what valve type are u using? 2 springs type or just one solid valve?
recirc uses just one soild valve type and it never fluttered on mine. It is only when I use VTA set up with 2 springs.

 

The forge RS recirculating valve. Don't know what type of spring is in there. I hope I can fix this fluttering.

 

I'm still having the same problem as well. If I set it tighter, it holds boost better but flutters EVERY time I let off the throttle. When I have it set looser it will flutter only when I go from full throttle to partial throttle above about 3.5k or 4k RPM's. Haven't had any real problems with holding boost except at partial throttle.

 

nice BOV..!! LOOKS good.. how good those it hold boost!!!???

 

are you running VTA?

 

Nope, I got the diverter valve. I haven't and will never run any valve VTA. I'm learning to drive around it some, but I do wonder how it will feel through a corner on a track. May even look into getting a 1G valve.

 

I never had a problem with recirc. It held up a lot of boost and no flutters. And I really like the sound of little rat .
Anyway, I just adjusted my VTA setup various ways and it fluttered on any settings. I guess that rattle snake sound at low boost is normal for VTA. There isn't any drivabilty issuses. it doesn't buck or stall.

 

Just curious but are you sourcing the same vaccuum to the bov and mbc from your mbc\manifold?

The slight flutter when let-off is okay. It's the fluttering when I'm at partial throttle\boost (15 psi) that I don't like. It will flutter as if the bov is opening and closing and if I don't let off or got WOT the car will buck. I'm going to try sourcing the vaccuum to the bov from the turbo\upper pipe instead of the manifold to see if that helps.

I tried a 1g, hks, turbo xs rfl, and now the forge RS bov. I like this valve alot and hope to get the fluttering fix\under control

 

you don't want to do that. you have to get the vaccum source from mani. Bov will open when it detects vaccum from mani. if you connect anywhere before the throttle plate, your bov will never open.

 

This is the same thing I'm getting. At partial throttle and high boost it the valve flutters--it feels like the car is shuttering. I get this feeling no matter how I set the valve. And it's the situation you describe: 15 psi partial throttle (usually above about 3500 rpm). In addition to this, when the valve is tighter, I get a flutter sound when letting off the throttle. The flutter sound when letting off the throttle doesn't do anything to the way it drives, it just sounds really annoying.

 

that is really weired. may be you guys have leak problems? I would check the line from mani to your bov. make sure, it doesn't have any leak.
recirc should work almost like stock bov. mine only slightly flutters when I relase the throttle at about 1 ~3 psi on VTA setup.

 

Thanks and sorry for the mis -statement I meant to say source the vaccuum to the MBC from the upper pipe inside of the manifold.

The question was suppose to be sourcing the same vaccuum to the bov and mbc from your mbc\manifold?

https://www.evolutionm.net/forums/sh...&postcount=138

 

Ok...well after reading most of the post in this thread, I think I have convinced myself on getting the Forge RS.

However..

I would like to run it VTA to start.. then if it doesn't like that, ill just recirc it (probably get the kit, so that shouldn't be a problem). My car is completely stock, and that would be the first "mod"... but I do plan on modding more.

What should I expect? Should this run well? How should it be set?

 

BOV mod should come later. It should be replaced if the stock bov can't hold the boost you want. stock bov is the best for stock set up. However, if you like the sound of bov, you should be fine with forge RS bov. I liked the recirc set up with my intake. It sounds little less louder than the VTA set up. The RS bov is much heavier than the stock bov. only bad thing about the recirc was that bov was kinda too close to the exhust mani. For VTA, you will be fine if you don't mind the rattle snake sound .

 

It sounds like a rattle snake? I thought everyone was saying its a nice "whoosh"?

I like the sounds when its like a drop of air.."cuussh".. not like a whistle..