Dirt Track Mechanic for iRacing is an app for car lovers. You can download this app and you may set up your late model, sprint car, and UMP modified vehicles using the dirt track setup guide. This app provides details on what you can do to improve your car. It may be on its machine or the body itself to make it look more presentable. 

Also, the idea came from Jeff Kendrick who provided the information on how to configure the cars for sim racing. You will surely enjoy this app so download it now for free. no sign ups needed!