As low as 0% APR Financing
On orders over $200
100% Money Back on Select Parts

Tial Q Blow Off Valve 11 Psi Spring Blue - Universal

Manufacturer Part # Q.11B


MSRP: $308.00

In stock! Ships same day
Qualifies for free shipping!


The Tial Q valve is Tial's newest blow off valve. Improving upon their old design that has been proven for over nine years to be one of the best performing valves on the market. They were able to design this valve to flow 60% more than the original design. The Q valve uses the same flange as the original version to allow for an easy upgrade.
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: Blue
Design: Diaphragm
Includes Gasket(s): No
OEM Replacement: No
QTY: 1
Valve Type: Atmospheric

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.


This product has no user uploaded media. You can upload your photo or video of your install by posting a review. Reviews:

  • Q: Atmospheric 50/50?  CHRISti 1 year ago


    Can this bovine be adjusted to 50/50?

    • A: Unfortunately, this BOV cannot be adjusted to 50/50.

      Brady R 1 year ago
  • Q: Tial Q bov   djjefferson56e492894ea8c3b4448b45c7 2 years ago


    So I had just purched the Grimmspeed top mount intercooler and a tial Q bov and I'm just wondering if I'll need and different flange so that I can instal the bov?

    • A: You will need a flange to fit this BOV on that intercooler.

      Josh P. 2 years ago
  • Q: 2014 STI  Miguelo 2 years ago


    How do i know witch spring to use ? my sti is 14.7 psi .And how much psi it can hold? thank u

    • A: The spring you need is based on the vacuum your car pulls at idle. You will need to get a vacuum reading from an Accessport, Boost Gauge, or Factory Diagnostic Tool. After you have this measurement, refer to the provided table to see which spring would be best. This BOV does not have a specific rating for boost pressure.

      Josh P. 2 years ago
  • Q: Flange material  01_RSTI 2 years ago


    Hi, I wanted to know what material the included flange is made out of? Aluminum, mild steel or stainless. Thanks!

    • A: The flange included with this BOV is aluminum.

      Zach G. 2 years ago
  • Q: springs   rubensahagunjr90744 3 years ago


    will this bov come with the extra springs listed above or will i have to purchase separate

    • A: Springs for the Tial Blowoff Valves must be purchased separately, this unit comes with the 11 PSI spring pre-installed.

      Nick S. 3 years ago
    • A: No, This BOV will only come with the 11 PSI spring. If a different spring is needed for your setup, you will need to purchase the correct spring separately. Spring options can be found in our Blow Off Valve Springs section.

      Brady R. 3 years ago
Universal Product
This item is non application specific.
Please verify compatibility before purchase. May require some modification for proper installation.