Mr2 turbo bpv info...

Q&A regarding engines, turbos, and intercoolers and power upgrades

Mr2 turbo bpv info...

Postby OlyST185 » Fri Oct 01, 2004 4:06 am

I heard that mr2 people really love that bpv OEM because it does reroute the air in a different way, i dont rreallly know what it is. someone know it
(nice sound that stock bov not rerouted)
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Postby illGT4 » Fri Oct 01, 2004 7:54 am

I believe it simply re-routes the air back into the intake. Same as the ST205 setup.

(edit- I am wrong, read below)
Last edited by illGT4 on Fri Oct 01, 2004 8:06 am, edited 1 time in total.
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Postby illGT4 » Fri Oct 01, 2004 8:06 am

I did a little reading for you:


"The BOV has two chambers on either side of a diaphragm, one smaller and one large. When you boost, the chambers are pressurized, but the larger chamber has more contact area with the diaphragm so the diaphragm stays closed. However, when you let off the throttle, the large chamber is emptied, and the small chamber is not, because the VTV is inbetween the small chamber and the rest of the induction system. The VTV restricts flow in the reverse direction, so the smaller chamber doesn't instantly depressurize. This causes the diaphragm to be pushed open by the smaller chamber, opening the BPV.

If the vacuum line to the smaller chamber is disconnected, this chamber will always be at atmospheric pressure, so the BPV will open whenever you are in vacuum and will close whenever you are under boost. So, if you have been boosting and suddenly lift off the throttle, the BOV will open once you hit vacuum. However, if you do have the VTV, the BOV will open as soon as you lift off the throttle, and it will also have more pressure pushing it open, so it will all around respond better.

If the smaller chamber has a vacuum line to it with no VTV, than the BPV will never open."

MORE INFO:

"The stock BPV has a VTV (vacuum transfer valve) that looks like a check valve. The VTV has a check valve to allow boost into the lower chamber and a bleed hole to allow the BPV lower chamber to remain at a higher pressure than the top chamber for a short period of time. This allows the BPV to respond much more quickly than an aftermarket BOV. For the BPV to work correctly, you need the VTV. There is no adjustment on the BPV."



Hope this Helps,
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Postby OlyST185 » Fri Oct 01, 2004 11:13 pm

oooh yeah thanks, thats a very nice system
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Postby busdriver » Sat Oct 02, 2004 4:36 am

I happened to have the stock BPV from a DSM (1st gen) laying around so I made a flange to fit in the Samco T hose and it works great so far. I haven't had time to make an intake so at the moment it vents to atmosphere and is really loud. This might be a low cost solution for you. Just out of curiousity, anyone know how these compare to the other options for BOV/BPV?
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