I achieved a 1.14.910 with these settings
Set downforce towards middle for FRT & REAR to begin with, about 20 26 till your comfortable with the car then edge towards the settings above as you gain more confidence.
Be aware... you will make mistakes. I know I do with these settings.
Track Guide from willowspringsraceway dot com
Turn 1 -Turn One is a rather steeply banked 90-degree left, which ends the longest straight. It is a deceivingly fast turn taken in one gear below top in most cars. Late apex and get back on the gas very early remember it is banked. The right edge of the road is not visible until you pop out of the banking at the exit, making it tricky to use the entire road. This is a very important corner and an excellent place to pass on a late brake.
Turn 2 - A short straight precedes Turn Two: a fast 450-foot radius 200-degree right. Some banking and a slight uphill raise aid adhesion until the exit where the banking ends and the road levels out. Most cars like to run slightly inside of the middle of the road, apexing gently about three-quarters of the way into the corner. Spend some time balancing the car for this turn because a large percentage of your time is spent here. Too much under steer and you'll scrub speed and have to lift to apex; too much over steer and you'll have to ease off the power.
Turn 3 - In most cases the same gear is used from Turn One until downshifting for Turn Three the slowest turn on the track. Braking deep into Three is important because can you overtake here. An uphill well-banked 100-degree corner, Turn Three is again faster than it looks. A late apex and early throttle squirts you up the hill and into the difficult right-hand double apex Turn Four.
Turn 4 - Climb the hill and hug the right until the road starts to level. Now allow the car to move to the left side in preparation for a late apex because the turn tightens and heads steeply downhill.
Turn 5 - The right-hand jog preceding the left-hand Turn Five complicates the braking zone of Five. No matter how deep you go into five, the car is still loaded from the jog and traveling steeply downhill. Be willing to forego the perfect line into five; you can't get to the extreme right if you've gone in really deep. You can make up some of this lost ground by hanging a left front wheel in the dirt at the apex. At the exit the road starts uphill; you'll get some stick here so get on the throttle early.
Turn 6 - On the short uphill run to the right-hand Turn Six, don't bother getting to the extreme left before the entry. In a fast car, it is difficult and in a slower car completely unnecessary. In the middle of this fast turn, the road goes from uphill to downhill so you have to deal with an almost complete loss of stick for an instant. Short shift up and apex early to get most of the work done before the car goes light. In a faster car, it may take some time to gain confidence, but lose time here and you'll suffer all the way into Turn Nine.
Turn 7 - Seven is no more than a gentle bend in the straight. Stay left for the entry to eight unless you are trying to block someone's inside line into eight.
Turn 8 - In a fast car right-hand turn eight is one of those places where your right foot seems to have better sense than your brain. In most cars it is a no lift comer, but it's kind of scary at first. Enter Eight early and drive around the inside with no pronounced apex. Before the road straightens, let the car drift to the outside of the road.
Turn 9 - Leaving Eight you just have time to glance at the tach to check your top speed before entering one of the world's worst Turn Nine. This turn is very hard to get right, but essential for good lap times. It is a top gear turn in most cars, a 90-degree decreasing radius right turn with an exit you can't see until you get there. Enter from the left, but move right slightly in the early part to give yourself some room for error. There is a strong tendency to apex too early because it feels safer. Try to avoid this because you'll have to lift at the exit. Pick a reference that identifies the apex for you. You should be approaching full throttle before the apex in even the fastest car. The exit brings you to the outside of the pit straight and the end of your lap. Like any difficult track, Willow Springs requires lots of practice.