Greddy Blow Off Valves

Greddy Blow Off Valves

What exactly is A BOV, What Does It Do, And Do I Need One?

There are many names for Greddy Blow Off Valves (BOVs): they're sometimes referred to as compressor bypass valves, air by-pass valves, or bypass valves. Normally, their objective would be to release stress from the intake of your turbocharged auto immediately after you let off the gas. This release of air creates the renowned "psshh" sound turbo cars are so frequently associated with. Bypass valves (BPVs) do the same factor, however they recirculate the released air back into the intake.

Why would you want a BOV? - BOVs protect against something called compressor surge, which can be when the pressure within the intake soon after you let off the gas sends an air wave back for the turbo, which can damage it more than time.
Usually do not let this make you assume you certainly will need one particular, nonetheless. Most turbo automobiles, including the Subaru Impreza WRX I will use within this example, have a stock bypass valve that's created for the levels of increase the car or truck is operating typically which will work perfectly. The only reason you would choose to upgrade to an aftermarket BOV is if you wish to run pretty a little extra increase than stock (20psi on the WRX). At this point, the compressor surge is often higher than the stock BPV can manage.

Troubles: There is certainly a single specific problem that aftermarket BOVs can create. The air that they release has already been measured by the mass air sensor, so when this air is gone immediately after the BOV blows off, the ECU will likely be injecting the incorrect quantity of fuel, causing the engine to run rich for a second. This could damage the catalytic converter just after time. This can not be fixed with engine management.