simulink model - source blocks

Hi,

I am working on the dynamic modeling of formula 1 cars in simulink at the moment, and I have an issue with inputs so I was wondering if anyone could help.
Basically, I need the slip angles (kappa and alpha) as inputs to my tyre model, I'm guessing the best method would be to use a signal input varying between -1 and 1 (rad). I've been playing around with all kinds of source blocks (eg sinusoidal, step or even 'from workspace' inputting the values as an array or structure), but nothing really does what I want, so I guess it all boils down to me not fully understanding how to set the properties of the input signal correctly. I want to basically restrict it to one period (in the case of a sinusoidal type input), and want the values to go from -1 to 1. Do any of you guys have experience with this type of modeling? I'm starting to get really frustrated, becasue I know my equations are correct and so are my input values on paper, I'm just getting ridiculous outputs that are completely nonsensical because I'm having this input issue.
Any help or tips would be very much appreciated.