Read this before you create a new thread about BOVs (Blow-off valves) - Page 4

**evilSTi7** · 05-24-2007, 10:59 PM

50/50 isn't as bad as 100 but still is not good

Lovebhai007 · 05-25-2007, 03:22 AM

I was about to get a new Hks bov for 2004 sti, but after going through this thread finally decide to spend in some performance parts.

Thanks Guys...

***Majin*** · 05-25-2007, 05:30 AM

Quote:

Originally Posted by howboutthemapplz

everyone is talking about one extreme or the other, as far as recirc or atmosphere. what does everyone think about a 50/50? now that we understand that the full atmosphere is no good... has anyone had any experience with a 50/50??? any opinions on the 50/50??

i have a 50/50 for over a year now - it's better than a full venting BOV, but it's still not as good as a full recirculating (although my car was tuned for my BOV/BPV and other mods).

variable · 07-24-2007, 04:52 PM

Quote:

Originally Posted by Majin

i have a 50/50 for over a year now - it's better than a full venting BOV, but it's still not as good as a full recirculating (although my car was tuned for my BOV/BPV and other mods).

What made you decide to go with a 50/50 over a full recircluating valve? On that note, I know in the rally vids I've watched you can hear the BOV... is that a 50/50 as well, or is it full recirc and its just very noisy? Or something else?

***Majin*** · 07-25-2007, 06:07 AM

i went with a 50/50 because i wanted the BOV sound and some backfire, but not a rich stumble that couldn't be mostly corrected with a protune.

i am uncertain of the rally cars.

lackskill · 07-25-2007, 06:11 AM

Those rally cars are a completely different animal. Other than the general shape of the body and displacement of the motor, there are no real similarities.

lackskill · 07-25-2007, 06:12 AM

and what you were hearing was probably anti-lag.

2MANYCARS · 09-04-2007, 05:35 PM

Great thread. I also put my old Blitz BOV from my old rex onto my STi, just for giggles and time killing. Anyway, although the car makes lots of cool noises, like compressor surge flutter, hissing noise with no boost, pssshh between WOT shifts, and bang-bang from the exhaust, but I can tell my car is telling me to take this POS off. The car drove like crap, made me feel like I was driving a Dodge Shadow from the 80s, so I took it off right after and went for a drive with the stock BPV, much nicer, everything went back to normal. It was nice to kill an hour though.

Seppo · 01-22-2008, 09:31 AM

Ok so from this thread we can deduce that there are a lot BOV cons. I still dont see any pro's...

Do they exist? The noise doesnt count.

***Majin*** · 01-22-2008, 10:53 AM

depending on your aftermarket BOV/BPV you may need one after running higher than approximately 22 PSI. someone that knows the exact limit on the OE BPV could chime in with less ambiguous info.

Okeyd57 · 01-22-2008, 11:22 AM

Quote:

Originally Posted by Majin

depending on your aftermarket BOV/BPV you may need one after running higher than approximately 22 PSI. someone that knows the exact limit on the OE BPV could chime in with less ambiguous info.

When my tuner dynoed my 06 STi with a 20G, he went to around 22-23 lbs. of boost, and the stock bpv would not stay closed, so I had to get a bov.

Seppo · 01-22-2008, 12:33 PM

^ Can't you just get BPV that will hold better than stock?

***Majin*** · 01-22-2008, 01:43 PM

you can crush the OE BPV so that the spring's set is closer to the valve itself, in turn increasing the amount of boost the valve will stay shut against. you only have one chance to do it right though, so if your tuner is familiar with this "mod" and has done it already, i would probably let your tuner crush it.

i was more comfortable with just getting a BPV/BOV instead that has the ability to recirculate 100%.

EESTI · 01-26-2008, 06:39 PM

I have a few further questions. Is anyone running a blow through MAF after the BOV? If so, theoretically it wouldn't matter right?
Also, does a BPV reduce lag between shifts with larger turbo's?

How does the spring rate (15 lb, 7 lb ect) rating in a BPV or BOV compare to your boost levels?

***berdugo*** · 01-26-2008, 07:07 PM

Quote:

Originally Posted by Seppo

Ok so from this thread we can deduce that there are a lot BOV cons. I still dont see any pro's...

Do they exist? The noise doesnt count.

The only reason I know for using BOV is that if you are using Hydra of other EM and running w/o the MAF. If you have a ball bearing turbo, why not try to run it w/o BOV or BVP like Crawford does? modaddicts car runs very nice w/o the BVP/BOV

If you are using the stock turbo, just stick with the stock BPV

05-24-2007, 10:59 PM	#46
evilSTi7 The Hoff Fan Club, member #001 Car: 05 WRB/Gold Fav Mod: Hood Scoop Homer Location: Where ever The Hoff is! Posts: 10,325 Join Date: Jul 2004 Trader Rating: (4)	Re: Read this before you create a new thread about BOVs (Blow-off valves) 50/50 isn't as bad as 100 but still is not good This ad is not endorsed by this member. Please register or login to hide this ad.

