Mini 4WD Tuned Motors: Torque, Atomic and Rev Compared
The first motor upgrade on a Tamiya Mini 4WD should almost never be a Dash. Torque-Tuned 2, Atomic-Tuned 2 and Rev-Tuned 2 are the published step after the kit motor: more speed than stock, less current than a carbon-brush Dash, and three published personalities instead of one “fast” sticker. This page is the comparison the overview table only sketches — official numbers, what Tamiya says each motor is for, the PRO twins as separate SKUs, and when it is reasonable to skip this rung entirely.
Why the Tuned rung exists
A new kit gearbox still has moulding flash, stiff bushes and unseated mesh. A Hyper-Dash 3 dropped into that box turns friction into heat. The Tuned motors draw roughly 1.6–2.2 A instead of a Dash’s wider band, and give a new builder a motor that is fast enough to show whether the car actually rolls. All three need a separately sold pinion. All three are listed as compatible with Mini 4WD cars excluding Mini 4WD PRO, plus Dangun racers. Dual-shaft MS/MA/ME cars use the PRO Tuned SKUs, not these. Break the kit motor in first; the order is in the beginner roadmap and the motor guide.
The three official spec blocks
All figures below are Tamiya’s published ranges at recommended load on 2.4–3.0 V. They are comparison baselines, not a promise for the motor in your blister.
| Motor | Item | Torque | RPM | Current | Tamiya’s own use note |
|---|---|---|---|---|---|
| Torque-Tuned 2 | 15484 | 1.6–2.0 mN·m | 12,300–14,700 | 1.7–2.0 A | Acceleration; “minimal speed loss on slopes and turns”; technical circuits |
| Atomic-Tuned 2 | 15486 | 1.5–1.8 mN·m | 12,700–14,900 | 1.8–2.2 A | “Superb balance of speed and torque”; at home on any circuit |
| Rev-Tuned 2 | 15485 | 1.2–1.5 mN·m | 13,400–15,200 | 1.6–2.0 A | Highest RPM of the three; lowest torque band. Use the spec block — the English 15485 marketing sentence is a Torque-Tuned 2 paste error |
Read the table as overlapping bands, not as three isolated islands. Torque-Tuned 2 is the torque-biased end. Rev-Tuned 2 is the RPM-biased end. Atomic-Tuned 2 sits between them and is the default answer when you have not yet classified the course. Current draw is similar across all three; none of them is Ultra-Dash.
Match the motor to the course, then to the gear
A technical or 3D layout (tight corners, waves, jumps) usually wants the torque end: Torque-Tuned 2, and a ratio that helps the car re-accelerate after a landing rather than a 3.5:1 hunt for top speed. A layout with real straights can use Atomic-Tuned 2 or Rev-Tuned 2, still with a ratio you can test. Rev-Tuned 2’s extra RPM is wasted if the car never reaches that part of the curve before the next wall. Change the motor or the ratio, not both, and write down whether the car finished. That method is motor and gear matching and the motor chart. Do not copy lap times out of a yearbook; those times were measured on one official circuit with one setup.
PRO twins are different products
Torque-Tuned 2 PRO (15487), Atomic-Tuned 2 PRO (15489) and Rev-Tuned 2 PRO (15488) are dual-shaft motors for Mini 4WD PRO chassis. They are not interchangeable with 15484/15486/15485. If the kit is MS, MA or ME, buy the PRO name. If the kit is VZ, AR, Super-II, FM-A or VS, buy the standard name. Shaft family first, personality second.
When to skip Tuned and go to Light-Dash or Hyper-Dash 3
Skip this rung when the drivetrain already rolls free, you already know the course type, and the event allows a Dash motor. Light-Dash sits above Tuned RPM — its published 14,600–17,800 rpm band tops the Tuned motors’ 12,300–15,200, though Tamiya publishes no brush material for it — and Hyper-Dash 3 is the usual carbon-brush race motor. Neither is a substitute for cleaning mesh. If the car is slow with a kit motor because the gearbox binds, a Tuned motor will not diagnose that — see why the car runs slow and motor heat.
Frequently asked questions
Which Tuned motor should a beginner buy?
Atomic-Tuned 2 if you have not classified the track. Torque-Tuned 2 if the local course is jumps and tight stuff. Rev-Tuned 2 only if you already know the layout has straights that a Torque motor cannot use. There is no universal winner.
Are Tuned motors legal in Stock Class and BMAX?
Tamiya Stock Class and the current Basic-MAX GP FAQ both allow Dash motors, so the gentler Tuned motors are inside that envelope — provided the event uses those sheets. A local organiser can still restrict motors. Check the PDF. See race classes.
Do I need a new pinion?
Tamiya’s Tuned 2 pages all say the pinion is sold separately. Match the tooth count the chassis instruction specifies; do not assume the kit pinion is the right press-fit for a new can. Category: motors and gears and shafts.