ATTN: nOObs
Thread Starter
Angry Dan
iTrader: (9)
Joined: Nov 2002
Posts: 7,183
From: www.turboculture.com
Car Info: 05 Evo VIII
Originally Posted by X-Factor
ya know, dan sits there and gives free english lessons, but he has spellin errors....interesting.
74. The way dan spells is the right way - period!
#75 BOV info- i'm tired of hearing talk of the "best"
#75 Some Blow off valve info for noobies or as i've heard it called "buuvvs". If the BOV is a VTA (vent to atmosphere) - it absolutely should cause the car to back fire. Unless modified, the BOV is positioned after the MAF (mass air flow sensor). As your turbo pressurizes air, it pulls more air through the intake past your MAF, this air travels from your turbo (now pressurized), to your IC, past the BOV and into your intake manifold. More air = more fuel = more power. Fuel calculations are made by your ECU using the input data from your MAF sensor.
Under WOT (wide open throttle) and running with boost, you are pumping a serious amount of air and fuel into the cylinders to give you the power you need. You rev up and shift, at the point that you shift - your BOV vents to atmosphere but you are still drawing a huge amount of air through the MAF, for a split second your ECU gives an proportionate amount of fuel but you just blew off all the air that would have leaned out your mixture to the correct point. End result is a super rich mixture for a split second at shifts. The unburnt fuel travels out of the block into with your exhaust gas, hits the oxygen rich atmosphere (end of the tail pipe) and ignites... tada! Backfire.
Can you avoid this? Yes, recirculate the BOV vent so that the same amount of air goes into the cylinder, you have the right mixture and no backfire.
Why do race cars run with VTA? It give a feeling of better response from your engine and turbo. This is very slight but none-the-less helpful.
I don't want allot of people out there to have bad information. The fact is that the fastest, most well tuned cars out there (JGTC 300 and 500 cars, Amuse cars, WRC etc) run VTA BOVs that cause backfires. Can you buy a bad BOV, of course - generally if you spend the money, you will get what you pay for. bottom line noobs buy what you want!
Under WOT (wide open throttle) and running with boost, you are pumping a serious amount of air and fuel into the cylinders to give you the power you need. You rev up and shift, at the point that you shift - your BOV vents to atmosphere but you are still drawing a huge amount of air through the MAF, for a split second your ECU gives an proportionate amount of fuel but you just blew off all the air that would have leaned out your mixture to the correct point. End result is a super rich mixture for a split second at shifts. The unburnt fuel travels out of the block into with your exhaust gas, hits the oxygen rich atmosphere (end of the tail pipe) and ignites... tada! Backfire.
Can you avoid this? Yes, recirculate the BOV vent so that the same amount of air goes into the cylinder, you have the right mixture and no backfire.
Why do race cars run with VTA? It give a feeling of better response from your engine and turbo. This is very slight but none-the-less helpful.
I don't want allot of people out there to have bad information. The fact is that the fastest, most well tuned cars out there (JGTC 300 and 500 cars, Amuse cars, WRC etc) run VTA BOVs that cause backfires. Can you buy a bad BOV, of course - generally if you spend the money, you will get what you pay for. bottom line noobs buy what you want!
Registered User
iTrader: (38)
Joined: Oct 2003
Posts: 7,783
From: rightBehindYou, HI
Car Info: 1973 Huevo Ranchero
75. search ***** and morality police are your friend. a little heat from them should be received in love. if you don't like their advice then leave i-club, sell your suby and go buy the new civic and street race and post on forums hawaii.
aloha from the summit of *-^-mauna Kea-^-*
aloha from the summit of *-^-mauna Kea-^-*
Registered User
Joined: Jan 2006
Posts: 66
From: sydney , australia
Car Info: 2004 Aust spec Sti
hey guys Noob here from Sydney, i will be visiting hawaii for some war games in a coupla months , so hopefully i will get to lcatch up with a few of you's while i am over there 
cheers,
Shane
cheers,
Shane
Registered User
iTrader: (26)
Joined: Mar 2004
Posts: 7,140
From: buying a house in hawaii is harder then it looks
Car Info: 2001 Impreza 2.5RS-T 2011 Forester Prem. SUBYS FTW
nice to meet ya i seen u on nasioc and good job on reading the noob sec. b4 u get flamed but not everyone reads these so just start a new thread in here and say whats up.
shaggy
shaggy
Last edited by shaggadelic; Jan 16, 2006 at 11:20 AM.
Registered User
iTrader: (4)
Joined: Dec 2002
Posts: 2,176
From: Southern California
Car Info: 2016 Z51 C7, 2007 Exige S, 2008 ZX-10R, 2016 Taco
If
you post you're a n00b, you've won half the battle. Post when you arrive, I'm always down for international relations (would help if your sister was with you). If you're pissed at that last comment, we probably don't share the same sense of humour. I'll get over it, so will you.
San
San
Registered User
Joined: Oct 2004
Posts: 151
I'm also a noob (except born in '71, so almost old school!!) live in Scotland and will be coming out to visit in September (cash willing), was over in July '05 and was at the race track up by the water parks, saw some nice scoobys parked up (including what I think is one of the dealers demo's?? silver STI, carbon hood and trunk running on crimsons??), took loads of photo's, next time I'll come over and talk.
Registered User
Joined: Oct 2004
Posts: 151
Yeah, it was Waialae Subaru that sponsored it, few 911's, a corvette etc running round the track.
When I was there, there were a couple of blue STI's, a white STI and a silver STI, there was blue wagon changing wheels for the track and a dark yellow bugeye WRX which I initially thought might have been an S202, sorry I didn't come over and chat, but felt it a bit daunting!!
When I was there, there were a couple of blue STI's, a white STI and a silver STI, there was blue wagon changing wheels for the track and a dark yellow bugeye WRX which I initially thought might have been an S202, sorry I didn't come over and chat, but felt it a bit daunting!!