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Twin Turbo K24 Locost Planning

Old 07-19-2016, 07:20 PM
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Default Twin Turbo K24 Locost Planning

So I'm planning to swap a k24 into a Lotus 7 clone.
Biggest challenges seem to be making it fit height wise and figuring out an exhaust setup as it would need to be custom.

So to avoid the later cost I started doing the math, and if I just built a turbo manifold from schedule 40 pipe, used an OEM turbo with the internal wastegate and a 1g DSM BOV I could make a turbo kit for the same money as having a nice tubular manifold built.

But the challenge is cheap OEM style turbos are hard to find that make 400whp which is where I'd like to be.
Which brought me to the idea, why not twin turbo. I think the manifold would actually be easier to build with 2 turbos (at least the collector would be easy) and finding small OEM turbos that make 200-250whp shouldn't be difficult. Then I could use their integrated wastegates (saving me money) and the 1g DSM BOV is good for at least 17psi which on a k24 will get me to 400whp more than likely.

Looking for recommendations on turbos.
The car will be used on the street, autox HPDEs, and I'm sure I'll bring it to the strip but only to see what it can do.. no intention of drag racing it, so responsiveness would be nice, cheap is even better.

Last edited by sciff5; 07-19-2016 at 07:23 PM.
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Old 07-20-2016, 08:01 PM
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Originally Posted by sciff5 View Post
So I'm planning to swap a k24 into a Lotus 7 clone.
Biggest challenges seem to be making it fit height wise and figuring out an exhaust setup as it would need to be custom.

So to avoid the later cost I started doing the math, and if I just built a turbo manifold from schedule 40 pipe, used an OEM turbo with the internal wastegate and a 1g DSM BOV I could make a turbo kit for the same money as having a nice tubular manifold built.

But the challenge is cheap OEM style turbos are hard to find that make 400whp which is where I'd like to be.
Which brought me to the idea, why not twin turbo. I think the manifold would actually be easier to build with 2 turbos (at least the collector would be easy) and finding small OEM turbos that make 200-250whp shouldn't be difficult. Then I could use their integrated wastegates (saving me money) and the 1g DSM BOV is good for at least 17psi which on a k24 will get me to 400whp more than likely.

Looking for recommendations on turbos.
The car will be used on the street, autox HPDEs, and I'm sure I'll bring it to the strip but only to see what it can do.. no intention of drag racing it, so responsiveness would be nice, cheap is even better.
Twin 14b maybe?
Don't know how a turbo like that would spool being fed by only 1.2L
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Old 07-21-2016, 09:34 AM
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Keep in mind it's not just the engine displacement; it's the total airflow. I'd imagine an engine that made 200 hp NA could spool two of those fine.
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Old 07-21-2016, 04:33 PM
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Originally Posted by Matt Cramer View Post
Keep in mind it's not just the engine displacement; it's the total airflow. I'd imagine an engine that made 200 hp NA could spool two of those fine.
Thank you for the reply.
I was looking at 3si.com and twin 14Bs are used, twin 13t (stock WRX turbo) is even more common and people have made just shy of 500whp on them with instant spool.
14bs they said were laggier.
This seems to be the only group using these turbos in twin configuration.

I would imagine it would be the same on the k24. Although the k24 is smaller, it seems to flow a lot of air.
It actually takes less boost (PSI) to make 400whp on a k24 than in a 3000gt/stealth. So that tells me that lack of restriction will hopefully mean similar spool characteristics.

13Ts are cheap, but whats up with the crazy looking oval/rectangular shape coming out of it for the downpipe? doesn't look like a shape that I could form round exhaust tubing into.
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