It's been a few months, so I thought I'd update this thread with my track impressions. I have attended 5 track days since my installation (2 @ Infineon, 3 @ Laguna Seca), so have had enough track time to post some proper impressions.
Please also refer to my thread here for some info (includes VIDEO!):
http://www.e90post.com/forums/showthread.php?t=347748
In general, the setup's (KW V3 w/ Swift Springs & Wavetrac LSD) greatest contribution to my track experience has been in the confidence it inspires; specifically, the lack of excessive body roll, and the elimination of that 'floaty' feeling.
For those who have been to Laguna Seca, downhill turn 9 into 10 is pretty fast. On stock sport suspension, going fast and then bringing it into the apex can be VERY unnerving, because of how floaty the car feels at speed. And if the traction control triggered while experiencing this floaty feeling...omg, I'll leave it to your imagination how scary that was to me. Floaty w/ little jerks as the traction control kicked in was NOT a good feeling to have when you're pulling a fast downhill turn at speed.
http://www.mazdaraceway.com/pages/Track_Map
After my suspension mods, that was no longer the case. Bringing the car into the apex felt so natural, and controlled. There was no body roll. No more floaty feeling. And if I broke traction to the point where traction control kicked in, it was very controlled. No scary abrupt jerks anymore. Just a comfortable, confidence inspiring turn. Wow, what a world of difference. Turn 9 into 10 is now one of my favorite segments!
Because of this, I can now take turn 2 much faster as well. Imagine me driving like a grandma down the screaming straight coming into turn 2 because of the stock sport suspension. Man, talk about braking super early and making sure you're not carrying excess speed into the turn! After the suspension mods, turn 2 is SO much fun now. For this turn, the video is definitely the best descriptive. Please check it out in the above thread.
QUESTION:
Understeer?
It's a known fact that our cars understeer by a lot. Adding the Wavetrac LSD had the biggest impact in addressing this. While I was running this setup, I did not feel understeer was a major concern, because the car was definitely greater than my driving ability.
So for those of you deciding on what suspension mods to do, unless you're an expert driver, I would say get the LSD first to greatly reduce understeer and not worry again about this until later.
I added this little blurp because I just did the M3 Front Conversion, which greatly helps with understeer. I will post my impressions later, so as not to take away from this update. I have not had enough seat time yet, and no track time with this new setup.