Methanol is normally used as a form of intercooler. It is injected to reduce charge temperature and increase octane. It can also be used as supplimental fuel in a dual injector system. You can run the engine up to a certian horsepower on gasoline then add the Methanol to move hp up further.
It can be done in one of several ways. Use boost pressure to pressurize a bottle and force it in upstream of the turbo. Use a pump to inject it in via an orfice or injectors. Or other methods.
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