Removing internal wastegate on a T3

[24OZ]

Hi guys,

 

I have a stock internal wastegated T3 turbo, is it possible to remove the wastegate so I can use this turbo with an external wastegate?

 

How would I go about it and what is involved. Anyone else done this?

 

I did a search on external & internal wastegates but didnt find any info.

 

Thanks.

[wigenOut-S30]

There are 5 bolts on the back of the exhaust side of the turbo. Remove them and take off the wastegate housing. Now you will be looking at the back of the turbo and see 2 holes. one where with the exhaust wheel and the other which was the old wastegate hole. You will need to get a block off plate and then make a custom downpipe flange so you can bolt on the downpipe.

[dosquattro]

Just weld that flapper shut and ditch all the wastegate actuator stuff and you'll be set. Then just buy a 5 bolt flange that just has the opening for the exhaust and not the wastegate hole.

[jgkurz]

I'm going through that exact same project of removing the internal wastegate and adapting an external unit. I think I extracted about as much power from the internal wastegate as possible. I believe my old DP, exhaust and turbine outlet size were causing a major back pressure problem. My .63 Nissan turbine is modified with the wastegate hole ported and a 2.5" turbine wheel. I found a block off flange for the Nissan T3 housing on eBay. It was item # 120071126666. There are plenty of these flanges available but they all seem to be for the Ford style housing instead of the Nissan.

 

Unless I run into a fabrication problem I will be welding up a 3" DP and 1.5" wastegate port to the flange. As a result I'm hoping for quicker turbo spool and more peak power.

[Pyro]

this works good for me

[24OZ]

I'm going through that exact same project of removing the internal wastegate and adapting an external unit. I think I extracted about as much power from the internal wastegate as possible. I believe my old DP, exhaust and turbine outlet size were causing a major back pressure problem. My .63 Nissan turbine is modified with the wastegate hole ported and a 2.5" turbine wheel. I found a block off flange for the Nissan T3 housing on eBay. It was item # 120071126666. There are plenty of these flanges available but they all seem to be for the Ford style housing instead of the Nissan.

 

Unless I run into a fabrication problem I will be welding up a 3" DP and 1.5" wastegate port to the flange. As a result I'm hoping for quicker turbo spool and more peak power.

 

Thanks John I found that part. So does it have to be welded on to the turbo? Not bolted on

 

I purchased the MSA Turbo Downpipe, will I not be able to still use that?

[jgkurz]

Thanks John I found that part. So does it have to be welded on to the turbo? Not bolted on

 

I purchased the MSA Turbo Downpipe, will I not be able to still use that?

 

The flange is bolted to the turbine housing not welded. If you decide to use the block off flange and get rid of the internal wastegate you really don't need the MSA downpipe, at least in it's original form. With the block off flange you would be better off welding up a custom DP and external wastgate like "Pyro". If you were going through all that trouble I'd also go to a 3" DP. If you decide to go this route, let me know and I'll show you where I got all my parts.

 

However, there is absolutely nothing wrong with staying with the internal WG and MSA pipe. It just boils down to your fabrication skills and horsepower goals. On my car, even though I used a modified internal wastegate and custom 2.5" DP, it still created significant back pressure and reversion problems above 10psi.