I made this plugin to emulate the delta split feature of iRacing. It displays a realtime delta against your best lap time of the session.
Here's a demo of (an old version of) the plugin in action:
Here's the original thread from the Studio 397 forums:
If you are happy with the plugin and want to show your appreciation, you can donate here.
Delta Best time plugin for rFactor 2 25
Displays realtime delta against your best lap time of the session