I haven't tried the settings above, but here's my settings for black 787B, no turbo, chassis refrsh, or rigidity. It already handles well for me, so I didn't bother spending money on that stuff. These were made with mediums for harder compund tires cause I'm going to do Formula GT with it. I don't like testing with hards, so I never did. I'm sure they'll be fine for any tires though.
With the gearing, go from default, then set your auto gear, then do the final. It must be done in that order.
Spring rate: 15.5 | 16
Ride height: 65 | 65
Bound: 3 | 3
Rebound: 7 | 7
Camber: 2.5 | 2
Toe: 0 | -1
Stabilizers: 4 | 3
Brakes: 6 | 9
Gears:
1st 4.130
2nd 2.813
3rd 2.074
4th 1.640
5th 1.250
Final 2.315 for mediums-2.314 with hard tires
Auto 3
LSD:
7
32
14
Downforce is full.
Here's why you should change the final one tick for mediums or hards.
Hard tires:
2.314----------------------------------------2.315
400m-9.466----------------------------------400m-9.474
1000m-16.512--------------------------------1000m-16.522
top speed-232.88-----------------------------top speed-232.86
(doesn't hit redline, but will when drafting)
Medium tires:
2.314----------------------------------------2.315
400m-9.242----------------------------------400m-9.242
1000m-16.280--------------------------------1000m-16.276
top speed-233.35-----------------------------top speed-233.35
(doesn't hit redline, but will when drafting)