Carsets
A great number of carsets has been created for Indycar Racing 1, some of them even quite recently. You can download them here.
ICR1 does supports multiple carsets in the same installation. When you drop a new carset into the CARS folder of your installation it should be selectable from Options => Carsets.
Tracks
Indycar Racing 1 only featured a small number of tracks out of the box. The other ones were available as track packs that could be bought separately. There was a pack for the Indianapolis race track and one with the other remaining tracks. Depending on where you got your copy of the game from, you may want or need to download and install some additional tracks. Those are available here.
Simply drop the track folders into the TRACKS folder of your ICR1 installation.
Australia - Surfers Paradise (Papyrus)
Australia (Surfers Paradise) is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadCleveland (Papyrus)
Cleveland is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadDetroit (Papyrus)
Detroit is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadElkhart Lake - Road America (Papyrus)
Elkhart Lake (Road America) is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadIndianapolis Motor Speedway (Papyrus)
The Indianapolis Motor Speedway track was released as a separate product by Papyrus.
DownloadMid Ohio Sportscar Course (Papyrus)
Mid Ohio Sportscar Course is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadPhoenix International Raceway (Papyrus)
Phoenix International Raceway is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadVancouver (Papyrus)
Vancouver is one of the tracks that was available in the track pack for Indycar Racing 1.
DownloadUtilities
Indycar Racing 1 did not receive many mods and updates because the modding community did not really exist back then, even the internet itself was barely getting started. Once ICR2 came out two years later its predecessor did not receive a lot of mods and updates anymore.
Paintkit (Papyrus)
This paintkit utility allows you to paint your own car and of course the ones of your opponents as well.
Download