Which BOV for '05 STi???
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Joined: Jul 2004
Posts: 25
From: NEW YORK ROCKLAND
Car Info: 04 STI 02 WRX
dont get a bov for an STI hinders performance and makes trust me causes problems use less noise maker port waste gate and headers intake no cold air useless with a turbo aswell dp and exhaust save the 125 plus and get a used front lip or save for rims good luck dont waste your money until you finish doing useful stuff
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Joined: Dec 2002
Posts: 1,537
From: AFK
Car Info: 04' JBP STi 02' WRB Wagon
Originally Posted by ICEDEARTHSTI
dont get a bov for an STI hinders performance and makes trust me causes problems use less noise maker port waste gate and headers intake no cold air useless with a turbo aswell dp and exhaust save the 125 plus and get a used front lip or save for rims good luck dont waste your money until you finish doing useful stuff
JXN i think he's trying to say that the bov will throw off the A/F Ratio in your car because the ecu is expecting the additional intake charge from the stock recirculating valve. If you didn't know that already, it might be something to consider, i've heard very few stories of people using a bov without tuning that have not lost power or increased lag. Just be prepared for some minor issues if you go with a bov in the end. If you want noise, the HKS SS blows off in reverse
Last edited by Seraph; Aug 1, 2004 at 12:11 PM.
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What does it mean to blow off in reverse? And would the BOV still affect the A/F ratio even if it doesn't blow off atmospherically? I know a C/A intake is useless for a turbo, but is a regular intake OK? This is the 1st subaru i've owned, still kinda learning about 'em!
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Joined: Dec 2002
Posts: 1,537
From: AFK
Car Info: 04' JBP STi 02' WRB Wagon
I mean, i've heard people with it blow off while going in reverse and letting off. If the bov does not vent to atmosphere, then it wouldn't mess up the a/f ratio. If by regular intake you're talking about short rams, there are threads on them already, just do a search and you should find the answers you're looking for.
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Originally Posted by Seraph
I mean, i've heard people with it blow off while going in reverse and letting off. If the bov does not vent to atmosphere, then it wouldn't mess up the a/f ratio. If by regular intake you're talking about short rams, there are threads on them already, just do a search and you should find the answers you're looking for.
Thanks, good stuff
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From: Are you too one of the few still living the past? Well I can change that! With a simple wicket. Yes, my friend, a wicket. PM for details.
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Originally Posted by JXN
What does it mean to blow off in reverse? And would the BOV still affect the A/F ratio even if it doesn't blow off atmospherically? I know a C/A intake is useless for a turbo, but is a regular intake OK? This is the 1st subaru i've owned, still kinda learning about 'em!
Don't get a BOV until you do some serious mods. First things first, get a new exhaust.
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lol , yeah a stock bov maybe a minimal upgrade, but it is still an upgrade with purpose. Changing your blow off valve to one that can vent faster will let your turbo spool up faster inbetween shifts. Turbo spooling up faster is definitely an upgrade for me, dont know about you guys. With my gfb stealth the difference is quite noticeable.
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From: Reno, NV
Car Info: 1993/2000/2001 GF4 mostly red
Originally Posted by whoosh
lol , yeah a stock bov maybe a minimal upgrade, but it is still an upgrade with purpose. Changing your blow off valve to one that can vent faster will let your turbo spool up faster inbetween shifts. Turbo spooling up faster is definitely an upgrade for me, dont know about you guys. With my gfb stealth the difference is quite noticeable.
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So everybody is saying for a Stock STI, leave the stock blow off valve? A friend of mine just got an 05 STI and this thing is sweet. He wants me to put a " pppsssshhhhttt thing " on. But from what I can see so far he should leave it stock.
Thanks Guys
Nathan
Thanks Guys
Nathan
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Joined: Dec 2002
Posts: 1,537
From: AFK
Car Info: 04' JBP STi 02' WRB Wagon
^^^^
Yes, the recirculating valve that comes stock is factored in by the ecu when doing a/f calculations. Its not there to deliberately restrict anything, and coverting that intake charge in to a sound instead of plumbing it back in to the intake will do some funky stuff and affect drivability of the car overall. If you get an aftermarket recirc that does 100% recirc but makes more noise in the process, then by all means go for it if you like.
Yes, the recirculating valve that comes stock is factored in by the ecu when doing a/f calculations. Its not there to deliberately restrict anything, and coverting that intake charge in to a sound instead of plumbing it back in to the intake will do some funky stuff and affect drivability of the car overall. If you get an aftermarket recirc that does 100% recirc but makes more noise in the process, then by all means go for it if you like.