how to crush sti bpv? - Page 2

sticop · 05-15-2007, 04:18 AM

am i the only one that thinks this doesnt sound like such a good idea?

pt518sti · 05-15-2007, 06:49 AM

My experience with this has been that it causes surge especially in 5th and 6th gear when letting off under partial boost on the highway. I don't know if this is because I crushed it too much or what.
Best advice I can give on this issue is "if it aint broke, don't fix it".
I have since replaced the crushed stock BPV with an uncrushed stock BPV and it holds up to 22psi just fine and gets no surge at all under any conditions.
Almsot every aftermarket BOV/BPV seems to have some sort of downside to it, so unless you know your stock one is definitely leaking, I wouldn't bother replacing it.

sticop · 05-15-2007, 07:39 AM

^^ i agree, and im def not going to hit something with a hammer to get more performance

WolfPlayer · 05-15-2007, 08:07 AM

The reason that this seems crazy is that most people aren't doing this scientifically. Yes, you can do this the correct way instead of doing it the redneck way. What I didn't show in my pictures above is that I was using a MityVac and checking the specs on the BPV as I crushed it. That is what you really need to do. Pull a vacuum on the stock BPV and watch the piston/seal. You want to crush it such that the BPV can still open under vacuum. The whole 'hit it with a hammer' thing is almost ludicrous because you can't verify what you are doing.

This CAN be done correctly.

t

WolfPlayer · 05-15-2007, 08:09 AM

Quote:

Originally Posted by pt518sti

My experience with this has been that it causes surge especially in 5th and 6th gear when letting off under partial boost on the highway. I don't know if this is because I crushed it too much or what.

Yes, you crushed it too much. Check out the post I made directly before this one. There is a way to crush the stock BPV such that you preserve the part throttle functionality (no surge!).

t

pt518sti · 05-15-2007, 08:15 AM

Quote:

Originally Posted by WolfPlayer

Yes, you crushed it too much. Check out the post I made directly before this one. There is a way to crush the stock BPV such that you preserve the part throttle functionality (no surge!).

t

What is the item you were using to crush it with in those pictures?

***JPWEraser*** · 05-15-2007, 08:34 AM

Quote:

Originally Posted by pt518sti

What is the item you were using to crush it with in those pictures?

Looks like a socket in a vice.

WolfPlayer · 05-15-2007, 10:12 AM

Quote:

Originally Posted by JPWEraser

Looks like a socket in a vice.

word.

t

HOOKSH · 08-12-2007, 10:48 PM

im new around here so hello all. i come from a DSM background and lots of guys do this with the metal 1G valves with zero problems, and many run these for years at a time with no problems, so dont listen to the people who THINK they know what they are talking about. if you did this with a socket in a vise and used a PRECISION instrument like a micrometer. CrystalImprezav said thats how you do it, and without being smart about it, you arent going to get very smart results? you cant put **** in and get gold out

PS, i didnt realize this is such an old thread, oh well. people drag up stuff from 2003

highboost145 · 08-15-2007, 10:13 PM

Quote:

Originally Posted by WolfPlayer

The reason that this seems crazy is that most people aren't doing this scientifically. Yes, you can do this the correct way instead of doing it the redneck way. What I didn't show in my pictures above is that I was using a MityVac and checking the specs on the BPV as I crushed it. That is what you really need to do. Pull a vacuum on the stock BPV and watch the piston/seal. You want to crush it such that the BPV can still open under vacuum. The whole 'hit it with a hammer' thing is almost ludicrous because you can't verify what you are doing.

This CAN be done correctly.

t

amen.

SubieDave · 10-19-2007, 08:11 PM

Where does one get a micrometer and what exactly are we measuring? Someone please explain for us n00bs.

325boi · 10-28-2007, 08:43 PM

Quote:

Originally Posted by HOOKSH

PS, i didnt realize this is such an old thread, oh well. people drag up stuff from 2003

not that old.... it was from this year 2007....

jungo75 · 10-29-2007, 03:55 PM

So what is the benefit of this on a stock car? Another question, does the 03 wrx uses the same BPV as the STi?

sigma69pi · 10-30-2007, 07:44 AM

I am still trying to understand the point. I installed a manual boost controller and 22 psi is common. I have not had any trouble from the stock STi valve. Is this modification designed to take the place of the MBC?

