What BOV can be redirected to intake??
 

My stock BOV on 7mgte is not closing completly under boost. What can i replace it with that i can redirect to intake?? Definatly want an aftermarket not the stock P.O.S.

You can use a SAAB BPV, info on that is here. I believe that is a piston-type BPV

Ran one on my MKIII. They flow well and have a fairly quick response time. They're inexpensive and (if you're into sound and have an aftermarket intake) are a little bit louder when they vent.

howd he make the biger adapters?
Im down with that replacement.. I think the BPV is better anyhow.
any insight on the hoses you used and the adapters?

Thanks for the link thats a great idea. Any idea how much boost they can handle whn I'm done with my build ill only be around 18 absolute high boost more like 15 regularly. How will this hold up. I also seen u can get an adapter for rs style bov for the saab 9000 a lot of those have straight discharge port.

http://www.supras.com/sogidb/techcen...s/9653hoot.wav

the bosh saab bov sounds like an owl.

There are a few bov's which can be recirculated, Greddy, Synapse, HKS... IIRC all of these makers make adapters for certain models of their BOVs.

The Bosch shown in that writeup is only really good up to 12-13psi. Beyond that there are other versions of it (by Bosch) which will hold more but cost a bit more. Shouldn't take much research to find the model number... I can't remember it.

You could always run TWO Bosch BPVs. ;)



NOTE: BPV = ByPass Valve a common name for a recirculating BOV (Blow Off Valve).

What the hell is that?? Compressor surge through a BOV with lips??

I've run the Bosch BOV on two different cars and know several people locally who run them. They make a flat out Whoooosh sound.. no whistle, no flutter.

Interestingly, it seems, my stock BPV on my 2 (which is behind a VAFM) seems to be louder.... I really don't think it is, just the fact that it's behind me and very close compared to my Supra's makes it seem that way.

lol idk it was on the sogi page for the saab bov install.
is it really all that difficult to install it.. larger hoses and so forth. still caught up on getting larger adapters. they would have to taper to fit into the stock locations.

Go to the parts store, go in back and find two hoses which reduce.... sheesh... get over it, it's no big deal... you don't need to go to the trouble of building some sort of adapter.

No BOV will ever sound more impressive than the duck call BOV. I'm thinking about piping one in as a secondary with a VSV on the signal hose so I can turn it on and off at will.

wtf... hmm must of hit edit instead of quote.

my bad.

n/p.... I have madddd powah!!! ;)

Now this thread kinda hits on a subject I've been pondering during my enforced downtime, if I were to plumb in an extra BOV (Currently fitted is a Bailey twin piston valve, was thinking one more of the same) is the effectively doubled BOV venting capacity going to do anything other than produce a shorter, sharper "PSHH" when coming off the throttle?

(Bearing in mind I have an auto so am not worried about reducing spoolup/lag times post gearshift, just after venting quicker primarily to scare peds. more, but also on the theory that quicker venting of excess boost on closing the throttle might be better for the turbo bearings...)

you're not going to see a major benefit unless you're running a massive amount of boost.

That's kinda how I figured it would be on the benefits to the turbo side of things, and it is only running about 10psi but it does seem to take a couple of seconds for the boost to bleed off when the single BOV opens (maybe I'm exaggerating things in my mind, not driven the damn thing for months & it's sending me :crazy:!) and really the main thing I'm after is to change the blowoff sound from a PSHHHHH to more like a PSH!!.

Maybe I'll just plumb in the original recirc. valve (but venting to atm.) alongside the Bailey BOV & see what sort of effect that has before spending money I don't have yet on something I already have one of...

Your ECU looks for that air between shifts it will almost certainly bog down or backfire when u lift off the throttle when i had mine to the atm. just for troubleshooting it ran like a dogs a$$. definatly wouldnt reccommend that!! unless you run some kind of AFC to change the parameters during shift point...even then it takes alot to get right with out aftermarket EMS or MAFT PRO.. or in other words.. $$$$$$$$$$

Already running single BOV and it's fine, thanks though. Mine's auto but doubt that makes a difference...

yea you would need an safc + a wide band sensor .. thats at least 400..

Few people experience no issue... some just run rich but most run rich enough to at least backfire once in a while. Running both BPV and a BOV is not unheard of on vehicles with air flow meters, it cuts the negative effects in half and improves tip in throttle response over running with just a BOV... somewhat.

if i were to change to a bov instead of a BPV i would probably run one of each in sequential sequence. altho of course i have an safc so i can modify my decal air..

maybe it is the fact that it's an auto then that means I'm not noticing the rich spot caused by dumping boost.

At the end of the day I'm not too worried if it does go rich for a split second, after all it's only when the BOV is active (not half as much as it is on a manual), the rest of the time the motor's getting 100% of any air it meters. A second BOV wouldn't affect over-run mixture any more than a single one would since all the boost is already getting vented to ATM, it would just be vented marginally quicker if a second was installed.

I think this has kinda gone off on a tangent since I already have the one installed & wasn't enquiring about any issues with that, simply whether there's any real benefit to installing a second BOV at only 10psi or if it would simply result in a different sound (which is all I'm after really)...

Anyway I think most of my cash is gonna go the 2-wheeled route now, I'm that much of a glutton for punishment!

well be careful. I known people to put their bike away and never take it back out after a close call.

no

yes


Dual BOV's should have independent vac sources. Running the second with a tighter spring so that is opens a little later and only when there's a stronger signal can also be desirable.



I'll speculate and add that you may notice more of a richness at shifts after this with the auto. The point about auto's is a good one which I hadn't previously considered... thanks for bringing it up. :D