Purpose of a external wastegate?

[Niteninja01]

I've looked through the forums and can't find the answers that I'm looking for. What is the purpose of the external wastegate? And what do I need to run one? Is there a kit out there for this or do I have to piece one together myself? And is this just for if your going to run alot of boost? Any help would be great. Thanks.

 

[saechao04]

http://www.dsmtuners.com/forums/newbie-forum/285644-wastegates-internal-vs-external.html

http://www.dsmtuners.com/forums/turbo-system-tech/213582-external-vs-internal-wastegate.html

I found these using the search, I found the first one particularly helpful.

 

[jrohner]

Going by your profile, no you don't need one. Some turbo's don't have an option for an internal wastegate, so an external is the only option for boost control; others just run an external instead for (possibly) better boost control.

I put a wastegate actuator off a Dodge Cummins diesel on my 16G, and, with ECU-based boost control, I'm running about 28+ psi all the way up to top end on this little turbo.