BOV flutter

[Civib2]

i swapped my hks standard for a blitz bov, and it flutters like crazy under all boost not only at certain times. Does anyone know how to get rid of this?

 

[99GSX Swede]

Sounds like the spring tension is too loose. Is it fluttering while boosting or as you let off the gas?

 

[Civib2]

it does it every time i hit boost and let off. And i tightend it all the way and it still did it and i unscrewed it to the softest and it still does it. It use to be on my buddys evo and it sounded great but then again hes running 23psi and im at 5 right now

 

[99GSX Swede]

Why are you running 5 psi? Maybe the BOV is designed to run under 10. Just a thought. The BOV I have is designed for 10 + because of the spring.

 

[Civib2]

im running 5psi cause i have a high compression motor and i dont want to blow it up i get my emanage next week then im going to run 8psi tuned hoping for 230ish whp

 

[BigRand]

im running 5psi cause i have a high compression motor and i dont want to blow it up i get my emanage next week then im going to run 8psi tuned hoping for 230ish whp

I'd say just tough it out till you get your emange, as long as your still building boost, and the boost pressure isn't coming back on the turbo fins you should be good to go for a week, if you have problems after running 8psi then you need to check the spring.

 

[Piranha451]

My Blitz does the same thing when I let off mid to heavy throttle. My car has a stock GS-T engine. I'm sorry I don't know what is causing it, but just letting you know that it is happening to other Blitz BOVs

 

[gsx951]

At your boost levels, the 1G cbv is the hot set up.

 

[Civib2]

im just worried maybe that the spring is to stong in there and is not releasing all the air fast enough and causing compressor surge so i think im going to cut the spring a liittle bit for the mean time as long as it doesnt leak then when i boost more i will buy another spring its like 10$

 

[selmerguy]

well let me tell you a story. I have my egr blocked however i still ran a vacuum line to the thing to make it look legal. well i also tapped that line for the vacuum for my bov. so the other day i changed it and ran a line direct from my intake to my bov. it mad a huge difference in the sound and the speed at which it opens up. so you this it might help

 

[Civib2]

the vacum line its using is a direct one to the intake manifold

 

[Civib2]

okay does anybody know what bov sounds like a normal bov on our nt/wturbo cars only running under 10psi. I just want it to sound like a psssh, no fluttering no dumping no double crap just normal

 

[Turbo Shogun]

I have a friend with an '89 Starion running stock boost (somewhere around 7 PSi or thereabouts) who got a knockoff Greddy Type-S BOV, and it sounds like absolute piss. No flutter, no whistle or whoosh, just a meek little squeak. I'm running an authentic Greddy Type-S and I get a little flutter when the car's cold. Once it warms up, I get a "whoosh/whistle" type sound. It's very loud, and I have it recirculated into the intake.

I don't know how the Blitz BOV works, but if it came off an Evo running 23 PSi of boost, it's probably not going to work on something that's running 5 PSi ... My advice is to either buy another BOV or a spring (if you can do that). Do NOT cut the spring for the diaphragm ...

Does the Blitz BOV have another, smaller nipple besides the one for vacuum that actuates it?

 

[BigRand]

okay does anybody know what bov sounds like a normal bov on our nt/wturbo cars only running under 10psi. I just want it to sound like a psssh, no fluttering no dumping no double crap just normal

HKS ssq is what you want, I've also heard good things about the turbo XS RFL (also stands for really f**king loud).
Also you can be like me and go with a greddy type S with an HKS incert on the horn so you can get different sounds.

 

[Civib2]

I put a RFL on my girlfriends A4 and it doesnt sound that loud at all, but i do like the sound it gives off a nice solid pssh, well i cut the spring and got it to where i belive there is no compressor surge. But its so weird this flutter i even tried putting her stock bypass valve on and it sounded the same as the blitz did before i modified it just a huge flutter, i think case and point is low boost its not going to sound good.

 

[GSGoinFast]

At your boost levels, the 1G cbv is the hot set up.

agreed. i wish it had a nice whistle sound to it but the strait out whoosh is very nice too. plus theres no fluttering, just the whoosh is softer at lower boost

 

[selmerguy]

if you run a tee in the vacuum line like for the egr and the bov the valve will open up slower and make a more whistle like sound.

 

[TheBoz]

For all you guys, where did you tap the intake manifold for the BOV. Did you Drill a new hole in the manifold and use that, or an existing line?

 

[Civib2]

i just got a tee and tapped into one of the vac lines on the back of the manifold

 

[DSMcrazy3]

For all you guys, where did you tap the intake manifold for the BOV. Did you Drill a new hole in the manifold and use that, or an existing line?

No no no drilling.. I, and many people that use the Intake manifold, tap the break booster line. It's the one farthest to the right when looking at the engine I believe. That's what I used.

Josh