I was wondering what lb spring comes in a new 38mm tial wg? the older style and I can't get mine to go over 20psi

 

You'll need to compare the spring chart with the spring you have. It will require opening the wastegate. Remember, the spring can take up to 2.5 times the pressure rate of the spring used. Example. if you have a 10lb spring, X 2.5 = 25psi...