Of course, a lot depends on how fit you are ...
If you want to go faster, then you'll need to change to a
smaller Freewheel or a larger chainring (I'm presuming your
Schwinn Predator is a BMX bike)
...
ACS makes 13T, 14T, and
15T Freewheels. Try a 15T Freewheel, first.
You can replace the
chainwheel with a
110BCD spider and then install a separate chainring (
not an inexpensive undertaking). A larger chainring will probably necessitate a new/longer chain.
You can get BMX components from
www.danscomp.com if your local bike shop doesn't carry a wide selection of BMX components.
You just need to remember that drivetrain components can be either 3/32" (Road) or 1/8" (Track) compatible ... and so, you will want to maintain continuity between the chainring, Freewheel, and chain, accordingly.