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external wastegate with a 90+ manifold

Marvelous3

Marvelous3

Who engineered this?
Joined
Nov 12, 2002
Location
Atlanta
Is anyone using an external gate with a 90+ manifold? I'm trying to do this and am curious how people have the gate set up.
 
Marvelous3 said:
Have any idea what welding wire people use? 309?
Click to expand...

309L is my filler of choice when welding to cast-iron.

I heat the casting up with my 40k btu propane heater, weld them, post heat for 5-10 minutes, and then wrap it in a welding blanket until it's cooled down.
 
Use an internal wastegate housing, you can get a flange that bolts to it instead of the wastegate housing, do this:

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Use a NA manifold and fabricate a nice steel up-pipe (can be twin entry).

Weld wastegate flange to up pipe.

Flows better than 90+, proven to 600+hp.

No need to weld cast, good performing manifold, and cheap as hell.
 
The bit that looks like a trumpet going off to the right is what mounts the WG. It's been tweaked a little since this pic and is tapped right before the WG entry to get a pressure reading.
 

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