Torpedo You'll need some acceleration/movement speed conditions and then only play the sound once while looping (i'm assuming you know how to trigger the sound only once versus continuously).
Driving sounds
If speed > 0 and < speed 100 and Not turning, Play soundSlowDriveLoop
If speed >= 100 and < speed 200 and Not turning, Play soundMediumDriveLoop
If speed >= 200 and < speed 300 and Not turning, Play soundFastDriveLoop
Driving sounds
If speed > 0 and < speed 100 and turning, Play soundSlowDriftLoop
If speed >= 100 and < speed 200 and turning, Play soundMediumDriftLoop
If speed >= 200 and < speed 300 and turning, Play soundFastDriftLoop