I just installed the Forge Motorsports , vented to atmosphere, blow -off valve. I have to say i was very skeptical about using this type of B.O.V. But Tom @ Forge assured me it would be fine.
The kit itself is very nice and the quality is exceptinal right down to the hightly polished billet housing. I really like the large piston opening and the sound is incredible. The kit comes with nice high quality clamps and a billet plug for the intake plumbing. I have never had so many people ask me what kind of B.O.V. i am running. The price is also great, the quality is even better. I have the softest spring installed...the yellow one, and the responce is awsome. The sound is like the B.O.V. sound in Gran Tourismo 3...that woosh sound, but very loud. I love boostin by loud V-8's! If you love attention and want a quality B.O.V. @ a great price, give Tom @ Forge a call....The guys at Forge Motorsports are very knowledgable and friendly.

I want to have one thing made perfectly clear- you are having NO ISSUES venting to atmosphere?

I had a few Forge pieces on my last car, and they are top quality.

I had their recirc valve on my car, but now its a paper weight on my desk. No matter what spring configuration or orientation I tried, the partial throttle compressor surge was lethal.

I know a VTA won't do this, but I don't want to take that recirculated air away from the MAF.

i have a Forge VTA bov for sale, please let me know.

I think you would have surge with a VTA. Just my .02. My old as dist HKS SSQ surged like a ****. My Forge recircs with no surge and gets the proper readings back to the MAF.

Does anyone have a clip of the Forge? I'd love to hear what it sounds like - my pos stock BOV is leaking like a sieve.

What exactly is the partial throttle surge issue? Could it be what I'm experiencing by chance??

For those with the vibration issue:

.....in 5th gear, 80% throttle, 75 - 90mph range. I felt the car emitting a mild vibration in the pedal and when I looked down the SES light was right there staring at me. You then have to let off and it will stop.

Usually only happens around 75-80mph. But I've gotten it at 95mph too.

To me, I'm thinking it's gotta be something in the airflow since you can 'feel' a vibration or flutter via the pedal when it happens. If I don't let off, but instead push down the accelerator for more gas, it'll max out at like 10-12psi and have a god awful loud vibration sound that sounds like something is clogging the airflow. I checked my exhaust and made sure it and the O2 sensor in the midpipe was secure and it was. There's a small leak where the HF cat matches the Midpipe, but nothing major.

Any ideas?

I have a FORGE with RE-Circ and that dam thing surges no matter what spring I put in it....but when I am pucnhing the car there is no surge and it almost soundslike the greddy BOV...almost........but when at 70 or 80 and you mildly let off the gas.....man it sounds and feels sooo ugly.....I just wonder If i get the greddy BOV, will I have the same problem? Does anyone know?

I have the Forge DV (Re-Circ) as well. Can you further describe what the 'surge' is you mentioned? Is it similar to my above description?? Do you throw a SES light when this happens?

Not likely to be the same issue. Compressor surge should not throw a CEL. Go to Autozone, or a dealer, and pull the code. I bet it's a P0300. Do a search on P0300 and you'll find lots of information.

Good luck!

I've pulled the code myself - it is P0300. I'm just trying to figure out what the vibrating feel and sound is that I'm getting along with the code is.

Yeah I never threw a code with the BOV.....but the flutter sounds like SH*#+@

Here are some of my comments from another thread as well as some other thoughts.

The part throttle "surging" issue is a common occurance with any single piston or single diaphragm recirculating valve. It just happens to be severly exagerated on the Evo's.

We have even duplicated this occurance on our own Evo development car, but, it is next to impossible to eliminate it.

The "surging" IS NOT compressor surging for those of you worrying about it. It's only a driveability concern, not a reliability concern.

It is an inconsistent response from the valve at part throttle modulation that causes the MAF to have trouble figuring out what kind of input the driver is actually trying to send to the car.

The problem comes from the inconsistent pressure differential between the pressure side of the valve and the vacuum line. This inconsistent valve response come from the "hesitant" throttle input that the driver is providing, or so the car thinks.

It is virtually unavoidable. The OEM valve does not have this problem as the 3 chambers in the valve allow for more "fluidic" movement and consistent response of the valve during the transition from vacuum to positive pressure and vice versa. It is very difficult for us to duplicate the operation and design of the OEM valve. Almost impossible even.

We have tried a couple of different possible solutions to the issue, but none have worked thus far.

We are still looking into it. It is an ongoing process, but it takes time.

I'll try to keep you all up to date with the progress.

Great to finally get a real and beleiveble answer on this matter.....and I am glade to hear that it is not damaging my turbo, that is a relief. Thanks Mike and we will all be waiting for an update.

Sorry, can't read that wiggly line.

quote:

I just installed the Forge Motorsports , vented to atmosphere, blow -off valve.

I have to say i was very skeptical about using this type of B.O.V. But Tom @ Forge assured me it would be fine.

The kit itself is very nice and the quality is exceptinal right down to the hightly polished billet housing.

I really like the large piston opening and the sound is incredible.

The kit comes with nice high quality clamps and a billet plug for the intake plumbing.

I have never had so many people ask me what kind of B.O.V. i am running.

The price is also great, the quality is even better.

I have the softest spring installed...the yellow one, and the responce is awsome.

The sound is like the B.O.V. sound in Gran Tourismo 3...that woosh sound, but very loud.

I love boostin by loud V-8's! If you love attention and want a quality B.O.V. @ a great price, give Tom @ Forge a call....

The guys at Forge Motorsports are very knowledgable and friendly.