toyotabike

iTrader: (1)

Can someone please explain EXACTLY how the stock BOV work........



So there are 3 hoses connected to it. One small and 2 big hoses.

The small is the vacuum line. One big going from BOV to the intake manifold piping. The other big hose is going back to the turbo inlet piping.

Does the valve open only when there is vacuum applied to the small line?

blacktab420

iTrader: (12)

First of all, it is not a blow off valve. It's a Diverter Valve.

So it recirculate the air back into the air intake when you release the gaz pedal.

shifthard

iTrader: (2)

Wow you really answered his question. Lol. I think the OP knows what a diverter valve does but hes wondering how it works.

First of all, gas is spelled GAS not gaz.
Blow off valve , diverter valve, bypass valve, etc they basically refer to the same thing. They're all there to relieve pressure.

I found this in another thread.
" During normal operation under idle conditions there is a vacuum applied to the top of the stock diverter valve, and the valve is partially open. Also during idle conditions the upper IC pipe has very slightly positive pressure in it (much less than 1 psi of pressure). If you take the hose that connects the stock diverter valve to the intake off you will feel a small amount of air coming out of the hose. This is perfectly normal.

Under heavy load conditions there is boost applied to the top of the diaphragm in the stock diverter valve helping to push it closed along with the pressure from the pre-load spring. When the throttle plate shuts you now have a vacuum on the top of the diaphragm and this pulls the valve open along with the boost pressure in the upper IC pipe pushing the valve open."

Here's the other thread.https://www.evolutionm.net/forums/en...alve-tech.html
Hope this helped.

novem

iTrader: (2)

When you lift off the throttle, the throttle plate closes creating vacuum and pulling the BOV open to let the boost pressure recirculate into the turbo intake, and not go into the intake manifold.

N

toyotabike

iTrader: (1)

Thanks for the info. I know what the valve does, but I was unsure what exactly is happening inside.

boostless

iTrader: (21)

It's actually the opposite...the excess pressure from when you close the throttle plate pushes the DV open. Unless you're running a pull type bov (i.e. synapse)

3K

iTrader: (9)

Also it's to divert the air so that it doesn't go back into the turbo backwards through the turbo oulet and spin the wheel backwards.

toyotabike

iTrader: (1)

Yeah, your statement does not make any sense. If you close the throttle plate, boost will stop flowing into the intake manifold and that is why your car slows down.