05-25-2007, 03:22 AM	#47
Lovebhai007 Amateur STI Driver Location: Somewhere In Asia Posts: 20 Join Date: Mar 2007 Trader Rating: (0)	Re: Read this before you create a new thread about BOVs (Blow-off valves) I was about to get a new Hks bov for 2004 sti, but after going through this thread finally decide to spend in some performance parts. Thanks Guys...

07-25-2007, 06:07 AM	#50
*Majin* A.X.D. Car: 2004 STi Location: LI, NY Posts: 12,792 Join Date: Apr 2004 Trader Rating: (2)	Re: Read this before you create a new thread about BOVs (Blow-off valves) i went with a 50/50 because i wanted the BOV sound and some backfire, but not a rich stumble that couldn't be mostly corrected with a protune. i am uncertain of the rally cars.

07-25-2007, 06:11 AM	#51
lackskill Moderator Car: 05 Ram 3500 CTD Fav Mod: Majin Posts: 14,619 Join Date: Apr 2006 Trader Rating: (9)	Re: Read this before you create a new thread about BOVs (Blow-off valves) Those rally cars are a completely different animal. Other than the general shape of the body and displacement of the motor, there are no real similarities.

07-25-2007, 06:12 AM	#52
lackskill Moderator Car: 05 Ram 3500 CTD Fav Mod: Majin Posts: 14,619 Join Date: Apr 2006 Trader Rating: (9)	Re: Read this before you create a new thread about BOVs (Blow-off valves) and what you were hearing was probably anti-lag.

09-04-2007, 05:35 PM	#53
2MANYCARS Junior STI Driver Car: 2007 Subaru Impreza Fav Mod: Cobb AP Location: Tri-State & Overseas Posts: 99 Join Date: Aug 2007 Trader Rating: (1)	Re: Read this before you create a new thread about BOVs (Blow-off valves) Great thread. I also put my old Blitz BOV from my old rex onto my STi, just for giggles and time killing. Anyway, although the car makes lots of cool noises, like compressor surge flutter, hissing noise with no boost, pssshh between WOT shifts, and bang-bang from the exhaust, but I can tell my car is telling me to take this POS off. The car drove like crap, made me feel like I was driving a Dodge Shadow from the 80s, so I took it off right after and went for a drive with the stock BPV, much nicer, everything went back to normal. It was nice to kill an hour though.

01-22-2008, 09:31 AM	#54
Seppo No Rice Car: 06 OBP STi Fav Mod: Brake dust Location: Jersey Posts: 635 Join Date: Sep 2007 Trader Rating: (1)	Re: Read this before you create a new thread about BOVs (Blow-off valves) Ok so from this thread we can deduce that there are a lot BOV cons. I still dont see any pro's... Do they exist? The noise doesnt count.

01-22-2008, 10:53 AM	#55
*Majin* A.X.D. Car: 2004 STi Location: LI, NY Posts: 12,792 Join Date: Apr 2004 Trader Rating: (2)	Re: Read this before you create a new thread about BOVs (Blow-off valves) depending on your aftermarket BOV/BPV you may need one after running higher than approximately 22 PSI. someone that knows the exact limit on the OE BPV could chime in with less ambiguous info.

01-22-2008, 12:33 PM	#57
Seppo No Rice Car: 06 OBP STi Fav Mod: Brake dust Location: Jersey Posts: 635 Join Date: Sep 2007 Trader Rating: (1)	Re: Read this before you create a new thread about BOVs (Blow-off valves) ^ Can't you just get BPV that will hold better than stock?

01-22-2008, 01:43 PM	#58
*Majin* A.X.D. Car: 2004 STi Location: LI, NY Posts: 12,792 Join Date: Apr 2004 Trader Rating: (2)	Re: Read this before you create a new thread about BOVs (Blow-off valves) you can crush the OE BPV so that the spring's set is closer to the valve itself, in turn increasing the amount of boost the valve will stay shut against. you only have one chance to do it right though, so if your tuner is familiar with this "mod" and has done it already, i would probably let your tuner crush it. i was more comfortable with just getting a BPV/BOV instead that has the ability to recirculate 100%.

01-26-2008, 06:39 PM	#59
EESTI Junior STI Driver Car: WRB 06 STI Location: Buffalo, NY Posts: 50 Join Date: Sep 2006 Trader Rating: (0)	Re: Read this before you create a new thread about BOVs (Blow-off valves) I have a few further questions. Is anyone running a blow through MAF after the BOV? If so, theoretically it wouldn't matter right? Also, does a BPV reduce lag between shifts with larger turbo's? How does the spring rate (15 lb, 7 lb ect) rating in a BPV or BOV compare to your boost levels?