bov

oscolivar1

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Feb 8, 2006
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87supraturbo19 said:
all the bov does is release left over boost, right? so if it was not working properly could get to much boost?

it releases the left over air in the throttle body......and if ur BOV wasnt working properly your Turbo will be taking a lot of damage and you will end up blowing it up....the better the BOV the longer your turbo will live.....
 

oscolivar1

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Wendigo said:
How do you test one?

i dont know how to test the BOV, but if ur trying to test the stock one i would suggest to replace it with a better one.... IF u get a bov kit and install it right u wont have ne problems.... i have a Turbo XS Type S its great and ez to install...
 

boltz

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Jun 17, 2005
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if you take the stock one out and you can blow through it then it is stuck open.

If you apply vacuum to the small vacuum line port you should be able to blow through the BOV. If not then it is bad.
 

GrimJack

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Dec 31, 1969
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It releases pressure from the intake tract when the throttle plate is closed. Without it, the pressure will back up into the turbo, causing compressor surge - where the engine is trying to spin the turbo one way, and the pressure backing up in the intake tract is trying to spin the compressor side of the turbo the other way.

Makes for nasty wear, and can break the 'axle' that connects the turbo hotside with the compressor side. This can also be caused by using a BOV that is too small for the power you are pushing through it - like using the stock unit on a system with a larger turbo, hardpipes, and a replacement intercooler. With this setup, you would get compressor surge even if your stock unit was working perfectly, it just can't let enough pressure out at once.

A faulty BOV will usually refuse to hold boost - so it will be harder to get full boost. The tests above will tell you if yours is faulty or not.