ok, so basically the audi system is a closed system. gotcha. I believe the subaru wrx system is closed OEM as well, but I have seen both recirc and atmosphere BOV's so I was curious if anyone had ever actually done it, and what had happened. I think the fact that you can adjust the BOV could compensate for air fuel issues (ie set it to blow off at higher PSI and later so its not bleeding air earlier, and wouldn't be rich) but obviously this isn't something I'm really interested in tinkering with, as the consequences could be disasterous. Thanks for the info.

also, I guess with regard to the cold air I was looking for something that was cold air/less restrictive than the stock system. Cold air obviously being less important, though from my experience the best systems to reduce restriction are cold air systems. that may not be the case.

anyway, thanks for the info, and I understand agrivation with people who have no clue, believe me, its my life. for future reference, the newb tag belies my knowledge. wish I could do something about that damn tag, but I can't.

thanks for the responses fellas.

 

Another way to make your car less restrictive is - Full cat back exhaust.

Before I got my Borla exhaust I never heard the turbo spool once, but now I can hear it spool and everything feels smoother.
Its definitly helped the restriction the stock system had

 

IF you knew as much as you say you do, you would know using a BOV is a bad idea. The MAF sensor is BEFORE the DV which means the air coming in is measured before it gets diverted back into the intake and the ecu is making adjustments for fuel-counting on that recir. air. If you use a BOV it will dump the air the ecu is counting on -providing fuel for. When that air doesnt make it to the engine there is a surplus of fuel being (trying to be) combusted and you will run rich causing fouled plugs, clogged cat, poor mpg and fucked up 02 snesor readings resulting in further decreased performance. There are all kinds of badshort and long term affects by using a BOV UNLESS you reconfigure your turbo plumbing so that the MAF is after the BOV or if you are tuned to run without a MAF. Intakes do nothing for the stock turbo. If you have a big turbo its a necessity. Because there is no true CAI for a 1.8t, the exposed filter has no place to go except to sit right next to the hot turbo/maifold/cat which will only give you heat soak. Only a few people have taken the time and effortto fabricate a heat shield that is actually beneficial in eliminating heat soak for these engines with the use of anaftermarket intake. Good luck.
Ahhh.. i see your response.... NICE. I wasnt yelling btw. It was more of a cut and paste from previous BOV/CAI questions.

 

Wrong wrong wrong. NO BOV its a DV. Anyway a cold air intake will suck in more hot air then a stock airbox. The CAI is open to the engine bay. The stock airbox gets all its air from the little snorkel in the grill. A CAI just sucks in more air and allows your DV to make a ppssshhhh noise when you let off the gas. By the way I love my EVO CAI and I experience no heat soak. My heatshield is doubled up with the EVO heatshield nex to my stock one and I kept the snorkel in to funnel outside air straight into my filter. Me like, and now that I have my exhaust and high flow cat my intake is much louder and sounds like a fricken jet engine. Well not really like a jet engine but the intake definately makes itself known and adds to the overall sound of the car plus it makes my turbo sound happy! I cant wait to drop in my K04

 

couple things. first of all, I'd like to say that all of the cars I've worked on with with forced induction, people SWEAR by BOV's. some of them do have SAFM, but not all. Some of them pipe the blow off back into the system, some don't. either way, they are all very pleased with their aftermarket systems, and a few (my brother included) have had BOV's on their cars for over 50,000 and have had no ill effects as far as sensors and emission systems go. now, I've never done this with an audi, which is why i came in here and asked the question, so I don't know what would happen, hence trying to find someone who HAS done it to help me out.

2. I obviously am not going to buy a cold air intake that takes its air directly from the engine compartment. that wouldn't really be a cold air intake would it?

and yes, I know exhaust is the way to go to boost the horsepower, but i don't have $2000 hanging around at this point. sooo...yeah. but better air flow into the turbo and intake would most definitely have SOME effect on thecar other than making it hiss when the DV discharges.

 

Don't be afraid to say BOV!

Those that understand what a BOV does, that there are different types of BOVs, and understand what a DV does ... will understand you when you say BOV. They'll just state that your BOV must recirc.

 

THANK YOU!!!! THESE PEOPLE WERE REALLY CONFUSING ME!!!!

I could not figure out what the hell they were talking about. I mean if you recirc the BOV it does the exact same thing, except you can adjust the PSI that it blows off at!!

THANK YOU!

 

Borla Cat-Back exhaust at factory price from borla muffler specialist place = 700$

Installation = 100$ even

Taking off two resonators for a more beefy sound = 100$

Total = 900$ no where near 2000$ and it was worth every penny! Go exhaust

 

the exhaust I'm looking at is 1100...full system....high flow cats, etc. probably get a down pipe too...sooo around $2000...

 

If you dont have emissions tests in your state id go with a test pipe. That will be where your real performance gain is as far as exhuast systems go.