Setup and Data for the Formula 3 on Spa in AMS2

Formula 3
The most interesting part on this pretty dated (2009) Formula 3 car surely is the differential, which allows you to adjust the car in all potential cornering phases. 

Here i dialed it in so that the rear would rotate on entry, but just about not step out too much, while on exit you will feel it gripping up and pulling itself more to the inside. Perhaps more downforce would be even better, but straightline speed is important here for the race. With more fuel, you'll likely want to check the balance and potentially counter the resulting oversteer with either a click of wing on the rear or lowering the rear ride height further. 

Interlagos
Long straight, fast and slow corners - the ultimate compromise. I've put it somewhere in the middle with neither more downforce or less drag resulting faster total lap times. The differential allows you to push into the slow turns without losing the rear, aim for late apexes in general. In fast turns a middle or even early apex might work as the car rotates significantly more on power. Track limits are very wide here, find the actual limit to have way wider entries and exits, carrying more speed than you thought are possible. Careful trailing is needed in the middle sector as the inside of the car is almost always unloaded.

Driving

• Initial braking can be harsh, but needs trailing off the brake right after as the downforce quickly drops
• unless you throw the car in too harsh the car will be stable to understeer when coasting - that means you want to be back on throttle as soon as you are off the brake and the car will keep rotating
• you shouldnt really apply so much throttle that the rear starts sliding. It can quickly be too much and you lose the car

Adjustments

• start with the differential if any behavior is not to your liking. Less coast degree for more stability into the turn. More power degree for less oversteer on exit
• remove front wing if car is too aggressive in fast turns for you 
• if slower corners are too sketchy, stiffen front roll bar (small impact) or spring (big impact)
• of course adjust brake bias to the front if car is difficult under braking, but I feel its already quite far forward

Fuel

In Q the car needs about 1.21 L per lap. Likely a little more in the race as the straights become longer. Calculating with 1.3 per lap should be safe. 

For the race I'm expecting the balance to be slightly forward with fuel, so perhaps already account for that with the changes above.