Running a LRP DYNAMIC 10 4800kv and an LRP Flow WT, Turnigy 4600 shorty 90c, Car is as fast as the other ones. Motor gets a little bit warmer then the big cans, but still ok in a 6Min race. (Without fan at about 30° Celsius, astro track, straight about 65m, 14 teeth pinion). The wight is in the back as much as possible, spring is pink.
Car went great this weekend,
BUT:
just some little, hard "Bumps" about 10cm high and 40cm wide, and the "nose down" was dramatic. Changed oil in the back to 300cst: a little bit better. Moved the upper mount of the suspension inward: not better, reduced the travel: the problem was amplified.
Changed everything without the oil back and get 3. overall (just 5 competitors).
Planed my next changes:
Building some pistons 4x1,8, oil: more cst, building a "bump" for testing in the backyard.
You can see my car in this Youtube video:
http://youtu.be/Yjx15m04iRU
It's chassis slap, at least it was for me and some others... thicker oil, maybe slightly higher ride height and the issue is pretty much completely gone. A slower piston might help a bit too, but I just moved to 35wt associated oil in the rear and i'm happy, maybe lost a SMIDGE of rear handling, but not anything unmanageable.