I CANT CREATE SIDS WITH CURVED TRACKS

I wanted to create a SID, i can create one without any syntax erros, but when i load it up on the FMC, i get straight track lines, instead of curved ones, when i think they should be curved. The plane follows my intended path anyway, but i thought it would be more realitic with the curved tracks displayed on the navigation display. Here is the SIDSID BASSA2E RNW 11 KEEP HDG UNTIL 2 FROM NAVAID LTO TRK 179 INTERCEPT RADIAL 154 FROM NAVAID LTO FIX BASSACan anyone tell me what im doing wrong?