Turbo BS Thread

So like...it just loses pressure, or what? Idk what that means...
VE drops? More exhaust stuck in the next combustion stroke?

 

Back pressure rises, VE drops. More pressure doesn't directly mean more power. The scale isn't 1:1 at least. An appropriately sized turbo may make 8psi and 285hp (example nums), a too small turbo may also hit that number but at 11psi but also dramatically increase the potential for knock because of the exhaust restriction and at a certain point you just can't flow more exhaust and it planes off at that higher RPM where the exhaust flow is key. I think the issue with turbo sizing is everybody focuses on the compressor side. But in a lot of cases you won't find restrictions there You're going to find them on the exhaust side first.