are all these valves one in the same?

if so, i saw an oem replacement for around 30$ (under the title bypass)

i want a little more of a whistle or purge, not too much but i guess so people can hear the turbo somewhat but not obnoxiously...

any tips?

 

OK...
One more time.

Bypass Valve = Diverter Valve

A blowoff valve is different from a bypass valve or diverter valve. Audi turbo systems require BPV's or DV's not BOV's.

Which OE replacement did you see?

 

Please do a search on this kind of question. It is a question that has been exhausted beyond exhaustion.

Since you are new here, you should have gone here first:
START HERE!

 

I swear man, you are a machine!! You've already done 100 posts today!!

 

I told you... I have no life!

Actually, I'm home today with a fever...

I was supposed to be on a day trip to NY city, but my core temperature said "NO!" [:@]

 

The main difference between different bypass valves is the amount of force it takes to depress the spring that reroutes the boost pressure back to the intake.

 

so do they do the same thing?

sorry i thought to search only right after i pressed ok to post the topic...

i saw the OE bypass valve that was for the newer cars with a 14.4lb limit, which was being sold as an upgrade to the older a4 bypass valves...

now would a new bypass valve give me that more whistle and purge im looking for? or would i need more boost for that from say a chip?

 

Not sure about the whistle, but the factory valve releases sooner than the uprgrades do. Essentially, it dumps the extra boost when you shift gears or let off the accelerator or when the computer sees the RPM reach the spec limit. A chip will change that, but if you leave the factory by-pass valve on there it will still release at the same pressure regardless of which chip or turbo you have. I'm not sure where the factory valve pops, but if you can delay when that happens you can maintain your boost longer.

 

I'm not sure if you're referring to the "whine" of the turbos when they spool up or the "psshhhht" sound of a BOV. If you want to hear more of the turbo, it won't matter what valve you add.

 

Yeah, when I replaced the valve it made no difference. When I got it chipped it did, and the K-04 sounds different than the K-03 for sure. I guess you could modify the intake air box if you really want the spool up to sound louder.