05-15-2007, 04:18 AM	#16
sticop Professional STI Driver Car: 04 WRB STI Fav Mod: 255's ftmfw Location: central NH Posts: 472 Join Date: Apr 2007 Trader Rating: (0)	Re: how to crush sti bpv? am i the only one that thinks this doesnt sound like such a good idea? This ad is not endorsed by this member. Please register or login to hide this ad.

05-15-2007, 06:49 AM	#17
pt518sti S204 Racer Car: 2005 White/Gold STi Fav Mod: TD06-20G/Tein Flex coilovers Location: New York Posts: 2,909 Join Date: May 2005 Trader Rating: (8)	Re: how to crush sti bpv? My experience with this has been that it causes surge especially in 5th and 6th gear when letting off under partial boost on the highway. I don't know if this is because I crushed it too much or what. Best advice I can give on this issue is "if it aint broke, don't fix it". I have since replaced the crushed stock BPV with an uncrushed stock BPV and it holds up to 22psi just fine and gets no surge at all under any conditions. Almsot every aftermarket BOV/BPV seems to have some sort of downside to it, so unless you know your stock one is definitely leaking, I wouldn't bother replacing it.

05-15-2007, 07:39 AM	#18
sticop Professional STI Driver Car: 04 WRB STI Fav Mod: 255's ftmfw Location: central NH Posts: 472 Join Date: Apr 2007 Trader Rating: (0)	Re: how to crush sti bpv? ^^ i agree, and im def not going to hit something with a hammer to get more performance

05-15-2007, 08:07 AM	#19
WolfPlayer Moderator & ECU Tech Car: 05 CGM STI Fav Mod: mo boostaz Location: Fredneck, MD Posts: 3,578 Join Date: Jun 2004 Trader Rating: (6)	Re: how to crush sti bpv? The reason that this seems crazy is that most people aren't doing this scientifically. Yes, you can do this the correct way instead of doing it the redneck way. What I didn't show in my pictures above is that I was using a MityVac and checking the specs on the BPV as I crushed it. That is what you really need to do. Pull a vacuum on the stock BPV and watch the piston/seal. You want to crush it such that the BPV can still open under vacuum. The whole 'hit it with a hammer' thing is almost ludicrous because you can't verify what you are doing. This CAN be done correctly. t

08-12-2007, 10:48 PM	#24
HOOKSH Lurker Posts: 4 Join Date: Aug 2007 Trader Rating: (0)	Re: how to crush sti bpv? im new around here so hello all. i come from a DSM background and lots of guys do this with the metal 1G valves with zero problems, and many run these for years at a time with no problems, so dont listen to the people who THINK they know what they are talking about. if you did this with a socket in a vise and used a PRECISION instrument like a micrometer. CrystalImprezav said thats how you do it, and without being smart about it, you arent going to get very smart results? you cant put **** in and get gold out PS, i didnt realize this is such an old thread, oh well. people drag up stuff from 2003

10-19-2007, 08:11 PM	#26
SubieDave Junior STI Driver Car: 07 UGM STi Fav Mod: Gabe's stage 1 flash Location: Twin Cities, MN Posts: 130 Join Date: Aug 2007 Trader Rating: (0)	Re: how to crush sti bpv? Where does one get a micrometer and what exactly are we measuring? Someone please explain for us n00bs.

10-29-2007, 03:55 PM	#28
jungo75 Senior STI Driver Car: 06 Subaru WRX STi Fav Mod: The Hooptie Location: Maryland Posts: 380 Join Date: Jun 2006 Trader Rating: (2)	Re: how to crush sti bpv? So what is the benefit of this on a stock car? Another question, does the 03 wrx uses the same BPV as the STi?

10-30-2007, 07:44 AM	#29
sigma69pi Amateur STI Driver Posts: 12 Join Date: Apr 2005 Trader Rating: (0)	Re: how to crush sti bpv? I am still trying to understand the point. I installed a manual boost controller and 22 psi is common. I have not had any trouble from the stock STi valve. Is this modification designed to take the place of the MBC? This ad is not endorsed by this member. Please register or login to hide this ad.