wastegate dumping. . . been there doing that

Huw Powell audi at mediaone.net
Sat Nov 3 02:13:30 EST 2001

if you dump the wastegate to atmosphere aren't you letting your exhaust
gases out under your hood?  I only ask because 1. the heat might hurt
something and 2. the poisonous gases kinda need to be routed to behind
(or to the side of) the car usually.

Stpndsmnn at aol.com wrote:
> Currently, the wastegate on my CGT turbo is dumping to the atmosphere.  I cut
> off the factory pipe and welded over the intersection of the two.
> Interestingly for those putting 10V turbo engines into 4ks this will get you
> around the tie rod.
> when the wastegate cracks open under boost it makes a loud SHHHHHHH sound as
> exhaust pushes through the opening, when you shift the wastegate is closed so
> no cool sound.
> The cool sound comes from the bypass valve, unfortunately the plastic Audi
> valves are not much on noise which is why I used an Eagle Talon valve.  Now I
> get the loud PSHHHHH between shifts under boost.  For a lot of sound I would
> get a Greddy type S valve which has an adjustable sound control.
> As far as I can tell there is no detrimental effect from dumping the
> wastegate, It shouldn't affect the cats at all and there is more than enough
> exhaust running through the tiny O2 sensor housing under boost.  The
> wastegate tube bypasses the O2 sensor anyway so this is not a concern.
> Personally I like having the WG dumped, I think it sounds pretty cool under
> boost and it did save me from having to get one of those special bent
> tie-rods.
> Good luck to those interested,
> Matt Kramer
> '83 CGT turbo in p-town

Huw Powell



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