Quote:
Originally Posted by Booster_RL
I'm not an expert by any means but the entire line of reasoning for that BOV ad seems off to me. Channel more air AWAY from the turbo between shifts? Ermm... the car is a dual scroll turbo part of what makes it a bit of a monster for a 4 banger is the constant flow of air back INTO the compressor. Confused... 
As for WHY you would want a 400 dollar BOV----- "whooooooosh" nifty sound effect, albeit a bit expensive. |
A bit of Blow-Off Valve 101 here (forgive me for starting at the elementary end of the scale if you already know some of this, my intent is to illustrate for all):
The intention of a blow-off, or compressor bypass valve, is to allow the airflow that the turbocharger is creating to have a path for relief during sudden closed throttle events. It is when you close the throttle suddenly under power that the blow-off valve opens to bypass the air that otherwise would 'stall' the turbo up against the closed throttle plate.
If we do not bypass a sufficient amount of air, the turbocharger can be excessively decelerated, causing a 'sag' in power when you re-open the throttle (as in for the next gear). The stock valve has proven itself inadequately sized to flow enough bypass air to keep the turbo sufficiently spoooled.
boostednlinefor's explanation was spot-on too!