FAQs » Compressor Valves: BOV/DV/Radial R35/R55 (29)

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Category: Compressor Valves: BOV/DV/Radial R35/R55

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Individual Throttle Body Engine (ITB): Why won't by DV/BOV open?


Is it okay to run two dedicated vacuum lines for the BOV/DV?


Is My BOV/DV/R35/R55 Kit Missing Components?


My BOV leaks at idle or low load situations!


If you feel that there is something wrong with your Synchronic BOV being open at idle, do not be concerned. This is normal, and your BOV is functioning as intended.

By bypassing the restriction of the turbo, intercooler piping and all the surface area of the intercooler, you get better throttle response when coming off of vacuum, as well as fuel economy (if you care about that sort of thing). The engine does not have to work as hard to overcome those restrictions when the BOV is venting at idle or low load situations.

However, if the “hissing” sound is not to your liking you can switch to a different port configuration.  The Synchronic BOV has 3 configurations to allow for initial reaction (opening) of the valve.  The order of fastest to slowest initial reaction (opening) is B --> A+B --> A. 

Port Configurations:

1.)    Port B to intake manifold pressure, A to atmosphere:  If you have a very fast spooling turbo/sc, use this setup.  Allows for the fastest valve reaction resulting in fastest throttle response, as seen on our bench tests. 

2.)    Port A+B to intake manifold pressure: Recommended setup for most people.  The valve will stay closed longer than if using just port B. 

3.)    Port A to intake manifold pressure, B to atmosphere:  The valve will stay closed longer than if using port A+B.


My BOV/DV/R35/R55 is open at idle, what does this mean?


My stock or XXX brand BOV had only 1 port going to vacuum. How do I connect the 2 ports on my BOV to my engine?


My valve opens after X amount of boost, how do I keep it closed?


Proper Boost-Leak Test Procedure


SB & DV Adapter Flanges Compatibility List


Things to Know Before Purchasing a Synapse Compressor Valve

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