I would also be concerned about vibration working the screws loose and also about corrosion if there is any moisture. Screw terminals don't do too well when exposed to weather. I have had a few projects that were mounted on fuel delivery trucks and I used standard header pins with locking ramp like Molex 22-23-2021. I have never received any feedback about them working loose. I'd expect higher vibration on a race car, so I would recommend using CPC connectors like these: http://search.digikey.com/us/en/product ... 5-ND/15602
That connector uses a locking ring to secure the cable to the socket. I really like them for passing cabling through enclosure walls.
CPC connectors are used in a lot of military and aerospace products and there is a huge span in cost and ruggedness. They can get a bit expensive once all the bits are added (plug, socket, pins, receptacles, cable shrouds, tooling, etc) but for reliability they're hard to beat.
If you don't have to pass cables through an enclosure, then rectangular locking header pins/sockets would be cheaper than going the CPC route and they work very well. Some high-vibration applications use a zip tie around the connector for extra security.