I have a crushed 1G DSM BOV installed by a shop, and the drivability sucks. It has great throttle response and holds boost, but it stalls when starting and stopping in 1st and surges when lifting off partial throttle. I assume it was crushed too much or was defective and could only hold boost if it was overcrushed.

 

I like how your bov looks nice. when i get pictures of mine i show them to you. i have two hks ssq forged right next to each other. i also run them with ems logs. they hold to about 32psi they have held good tuned at 19psi. you have to hear the way they sound though people say they can hear me almost a mile away.

 

I got a recirculating one. Actually, the recirculating one and VTA are not the same valve. Here's what the VTA looks like:

 

Any other opinions?

 

The recirculate is also VTA.

 

Our recirculating valve IS NOT to be used in atmospheric configurations.

A Recirculating valve uses a single piston and would be open under any amount of vacuum if vented to the atmosphere creating a significant loss of metered air at idle creating serious driveability issues.



Our atmospheric valves are design to be used solely as atmospheric valves. They utilize dual counter balanced pistons to prevent the loss of metered air at idle while still allowing for atmospheric operation at throttle lift.

At idle/vacuum, the main piston will be pulled open, however, the secondary piston will remain closed keeping the system in a closed-loop configuration. Under pressure, both piston will be closed to maintain a proper seal, and at throttle lift, both pistons will be forced open to relieve the residual pressure.



Unfortunately, the dual pistons cannot be seen in this photograph, but I am currently in the process of creating an "animated" picture to show how they operate.

 

I have the Forge recirculting bov and it's pretty good. Thanks to some great customer service, got to play around with the spring and shim kit and got it setup to how I want it and holds boost perfectly. I don't think you could go wrong with that setup. It's a very nicely made bov.

 

Sorry I was referring to using speed density (only reason to really use a VTA) and it doesn't matter which BOV since you are not metering air.

 

The one pictureds is for a 1g flange correct? If not will it bolt on to a 1g flange? I was use to seeing the one that bolts to the stock piping and mas pipe. This one looks a lot better

 

yes it is made for the 1g flange.

 

scott,
I have the forge. seems to hold boost real well, but it is a pain to set up. 4 springs to pick from and 3 shims make for a TON of combinations, none seem to work well with all cars. I have not been able to get rid of the "flutter" when driving on boost and slowly letting off the gas. car seems to stutter. sound is cool and bling factor is there. if you can get used to the stutter or your car doesn't get it, it is a good piece.
I had the 1g piece on my 98 eclipse and loved it. held to 18 psi steady with NO leak and when it released, was solid, no fluttering, but I never pushed past 18psi.

just my .02

good luck...

 

Hey thanks Scott

 

Yes, the valves pictured are to be bolted to !g DSM (Eclipse) flanges.

The normal evo valves are pictured below:

Atmo.


Recirc.


Because the Evo recirc. valves suffer from sometimes severe part throttle fluttering/hesitation issues, we will now be recommending that anyone interested in using an upgraded recirc. valve on an Evo uses our All-New Type RS Valve.

We will still manufacture and offer the standard Evo recirc. valve, but because of it's sometimes less than desireable driveability, we will not promote it's use for this application.

(Not having anything to do with the Greddy RS valve. Ours is named after our two in-house engineers Ray and Steve.)

The Type RS valve is fully modular in it's design and can be setup to be used either as a recirc. valve or an atmospheric valve. It uses interchangeable bottom and side ports (25mm, 34mm) as well as internal components to be used on numerous applications.

As a recirculating valve, it has cured any and all part-throttle issues previously seen on the standard Evo valve recirc. valve, while also being able to be used as a vent-to-atmosphere valve if desired.

I have used this valve for roughly 4 months on my '05 GSR as both an atmospheric and a recirc. valve with absolutely no issues at all. Works in California has successfully used this valve on their cars, as well as having been extensively tested on many VW and Audi applications.

The valve uses a conical, progressive rate spring that is adjustable from 7-34 PSI, and incorporates a ratchet type top mounted adjustment knob to precisely tune the valve to any individual's needs.

The internal bore of the valve is 50mm and the discharge port/horn has a 34mm opening to allow for maximum airflow regardless of the application. (Larger 50mm inlet ports will be available soon to be fitted with hoses or welded to intercooler piping.)

When used as an atmospheric valve, our innovative dual counterbalanced pistons are used to prevent the loss of metered air at idle/vacuum while still allowing for atmospheric operation at throttle lift.

The valve is a little larger in size than other valve but also has a side-mounted swiveling vacuum connection to aid in it's fitment into tighter spaces.

We will also soon be able to offer aluminum and stainless weld-on adapters for this and other valves so that they can more easily be incorporated onto custom setups.

Again, for Evo recirc. applications, this will be the valve we will be recommending as it offers the best flow, response, and maintains 100% OEM drivability.

Let me know if anyone has any other questions.

Atmo.


Recirc.

 

Looking good .

 

Check your PM's!