Setups
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Gearing
Stock gearing for the Mugen Seiki MBX8TR, with common pinions and their ratios.
| Pinion | Spur ÷ pinion | FDR |
|---|---|---|
| 12T | 3.83 | 17.63 |
| 13T | 3.54 | 16.28 |
| 14T | 3.29 | 15.11 |
| 15T | 3.07 | 14.11 |
| 16T | 2.88 | 13.22 |
| 17T | 2.71 | 12.45 |
| 18T | 2.56 | 11.76 |
Shaded rows are the pinions most 1/8 4WD truck setups run on the stock spur.
What pinion should I run?
Tell us your motor and track and get a starting pinion for the Mugen Seiki MBX8TR, with the range racers in the class run.
Get a recommendation →Shop pinion gears at AMain →What pinion gear should I use on the Mugen Seiki MBX8TR?
It depends on your motor and the track. In the 1/8 4WD truck class, racers gear by final drive ratio: 1800–2300 kV near 13.97. On the MBX8TR's stock 46T spur that is about 15T for 1800–2300 kV. Tight tracks gear down, open tracks gear up. For a starting pinion matched to your motor, use the So Dialed Pinion Recommender with the MBX8TR selected.
What is the internal ratio (transmission ratio) of the Mugen Seiki MBX8TR?
The MBX8TR has an internal ratio of 4.6:1. Final drive ratio = spur ÷ pinion × 4.6. With the stock 46T spur, a 12T pinion gives an FDR of 17.63 and a 18T gives 11.76.
How many teeth is the stock spur gear on the Mugen Seiki MBX8TR?
46 teeth. Changing the spur moves every pinion's ratio at once; most racers leave the spur and tune with the pinion.
Kit setup
Kit shock setup. Part numbers link to AMain.
- Front
- 600 cst
- Rear
- 600 cst
- Front
- 10,000 cst
- Center
- 10,000 cst
- Rear
- 7,000 cst
What shock oil does the Mugen Seiki MBX8TR come with?
Out of the box the MBX8TR runs 600 cst front, 600 cst rear (Mugen Seiki oil), on 6 x 1.3mm (#E2569) front, 6 x 1.3mm (#E2569) rear pistons. That is the kit setup; you will need to adjust it for your track conditions. The RC Setup App can help dial it in.
What springs does the Mugen Seiki MBX8TR come with?
The kit springs are 75mm 1.5mm 7.5T (#E0574) front, 86mm 1.6mm 9T (#E2581) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
What diff fluid does the Mugen Seiki MBX8TR come with?
The kit diff fluid is 10,000 cst front, 10,000 cst center, 7,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.
Setup Help
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