[Donnchadh MacGarry]

I haven't raced this week yet but I was doing some practice and tweaking the setup today, should be attached below. I generally can run a low 1:03.XX although I can hit some 1:02.XX with a very good lap, I think I hit a 1:02.7 once. This time falls off as the tyres get worn though, the left rear goes into the red zone of wear after 14 laps but I think that's more track related then setup related. Compared to my Tor Poznan setup, I only made small changes to the alignment, gearing, ride height and put on bit more front wing.

Interesting to see how different Dominic's setup is compared to mine, as he is using much more toe, camber and aero downforce. I checked the results and my lap times seem to be quite comparable. Seems like my setup would be exposed in the twisty sections, but it would have the edge for the long straight when in drafting distance. Since I haven't raced yet, I couldn't say which one would be more preferable when in a close battle. Also interesting how he has tuned his setup for only 4 gears, where I use all 5. The cars loose some time in the gear shifts so I suppose using 4 might be as good or better if done correctly. I had tuned the gearing in the Audi VLN to not use top gear when I did one of the races at Chang last season as I felt changing gears lost too much time in that car.

Made a few more tweaks, setup attached below. 2nd, 3rd and 4th gear are slightly longer so I only need to use 5th on the long straight (I switch to 5th at about 195km/h). I can hold 3rd before and over the small hill at the end of S1 and then hold 4th to the end of the straight after without hitting the limiter. I slightly raised the ride height to avoid bottoming out, although I can hear that I still scrape the ground once or twice on the first and final turn, but I don't think I loose any time. Returned the toe to -5 like for Tor Poznan as I can hug the last corner easier with it. Don't forget in qualifying to reduce the tyre pressures by 1psi on all four tyres when using the softs.

With mediums and 20L fuel I can run in the mid to high 1:02.XX with this setup up to about lap 14. Then the left rear goes into the red zone of tyre life and my times drop into the 1:03.XX. 

With this car you really have to avoid sliding on the tyres as that will cost you alot of time and is incredibly easy to do. I try to brake early and then turn my steering wheel as little as possible into the corners so I can reduce the tyre slip angle. Then I can get on the throttle really early and power out of the corner with as little sliding as possible. 
I take the final turn flat out in fourth, where I start wide and then move in to hit the apex but then continue to hug the inside line even on exit as I find that quickest. If I turn the wheel slightly too much the tyres will slide, where I can loose at least a tenth or two and will be slower on the exit and all the way through the long straight making overtakes/defending harder. So if I mess up my entry a bit I don't try to change the steering wheel to hug the inside which would cause some tyre slide. Instead I hold my steering angle as before and run the corner slightly wider which is slightly slower but I should still have better exit speed for the straight and be less exposed there. 
In the windy bit at sector 1, you really need to think about the weight management of the car since there are relatively quick changes in direction as the car goes from right to left and right again before going over the hill. A setup like mine (although I pretty sure is true with any setup in this car) struggles with shifting weight from one side to the other quickly and the car can snap and spin with sudden changes in direction like this. I also run very little aero downforce which wouldn't help with overall grip in those sections. I've noticed a number of people are way too aggressive with late braking into some of the corners and have very little speed on the exit. For example, many people try to brake very late into turn 3 which is a right turn and have no speed on the exit, or worse they spin out. This means they are incredibly slow going around the left of turn 4 followed by the right over the hill of turn 5 and the straight afterwards which is a huge time loss. In that section you actually need to brake early and not aggresively as you don't want to shift the car weight too much. Then coast (you can use a small bit of throttle to balance the car and keep some speed) into turn 3 so you can have way more speed coming into turn 4. Since you are coasting the car's weight is much more stable, making it much easier to change direction when entering turn 4 and getting on the power again around the mid section of that turn. This means while you might take turn 3 slower, you take turn 4 and approach turn 5 at much higher speeds and save way more time. If I take turn 3 at too high a speed I generally loose at least 5 tenths of a second and am very likely to spin out as well. 
Same goes for turn 5 over the hill. Get the car to the outside making sure the car's weight has settled, break slightly if needed and coast (again you can use some throttle) your way over the hill. Once you feel the car's weight settle at or slightly after the peak get on the power. As before, try avoiding any sliding as it really hurts time here.

If you struggle in sector 1 (or anywhere else in fact), I definitely recommend watching Dominic ORourke's onboard lap that he puts up in his Onboard laps thread. Even though his setup is different, the driving line and pedal application is similar enough to what I try to do. He brakes very early for corners, coasts the windy section and gets on the power early where the car is not sliding much at all. I find watching a replay like that helps me decrease my lap time pretty much instantly, without needing to bang my head against a wall doing loads of laps.

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Thanks Dominic but could not get on with that set either, will try this one Donnchadh Thanks.

Just updated the setup again, so try the one that ends in v2.5 as I find I am more consistent and slightly faster with it.

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I won all five of my New Jersey races by using MacGarry's Tor Poznan setup with only changes to wings (F 7, R 5) and minor changes to tire pressure to keep the temps down (mediums were still in the red for the last handful of laps, though). I'm using all five gears.

Glad that has worked for you. A clean sweep, very impressive. I've been unlucky with traffic in my two races today which cost me dearly unfortunately.