I have a greddy type s bov and before on my greddy kit it would sould normal and crisp. now that i changed my turbo set up its flutters alot. I changed the screw from soft to hard but still could not get it right. any one can help also would me changeing my turbo make a diffrence from a greddy to a garett.HIFi 60 like a sc/61.

 

try a different/better vac source

 

i try using the fpr for vac but i do have like 3 tee's on it people say use the brake booster but i dont have a fat tee that slims down to a small tee for my bov hose?

 

where else could i hook it up to other then the break booster? i have alot of tee's on for the boost controller,wastegate, Boost gauge and bov

 

you can use any line on the intake manifold. You can get a vac. manifold from golden eagle or the like if you wish.

 

I'm having the same problem but with HKS SSQ. I changed my inlet pipe size and intake and now it sounds gay...... I need help too.

 

So how many psi are your guys running? You all describe what to me is normal operation.

 

7 right now but im geting tuned for 10 everyday driving and 14 high

 

I running the greddy kit internal wg at 8psi. The normal HKS sound a high pitch woosh at heavier throttle and at light throttle a flutter. Except now Im getting a bubbley flutter sound at light throttle 1000rpm to 3000rpm. Its sounds so gay..................

 

My turbo XS RFL BOV flutters if I am at partial throttle and let off the gas slowly...

But if I let off the gas quickly the sound is really crisp...

Is the BOV fluttering when you let off the gas quickly and from WOT? If so, then I think there is a problem, maybe you are hearing compressor surge?

 

Whats WOT? And how bad is compressor surge? Is it fixable? Teach me Im new to the turbo thing.

 

i think it might be normal for bov's to flutter at lower boost levels, becuase part of how the bov works is the boost pressure itself pushing the valve open.... mine sounds like aflutter or a purr or some goofy bird ot low boost but at 16 psi it sound like a normal bov
-Toby

 

WOT=Wide open throttle. and compressor surge is when the air is going out the intake side of the turbo (backing up) It is fixable but You have to make sure you have a good vaccume source.

 

Thanks for the insight. Umm if I am getting compressor surge check to see if the intake pipe has some sort of restriction, and try find another vacuum source for BOV? Right now its running from the back of the iintake manifold. That should be sufficient enough right?

 

yes back of the intake manifold is fine

 

I think if you hook it up to the wrong vac fitting on the BOV itself (there are two on the Greddy S, one is for a recirculation something or another) it will flutter and sound like ****.

 

no i think i hook it up right there are two but ports it goes on the upper one not the lower one.