rx 1.3

Everytime I turn on the car in the morning I hear the air just flowing out of the bov is that normal. and my boost sometimes fluctuate......thanks

Ouijan

Are you sure it is the BOV? The BOV only releases air that has been under boost (i.e. turbos are spinning). I don't think this happens at idle.

Lost Time

Yeah, you need to check the bov and see if that is where the sound is coming from. It should not be venting anything at idle.

Zoomspeed

It would if the AWS system is still in the car and it was the first start up of the morning. I think its either the CRV or the BOV. Do you have both of them vented to the atmosphere?

Quickfini

iTrader: (6)

Yeah i noticed that it did that too.. like the very first start of the morning.. it'll be gushing air out...

rx 1.3

I have one disconnected, I swaped bov to check if they are woking and it still does the same thing, air just flowing out. Is this normal for stock bov...

P'cola FD

Whenever there is vacuum present in the intake manifold the BOV will be open. That's why if you're accelrating, but not enough to boost, like casually up a hill, you can hear it bleeding off.

95R2-89TII Ground Zero

That happened to me too. Yeah, I could see it bleeding off at idle if there's vacuum.

maxcooper

If there is vacuum, won't it be sucking air in, rather than venting it out? Also, it shouldn't open unless there is some significant amount of vacuum (which you may in fact reach at idle, I don't know how much it is for sure). It doesn't open under just any vacuum.

The AWS system is unrelated to the BOV. It has a solenoid on the underside of the extension manifold and a hose the goes to the outside of the plastic pipe that connects to the throttle body.

-Max

Zoomspeed

but if you start the car in the morning and the AWS system kicks in and shoots your RPMS all the way to 3kRPM, then that boost generated by that exhasut flow has to go somewhere right?

maxcooper

That's a good question. Our boost gauges are usually hooked up the manifold between the throttle plates and the engine, so it is conceivable that there is boost between the throttle and the turbo, even when the boost gauge shows vacuum.

However, the AWS system opens a path that goes around the throttle plates, so it seems that if there was boost, it would find its way to the manifold through the AWS solenoid and still show up on the boost gauge. I don't think there is any boost created by the AWS startup routine.

You can cruise at 8000 RPM with no boost, so RPM does not necessarily lead to boost.

-Max

spooledUP7

I believe that the primary turbo makes more pressure than air being draw into the engine when at idle and this is why you can feel boost venting from the blow off valve. The fact that the throttle is closed explains why you don't see boost on the gauge. I could be wrong