Some tire tread patterns are designed specifically to reduce road noise, some are more aggressive for better wet traction. Your new tires may have a tread pattern where increased road noise was a compromise to achieve some other quality.
The scraping noise is not normal and the shop that installed the tires should be given the chance to check their work. In particular, it is real common on many cars for a metal brake splash shield to inadvertently get bent causing it to rub on the brake rotor. That is not a safety issue but it can be annoying. If that is identified as the cause of the noise, it will take the mechanic longer to walk all the way under the car than to fix the cause. It's just a matter of pulling the shield away from the rotor.
There are a number of other things that can cause similar noises but the common ones get worse when turning. Based on your description, I'm betting on a splash shield.
Tuesday, October 1st, 2013 AT 11:33 AM