Hi PAPA DALE,
Yeah you’re going to need more track.
You will need to purchase 2 packs of Bachmann item number 44829 assorted straight short sections;
http://www.bachmanntrains.com/home-usa/products.php?act=viewProd&productId=216And 1 pack of Bachmann item number 44801 11¼r curve sections;
http://www.bachmanntrains.com/home-usa/products.php?act=viewProd&productId=211You will
not use the straight sections included with your 90° crossing.
To make a figure 8 using the 11¼r and the 90° crossing you will need;
11.25r curves X 18
5 in. straight X 4
4.5 in. straight X 4
1⅛ in. straight X 4
90° crossing x 1
Each leg coming off your crossing will have 1 ea. of the straight sections listed.
Good luck