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Re: BOV or Diverter valve? (abergweedo2201)

Blow off valve will run your engine rich decreasing its performance over time. Diverter valve already exists in your car, but getting an aftermarket one teamed with a cold air intake is the way to go if you want that wooosh pss sound and increased horsepower.
 

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Re: BOV or Diverter valve? (jRh382)

So you would recomend just replacing the diverter valve instead of getting a blow-off valve? What diverter valves are good and do the increase performance with the addition of an intake?
 

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Re: BOV or Diverter valve? (abergweedo2201)

A diverter is also a recirculating design, venting the unused pressure to the intake side, where as most BOV's vent to the atmosphere.
Unless you are running insane amounts of boost on your 1.8T, a BOV is a no-no. The recirculating DV is a better idea for the VW motor. If you want an upgrade, I suggest a TT 225 DV, since its a little stronger than a stock VW DV.
A wastegate electronically controls the amount of pressure, or boost the turbo puts into the intake manifold by opening and closing the "bleed" excess pressure. Typically, there is a servo motor that attaches to the turbo that will open and close to keep pressure regulated.
for more info, http://www.howstuffworks.com/turbo.htm
 
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