I Need a Dyno!

How can one build engines without having a dyno to really gauge how the changes and upgrades they made would affect the engine?? Dynamometers are very expensive, but luckily, I managed to come across videos showing other people able to build their own so I am going to try my hand at building my own dyno as well, and an inertia dyno specifically. Here are some of the information I have gathered from research, and if you guys are trying to build an inertia dyno too, it should be of great help to you too. Instructions and tools for building an inertia dyno: http://www.dtec.net.au Data collection Arduino shield "Ardyno": https://ardyno.weebly.com Completely free Dyno PC software: https://github.com/kjellegafvelin/Sim... -------------------- I‘m on Instagram @js_racing_jason