LeMans I used a Pesky Hybride Race Hards and ABS=0/ TCS=0
Not a hard win, once I got into a pattern.
Nurby 24
Gillett Vertigo with... Wet Tyres.
This was interesting.
If you pick ABS=0 or TCS=0 Tyre wear will be higher if you make mistakes and lock up into corners or spool up the rears with lashings of power out of slow corners...
Tips?
Get the RA menu set up so you can alter some settings during the race.
Brake Bias will help you find the sweet spot for the cars balance... and also let you soften the brakes if you want to run longer stints.
If things are going too hard - you can dial in some ABS and TCS to let you catch up - conversely if you have a big lead, you can turn off the ABS/ TCS etcetera to give the Ai a chance.
You can role play it out as mechanical gremlins that you have to endure until your next pits stop (When the pit crew can plug in the lap top and fix the brake servo or whatever.)
Tyres - get a range so you can match them to the pace of the AI cars... It is handy to have some Race Softs just in case you need to reel in the AI.
Mistakes happen and the insurance of some super softies to let you get the win will be useful if you are 23 hours into the race and a lap down.