There's a couple related to NASCAR and stock-car racing. Another poster asked about them over in the Deals forum (a couple had been offered freebie, which that poster had missed), and
the thread is here, if you'd like to take a look.
There are also two murder mysteries by a couple named Jim and Joyce Lavene (not NASCAR, but regular non-branded car racing and truck rally stuff such), which were okay. Nothing particularly grabbing, but decently written and might be of more interest to people more genuinely interested in the sport instead of going through a themed reading phase like I was. I read them in paperback from the library, but they're available in Kindle editions.
There's also standard non-fiction stuff like
The Physics of NASCAR, an entire Harlequin romance line devoted to NASCAR, a Janet Evanovich series whose main sleuth Alexandra Barnaby acts a spotter for her race-car driving boyfriend and has other involvement with the sport (have not read, am waiting for the holds from the library).
And I rather liked a non-fiction book from the library which I got,
Driving with the Devil, which was apparently about the portions of the beginnings of stock car racing that kind of got lost in all the NASCAR image-making and quite interesting. But be warned, that one had some very distractingly bad typos in the ePub edition, though they might have fixed it by now. See if you can find a library copy first.