[Donnchadh MacGarry]

I adjusted my gearing slightly and found a really small amount but not worth posting because the change was so small. I tried Donnchadh's setup but the rear was not stable enough for me. I want to be aggressive on turn in and have the rear planted to let me do it but I felt I had to be too gentle with that setup. I think most of it is driver and finding a setup to match the style.

I used to casually drive the GPL mod (late 60's F1) for Assetto Corsa around the Charade circuit a lot before I joined SRS. Just found it a really fun combo and the track is just an amazing mod. It meant I grew a real tolerance for driving a car with the rear end sliding a lot. So I don't mind dealing with that in the Estonia 25, but it doesn't mean I'm quicker when its like that. With my setup, I was really trying to maximise my top speed on the long straights to make overtaking easier. I used just enough front wing to take the final corner flat out, but wanted to keep the wings as low as possible. However, this tunnel vision made me not identify that there could be a lot more to gain in sector 1 if I planted the rear more. Earlier in the week, I tried increasing the rear wing and tested it for only a few laps. I didn't really do enough laps to try to change my driving approach and see how I could improve and maximise my sector 1 time. Thus when I saw I was losing a lot of time on the straights in sector 3 giving me slower laptimes (I never hit a 1:02.XX at that time), I was too quick in saying it was hurting the car's potential. 
I also have a feeling I went a bit overboard with softening the front springs and ARB when compared to the rears. While it helps prevent mid/late corner understeer as the car leans on the front outside tyres more, from what I understand it actually causes some entry understeer and feels a little slow/drunk on turn in. Overcorrecting this entry understeer by increasing the wheel angle causes the mid/late corner oversteer and so the rear of the car slides out which can be hard to deal with and easily loses time and speed. The soft fronts also makes left-right/right-left direction changes harder to do quickly as the front is slower shifting the weight from one side to the next. Since the rears are doing it way quicker, the car can feel like an pendulum, making it easy to snap and spin out. This is why I was stressing in my earlier post to not to overturn the steering wheel with my setup and to really pay attention to the weight balance of the car. I made this mistake really badly in my setup for the ASR F1 1991 race at Okayama, it was so hard to manage the car in that race and I lost so much time trying to drive cautiously. 

I had spare time this afternoon and decided to really test the setup you put up and compare how it felt to mine. I made minor tweaks to the setup you put up. I changed the gearing to match mine. I raised the ride height to be 7 on all four corners to eliminate most of the bottoming out. I lowered the tyre pressures on both left tyres by 2psi, although I noticed during my stint I should have lowered the LF by 3psi and LR by 4psi to get to the ideal pressures. I really liked your setup with these tweaks, the car is so planted and I could really attack sector 1 especially. The car felt more reactive and pointy, but also more stable and I felt I was less likely to slide and lose time. Your adjustments to suspensions, dampers, alignment and aero made weight management easier to deal with.

I will make an excel sheet later today/tomorrow comparing stints. I have already driven the stints but I haven't collected the laptimes properly yet. I know its a bit too late for this track, but I think it will be interesting to see regardless. I'm also going to use Steen's modification of a FW=7 and RW=5, although I applied that to my NJMP setup and not the Tor Poznan setup as I feel that the gearing and ride height needed the adjustments I made as well. I was a bit tired trying Steen's edits, so I made a few small errors in that stint, which might have increased the average that I could potentially do by a bit, but not by anything crazy.   

As a brief synopsis I found in general I was about 0.2s - 0.3s quicker with your setup. This came from the first half of the lap where I would decrease my lap time by 0.4s-0.6s, but then my setup recovered some of the deficit in the second half as it had less drag, reaching higher speeds on the long straights. I also think your setup felt nicer as the tyres wore out and I think I didn't lose as much time each lap as the stint progressed, but my comparison later should confirm that. Steen's modifcation unsurprisingly felt like a halfway house between my setup and yours. Quicker then mine but slower then yours in the twisty first half of the lap and slower then mine but quicker then yours in the second half on the straights. Of course results might vary depending on a person's driving style.

While I believe your setup is the quickest, I think it would make an interesting race having two evenly matched drivers where one uses my setup and one uses yours. If the driver using mine got ahead, they might be smart and skillful enough to not be overtaken in sector 1 and then would not be as exposed from the slip streaming car behind on the long straights due to having the higher top speed. Conversely if the driver using yours got ahead, they might always make up so much distance in the first half, that the driver in mine could never quite be able to catch up in time to make a move before the end of the straights. Sort of like what you mentioned (or was it Simon) with the VRC FW31 at Spa when comparing your setup with Marco's.