joosh

where does everyone mount their after market bov's? are there any shop/venders that sell a charge pipe kit with a bov flange pre welded? pics would be awsome!!

ranchan02

iTrader: (4)

http://www.rx7store.net/product_p/greddyelbowflange.htm

VegasFD

You have basically 3 options. You can 1. use the Greddy elbow pictured above with a Greddy BOV, 2. buy a BOV flange and mount the BOV wherever you want, or 3., buy the Greddy Type S that comes with an adapter so it can plumbed from the location. That's what I did and it was very easy.

PS: These options differ differ wityh each manufacturer. But most supply the flanges needed for the install.

Sgtblue

iTrader: (16)

Or 4: vent the stock BOV to the atmosphere and pocket $200-$400.

VegasFD

True, in retrospect, I wish I'd done that myself. But I was planning for the future, and I figured I'd need it for when I go single.

Mahjik

iTrader: (1)

That still won't solve that fact that the stock BOV is venting until you actually begin to boost. With the aftermarket BOV's, they are not venting during this timewhich allows the turbos to be more responsive. An alternative is to have the stock BOV modified (IIRC, Garfinkle does this service).

Sgtblue

iTrader: (16)

I was looking at what was most cost effective, assuming a near stock, street driven car. If his priority is the sound, it's an alternative.

Mahjik

iTrader: (1)

I would wager that cost is not something he's concerned with if he's already made up his mind to spend money on an aftermarket BOV. Now, if he said he wanted the "cheapest and loudest BOV available", I would agree venting the stock BOV would definitely suit that criteria.

Nat6c

iTrader: (1)

on all my custom kits i get a bov with a flange and get it welded in, i personally always put mine before the intercooler unlike most other ppl. i don't see a point it dumping cooled air, and i've noticed the bov reliefs better closer to the turbo... but it might be my idea.


Los

YOUWSH

I'm also thinking of getting mine welded onto the intercooler piping and have seen most people mount it on the right side, i.e cooled air side.

Can anyone else verify whether this is the ideal side to mount it as I do agree with Nat6c over the fact that wouldn't you loose boost by having the bov dump the cool charged air?

LR

Nat6c

iTrader: (1)

well it's not so much as losing boost... it's the fact that's when you release the charged air, your dumping out air that the IC has had to cool down into no where.... and has to recool more air just to fill the T/B side back up with cool air. so why not dump the Uncooled hot air. and it'lllet the turbo spin easier since your dumping the resitance earlier (my Theory). and not dumping worked for air.

tell me if i dont' make sense.

Los

drivelikejehu

^that make sense.

but i think of it this way. the purpose of the BOV is to keep the pressurized air from coming backwards and putting force against the compressor in the opposite direction (right?). the cause of this backward motion is the flow of the pressurized air going into the engine, suddenly getting stopped when the butterfly's in the throttle body snap closed. so i imagine in my mind the surge of air bouncing off the butterfly's and coming backwards toward the compressor, and then when it reaches the BOV, it gets let out into the air. so in this approach letting it out quicker (closest to the TB) would be more desirable.

i guess what im getting at, is that is a tube full of air, and no matter where you release the air, your still going to have to fill it back up, so why not release it as quickly as you can (before it has a chance to get back to the compressor).

that all made sense in my head i have no idea if it does in words, or even if it makes sense at all. disclaimer: i have no evidence to support my claim, its just what makes sense in my mind, so please, someone correct me if im wrong.

EDIT: something else i just thought about. does the BOV release ALL of the air (relative to the atomosphric pressure) or does it just release excess air? if it just releases the excess pressure (maybe the compressor is still compressing for a second after you let off the throttle? hence excess pressure in the TB because it has nowhere to go) than i definately think that releasing it quicker would be better, since you wouldnt even have to re-pressuriaze anything.

drivelikejehu

- Primary reason is to reduce strain on the compressor turbine wheel due to compressor surge. Between shifts, or sudden throttle lift-off, the turbine is still spinning very fast (but slowing) and pumping air at the closed throttle plate, as well as placing strain on the intercooler, hoses and fittings. A CBV / BOV keeps air from flowing backwards over the compressor wheel, allowing the turbine to continue spinning freely. When back on the throttle, boost pressure quickly rises again with little lag. A suitable valve location is just before the throttle plate.


^ thats what im trying to say. they said it a little better.
http://wwwrsphysse.anu.edu.au/~amh11..._off_valve.htm