Tekin is a prime example of an RC manufacturer that uses its experiences on the track to develop improvements to its entire product line. The biggest benefactor of that process is their new flagship RSX speed control. Everything from the material used to make the case, to the way that the optional fan can be mounted, to the technology inside and how Tekin’s HotWire system interfaces with it has been optimized for better performance, and the overall package demonstrates Tekin’s attention to detail. Packed with refined technology to better handle the rigors of racing and anything that a backyard hero can throw at it, Tekin’s new RSX runs cooler and looks better than anything else they make – and that’s why it’s at the top of their range.
UNDER THE SCOPE
Even with its beefed up tolerance for hot modified power (that exceeds what the RS Pro could handle), Tekin intends the RSX as a racing unit for 1/10-scale vehicles – as clearly evidenced by the “4 lb. chassis” limit listed next to the RSX’s motor and battery limits on the spec charts. Two-wheel drive short course trucks, when fully outfitted, are right around the four-pound mark – and those are the heaviest vehicles that Tekin intends to be used with the RSX, effectively ruling out 4WD short course trucks, which are better outfitted with 1/8-scale speed control units and 4-pole motors.
Above: Tekin was so committed to the red/black motif that the circuit board is also red! Note the sensor port, which is hidden underneath the solder posts.
The striking aluminum case and diagonally finned heatsink of the RSX is only slightly larger than Tekin’s RS line, at 1.2 x 1.5 inches. The RSX uses the same additional capacitor as well, so it’s really no different to install than the RS or RS Pro – except for the sensor port, which is now underneath the solder posts, so you’ll need to consider that when determining where to tape it to the chassis and most likely plug the cable into the RSX before you fasten it into place. The optional fan shroud is included and bolts to the unit’s heat sink for further cooling, adding about a half an inch to its height, but may not be necessary in many applications. Among the reasons the sensor plug was moved is the new micro USB data/fan port, which is easily accessible and allows the RSX to be plugged directly into the HotWire unit without using the speed control’s receiver plug – a welcome change! The tall solder posts are back, and make it easy to install the battery and motor wires with a bit of handy solder work.
Right: The included fan is protected by a shiny red “X.” Cool!
The RSX comes with the required power capacitor, optional fan, and everything you’ll need for the install. Take your time when deciding where to tape it in place, and be aware of the sensor port!
SETTING UP THE RSX
Programming the RSX to work with your transmitter is as easy as ever, requiring one button push and a cycle through the trigger’s travel range to set neutral, full throttle, and full brake. However, counting LEDs to adjust the speed control’s seven QuickTune modes is a bit tedious. Tekin’s new Hot-Wire Android app makes it a snap! The app will work with all of Tekin’s speed controls and is one of this unit’s best selling points, along with the new high-voltage BEC that finally takes advantage of today’s 7.4V-ready servos. If you’ve got an HV servo installed, it will probably take you several runs to get used to the extra performance of those added 1.4 volts.
— Aaron Waldron
