Turbosuperchargers for Militarist Japan

Militarist Japan's airplanes were often handicapped throughout the war by the lack of efficient turbochargers and turbosuperchargers. This is not to say that none of the Japanese aircraft had turbochargers or superchargers, as some did. Nevertheless, there were quite a number of Japanese designed that were intended to have turbochargers (e.g. the Raiden interceptor), yet continued to lack them during the war, often due to the lack of sufficient high-temperature alloys.

My question, then, has two parts:

1.) What is the best turbocharger or turbosupercharger, fitted to an airplane, that can be convincingly sold to Militarist Japan before the outbreak of war, or captured by them during the first phase of the war?
2.) What is the effect on the war if Militarist Japan is able to fit these devices to those airframes which were intended to have them, but never did in OTL?
 
Militarist Japan's airplanes were often handicapped throughout the war by the lack of efficient turbochargers and turbosuperchargers. This is not to say that none of the Japanese aircraft had turbochargers or superchargers, as some did. Nevertheless, there were quite a number of Japanese designed that were intended to have turbochargers (e.g. the Raiden interceptor), yet continued to lack them during the war, often due to the lack of sufficient high-temperature alloys.

My question, then, has two parts:

1.) What is the best turbocharger or turbosupercharger, fitted to an airplane, that can be convincingly sold to Militarist Japan before the outbreak of war, or captured by them during the first phase of the war?
2.) What is the effect on the war if Militarist Japan is able to fit these devices to those airframes which were intended to have them, but never did in OTL?

Since the fitment issue is the inability to make them due to insufficient materials, how does a sample help?
 
Since the fitment issue is the inability to make them due to insufficient materials, how does a sample help?

I think the main problem was lack of knowlege of what metals in what quantities make up the alloys. If I am correct about that, then the sample will help a lot.
 
They had samples of GE superchargers, they had attempts to modify aircraft to employ turbo-chargers, and they had aircraft custom-built to employ them. Some flew. None reached a satisfactory level of maturity.

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