I've been thinking of an idea lately to increase the power to weight ratio of an internal combustion engine. It's from an already proven concept, anti-lag turbo. There's different types of anti-lag but the kind i'm referring to is sometimes called combustor can anti-lag. Basically a combustion canister with a fuel injector is added, with a bypass from the compressor going to this combustion chamber (which is part of the exhaust manifold) effectively turning a conventional turbocharger into a gas turbine engine. The turbo can be spun up to full rpm while the engine is at a low rpm; so boost is available the instant it's needed, zero lag. Now i've been thinking of using this concept but in a little bit different way. Instead of just using it to spin the turbo up to speed, using it full time like a supercharger. In this setup there will be two turbochargers; one that is run like a regular turbo from the engines exhaust gases. The second one, is the gas turbine engine. The compressed air from the first turbo, goes into the compressor of the gas turbine engine, where it is further compressed. From there it goes through a Y-pipe, this Y-pipe goes to the diesel or gas engine, and to the combustion chamber. I don't believe a valve would be needed as the pressure differential should control the flow. The compressor wheel on the gas turbine engine is larger than the turbine wheel, so all of the energy from the turbine wheel is used to spin the compressor wheel. Another option would be to have the gas turbine engine be the gas producer, and have another turbo (yes a third turbo) that uses those exhaust gases to spin a turbo and compress the intake air. Basically it takes a lot of horsepower from the gas or diesel engine to spin a supercharger, of course there is a net gain in power from using a supercharger. With a setup like i'm describing it's like having a supercharger that powers itself. For a spark-ignited engine, water injection and an intercooler would be required to lower the charge temperature and prevent engine knock. I know it's kinda a crazy idea, not sure if it would have a place outside of racing. I'm just wondering if this would be more or less efficient than just using a larger reciprocating engine to power a supercharger. Or maybe a turbo that goes into the supercharger to make even more boost?