Synapse BOV question

eaglesfan83 · 11-19-2011, 04:08 PM

Just installed the Syanpse BOV on the Stett Charge Pipe tpday so far so good. Took it out for a test drive and had a question to see if this is normal. Under hard acceleration it sounds good and pulls good. My problem or hopefully its normal is under very light accelation there is a perido where it sound like the BOV is stukc open and sound like whistling and will continue till I either press harder on the pedal or let off. Wanted to see if this was normal or what I should check to fix it if its not.

Thanks!

eaglesfan83 · 11-19-2011, 05:38 PM

Bump anyone?

Bakeme521 · 11-19-2011, 06:04 PM

Quote:

Originally Posted by eaglesfan83

Bump anyone?

Under light throttle the BOV is partially open so it is blowing off a little, as soon as you put your foot down it should go away. My did the same when I had one, pretty sure it's normal.

eaglesfan83 · 11-19-2011, 07:12 PM

Interesting just seems like it shouldn't do that

eaglesfan83 · 11-19-2011, 07:34 PM

Feels like its opening under partial throttle. Should I adjust the middle part on the back? Do I need to stiffen the spring? Any synapse owners have any thoughts?

G0FNDM3 · 11-19-2011, 07:42 PM

Quote:

Originally Posted by eaglesfan83

Feels like its opening under partial throttle. Should I adjust the middle part on the back? Do I need to stiffen the spring? Any synapse owners have any thoughts?

DO NOT MAKE ANY ADJUSTMENTS TO YOUR BOV! You need to PM the original owner and see if he made any adjustments. check out this thread.
http://www.e90post.com/forums/showthread.php?t=497053

eaglesfan83 · 11-19-2011, 07:55 PM

I'm giving him the benefit of the doubt for now. Hopefully he didn't sell me a broken part. Sent him a PM.

G0FNDM3 · 11-19-2011, 07:58 PM

Quote:

Originally Posted by eaglesfan83

I'm giving him the benefit of the doubt for now. Hopefully he didn't sell me a broken part. Sent him a PM.

We'll meet up tonight and see if there is a difference with yours and mine.

eaglesfan83 · 11-19-2011, 08:13 PM

I'm sure there is. It feels wrong.

stratos_335 · 11-19-2011, 09:14 PM

It is absolutely normal. Under partial throttle and engine load the bov stays open and makes a subtle whistle sound

eaglesfan83 · 11-19-2011, 09:55 PM

Problem is its not subtle. I can hear it over the radio. I drove my buddies car with a synapse and was not making the same sounds. Going to try to put his on tomorrow to see if there is any difference.

Proper Motion LLC · 11-20-2011, 01:10 AM

It's normal. Pretty sure the stock BPV would sound the same if it was venting to the atmosphere

G0FNDM3 · 11-20-2011, 08:52 AM

Quote:

Originally Posted by Rysandro

It's normal. Pretty sure the stock BPV would sound the same if it was venting to the atmosphere

It's not normal. His car boggs down randomly when under WOT. I have the same BOV and I went for a ride in his car and it sounds like a air intake under WOT when cruising at low speeds and he doesnt even have a air intake installed. We took my car for a spin which have the same BOV and it was a night & day difference. BTW my Bov was purchased brand new and not used. FWIW.

eaglesfan83 · 11-20-2011, 09:30 AM

I did use both ports a and b. car just feels like it lost a lot of power when I get on it. It loud as helr partial throttle all the way up the powerband. It will close up if I get on it and hold well. Going to mess around with it today and see what happens.

stratos_335 · 11-20-2011, 10:03 AM

Quote:

Originally Posted by Railgun

Yes, it's normal that it's open. Under light throttle you're still under vac. If you used both ports a and b, it sees a very strong vac signal. Pop one of them off and see if your response is the same.

It has always been my question. Running one port reduces response or there is any significant benefit in power?

11-19-2011, 04:08 PM	#1
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	Synapse BOV question Just installed the Syanpse BOV on the Stett Charge Pipe tpday so far so good. Took it out for a test drive and had a question to see if this is normal. Under hard acceleration it sounds good and pulls good. My problem or hopefully its normal is under very light accelation there is a perido where it sound like the BOV is stukc open and sound like whistling and will continue till I either press harder on the pedal or let off. Wanted to see if this was normal or what I should check to fix it if its not. Thanks! __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Tweet Quote

11-19-2011, 05:38 PM	#2
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	Bump anyone? __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-19-2011, 07:12 PM	#4
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	Interesting just seems like it shouldn't do that __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-19-2011, 07:34 PM	#5
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	Feels like its opening under partial throttle. Should I adjust the middle part on the back? Do I need to stiffen the spring? Any synapse owners have any thoughts? __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-19-2011, 07:55 PM	#7
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	I'm giving him the benefit of the doubt for now. Hopefully he didn't sell me a broken part. Sent him a PM. __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-19-2011, 08:13 PM	#9
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	I'm sure there is. It feels wrong. __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-19-2011, 09:14 PM	#10
stratos_335 First Lieutenant 45 Rep 332 Posts Drives: BMW 335i Join Date: Sep 2009 Location: Greece iTrader: (0)	It is absolutely normal. Under partial throttle and engine load the bov stays open and makes a subtle whistle sound
	Appreciate 0 Quote

11-19-2011, 09:55 PM	#11
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	Problem is its not subtle. I can hear it over the radio. I drove my buddies car with a synapse and was not making the same sounds. Going to try to put his on tomorrow to see if there is any difference. __________________ SOLD 2009 E92 328i AW/BL SOLD 2010 E93 335i AW/CR SOLD 2010 Audi S4 Pending- Something New and BMW
	Appreciate 0 Quote

11-20-2011, 01:10 AM	#12
Proper Motion LLC Custom Powder Coater 150 Rep 2,784 Posts Drives: White 335i Sedan Join Date: Dec 2008 Location: Orange County CA iTrader: (2)	It's normal. Pretty sure the stock BPV would sound the same if it was venting to the atmosphere __________________ www.propermotion714.com
	Appreciate 0 Quote

11-20-2011, 09:30 AM	#14
eaglesfan83 FIRE TOEZ!!!!! 92 Rep 1,207 Posts Drives: Pending Order Join Date: Jan 2009 Location: Honolulu, HI iTrader: (6) Garage List 2010 BMW 335i Vert [9.34]	I did use both ports a and b. car just feels like it lost a lot of power when I get on it. It loud as helr partial throttle all the way up the powerband. It will close up if I get on it and hold well. Going to mess around with it today and see what happens. Last edited by eaglesfan83; 11-20-2011 at 10:24 AM..
	Appreciate 0 Quote