I don’t know nothing about (man I start a lot of posts off with this disclaimer) ISO settings. But I play a lot with shutter speed when shooting moving cars. In sunny conditions I’ll set the shutter to 1/1000 and that’ll freeze pretty much everything. From there you can experiment with available light and aperture to get the preferred amount of blur; for example, you might want the car body to be crisp but the wheels still moving, so back off that 1/1000 to 1/640 maybe.
Bear in mind you’re taking advice from what is very much still an amateur, but an amateur who can fake it pretty good.
/off to do some light reading on ISO settings