Hello guys, I am working on building a 1GR engine, which I have lying around (had two bad rings from poor supercharging). I would like to build it with reduced compression ratio, to allow me to boost the engine. I am torn between dropping the CR just a little, or significantly. My initial thought was to drop it to 9:1, but then I started thinking why not go even further and drop it to 8.5:1. What are the side effects of dropping the compression too much? I know less compression means I need more boost, so is there a way to calculate how much boost I need to mke on, say, 8.5:1 CR? My target is around 500 HP. I'm planning on supercharging it using a Rotrex supercharger. What are your thoughts and recommendations? Here's a picture of the engine I'm building: (too bad I can't upload pictures yet. Need to have ten posts) This is my second engine build, and first high performance engine build.