I've had the Forge DV flutter since it was installed several months ago. I search this forum and found several members had the same issue. So, I decided I could live with it.

However, I've become tired of the flutter and have been doing some more searching for an answer and finally found this info from Forge. However, the thread is a couple of years old.

Is this still relevant? Is everyone who is running this DV in the OEM position experiencing flutter? Is (a) everyone, (b) some, (c) a few, running the Forge DV in the reverse orientation as suggested by Forge?

I did flip mine today. Seemed to be less flutter. Time will tell. Car also seemed a bit slower. Could have been the heat or my imagination.

In any case, what is the latest scoop on the Forge DV flutter?

 

Which Forge DV do you have?

 

i think he have the regular dv not the rs

 

Yeah, I looked at the link in the original post and it shows pics of the Forge Evo 15 DV, which Mike at Forge suggests be run in the reverse position to diminish flutter. Wierd, huh?

 

Hey, how much peak boost are you running? Is this for a low boost DD application?

 

Please check out this thread:

https://www.evolutionm.net/forums/sh...d.php?t=209640

 

Looks almost exactly like this.

Do I simply need to upgrade to the RS model? Or should I get an OEM IX valve? Or simply run the FMEVO15 in reverse orientation?

In fact, the only valve currently listed on the Forge web site for EVO VIII is the RS. Has the non-adjustable valve been discontinued?

I'm running ACN91, so I'm stuck at low boost ~21psi tapering to ~19psi. Daily driver only - no strip, no track, no auto-X.

 

Mike,
I read that whole thread, but found nothing related to my question. Is running the FMEVO15 in reverse orientation still considered to be a 'fix' for Forge DV flutter?
Thanks,
Jim

 

Even though that forge bov is nicely made... i could not find anything to help fix that fluttering issue. I put different combination of springs/shims, flipped it, reversed it... nothing helped. I drove it on the track and even my passengers wondered what the hell was going on with my car, the fluttering would jerk the car with every almost shift. My wife called it the "raptor sound". I finally replaced it with the APS bov and it's pretty much problem free.

Just to be clear, this was with the older style Forge bov shown here:

 

Reversing the valve may or may not help to minimize the fluttering effect, however, it will always be present to an extent with ANY aftermarket valve that effectively seals of each chamber within itself.

Valves with brass pistons that don't use o-rings, effectively have a "controlled leak" inside of itself, (APS for example) but that is why it won't appear to flutter.

The reason the OEM valves don't flutter is because of the pressure equalizing channel up the back side of the valve. Unfortunately a feature not easily incorporated into aftermarket billet designs.

 

Mike,
Does the FMEVO15 DV valve work equally well in either orientation? Even though my flutter is now gone (I think) by reversing the valve, am I potentially causing some other problem(s)? Am I diminishing the car's performance in anyway? Would I be better served by simply upgrading to the RS model?
Thanks,
Jim

 

Though reversing the valve may help to minimize the fluttering effect it will not alter any other aspects of the valve's operation.

Though this particular one can, not all stock nor aftermarket valves can be reversed, so I am not suggesting to everyone that they start reversing any and all valves.

Our RS, will operate in a very similar manner to the Evo15 and can still flutter under some conditions.

 

i was just about to pick one of these dvs up since the rs is on back order at most vendors and the evo15 is pretty cheap

 

Get the new Samco Sport.

 

i dont mean to hijack the thread but never heard of the samco sport you mind pm ing me a link or something thanks