Description

Item Code: TIALBOVSPRING
Brand: TiAL

TiAL® Blow Off Valve Springs are designed to work in all of their blow off valve models including the BV 50mm, Alpha Q, Q, QR, and QRJ valves. You should select the BOV spring pressure rating based on your engine’s vacuum reading at idle, once the engine has reached operating temperature. However, the pressure ratings will vary depending on the model blow off valve you have, so please reference the chart below to ensure you are purchasing the correct spring for your application. The green spring should only be used on supercharged vehicles, on quick spooling turbos the valve can actually open briefly before raching the manifold, dumping the boost. TiAL® Blow Off Valves need a 1/4″ inner diameter source that is direct to the manifold, smaller lines and additional T-fittings can cause delays in response time.

BV 50mm Spring Rates
Spring Color Spring Rate Use for Engine Vacuum Reading
Green 3 psi (0.21 bar) SUPERCHARGER ONLY
Black 7 psi (0.48 bar) -8 to -13 inHg
White 9 psi (0.62 bar) -14 to -17 inHg
Plain 11 psi (0.76 bar) -18 to -20 inHg
Yellow 12 psi (0.83 bar) -21 to -23 inHg
Alpha Q Spring Rates
Spring Color Spring Rate Use for Engine Vacuum Reading
Green 3 psi (0.21 bar) SUPERCHARGER ONLY
Black 7 psi (0.48 bar) -10 to -13 inHg
White 9 psi (0.62 bar) -14 to -17 inHg
Plain 11 psi (0.76 bar) -18 to -21 inHg
Yellow 12 psi (0.83 bar) -22 to -23 inHg
Q and QR Spring Rates
Spring Color Spring Rate Use for Engine Vacuum Reading
Green 2 psi (0.14 bar) SUPERCHARGER ONLY
Black 6 psi (0.41 bar) -8 to -11 inHg
White 8 psi (0.55 bar) -12 to -15 inHg
Plain 10 psi (0.69 bar) -16 to -19 inHg
Yellow 11 psi (0.76 bar) -20 to -21 inHg
Brown 12 psi (0.83 bar) -22 to -23 inHg
QRJ Spring Rates
Spring Color Spring Rate Use for Engine Vacuum Reading
Pink 1.5 psi (0.10 bar) SUPERCHARGER
Green 3 psi (0.21 bar) TURBOCHARGER