Did some testing tonight. Tried to approach things methodically, scientific. I took the MX-5 Miata '89 to Willow Springs Street Course on comfort soft tires. There is a nice little skid pad to the left, just after the free run begins.
Here is what I learned... nothing. Not a damn thing. Super frustrated with improving tuning over the stock settings. With stock settings I could only run around the white line of the skid pad at 41 mph. The outside front turned red and the inside front turned yellow.
Front Camber:
Tested 1.0, 2.0, 3.0, 2.5, 2.2
41 mph across the board. Though the speed was identical in each test, at 2.2 it was the easiest to hold the line. In reality there was so little difference in speed.
Rear Camber:
Tested 1.0, 2.0, 3.0, 4.0, 6.0
41 mph across the board. Identical speed result, but the inside rear began to turn yellow at 4.0 and almost turned red at 6.0. Again, very little difference in speed.
Rear toe from 0.20 to 0.00. Absolutely zero difference.
Added LSD from stock 0/0/0 to 8/14/7. Zero difference.
Ride height from 140/140 to slammed 75/75. This is the only setting where I could feel any difference. I went from fluttering between 40/41 mph to flutter between 41/42. Still, not very much improvement in my mind.
Kept her slammed and increased spring rates. Tested both half way across the slider and 3.4 across the slider. Zero difference.
Dampers from 1's up to compression at 6/6 and extension at 5/5. No change.
Then I decided to go crazy. I put settings to full soft front and full hard rear.
RH 75/160
SR 2.89/10.58
Dam Ex 1/10
Dam C 1/10
ARB 1/7
Cam 2.0/0.0
Speed did not increase one bit. Car rotation did not improve. The only difference is that the inside rear wheel could now turn red and the outside rear turned yellow. If I kept going, I could get both rear tires to break loose, but the car still would not rotate.
So tonight's conclusions. Mazda has paid PD enough to program Miata to handle perfectly and never spin out. What a waste of a night of tuning. I think I may need to test at higher speeds. Maybe try this same type of effort on Twin Ring Motegi Super Speedway?
I agree with everything here. I was playing around with the Clio RS 11 the other night and couldn't really get much out of it. One thing I did find is that it appears that Ride Height is backwards. I got the car to rotate more by max raise the front and slam the rear. I didn't try it with any other car. Maybe try it with the Miata and see what you think. I thought that the spring rates may be as well to, but I didn't get the chance to really mess with them.
I am going to try it with my VW GTI tonight to and see what I find.