3.3 BOV Question

[HallasanGreen3.3T]

Hi community hope everyone had a great week. I just have a couple of questions regarding the 3.3 engine and blow off valves.

#1 from the factory our cars do not release the air to atmosphere and instead it recycles the air. Now I've seen several youtubers claim this car doesn't need to recycle the air, and when you add a BOV and release the air to the atmosphere it doesn't affect the car at all. Is this a true statement? I would assume the car would run rich since the ecu is anticipating the return air and adds fuel to accommodate for that air. A youtuber claimed this G70 is "speed density vehicle and recirculation isn't needed" and I wanted to come here and ask this community if this is a true statement. I was hesitant in adding a bov as I assumed it would throw the computer off

#2 for those running a bov which brand did you go with and why?

Thank you all so much in advance

 

[Volfy]

Hi community hope everyone had a great week. I just have a couple of questions regarding the 3.3 engine and blow off valves.

#1 from the factory our cars do not release the air to atmosphere and instead it recycles the air. Now I've seen several youtubers claim this car doesn't need to recycle the air, and when you add a BOV and release the air to the atmosphere it doesn't affect the car at all. Is this a true statement?

"Doesn't need to" is far from "having no benefit(s)". Here are a couple of points to consider:

A. When the stock waste gate opens, it dumps the excess pressure back into the (low pressure) suction side of the turbo. This could potentially keep the turbo compressor wheel from slowing down excessively. By keeping the turbo spinning, when you do get back on the throttle, it might just build boost a fraction quicker. How much this helps depends on how quickly you get back on throttle, but it can only help and has absolutely no down side.

B. In the unlikely event that the waste gate should be stuck open, or even become sluggish in its closing, the close-loop circuits might at worse draw clean air from the turbo inlet track. If the same thing happens with a BOV that vents to atmosphere, that could potentially draw in very dirty/dusty underhood air. While the likelihood of this is not great, it is nevertheless not impossible. I myself do not like to temp fate, unless there are real substantial benefits, of which there are NONE.

Well... I suppose some folks do enjoy hearing the PPSSSHHH, PPSSSHHH... noise. That could be a benefit. Maybe... maybe not. Personally, I couldn't care less to hear the turbo noises. In fact, it almost never fails when I work corners at the local AutoX, some novice with their loud-ass BOVs would clearly annunciate their inability to drive properly by letting their foot off the throttle 6-times going around a nice long sweeper. The BOV noises don't sound impressive; they make the driver sound amateurish.

I would assume the car would run rich since the ecu is anticipating the return air and adds fuel to accommodate for that air.

FALSE. The Mass Air Flow sensor is wayyy downstream of the wastegate/BOV and won't see - nor care - whether or not the excess pressure is vented to atmosphere or back into the intake track. Unless there is a leak between the MAF and the engine's intake ports, the MAF will measure EXACTLY what is going into the engine, allowing the ECU to meter fuel correctly.

A youtuber claimed this G70 is "speed density vehicle and recirculation isn't needed" and I wanted to come here and ask this community if this is a true statement. I was hesitant in adding a bov as I assumed it would throw the computer off

That sound like somebody is throwing out technical jargon without actually knowing what da heck they are talking about.

#2 for those running a bov which brand did you go with and why?

Thank you all so much in advance

The ONLY reason for going with an aftermarket BOV, is if your modifications have increased turbo boost pressure above the stock wastegate's pressure rating. Even then, I would dump the blow-off back into the intake track, if at all possible.