You´ll need a short (~ 1 second), looped engine sound.
Take a look at your GS folder:

projects --> carlevel --> engine.wav

to get an example.

I´ll upload some sounds, just wait a minute.

Edit: Here you go: http://www.vulkanware.de/stuff/enginesounds.zip
Edit2: They are already looped - but you can change the charactaristics with Audacity if you want to.

Last edited by fogman; 04/23/09 12:07.
no science involved