how to modifie a internal wastegated turbo to a external wastegated turbo

[tuner9069]

I've got a Evo III Big 16g with 20g compressor turbo. I've heard that it is possible to convert my turbo from a internal wastegate settup to a external wastegate settup. Is this true? And how do I do it?

 

[4g63jojo]

yes its true....you have to weld the waste gate flange shut then you need a different exhaust manifold that is fitted for an external wastegate , then all you need is the external wastegate itself

didnt know they made those things like Sirnixalot shows, that would be a better more cheaper route than what i said so yea forget what i said

 

[Sirnixalot]

by cutting off the internal flap and with something like this
MAP 38mm External Wastegate O2 Housings / Stainless Steel (DSM) - Modern Automotive Performance

 

[dexterholland04]

To consolidate everything that was said, you can run externally gated in one of two ways:

1. Weld the internal wastegate flapper shut and run an external wastegate on the exhaust manifold (requiring you to buy a new manifold). Open dump is the norm off of this setup, as it is a little more work to route the exhaust back into the downpipe (not worth it in my opinion).

2. Eliminate (cut off the internal wastegate flapper) and run an external wastegate off of the o2 housing. This would require you to buy a new o2 housing. In my opinion, this is probably the better option because logistically, it is very easy to run an o2 housing that is dumped into the exhaust (much like the stock setup). It is very easy to run this type of setup open dump (just make sure that the dump tube clears your lower intercooler pipe).

Punnishment Racing has awesome external wastegate setups that you can run off of the o2 housing (both in open dump and non-open dump varieties). I would start there!

 

[tuner9069]

thank you everyone for all the info.

 

[SpawnedX]

You still probably need to port the turbo if this is a boost creep issue.