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Well yea nothing wrong with the logic. You may not realise that your idle control valve does exactly this.. opens at idle. Similarly on some cars (supra that I know of) the idle control valve has its own filter.

Re youtube: I can't fathom why that BOV would be open on a car that is making positive pressure though, that is just boost leak. Unless it was purely for demonstration.. but a pretty retarded demonstration if he then shows the boost leak continues under load :S.

if you actually remove the plumback pipe from the std rb25 bov, it is actually open at idle just like this setup.

if you infact watch this other video, it works.

the whole point of it being open is to allow more free flowing air into the engine before boost. if you think about it as he shows you, the turbo adds an air flow "restriction" when the car is off boost thus downgrading your throttle response.

NOTE: it would only work if you have a plumback setup for the air being released from the bov to pass back through the AFM, or either plumback or non-plumback for MAP sensor ecu's.

Edited by OMY31T

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