You can search all day long, but it's time to put this to rest, I need closure.

I have stock 03 WRX, yes I'm young and dumb, and want the sound of a BOV. Serious mods in the future, so I'm thinking I might need one anyway.

Putting an aftermarket BOV Blitz or HKS SS on a stock WRX, will this cause problems.

No upgraded chips or anything. Is my car going to back fire, or run so rich as to cause problems.

Yes I know I have better things to spend my cash on, no bashing, I just need a straight answer. Thanks in advance.

 

buy a GO FAST BITS BOV. you'll have no problems with running rich and it'll be able to handle high boost mods later on in the life of the car!!!!

 

A throttle-closed blow-off valve is designed to vent any pressure build-up between the turbo (or intercooler) and the closed throttle blade. This pressure build-up occurs when the car is on boost and then the throttle is suddenly shut. To allow simple valve triggering, the BOV is opened only at high manifold vacuums (ie light loads - especially on the over-run). Manufacturers fit BOVs to reduce the turbo surge noise that otherwise occurs when the throttle is suddenly snapped shut while the turbo is still spinning, while in some applications they can also help keep the turbo on boost during gearchanges. However, the main reason that most people change the factory valve to an aftermarket unit is to get a "pssssht" noise when backing off or changing gears. This noise occurs because the valve is configured to dump air to the atmosphere, rather than feeding it back to the intake of the turbo, as all factory blow-off valves do. It should be noted that if a relatively normal sized turbo is being used and the factory valve isn't leaking under boost, fitting an aftermarket blow-off valve will not transform performance. Ascertaining the effect that the blow-off valve is having (eg if it is leaking and limiting boost) can be easily determined by blocking it off and then going for a drive. But don't just pull off the BOV's vacuum hose - it will then open more easily and will almost certainly drain away boost. Externally venting valves give the loudest noise, but can cause some engine running problems. This is the case because the air that has been measured by the airflow meter is exhausted to atmosphere, rather than passing into the engine. To attempt to overcome this problem, some aftermarket manufacturers sell valves that return ("plumb-back") most of the air to the turbo intake, while still venting enough to make the noise. Others dump high load air externally and recirculate low-load air. Another problem of an externally venting BOV is that, if the valve is open at idle, the engine will run badly as air is drawn in through the BOV, bypassing the airflow meter and also the airfilter!. Some manufacturers allow adjustment of the BOV opening vacuum, so that the valve can be configured to be shut at idle, but still open on the over-run. Cars fitted with aftermarket MAP-sensed management will not experience either of these engine running problems when fitted with externally-venting BOVs, though the lack of filtration when the valve is open at idle is still a concern. However, it is my viewpoint that BOVs are largely a waste of money, and that the factory BOV should be replaced only if it leaks under boost resulting in less boost than would otherwise be possible, or an aftermarket turbo is being used. When an aftermarket BOV is fitted to a car retaining airflow meter management, it should be of the plumb-back type.

 

Well stated, so I should look for a BOV that only partial dumps back in, to avoid any engine problems.

So what is the best BOV for a STOCK 03 WRX, that won't cause problems, that makes some noise.

haha no not the stock one.

So I'm seeking the loudest BOV that won't cause engine problems. Thanks.

 

like i said........a GO FAST BITS BOV........get the 50/50 hybrid....that way you can set it up to run half and half. look around on the for sale section....some people are selling them for a good price!!!! have fun!!!! later, riggs

ps....you can run the GFB BOV 100% atmospheric and you'll never have a prob running lean!!!!

 

the difference in turbo performance from the BOV will not be enough to really notice in daily driving though? I don't race the car 1/4 mile times.

 

http://www.shopatmastro.com/product....ddtocartmess=1

If you can't find one for cheaper used, this is the place to go for a new GFB Hybrid. Just ordered my from there.
They got overstocked by gfb so they're only $160