Which BOV for '05 STi???
Guest
Posts: n/a
ummm lol how will it cause hesitation ? just curious, considering when you upgrade to a better bov that can exit pressure faster out of the intercooler and plumbing, allowing your turbo to spool faster inbetween shifts. Again, just wondering how you explain hesitation?
Thanks.
Thanks.
Registered User
iTrader: (12)
Joined: Nov 2002
Posts: 18,369
From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
Because your MAF sensor has measured air that the ECU expects to go through the combustion process. When you vent it off, the engine runs extremely rich (which is very bad for your catalytic converter, and you can be denied warranty repairs if it fails) and this causes the hesitation. Also, venting the pressurized air causes the turbo to have to "start over" to pressurize the manifold. Recirculating that air helps that process to go faster. Those two things are why stock bypass valves are better.
Registered User
iTrader: (12)
Joined: Nov 2002
Posts: 18,369
From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by sebring vetran
BAN,
You can also just remove the silencer in the fender and then you can hear the factory valve quite well.
what and where is the silencer in the fender? does this effect waranty?
You can also just remove the silencer in the fender and then you can hear the factory valve quite well.
what and where is the silencer in the fender? does this effect waranty?
Guest
Posts: n/a
Even if you are venting back to the manifold like the stock bov does, it is still preferable to have an aftermarket bov that can vent better and more efficiently to the manifold then the stock bov, as a gfb stealth which is adjustable can do, making hesitation non existent. I dont think its wise to say all aftermarket bov's are going to cause " a little hesitation", cause honestly thats not true. True if you are venting 100% to atmosphere you will run into a host of problems, idleing, maybe even hesitation and for sure running rich, but thats not to say that there isn't a better bov then stock out there.
Guest
Posts: n/a
I had a Blitz BOV that i took off of my 03 WRX and installed it on my 04 STI before I even pulled the STI off the lot. Later I added a turboXS downpipe, catless midpipe and JIC titanium cat back. Then the car started to backfire all the time. I got it down to a "T". I could make people duck for cover. When gas prices began to go up i decided to put the stock BOV back on and low and behold, the backfire went away. So yeah I'm thinkin A/F was leaning on the RICH side. Thanks, but I'm perfectly happy with my stock BOV. Besides you can still hear it make a cool whoooosh! sound inside the cab.
Guest
Posts: n/a
omg lol, venting faster back into your manifold, hence alowing quicker spool up,its simple, not rocket science here, a better bov that vents better and quicker back to the manifold is giong to allow quicker spool up right???? now how hard was that to understand bud? lol..
Guest
Posts: n/a
Originally Posted by whoosh
omg lol, venting faster back into your manifold, hence alowing quicker spool up,its simple, not rocket science here, a better bov that vents better and quicker back to the manifold is giong to allow quicker spool up right???? now how hard was that to understand bud? lol..
Guest
Posts: n/a
yeah. But you're going to need some kind of CPU like a stand-alone system like MOTEC's or a piggy back system such as the TurboXS UTEC or Vishnu's XEDE. You can also check out Apex'is S-AFC, but I haven't heard anyone comment on how or if this works with the STI's complex CPU setup, and then you have the reflash. Prodrive in Irvine California has the ability to reflash your stock CPU. With the provided software from a piggyback system or stand-alone you can download onto a PDA, laptop, or even a gameboy for some companies then you try to find your stoich 11.5:1. However, what is happening is the air flows past the MAF sensor located on the air intake, the data is recorded then the computer sets a mixture depending on the amount of air that has passed by the MAF. the air cycles thru the turbo, gets compressed and runs into the TMIC for cooling then into the intake manifold. However, with an atmospheric BOV, all that air that has run past the MAF gets vented out to the atmosphere and doesn't make it into the engine. The computer doesn't know that the air has been vented and therefor too much fuel is added making the car run rich after you have "blown off" so to say.
Remember lean is fast. too lean=too hot and too hot=melting metal. Rich will preserve the life of the engine but increases fuel consumption and unburned fuel into the exhause causing backfires and such.
Remember lean is fast. too lean=too hot and too hot=melting metal. Rich will preserve the life of the engine but increases fuel consumption and unburned fuel into the exhause causing backfires and such.
Guest
Posts: n/a
Originally Posted by whoosh
razorlab get a clue bud would ya... People dont need a bunch of bs from a kid who has no clue,seriously dont be ignorant lol,grow up or at least put some substance to your jackass coments
I would love to hear what your definition of compressor surge and all that other turbo tech talk is.
Originally Posted by whoosh
omg lol, venting faster back into your manifold, hence alowing quicker spool up,its simple, not rocket science here, a better bov that vents better and quicker back to the manifold is giong to allow quicker spool up right???? now how hard was that to understand bud? lol..
Last edited by razorlab; Aug 11, 2004 at 07:07 PM.
Guest
Posts: n/a
what are you talking about man seriously already, this getting old, i never said anything about taking away load genius if you can read , ummm can you?? lol, anyways if you would take the time think yourself,and read ahem, all i was trying to say is that with an adjustable bov like the gfb stealth for instance, you can still vent or recirculate back to the manifold like stock, keeping load the same just quickening the process. Can i teach you something else?