On my S4.5 (S5 engine), my blow off stays open for 4-6 seconds after releasing the throttle. Is this just bad valve placement, or is it a vac fail that causes this?

On all my other cars, the valve is open for a maximum of 1.5 sec and shuts clean, this car is going PSSSSSSSSSSSSSSSSSSShsssssssss(cant make smaller S'es, but continue like they are here). The valve is greased and moves easily.

I could try with another valve, but gief cash first :P But it sounds like a retard is trying to play with 1/18 cars or something. Not good.

 

is it adjustable? and how does your car not stall out?

 

What kind of bov? Stock or aftermarket or pos china stuff?

 

China stuff. It closes when I push the throttle again, but when I don't, like accelerating then going to idle/hold that speed, it stays open.

 

Like when your cruising and mantaining a certain speed? My dsm bov will hold it self open under slight throttle adjustments like your desribing, but a video may be more helpful. Also it could be the bov, havent heard anything good about ebay stuff.

 

When I go full throttle and get max pressure, and the go off the throttle, the valve is open for 4-6 seconds, like it is venting really slow, but it is pretty good flow through it, at least for stock 0.6 bar.

 

post a pic of it. Is it the type of BOV that is designed to be closed at idle?

 

Yes it is. However, it is a single piston one, may this cause the problem?

 

It needs a stronger spring, but that may cause compressor surge. Either get a proper valve that you can recirculate or go stand-alone so that it doesn't run poorly because of the atmospheric valve.

 

I would get rid of the China crap - I tried one and it lasted for a month - I now have a Turbo Techniques - Its a strong piece. The stock valve is designed to stay open at idle - As K-Tune said - The spring is just not strong enough.

Good news:

I have an extra Turbo Techniques BOV - $190

Bad News:

You have to have someone make you a flange for it - Mine was - $100 - I am sure he can make me another -

 

You know, the stock air bypass valve works just fine. If you want sound you can even vent it to atmosphere if you install a hardware store check-valve afterwards (although you will lose cool points b/c it's not aftermarket).

 

I bought it because my stock valve was opening too early so it was leaking under high load, which gave me lots of less Hp than I am supposed to have