1 external wastegate on split manifold?

[Funfettie]

Alright, So I have a split port twin/scroll turbo setup, and the internal wastegate setup just isnt working for me. The actuator(turbosmart actuator) is maxed out on springs and cant keep shut under hard boost (34psi). So im looking to go external, ad my question is, do i need to run 2 external gates seeing that its split port, or can i get away with piping both sides exhaust runners to a single wastegate?

The turbo is a MAP evo10ef4, so i thought about removing the flapper and tossing the external gate in there, but MAP says this.

"we tested it and removing the internal flapper did result in significantly slower spool. Keep the internal actuator in place with a straight boost source and run a second boost source with boost controller to the external wastegate"

Thoughts/opinions?
Thanks!

 

[ervin00]

The right way to do it would be to remove the flapper and weld the hole shut, and the purchase or fabricate a riser(spacer) between the turbo and the manifold to run the external wastegate. http://www.ebay.com/itm/T3-Custom-w...Parts_Accessories&hash=item51a856ed30&vxp=mtr

 

[ervin00]

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[Funfettie]

very interesting piece, didnt know something like this was even made! Only issue is, the hotside is off a 10.5 twin scroll Evo10 turbo, so im not sure that flange would be available?

 

[ervin00]

Just research it, when I was building my Supra I ended up just water-jetting my flanges. Depending on your fabricating skills and assuming you have access to water-jet, laser or even a cnc machine its fairly easy. Don't really want to mention flame cutting because of the horrible finish and risk of warping but one more option. When you start building cars and motors sometimes you have to get creative.