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.
BV50 and Q/QR BOV Spring Pressure Chart
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USE IF VACUUM AT IDLE IS BETWEEN:
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SPRING COLOR (UP TO 1/15/2012)
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SPRING COLOR (1/16/2012 AND ON)
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* The BV50 and the Q/QR use the same springs. The spring is a bit more compressed in the BV50 which is why the spring rating is one PSI higher.
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* The supercharger spring is specifically for supercharged cars only. If you have a quick spooling turbo it can actually push the valve open briefly before the charge gets to the maniforld; dumping boost.
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* TiAL BOV's need a 1/4" inner diameter DIRECT source to the manifold. Smaller lines and T's can cause delays in response time.
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* SPRING PRESSURES HAVE NOTHING TO DO WITH BOOST; ONLY VACUUM.
