That's definitely a good point. Just from my experiences I've had, the turbos blow off in a very short burst while the centrifugal superchargers blow off is very long.

 

is there any blow off valve FAQ pages for superchargers on the site? I'd like to read up some more on installation and how they operate and what not. a quick BOV FAQ query turns up a only 6 results.

 

Replace the stock comptech / vortech bov with an aftermarket one, run a vacuum line to it and your done. Its as straight forward as it sounds.

They are used to release the pressure in the intake pipes when the throttle is closed so you don't either bend your throttle body (very high pressure applications) or force air through the compressor in the wrong direction. How they work is very simple when you think about how they are designed.

You have a spring with a vacuum / boost source on one side of it and moving air on the opposite side. At idle, the car is in total vacuum and the compressor (whether it be a SC or a turbo compressor) is creating positive pressure relative to the engine. In this case, the vacuum in the line running to the bov pulls it open and allows the positive pressure of air to exit (or if its a small compressor, it allows the engine to suck air through the bov bypass the compressor creating less throttle lag.)

The same happens under normal driving really.

Under WOT / positive boost pressure load, the positive pressure in the vacuum lines coupled with the fast moving air in the intake pipe forces the bov closed. When you let off the throttle, there is an immediate vacuum which forces the bov open.


Just think about it, its fairly simple.

 

well when you put it that way it is simple lol. thanks man

 

ok so next question, and i prolly expect some flaming, but what does a esm do? i finally found out it was an acronym (LOL) for electronic signal modifier.

 

It hides boost from the stock ECU by limiting the amount of voltage coming from the MAP sensor.

 

IMO this is a much better question than asking about BOVs

 

I guess since there were no books called "supercharging s2000's for dummies" and I have zero experience with superchargers I thought this was the appropriate area to post. the only reason I asked about bov's was because, again, I have zero experience with sc's and I didn't know if every set up had one or if there were different ways to release pressure and what not. I thank you guys though for taking the time to answer my questions. the FAQ page is a great tool also...i just didn't find some answers.

 

plz dont read about statement as me being a smart ass. its not meant that way, just hard to hear voice tone in text you know?

 

I think he was suggesting your ESM question was a good one. Not that your BOV question was bad.