Ralph-- If you have very soft water, 1/3 of a cup of Ace (or Ariel, for that matter) may produce a lot of suds. I'd start with 1/4 cup. If your water isn't soft, then you shouldn't have any problems with 1/3 of a cup.
All like several Mexican detergents---Ace, Ariel and Viva; They're sudsy, but have great scents. I tend to use them in my TL more often than the FL, where suds isn't an issue.