LOSI NASCAR — Box Stock
v1Summary of recent changes
Box stock spec (oval & on-road). Mirrors ThunderDome’s LOSI Nascar box stock rulebook, rev. 7/17/2026. "All decisions of the race promoter or ThunderDome management are final."
Spec sheet
- Notes
- Stock RTR, no option parts besides heatsink
- Motor type
- Spec brushed
- Motor turn
- N/A (brushed)
- Spec motor
- Losi LOS-1907 28-turn 380 (or ARRMA ARA390305)
- ESC
- Stock 25A brushed (IC2)
- Battery chemistry
- LiPo
- Cells
- 2S
- Max voltage
- 8.40V
- Spec tire
- Losi spec (LOS-1914/1937/3779)
- Tire additive
- Spec sauce only
- Min weight
- 945 g
- Body
- Losi/Pro-Line NASCAR bodies (precut)
- Chassis
- RTR Losi NASCAR / ZL1 Asphalt Late Model (unmodified)
1.Chassis Spec
RTR LOSI Nascar with stock body mounts, front and rear splitter, OR RTR LOSI ZL1 Asphalt Late Model with stock body mounts, front and rear splitter. Un-modified. No removing any parts. No heating or bending parts.
2.Weight Spec
Minimum 945g in race-ready trim.
3.ESC / Receiver
Stock SPMXE3125RX / Stock SPMXSE3325RX / SLT RX / 25A Brushed ESC IC2 plug.
4.Battery Spec
Stock SPMX142S30H2 Spektrum 1400 2S 7.4V Smart G2 30C lipo / Ovonic 1700 2S with IC2 plug / Ovonic 1400 2S with IC2 plug. MAX temp 90°F at tech table. 8.40 MAX VOLTAGE. Battery in stock battery box location.
5.Tire and Wheel Spec
LOS-1914 (medium) or LOS-1937 (soft) / LOS-3779 (medium) Asphalt Late Model. Sidewall glueing allowed.
6.Motor Spec
Stock LOS-1907 28-turn 380 or ARRMA ARA390305 28-turn 380 with original bullet plugs from LOS-1907 installed. LOSI Nascar 380 Aluminum Motor Heatsink LOS-1920 allowed.
7.Body Spec
LOSI Camaro / LOSI Camry / LOSI Mustang / Pro-Line 96 Monte Carlo / Pro-Line 90 Lumina / Pro-Line 96 Thunderbird / Pro-Line Dirt Late Model / Pro-Line 86 Monte Carlo / Pro-Line Tundra / Pro-Line F-150 / Pro-Line Silverado / Pro-Line Ram / Losi ZL1 Asphalt Late Model. All bodies are precut, no body trimming allowed. Body mounted at stock height and not lowered.
8.Miscellaneous
Shock oil & diff grease open. Motor fan can be replaced with any 25mm x 25mm fan. Stock springs, stock bearings, stock pinion, stock spur, stock servo & RTR radio only. No LOSI option parts allowed besides heatsink. All chassis screws must be installed.
9.Race Spec
2-4 minute heats – 60-250 lap mains (OVAL). 5 minute qualifiers – 5 minute mains (ON-ROAD).
10.Tire Sauce
SXT Black ONLY.