Well, I am not that much of a hardcore tuner, but I have been fiddling around with this crazy little vehicle for a few days. B-Spec Bob and I seem to agree that when we originally got the Vertigo in our garage that it looked a heck of a lot better than it drove. So since we haven't hired any technicians for our race shop, we grabbed a few hammers and tried to mash the buttons until we found something that worked better. Here's what we came up with (be gentle in response, Bob and I prefer driving, not tuning):
Spring Rate (F) 20.0 (R) 18.5
Ride Height (F) 65 (R) 68
Shock Bound (F) 7 (R) 7
Shock Rebound (F) 7 (R) 7
Camber Angle (F) 2.2 (R) 1.6
Toe Angle (F) -4 (R) +4
Stabilizers (F) 2 (R) 2
Trans Auto set 20
Downforce Full
Ballast: 120kg*
ASM 0
TCS 3
BRAKES 3/3
Bob and I worked this out at our test track (Midway) and it seemed to get about a full second better times than the settings in the link posted above (It has GT3 settings, which are really for a different car and as Zardoz mentioned, different scales. Although I do thank Mr. Zardoz much for his links and the awesome thread about the race car comparison. Kudos for those). Oh, and the ride height in the link sends sparks flying on various areas of several tracks. It might be a bit too low for Sarthe II as well (the wall-slam "bug"), but I have not tested that yet. Will try later. Now, as I say, I am not a really big tuner, but I figured that since the Vertigo is so different from GT3 "out of the box", that something needed to be said about GT4's version. After all, on paper it looks amazing, but when you first run it on your favorite track, you want to park it in a brick wall (if B-Spec Bob hasn't already done it for you) instead of taking it back to the garage.
I hope this helps! Let me know if you can massage these settings a bit to get better results. I am just beginning to find all of the fiddly little things that you can change for better or worse performance.
*Note: We like to do the Family Cup at Sarthe I with this set-up against the other high-end GT-based vehicles like the GT Spec-II, to keep things more competitive. Even though the HP and P/W on ths car look great, we actually add ballast to reach a weight of 900kg and keep the stock HP and go out and have fun against other similar looking cars. (I just find it weird to watch this car go against the LMP type vehicles.) So if you are maxing out the HP and keeping the stock weight, other settings might work a bit better.
Edited for spelling...goodness, I should wake up before I start babbling like this...