The TiAL Q is the first revision of the original TiAL BOV. The Q bolts up to any standard TiAL flange, no re-welding. This is the highest flowing BOV on the market. It's offered with a variety of springs for different vacuum levels and a special spring specifically for supercharged vehicles.
Included with every TiAL Q BOV:
How to Choose the Spring size:
Engine Vacuum Reading at idle Use Spring:
Between: - 22 and -23 in/Hg - 12 Psi (-24 in/Hg )
Between: -18 and -21 in/Hg - 11 Psi (-22 in/Hg )
Between: - 14 and -17 in/Hg - 9 Psi (-18 in/Hg )
Between: -10 and -13 in/Hg - 7 Psi (-14 in/Hg )