I just bought a Greddy Type-S BOV and it's scaring me.

My mods are in my Signature, and I usually hit about 1.57 bar at the peak.

I put on the Type-S today and everything went smoothly, i started up my car, everything ran great, i loved the sound. Couldn't have been happier, except for a little bit of fluttiering that i figured i'd get out tomorrow.

As the night went on, I noticed that my boost gauge was moving very slowly, so i thought i might have a boost leak, which scared me. Then after driving around more, everything was fine, until on the highway, in 5th gear at WOT i hit 1.75 bar. This has never happened, and i know it shouldn't be.

Fluttering is worse than ever. Around town, and 1-3 gear, everything is great, the car seems alot faster. But on the highway, something is wrong.

What do i need to do?

Could i have installed it wrong? I used the How-To on Evomoto

Guys, please help!

 

I am not sure but it should of came with a couple different springs. Do a search but i think there is a different spring you have to put in so it doesnt release the pressure under boost and will cause you to loose the fluttering.

 

just double check your clamps. I have the same setup and mine goes to 20psi and stays there even in the higher gears

 

he's saying he's over boosting... and that he thinks that's a problem... and that the bov caused that problem. assuming this is all cuz yer bov is sealing better and keeping in all the boost that your turbo makes, then you should.... turn down yer boost? before it mighta been cuz the bov would blo open and that's why you could get away with the setup you had before. either that or port your wastegate. but that's only if you turn down boost and it still does this. that would mean your wastegate doesn't flow enough, doubt that's the problem, that only happens on stis.

as for fluttering, can someone else chime in and tell me why this occurs. i used to think it was the type of bov you had, that it was a gimmick the fluttering sounds cool so people get those bovs. recently i heard that you can make ANY bov flutter. and then i discussed it with my frend and he said that mabye the position of your bov in the line of things, whether you have it on top of ic or upper ic pipe or whatever, maybe that's what causes the fluttering. btw is fluttering bad? i recall watching a best motoring video with a guy in a silvia, his bov was fluttering like mad, like i said i used to think they just did that to make it more "cool" yeah so they were running it with no harm i'm assuming. what's the deal?

 

on that best motoring video the guy is driving a silvia with a HKS SSQ BOV, its super suquentail (wow i spelled that wrong!!) so its actually blowing off while he is driving, but it keeps blowing off with is causing it to flutter..... my buddies and i watched that video like 50 times the other night !!! You really dont want your BOV to flutter !!
Taylor

 

The fluttering under light boost is normal for the HKS SSQV...there are two valves in there...a small valve for light boost, and a large one for high boost...if you're shifting easy, you'll just hear a light fluttering blowoff, but when you're driving it hard, it blows off solid and LOUD!!!

 

My HKS SSQV was acting strange. It fluttered at normal driving like it should but at WOT it would fluter twice sometimes three times then whooosh. I couldn't figure it out and went back to the 1G.

 

uhm... it only blew off when he let off the gas, which was very often and you could tell that it was holding boost cuz when he made quick shifts on straightaways it would not flutter at all. only when he let off the gas for a while in turn to brake and clutch and stuff.

 

how does this sound?

Could it be that my old BOV was leaking boost and my boost was turned up higher to compensate for the leak?

I turned down my boost and i was still hitting between 1.30-1.50. It is only when i floor it in 5th gear that my boost was going insane.

 

you should really tune the bov and add the vacuum lines to it (like road race engineering does) if you look CAREFULLY on all the threads that discuss the type s and bovs in general you'll see this is where the type s has something that no one else does (the vacuum line option, er... at least i think no one else has this option, not forge, maybe hks) you can't possibly have a perfect working bov on a mechanical spring alone, i mean... all the spring does is push in one direcction and this is a system that requires you to be pushing in one direction sometimes and another direction another time. anyway, if you carefully look at the other threads you'll notice that no one that is running the type s with the vac lines has any problems. this means it works. the so called one spring mod still has some weird thing where it stays open during idle or something (even though that's not irregular or something to get that upset over, but shrugs) in order for it to work in tip top shape, install the vac lines and recirc it.

 

sorry, i should've mentioned that i am using the vac lines and i have it recirced.