snowbird Posted December 8, 2011 Report Share Posted December 8, 2011 On the stock o2 manifold I see that where the wastegate flapper looks like it'd be there's a plate? I'm wondering how the exhaust gas is routed once the flapper opens? Is it Rerouted back into the main exhaust housing before it exits? Quote Link to comment Share on other sites More sharing options...
Dred_85.5_TSI Posted December 8, 2011 Report Share Posted December 8, 2011 yup, it gets rerouted in the housing so that is bypasses the turbine wheel Quote Link to comment Share on other sites More sharing options...
snowbird Posted December 8, 2011 Author Report Share Posted December 8, 2011 Thanks, I just figured it'd be more efficient just dumping into the downpipe Quote Link to comment Share on other sites More sharing options...
QuestFan Posted December 8, 2011 Report Share Posted December 8, 2011 Hence the reason why most people go with an external wastegate. More efficient. Quote Link to comment Share on other sites More sharing options...
Earl Posted December 8, 2011 Report Share Posted December 8, 2011 You can dump into the downpipe, or run an o2 dump off of the stock turbo. If you want to run an external wastegate you can drill out the pin and remove the wastegate flapper and press in a plug to seal that opening. Otherwise you just leave all of the wastegate assembly how it is, but port the hole that the flapper covers. After that you then make a rectangle of steel the same shape as the route back into the exhaust, and slightly oversized. Form it to fit the contour of the inside of the exhaust opening, and then put a tack weld at each corner. It doesn't need to be sealed tight. It just needs to allow the air to pass through the o2 housing and take the path of least resistance out the back. Then from there you make a flange and dump pipe to either route down, or to enter back into the downpipe without disrupting flow. It's doable and has been done. Quote Link to comment Share on other sites More sharing options...
snowbird Posted December 8, 2011 Author Report Share Posted December 8, 2011 Alright good to know, can't see spending $$$ on an external wastegate that would need even more $$$ to be routed into the downpipe. I'm guessing theres no company that makes a downpipe that just eliminates the O2 manifold? All I can find are $200+ downpipe that are similar to stock but without the cat Quote Link to comment Share on other sites More sharing options...
StarquestRescue Posted December 8, 2011 Report Share Posted December 8, 2011 http://motors.shop.ebay.com/i.html?_from=R40&_trksid=p3841.m570.l1313&_nkw=starion+down+pipe&_sacat= http://www.racetep.com/starexhaust.htm *DM has them for less from time to time.http://www.*DMperformance.com/ Quote Link to comment Share on other sites More sharing options...
Skullzaflare Posted December 9, 2011 Report Share Posted December 9, 2011 Alright good to know, can't see spending $$$ on an external wastegate that would need even more $$$ to be routed into the downpipe. I'm guessing theres no company that makes a downpipe that just eliminates the O2 manifold? All I can find are $200+ downpipe that are similar to stock but without the catthats because you need an 02 sensor Quote Link to comment Share on other sites More sharing options...
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