So i recently did a engine swap on my z and in doing so added unorthodox racing pulleys. Every time i start the car cold i get a loud high pitch noise for about 20 sec and if i have my ac unit on it last longer. So i went under and tighten the belts a bit. Still does it. On cold starts when it goes away and then I turn my AC on the noise comes back. If there a certain tension to put on the tensioner fro the belts plz help its very embarrassing when impressing the ladies lol.

 

belts are too loose