Weird Synapse BOV behaviour

Spark365 · 11-03-2022, 05:17 PM

Hi everyone,

My Synapse BOV is acting pretty weirdly

When I do a pull on 3rd gear, and release the throttle from WOT, sometimes there will be a big delay from the throttle releasing to the "woush" sound. Also, it will be a lot quieter than the normal sound. Is it really a BOV problem or maybe the throttle plate doesn't close properly? Any help would be appreciated

studio54 · 11-04-2022, 02:41 AM

Quote:

Originally Posted by Spark365

Hi everyone,

My Synapse BOV is acting pretty weirdly

When I do a pull on 3rd gear, and release the throttle from WOT, sometimes there will be a big delay from the throttle releasing to the "woush" sound. Also, it will be a lot quieter than the normal sound. Is it really a BOV problem or maybe the throttle plate doesn't close properly? Any help would be appreciated

Hi,

How old is your BOV? Maybe it just need a service (new gaskets + fresh oil) ?

Spark365 · 11-04-2022, 04:20 PM

Quote:

Originally Posted by studio54

Quote:

Originally Posted by Spark365

Hi everyone,

My Synapse BOV is acting pretty weirdly

When I do a pull on 3rd gear, and release the throttle from WOT, sometimes there will be a big delay from the throttle releasing to the "woush" sound. Also, it will be a lot quieter than the normal sound. Is it really a BOV problem or maybe the throttle plate doesn't close properly? Any help would be appreciated

Hi,

How old is your BOV? Maybe it just need a service (new gaskets + fresh oil) ?

I don't know exactly, I would say a couple of years. I tried pressing the bov by hand and it was actuating correctly. Also just to say that I'm stage 2 mhd right now with FBO

studio54 · 11-05-2022, 03:38 AM

Quote:

Originally Posted by Spark365

I don't know exactly, I would say a couple of years. I tried pressing the bov by hand and it was actuating correctly. Also just to say that I'm stage 2 mhd right now with FBO

Maybe it stucks sometimes depending on temperature (metal expands) and other parameters. At first, you can clean it and apply fresh oil (without changing gaskets). I do it sometimes on my Forge DV, I use some lithium grease, just a thin layer on all moving parts. Just be sure the grease is ok for high temps.

Dave92N54 · 11-08-2022, 11:28 AM

If it's infrequent, it's normal. Has something to do with how the DME is controlling the throttle.

For example sometimes when I shift my MT quickly at WOT it will not vent at all, other times it may.

Spark365 · 11-10-2022, 06:25 AM

Quote:

Originally Posted by Dave92N54

If it's infrequent, it's normal. Has something to do with how the DME is controlling the throttle.

For example sometimes when I shift my MT quickly at WOT it will not vent at all, other times it may.

It does exactly that, I was just afraid of boost surge on the turbos.

11-03-2022, 05:17 PM	#1
Spark365 Private 8 Rep 59 Posts Drives: Infiniti g35 Join Date: Apr 2020 Location: Québec iTrader: (0)	Weird Synapse BOV behaviour Hi everyone, My Synapse BOV is acting pretty weirdly When I do a pull on 3rd gear, and release the throttle from WOT, sometimes there will be a big delay from the throttle releasing to the "woush" sound. Also, it will be a lot quieter than the normal sound. Is it really a BOV problem or maybe the throttle plate doesn't close properly? Any help would be appreciated
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11-08-2022, 11:28 AM	#5
Dave92N54 Major 530 Rep 1,165 Posts Drives: 09 E92 335i 6MT Join Date: Nov 2020 Location: Westminster, Maryland iTrader: (0) Garage List 2009 BMW 335i [10.00]	If it's infrequent, it's normal. Has something to do with how the DME is controlling the throttle. For example sometimes when I shift my MT quickly at WOT it will not vent at all, other times it may. __________________ 09 E92 335i 6MT / Alpine White / Coral Red / VRSF 7.5" / VRSF DCI / VRSF Catless Downpipes / VTT Charge Pipe / Turbosmart RacePort Gen V / RB OEM Billet Turbos / CD919 Custom Tune / Bilstein PSS9s
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