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Hey guys so I'm trying to install a bov on my mini 1.5 Turbo. The only problem is I just can't locate the place of the bov. The turbo is pretty deep in the engine. Does anyone know how I could locate the place of the blow off valve?

here is an illustration of the engine:
 

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Well, the dump valve will be somewhere inbetween the charger and the inlet manifold, before the charge cooler normally. I don't see one there...

Why do you want one? Is your turbo stalling?
 

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You can look all you want but these engines do not have a diverter valve or blow off valve. They use the wastegate to regulate pressure.

Blow-off valve
A blow-off valve is not used in current models. Pressure peaks, caused by sudden load shedding due to the inertia of the turbine of the exhaust turbocharger, can be avoided by careful tuning of the Digital Motor Electronics software. With foresighted charging pressure control, pressure peaks can be predicted and reduced by quick adjustment of the electrically-adjustable wastegate valve. Assisted by a delayed load control of the Valvetronic (in the minimum lift direction) or the throttle valve (in the closed direction), the remaining charge air which is produced can be routed to the exhaust emission system via the engine. This form of control thus prevents the exhaust turbocharger shaft from being exposed to excessive torsional stress due to high pressure peaks.
 

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Why not? Not everyone’s taste but I don’t like the air filter chirp that you get as stock.
Plus now it sounds like a proper dump-valve. Just wanted to prove it can be done tbh

https://youtu.be/UbTMEIxCM4I

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Sounds really nice. Easy to install? Where did you get the part from?

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Sounds like a little too much trouble and expense for a noisemaker, since it seems to serve no purpose mechanically. I had a Forge diverter/BOV installed on my R56 MCS and liked it a lot, but it served a purpose in that instance.
 
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