By definition internal wastegates are turbine bypass systems. In the stock 16G TS turbine housing, the bypass ports are passageways which initiate in the turbine inlet area.

CO VR 4, is right in a way, in that the flapper valve in the 16G's turbine housing is located at the far end of the wastgate bypass ports. The flapper valve assembly shares a common cavity with the turbine exducer. However, the flapper valve is mounted onto the turbine housing and not the O2 housing. The exhaust gases which pass through the bypass ports and out past the flapper valve, vent into the O2 housing.

The bypass ports in an internally gated turbine housing must initiate before the turbine housing's main scroll area. Internal gates must bleed off exhaust gases from the turbine inlet area, before these gases hit the turbine blades.

So, on an internally gated housing with the O2 housing located after the turbine exducer, a wastegate, sourced after the exhaust gases pass through the turbine housing would be non-functional.

In fact, all wastegates, both internal, as well as external must be sourced before the turbine wheel. That's all I was trying to say, CO VR 4.

Yes, the O2 housing on some other internally gated turbo setups, such as the Buick GN's is located pre-turbo. I have no argument with you there, CO VR 4. But, the fact still remains that no wastegate sourced after the exhaust gases pass out through the turbine housing is going to be in any way effective at controlling a turbine's rotation.

 

Yes i had a FP 18 psi actuator that took and crap on me, they wouldnt return it. FP whats up with that?

 

This happened to a car we had at our shop also with a green.

 

YzBrad: If you are running a IX turbo w/o meth, then the stock actuator will be up to the task. The FP unit exhibits a characteristic, and in some cases undesirable boost spike. If you must have an aftermarket HD actuator, then the Forge Motorsport unit is the one to get, IMO.

 

All,

Thanks for the info, yes i understand how wastegates work, perhaps I was unclear when i specified what i was looking for, so here is a pretty picture It is *not* for an evo (i can't find any), but for a dsm.

Yes, the flapper falling off spawned my question whether or not we can do a tial wg setup on the evo's stock turbo form factor (specifically for my green turbo) and whether it was a matter of simple fabrication if no vendors have a solution. Dsmer's have had this option for a while so an external wastegate with the mitsu form factor is in fact possible.

 

There's no benefit in using an O2 housing pictured above with external WG unless you not only remove the stock flapper from the hotside but also port the puck area bigger. Not worth the trouble AT ALL.
Besides if you want to fab an external gate to an O2 housing you might as well make it an open dump, the thing pictured above looks to recycle WG exhaust stream back into downpipe... At a bad angle too.. Which will just create turbulance.

 

I completely understand that, i just was looking for more boost up in the higher rpms but all this WG did was create boost creep like crazy, then it broke. So i will stick with the stock one for now.