To rename a track you have to do following steps:
Unpack the (in this case) a1ring2001.wad. Then rename the following files from 'a1ring2001' to for example 'sepang2001' inside the wad (in your case it's hungaroring2001 if I rememeber correctly):
maps\a1ring2001\a1ring2001.cfp
maps\a1ring2001\a1ring2001.col
maps\a1ring2001\a1ring2001.env
maps\a1ring2001\a1ring2001.gp4
maps\a1ring2001\a1ring2001.hze
maps\a1ring2001\a1ring2001.vcl
maps\a1ring2001\a1ring2001_pitlane.bin
maps\a1ring2001\a1ring2001_pitverge.bin
maps\a1ring2001\a1ring2001_track.bin
samples\crowddata\a1ring2001.crd
samples\reverbdata\reverb_a1ring2001.bin
rename the 'a1ring2001' folder to 'sepang2001', too.
Rename the .dat file by paying attention that the number matches the track (f.e.: Melbourne - s1ct
01.dat, sepang - s1ct
02.dat,.... Suzuka - s1ct
17.dat.)