I was surging, I had compressor surge, which is basically compressor stall. When off the gas, not enough air escaped through the bpv and has to go back out the turbo comp housing

 

well let us know if it solves anything bc if it does ill move to one. but does it only surge from the next gear pull after makin boost of teh first gear pull with no surgin?

 

Whoops I meant to say, I wasnt surging**, It wasnt like suring power at wot, I know what your talking about cause my ko4 used to do that, thats usually wastegate frequency valve related. This was different

 

ok..ok..hold on! now..don't get me wrong.. i'm not a "ricer-boy"..but i respect people that decide to customize their cars..a person's car should reflect his on personality! so..if someone want's to put a BOV on their car..don't be talking ****..i'm the kind of person that likes to get noticed when i walk into the room..and i'm considering a BOV-setup on my S4..i like the way it sounds..and i like getting noticed! BESIDES..IT DRIVES THE GIRLS CRAZY!

 

Im thinking of running a hybrid dv/bov. I could care less if people say its ricer or not.

 

IMO a bov on stock motronic ecu is kinda lame. Why would you want to lack performance, and possibly bore wash your motor, just to get a "cool" sound. I'd rather have a bpv, but I dont run an inlet on my turbo, and my ecu permits me to use a bov.

Another thing to remember, I was running rich for about 14 months, and after a compression check about 2 months ago, My compression was about 140psi which is a very pathetic number considering my motor only had 85k mi on it. Mainer on here has 205k mi on his car and when we compression checked it it was 160 across the board... Just showing you that bore wash is a very serious issue. another 6 months of that and I'd need a rebuild

 

ya im in the same boat with the bore wash right now. my k04 ran rich and now my t3/t4 has been runin rich im hookin it up to a wideband this week to get it tuned right in that area

 

Interesting article here for audi's with BOV's..

http://forums.audiworld.com/s4/msgs/971091.phtml

 

The article is good but it misses a couple things.

A bov is not open at idle. If it was than the dbc audis running them would not idle. The air is metered by the maf, and then it escapes the system, and since the dbc cars have no map sensor, the idle would be terrible. This is the same thing as blowing a charge pipe for you dbc people. the idle is really crappy.

The other thing is when lifting off the gas, the air in the intake tract is metered and expected to go into combustion so that equivalent amt of fuel is injected by the ecu. However when lifting off the gas, the metered air leaves the intake tract and the ecu doesnt know, so the proper amot of fuel will go into the combustion chamber, but not enough air will causing a rich mix.

I dont see why cars with a map would have a problem running a bov if the maf was unplugged

 

i run my dv open with no maf and idle is great but as for the mixture i dont know yet im a dbw