BMW 3-Series (E90 E92) Forum - View Single Post

Josh49 · 06-01-2006, 07:56 AM

Blow-off valves do not just exist for the sound effects. They have a real purpose, and the sound effect is a result. The purpose of a blow-off valve is to relieve excess turbo pressure that results from reducing the throttle rapidly under boost conditions. If this excess high pressure is not released, it will try to release itselft, back through the turbo (causing the turbo to stop). Then when the throttle is applied again, the turbo needs to re-spool. Having the blow-off valve can save the life of your turbo, and its response..

(Had an A4 1.8Turbo before this car)

06-01-2006, 07:56 AM	#5
Josh49 Major General 252 Rep 6,664 Posts Drives: E90 325xi Join Date: Jan 2006 Location: Boston, MA iTrader: (33)	Blow-off valves do not just exist for the sound effects. They have a real purpose, and the sound effect is a result. The purpose of a blow-off valve is to relieve excess turbo pressure that results from reducing the throttle rapidly under boost conditions. If this excess high pressure is not released, it will try to release itselft, back through the turbo (causing the turbo to stop). Then when the throttle is applied again, the turbo needs to re-spool. Having the blow-off valve can save the life of your turbo, and its response.. (Had an A4 1.8Turbo before this car) __________________ E90 325XI, MYSTIC BLUE ON BLACK/ALUM, STEP, NAV, PDC, CWP, XENON, SIRIUS, ALARM, MUD GUARDS, CLEARBRA, CHROME GRILLS AND TIPS, VALENTINE 1 (HARDWIRED), HO CERAMIC 40%, 161'S, REAR FOG MOD, LUX 4.0, BLACKLINES, OEM PEDALS, MTEC FOGS, GRUPPE-M REP INTAKE. 156'S AND RUBBER MATS FOR THE WINTER.
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