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Old 10-18-2015, 09:47 PM   #1
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Default Stock turbo with external waste gate?

I'm starting to piece together a turbo setup for my lotus 7. Because of space I am looking for a turbo with an external waste gate. The added flexibility will help with positioning.

I tried Google but mainly found links to people wanting to convert their wrx to external...

Any help with good miata based turbos without an internal waste gate is appreciated!
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Old 10-18-2015, 09:55 PM   #2
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Most people just wire or weld the internal wastegate flapper shut, and then use an external wastegate.
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Old 10-18-2015, 10:00 PM   #3
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Originally Posted by Schuyler View Post
Most people just wire or weld the internal wastegate flapper shut, and then use an external wastegate.
Ya. I did that on my rx7. Was hoping for an exhaust housing that I could braze a vband clamp to... Without a plate etc..
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Old 10-18-2015, 10:14 PM   #4
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Which turbo are you considering? Many turbos have aftermarket turbine housings that are set up for external wastegate. For example, I have a TD04HL-20t from a Caliber SRT4, and use an aftermarket turbine housing made by Kinugawa that doesn't have an internal wastegate.
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Old 10-18-2015, 10:29 PM   #5
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Originally Posted by acedeuce802 View Post
Which turbo are you considering? Many turbos have aftermarket turbine housings that are set up for external wastegate. For example, I have a TD04HL-20t from a Caliber SRT4, and use an aftermarket turbine housing made by Kinugawa that doesn't have an internal wastegate.
I looked at a few Volvo td04hl models but they all had internal waste gates

Ideally I want to be in the 220-300hp area so gt28s and gt3071 has been on the radar.

Pricewise-trying to avoid what a new Garrett costs so changing a housing doesn't help the budget :/
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Old 10-18-2015, 10:35 PM   #6
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For reference, I make 230 whp at 9 psi on a TD04HL-20t with a 6cm turbine housing, and it doesn't run out of efficiency until 20 psi or so, so it's definitely capable of more. I hear that TD04's are pretty cheap used (I got mine free, so I don't know the used market), and the turbine housing was a little but over $100.

If you're really on a budget, I would think that more focus should be put on packaging an internal wastegate. Do you already have a manifold? Do you have the fabrication know-how to make a manifold, or are you looking for off-the-shelf?
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Old 10-18-2015, 10:51 PM   #7
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Quote:
Originally Posted by acedeuce802 View Post
For reference, I make 230 whp at 9 psi on a TD04HL-20t with a 6cm turbine housing, and it doesn't run out of efficiency until 20 psi or so, so it's definitely capable of more. I hear that TD04's are pretty cheap used (I got mine free, so I don't know the used market), and the turbine housing was a little but over $100.

If you're really on a budget, I would think that more focus should be put on packaging an internal wastegate. Do you already have a manifold? Do you have the fabrication know-how to make a manifold, or are you looking for off-the-shelf?
I have the skills and plan to make a ram style manifold that sits lower in the frame.

I'll look and see what I can find. I figured some oem must have gone external with their wg
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Old 10-19-2015, 12:23 AM   #8
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the ones that did, are all ancient.
most (maybe all?) affordable modern are all iwg from the factory.
good luck.
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