I just drove few packs. The track was concrete with carpet jumps. First impression was that the rear was very slippery. So i took out the sway bar (because i haven't used it on my 501 either). Then it it was something like i thought how the car would handle with all the little differences over 501/511.. Gear diffs are of course quite different from the ball diffs.. After a few laps I noticed how consistent they are. So i was able to sweep nicely through a slippery but hispeed corner. The length of the car makes it easier too.
The included setup is propably made for higrip, I'm going to take out the limiters from rear and maybe try sway bar without the limiters. The weights in the rear were definitely needed for low grip. 1k in the rear diff and 10k in the front is propably quite extreme diff setting. But its easy to turn in and lots of steering out of the corner. With the gear diffs and extended chassis its quite easy to get hang of it. Its also easy to understand why people prefer so different diff oil weights. Many setups work and you just adapt to the way the car handles..
I managed to pop one ballstud out of the rear hub. I might switch to the almuminum ones. A longer ballstud screw might work also if i drill it through the hub. (Actually i might try this modification first)
Also i used the short motor screws as instructred in the manual. They were too short and my motor was loose after a few laps. And the other screw had stripped some aluminum from the motor. So i switched a bit longer screws. (I suppose most motors would work with about same length).
I feel there's work to do with the setup. But as it is now, its already faster and more _consistent_ than my old 501. 501 was had a little push but with other setups it was hard to drive smoothly out of the corners... Now with 503 i have more steering but its still easier to drive..
