I am curious if it'd be possible to turbo charge a lawn mower engine? if so, where can i find a small turbo at to use? im sure i can make my own piping, i want it for my go-cart and i just want that extra speed and the bov sound!
a turbo won't really help you much on a lawn mower engine. The lag will probably hurt your speed more than it helps.
What kind of fuel are you using? If you are using gasoline you would be better off mixing alcohol in with the gas instead of installing a turbo.
Personally if it were me I would get rid of the gas engine and install an electric motor. An electric motor will give you a lot more torque at lower rpms.
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