Forge Vented Diverter Valve, 08-10 Cobalt SS / HHR SS / Cadillac / Regal 2.0 Turbo Engines

Model Number: 243191-VENTED

The OEM diverter is mounted on the turbo, and is built with a rubber seal, and a spring. Once vacuum from the intake manifold pulls on the diverter, the valve will open and release air from the turbo. Over time, the rubber seal becomes brittle and wont seal as well. The spring can become weaker as well, which will cause the diverter to not seal as well, and you'll loose boost pressure. Especially at higher boost pressures!

This is the fix for this. This made from scratch aluminum diverter is made in Great Britain, and is made to handle high boost pressures. It has brand new seals, aluminum piston and has variable springs for different boost pressures. This will hold your higher boost pressures and help restore some of the boost pressure that may have been leaking out.

This diverter is different than the standard one Forge Diverter valve, because it does not release compressed air back to the turbo. This valve is a vented style that releases pressurized air to atmosphere. This will cause a cool whoosh noise, however, because GM cars are mass air flow sensor cars, air is metered by the air flow sensor, and there is supposed to be no release of air after the meter. So, if you install this vented valve on a mass air flow sensor car, the car will run rich after each time the valve opens. The best way to get around this, is stick with a non vented valve if you dont care about sound, or if you want the whoosh noise its best to get a tune installed on your pcm that can accomodate for a vented atmosphere valve. Most tuners can cut back on some of the fuel after each shift to reduce the effect of having a vented diverter valve and power loss after shifts.

This Forge diverter valve fits the following vehicles:

  • 2005-2010 Cobalt Turbo
  • 2008-2010 Chevrolet HHR Turbo
  • 2.0 Buick Regal Turbo
  • 2008-2010 Pontiac Solstice
  • 2008-2010 Saturn Sky Redline
  • Cadillac CTS/CT6/XT4/ATS with 2.0 turbo engine
  • $157.99
    Forge Vented Diverter Valve, 08-10 Cobalt SS / HHR SS / Cadillac / Regal 2.0 Turbo Engines, Turbo Accessories: Store Name
    • Justin
      When tuning for this, can i just tune the PCM or do i also have to re-locate my MAF sensor to my lower charge pipe like you would for a traditional BOV?
      1 Answer
      • Modern Performance

        You can have a tune written that will accomodate the vented blow off valve, or re-locate the maf sensor.
    • Michael
      If I'm running with the gm tune will it still throw a p0101 code?
      1 Answer
      • customer service rep

        The vented Forge valve should only be run with a custom tune. Because if you use this on your Cobalt without a custom tune, you'll have sluggish performance after each gear change, and a check engine light.
    • James
      If I already have a Forge BPV and I'm assuming my Cobalt is tuned for it on my Trifecta tune, would this be able to work without a retune?
      1 Answer
      • Customer Service Rep

        As long as you are 100% sure you have a tune that accommodates for a vented diverter valve, then sure, you can install this. But if you install a vented diverter on a car with a stock tune, or a tune that isn't set up for it, and your car will run super rich and you'll lose a lot of power.
    • Jay
      What's the difference between this & the non vented modern dv?
      1 Answer
      • Customer Service Rep

        For cars made by GM (Cobalt, HHR, Regal, etc) and Ford (Focus, Fusion, etc) that have mass air flow sensors, the pcm measures how much air is coming through the sensor and adjusts the fuel mixture based on that information. Once you have a mass air flow car and a vented to atmosphere blow off valve, you are releasing air AFTER the pcm has measured it, and the pcm has no idea the pressurized air has been released. It then puts out a certain amount of fuel that is not accurate, and it makes the car run very rich and poorly. Now, some PCM tunes can make the car run better after the blow off valve opens, but its not perfect. Therefore, we recommend if you do not have a custom tune and you have a mass air flow car to stick to the NON VENTED. If you have a custom tune specifically made for vented blow off valves, then you can get the vented blow off valves.
    • Jonathan
      I'm assuming that the spring color denotes different PSI ratings. What PSI ratings do each of the springs represent?
      1 Answer
      • Customer Service Rep

        Details on springs from Forge: Valve Spring Colour Coding: The weakest spring is GREEN, followed by YELLOW, BLUE, and RED which is the strongest. Depepending on the supplied original fitment, this represents an increase of 25%, 50%, 75%, and 100% respectively.
        *The above should only be considered as a guideline*
    • Jonathan
      Is there a recommended spring (Green - 25%, Yellow - 50%, Blue - 75%, or Red - 100%) do you recommend for a standard trifecta tune? If not, do you find that there is a typical preference?
      1 Answer
      • Customer Service Rep

        The way this valve is assembled, its perfect out the box to install on a LNF running 20-23 psi. If after installing you have any leaks or high pitched whistling noise with loss of power, then you should go to the next higher spring. Do not change the spring unless you hear the whistling noise or have boost that is building up and then bleeding off, building up and bleeding off.
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