB cable for the jb4. Logs will help much more than a boost gauge. You can see if you are hitting target.

Jeff@TopGearSolutions · 02-24-2015, 10:29 AM

Quote:

Originally Posted by Sgop335

Its a bov. Must be an aftermarket cp.

I agree. So I'm thinking whatever charge pipe he had was simply not seated well and or not tightened enough. That is likely why it works better now.

Starscream · 02-24-2015, 10:42 AM

Quote:

Originally Posted by blaster3500

Get a USB cable for the jb4. Logs will help much more than a boost gauge. You can see if you are hitting target.

my JB4 does have the USB option but I've never logged anything,

without sounding stupid what do I need to do?

blaster3500 · 02-24-2015, 11:34 AM

Quote:

Originally Posted by Starscream

my JB4 does have the USB option but I've never logged anything,

without sounding stupid what do I need to do?

These two links should help. You can always email terry for feedback on a log. It is pretty straight forward but if you have any questions just ask.

http://www.n54tech.com/forums/showthread.php?t=13465

http://www.n54tech.com/forums/showthread.php?t=10605

02-16-2015, 02:12 AM	#1
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	Synapse BOV just went really quiet this weekend, What to check? It still releases a little "whoosh" but nothing like it used to, Its absolutely freezing outside so I need to get it on and off the car asap, Anyone have an idea what could be up with it? Car drives smooth no stutters, Buts slower I feel than it should be under boost, I checked the obvious, /Vacuum lines or if anything had come off, and heres a weird question, at idle, if you feel directly in front of the bov Should I feel air coming out of that? Or it that normal? __________________ Imola Red Roadster
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02-16-2015, 08:29 PM	#2
mike@x-ph.com BimmerPost Supporting Vendor 24198 Rep 190,805 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	You shouldnt feel air coming out of the BOV on idle Synapse have not been a reliable BOV for our cars which made lots of Manufacturers stop offering them with their charge pipes. I recommend calling synapse,if they cant help you get another BOV ( HKS or Tial) __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
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02-16-2015, 09:43 PM	#3
blaster3500 Lieutenant 143 Rep 567 Posts Drives: 07 E90 335i Join Date: Aug 2010 Location: Seneca, SC iTrader: (7)	Check out this vid. They had a problem with a small spring breaking __________________ 07 335 6MT
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02-17-2015, 12:17 AM	#4
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	I got of off the car tonight, Stripped it and cleaned it, No broken parts so nothing obvious, and yes at idle its still letting air out, But the cars seems to be running ok? Weird __________________ Imola Red Roadster
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02-17-2015, 01:34 PM	#5
E92cpe Private First Class 8 Rep 116 Posts Drives: E92 coupe auto sport package Join Date: Sep 2014 Location: Newport News, Va iTrader: (1)	I'm gonna follow this as I have the Synapse as well. I can tell you for sure that air comes out of mine at idle. After I put it on I was freaking out about this so I did some research and found that this is absolutely normal for air to come out at idle. Check out the video.
	Appreciate 0 Quote

02-19-2015, 06:59 PM	#6
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	Yup wasn't the little spring inside the valve or the larger spring, No broken parts I can see, Can't find a vacuum or boost leak, Anyone else have any idea's why it went quiet on me? __________________ Imola Red Roadster
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02-21-2015, 10:00 PM	#9
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	Still a lot quieter than before with no explanation. I even tried emailing synapse, They responded with "check the small spring and if its broken take it out" they never replied to any of my follow up emails saying its still quiet so I'm at a loss __________________ Imola Red Roadster
	Appreciate 0 Quote

02-21-2015, 10:06 PM	#10
E92cpe Private First Class 8 Rep 116 Posts Drives: E92 coupe auto sport package Join Date: Sep 2014 Location: Newport News, Va iTrader: (1)	Wow that's crazy. I was out driving the car today and it's just as loud as it was new. Iv'e only had it on about 3 months now. How long has it been since the install?
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02-21-2015, 10:20 PM	#11
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	I bought it used so I'm not sure how many total miles on it, But there doesn't seem to be many parts inside it so it must be something I've missed or overlooked All seals and O-Rings are fine, no broken springs, Really has me scratching my head __________________ Imola Red Roadster
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02-21-2015, 10:31 PM	#12
FCobra94 Guest 0 Rep n/a Posts Drives:	You have a boost leak. My guess is one of your intercooler pipes, or charge pipe, etc. came loose or popped off altogether. Yes, you can have a massive boost leak and still not throw a CEL...ask me how I know.
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02-21-2015, 11:07 PM	#13
dbworld4k Banned 583 Rep 2,233 Posts Drives: '12 M3 Join Date: Mar 2008 Location: YYZ iTrader: (5) Garage List 2002 BMW M5 [10.00] 2009 BMW 335i [10.00]	Did you check your coupler to your throttle body? Mine popped off again -_-
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02-22-2015, 09:50 AM	#14
robc1976 DIYER 614 Rep 5,521 Posts Drives: E90 335i Join Date: Mar 2012 Location: Illinois iTrader: (14)	Check the vac lines __________________ JB4 G5, Stage 3 LPFP, Stage 2 MOTIV PI, VM 6466 ST, Custom OCC W/ SS lines, ER FMIC, ER CP W/HKS BOV, M3 control arms, M3 guide rods, M3 upper links, M3 front & rear sway-bars, HPA rear toe arms, Wavetrac LSD, HPF Gen 2, DEFIV kit, KW clubsport, Delrin solid SF bushings, stoptech rotors, Rogue Tranny Mounts, 1M bumper, M3 CF hood, M3 fenders, M3 OEM sideskirts, Mtech rear bumper, CSL trunk, MORR VS8.2 rims 245/295
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02-23-2015, 09:20 AM	#15
Starscream Colonel 135 Rep 2,120 Posts Drives: ///M Roadster + E92 335i 6MT Join Date: Dec 2007 Location: Park Ridge NJ + Windermere FL iTrader: (23)	Embarrassingly enough I believe this was a boost leak, I took off the chargepipe and cleaned all fittings, Put a new throttle body O-Ring on and reseated the synapse valve to the CP, Seems like its got its sound back, I'm awaiting a boost gauge from ECS so I'll know what kind of numbers I'm making rather than the gauge hijack from the JB4 but I'm pretty sure I found it even though there was nothing obvious when removing the chargepipe, I guess just re-seating it all back together helped? __________________ Imola Red Roadster
	Appreciate 0 Quote

02-23-2015, 02:04 PM	#17
E92cpe Private First Class 8 Rep 116 Posts Drives: E92 coupe auto sport package Join Date: Sep 2014 Location: Newport News, Va iTrader: (1)	That's awesome Starscream. Glad you figured it out!
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02-24-2015, 10:19 AM	#19
blaster3500 Lieutenant 143 Rep 567 Posts Drives: 07 E90 335i Join Date: Aug 2010 Location: Seneca, SC iTrader: (7)	Get a USB cable for the jb4. Logs will help much more than a boost gauge. You can see if you are hitting target.
	Appreciate 0 Quote