Why not make an editor that'll let you adjust the various parameters as you play, then export them to a 'car setup' file - ie. like a particle editor. Once you find a nice 'feel' you just hit export.
In fact, I could quite easily modify my in-house particle editor to do this if you're interested, but I'd need the car code to integrate it :/
In fact, I could quite easily modify my in-house particle editor to do this if you're interested, but I'd need the car code to integrate it :/