Well, a turbo works a lot different. You are creating stresses on both sides of the motor--intake and exhaust. Air is being shoved in as the exhuast is pushed out, which spools the turbo to shove air back in...get it? SO, you would need a tight LSA so that the exhaust distribution is close to even with the pressurized intake air coming in. Not doing so would make the motor run like chit. Have you ever seen a turbo motor with a huge, nasty cam it it? Nope, didn't think so.
A S/C is a slight bit different cause it is belt driven and has nothing to do with the exhaust helping to build boost. A S/C can have a slightly wider LSA than a turbo because the exhaust is unpressurized and needs more of a free-flow on it's way out. You still need to have a decent amount of back pressure on the motor... S/C's would run fine with no backpressure since the boost is belt driven and it needs the exhaust to escape faster than the air coming in--given it is being boosted. But, a rule of thumb: Turbo cams should have a lowest of 115 LSA up to a stock 118.5 LSA (depending on motor). A S/C cam can have a lowest of 113 LSA to a 118.5 LSA. And an N/A cam can be anywhere from a reverse-split 108 LSA to a 118.5 LSA.