Good to see aftermarket BOV’s being exposed as the marketing hype they are! At low boost levels there is no performance/reliability loss from not using one, the only reason manufacturers fit them is to eliminate the noise of compressor surge.
That’s not to say I don’t like the sound of a BOV (I prefer a subtler sound though, not a ricey “look at me” sound), I just can’t understand paying so much for no real gain

Thats what I meant. The feedback from the closed plates onto the turbo may make a pretty sound, but it hurts the turbo plenty...;) On WRCs the turbos are always made out of titanium (also the Makinnen Lancer and the Extreme Impreza have titanium turbines), so they can withstand this abuse, but stock turbos on TII or FDs ? I dont think this is a good idea.....

Man I am glad RotaryMiata knew, I was expecting to buy some expensive Japanese imported BOV, but all I have to do is take mine off. I prefer the sound of the "back-pedal" over the whistle or psssh! over a BOV.

I hope you like and can afford rebuilding your turbo every few months! :D



-Ted

yeah thats going to suck

But seriously is it THAT bad for your turbocharger (or should I say mine)?

Take to a reputable turbo rebuild shop...



-Ted

I might put my old stock turbo back on and try this out just to see...

Don't run boost without a BOV! Compressor surge is a bad thing for people that can't afford to buy now turbos all of the time. That "cool" sound you hear is your turbines being blown backwards, in my friend's case, they were blown off his 3K turbo. Buy a $200 BOV!

Yes, compressor surge is bad folks, mmmkay? Also there is a performance benefit... if you don't blow off the pressure and you stall the turbine, it has to spool again when you get into the next gear, because it's not spinning as hard. BTW, another valid reason to replace the stock BOV is that they often leak at increased boost levels. Or even at normal levels once they start to get old.

the dolphin sound from tokyo extreme racer is an aftermarket wastegate.

I have the stock one and it sounds like NOTHING.. it's so friggin' quiet.. stupid "average joe" drivers like cars quiet..

ROFLMAO

:)

i think this does the fluttering noise,
http://www.takakaira.com/php/template.php3?id=702&cat=2

There is nothing to be gained by removing a BOV. Its there for a reason. As mentioned numerous times before, it eliminates compressor surge, also known as "boost spike". Not only does it keep your turbo from lagging as much, it also prevents more "back pressure" in the turbo, increasing turbo longevity. And it has that kick ass sound, too. Keep it on.

WRC cars have a system, I don't know what the name is, misfiring system or something, that puts fuel into the exhaust right by the turbine to spin the turbine up as the driver shifts. It beats the hell out of the turbo though. :)

Well, guys I guess I'm in the minority here. My car gives me that flutter sound and I have a Greddy BOV on!!! Could the spring be too tight? What does tightening or loosening the spring do to the BOV? How do I know if I got it set properly?

Thanks,

-M

I've got a Greddy type-s and it goes "tckssssssseeeewwww" (sort of) and it is LAF, if I rev the engine from under the hood it almost hurts my ears, you can turn it down so it's a little quieter

Fluttering sounds from BOV usually means its NOT adjusted properly. What your hearing is the BOV piston oscilating up and down relieving boost pressure. This oscilation also is SURGE (pressure waves bouncing back and forth in your intake track from throttle plate to compressor wheel). NOT GOOD, adjust it!!!!! Also, alot of the noises people hear in racing videos and TV (World Rally etc.) are sequentual (sp?) trannys and gear whine from straight cut gears. A lot of times when gas is let off the back lash in the straight cut gears makes a what could be a BOV sound but isn't. Just for the record, I like whistle BOV.

~Mike.......