I recently raced at the Electric Singapore International Challenge at the Marine Parade RCMC track! It's a fairly fast track with medium grip, and a bumpy surface. This is what I did to improve the car for these conditions:

• Softer springs than I've been running lately, which sacrificed a bit of initial grip, but improved bump handling.
• Harder shock oil to compensate for the hot ambient temperature (30+ degrees C).
• Active rear shock tower helped improve off-power steering and bump handling.
• Higher ride height to improve bump handling, as well as high speed steering.
• Upper links (together with the optional -1mm upper clamps) improved initial response, which made the car more direct.
• Upper links closer together (less sweep) improved overall bite. See setup sheet for more details.
• Hard lower arms instead of graphite improved mechanical grip and made the car more forgiving over bumps.
• More body rake (raised rear) to improve overall grip and high speed stability.
• More toe-gain (ARS link shim) than usual improved on-power stability, especially over bumps. As for the electronics, my Hobbywing Technology G3 ESC with the new 6.2.0.7 firmware worked perfectly in these demanding conditions!
• A rather low boost setting was preferable with a 4.5T motor on this track to not overshoot the corners too much in the infield, and to not overheat tires.
• I also geared down to 30T from my usual 31T, and changed from the optional 12.1mm rotor to the standard 12.3mm rotor, mainly to achieve a more aggressive brake feel, which was needed at the end of the straight.
• My Team EAM, Inc 6000 pack provided more than enough power for a 5 minute run, and at a low weight of only 238g, kept my CG super low, which means a nimble and responsive car handling.

Notes - In terms of upgrades Alexander's X4 is fitted with an optional 1.5mm Aluminium chassis, optional stiffer rear springs, optional Alu diff bearing holders, optional Ackermann plate and optional stiffer rear anti roll bar.