Re: Still slow with the supercharger I doubt the pistons will be on THAT low compression to get out 800 horses just from upping the boost pressure. When boost is raised significantly, youd want a lower compression ratio. Remember that. Plus, Yes, v8s, or ANY other cylinder car would stuff up quickly if boost is 22psi. Main reason: High compression pistons. Many engines can handle turbo/superchargers, aslong as you don't push them. Most original non forced induction engines which are then blown without any changes to internals, use around 6 to 9 psi, which is a "safe" level.