rrobb wrote:
It happened right as I let out the clutch going to second.
I wonder if it hadn't started to fail and the shift into second just finished it off?
cheapracer wrote:
You have some chassis issues going on there, either an ackerman issue or your RC axis angle might be too shallow.
The front KRC is 3" above the ground and the rear is 6". The rear used to be 4" but I added another adjustment.
When I built the car I thought I was careful making sure the steering points where correct. Your post got me second guessing myself so I went downstairs, clamped two pieces of tubing to the outside of each front tire, marked points 12" and 24" forward of each tire's leading edge, turned the steering wheel, and took some measurements.
Both sets of points were 64" apart*. That explains quite a bit like why the car was actually pretty good on a real track but not so much on tight autocross turns. I guess the stickier tires allowed for more weight transfer which minimized the negative impact of the inside front tire.
Time to design some new steering arms: good call CR. I probably won't get them done for the next event so maybe I'll just add a little more toe-out and see what happens.
*On the plus side, my front track is 56" and the tire has a section width of 8" so apparently the rest of my build tolerances were pretty good!