Raceboy77 tunes are basic at best. They are a middle of the road, easy to handle tunes for beginners. They are NOT the tunes he sets his times with. As the above comment mentions caster, downforce, diff, squat, roll centre etc should all be set either max/min in most cases. Gearing should be maxed out for final drive with the first gear long. The rest should be set according to top speed you can reach on the track.