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Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Community Media
Tial Q Blow Off Valve 11 Psi Spring Black (Part Number: )
Tial Q Blow Off Valve 11 Psi Spring Black
Read 3 Reviews | 9 Q&As
Part # Q.11BK
msrp: $314.16

In stock! Ships same day
Universal part

Features & Product Details

RallySport Direct is proud to carry some of the best aftermarket turbocharged components brought to you by Tial.

On this page, you are looking at the Tial Q Blow Off Valve. This blow-off valve delivers in performance for vehicles from mid to high horsepower levels to relieve boost.

Here are the details:

  • Flows 60% more than the original design
  • One of the best performing valves on the market
  • Retains the same flange as the original version
  • Black finish
  • Includes V-band clamp, weld-on flange, and vacuum banjo fittings
  • 11 psi spring
  • The spring pressure in the valve does not correlate with the amount of boost pressure you want to run. The size spring you need is determined by your engine vacuum at idle. Please refer to the charge below to select the right pressure for you.


    ENGINE VACUUM READING SPRING COLOR SPRING RATE -22 and -23 in/Hg Brown -12 PSI (-24 in/Hg) -20 and -21 in/Hg Yellow -11 PSI (-22 in/Hg) -16 and -19 in/Hg Un-painted -10 PSI (-20 in/Hg) -12 and -15 in/Hg White -8 PSI (-16 in/Hg) -8 and -11 in/Hg Black -6 PSI (-12 in/Hg)


    Brand: Tial
    Adjustable: No
    Color: Black
    Design: Diaphragm
    OEM Replacement: No
    QTY: 1
    Valve Type: Atmospheric
    Includes Gasket(s): No
    Mfgr. Warranty: Limited Lifetime Warranty
    Condition: New Product
    Return Policy:

    RallySport Guarantee - 30 Days

    Items that are covered under the RallySport Guarantee offer a 30 day no questions asked return policy.

    RallySport Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.

    The RallySport Guarantee does not apply to products that have been modified, damaged, misused or abused. All returns require an RMA (Return Merchandise Authorization) Number, and freight charges are strictly non-refundable. For more information regarding our freight refund policy, please refer to our return policy page found HERE.



    3 Reviews
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    Customer Photos and Videos
    Tial Q Blow Off Valve 11 Psi Spring Black ( Part Number: Q.11BK)
    1 of 1 people found the following review helpful
    Best Service!! 3 years ago
    Make sure you check that it comes with an O-ring for where the flange and bov meets. You wont notice that it leaks until you do a boost leak down test. Mine didnt come with one so i called RSD and they sent me one. Bov is great and RSD is awesome. Will always buy from them. Easy install, fits perfect.
    Was this review helpful?
    Tial BOV 11 psi spring  3 years ago
    The BOV is a welcomed addition under the hood, it works great and installed quickly
    Was this review helpful?
    Top Quality! 8 years ago
    Decided to go with a new blow off valve and since Tial makes great products thought I would try this out. Works 100% awesome, and makes a very distinct sound!
    Was this review helpful?


    • Q: Tial bov on Process West TMIC (with adapter)  Jorge Padilla 5 months ago

      Tial bov on Process West TMIC (with adapter) Will this work for a 2011 WRX? Does it include the block off plate?
      • 0 of 0 people found the following answer helpful

        A:  Although we can't officially confirm fitment for your 11 WRX, you should be fine as long as you use an adapter that allows the BOV to clear the hood. This does not include a block off plate.

        Marcus E. @ RallySport Direct 5 months ago  
        Was this answer helpful?
    • Q: 2015 base wrx bov  Penboy1 year ago

      Would this bov need any modification to my stock 2015 base wrx?
    • Q: 2016 wrx base model  808subies3 years ago

      Hello just wondering what I would need to make this work on my base model 2016 wrx and do you carry it? Thanks
    • Q: in/Hg at different altitudes.  uriahbuffalo092603 years ago

      Hello! I noticed different springs correlate to different vacuum readings. I live in Tahoe above 6200 ft, and my vac pressure is around 18.5 in/hg. However when I take a trip down near sea level my vac pressure changes all the way to around 22.5 in/Hg. I am guessing I would want the spring rated for my pressure at sea level? Thanks.
      • 0 of 0 people found the following answer helpful

        A:  Base your spring upon where you do most your driving. Readings will always fluctuate based upon elevation but they shouldn't change enough to drastically change performance.

        Trevor C. @ RallySport Direct 3 years ago  
        Was this answer helpful?
    • Q: Tial Q BOV  Bendik3 years ago

      What more do I need for an install on stock Mitsubishi EVO 8?

    This Part Fits

    Universal Product
    This item is non application specific.
    Please verify compatibility before purchase. May require some modification for proper installation.