turbo cars don't hustle until the turbo spools... thats just the nature of turbo. All you can do is get the turbo to spool faster.

Ways to spool a turbo faster are: smaller turbo, better turbo design (bearings and lubrication), higher compression (not gonna do a lot, and potentially dangerous), nitrous, and of course, more displacement.

Of those, the cheapest in the long run is a smaller turbo, but an appropriately sized turbo with better design is ideal.