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Message: <blockquote data-quote="HKS-GT2835R" data-source="post: 843422" data-attributes="member: 2710">like you said, what they do is maintain your boost level at a desired pressure, simply by bypassing the exhaust gasses from turning the turbine thru a simple gate or door. in the pix below,there's two holes, the left one with the blade is ur turbo's main exit, and the right one is the turbo's internal wastegate. that ugly round flap door is opened by... http://wwwrsphysse.anu.edu.au/%7Eamh110/all_gifs/Turbo%20page%20gifs/ExhTurbine.gifthis thing..the wastegate actuator.http://cjsupra.kendra.com/graphics/CT26Coat/CT26WstS.jpgthe tip on the left is connected to your plenum, see..so when the pressure inside the plenum arises, it'll push the actuator's rod (the bar with hole on the left), which opens the wastegate's door. that's how it control ur boost.IMO those OEM internal wastegates shud be good up to 1.3~1.4 bar. in my experience (or lack of!), when you go higher than 1.5bar, (or u wan ur engine to look cool! ) then an external wastegate shud be in order.yah. they can..i vnvr used it before, but if i remember correctly,u turn that small bolt on top to your desired spring hardness. the harder the spring=gives higher boost.http://www.overboost.com/obs/product/ts_fg-wgate-35.jpg</blockquote>

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