NIS - Tacoma Raceway

For Round 4 of the NIS, I dialed in my RC10 B7 (2WD) and B74.2 (4WD) for for Tacoma R/C Raceway's high-bite clay track. Here's a breakdown of my setup choices and how the two cars compare!

Front-End AdjustmentsRide Height & Camber ** B7: 16mm, -1.5° camber ** B74.2: 17mm, -1.5° camber

Why? Lower ride height on the B7 adds steering & grip, while a slightly higher ride height on the B74.2 keeps it balanced under acceleration.

Steering Geometry & Link Position ** B7: Bellcrank “Up,� 1mm bump steer ** B74.2: Steering link at +3mm

Why? The B7's bellcrank smooths out cornering, while the B74.2's link position makes handling more consistent on power.

Caster ** B7: +2.5° kick-up ** B74.2: 9° caster blocks

Why? The B7's kick-up improves turn-in & bump absorption. The B74.2's 9° caster boosts stability under braking & acceleration.

Rear-End Adjustments Ride Height & Camber ** Both Cars: 17mm, -2° camber

Why? Identical settings for better grip & control on high-bite clay.

Ballstud Mount & Link Spacing ** B7: Standard rear link ** B74.2: Vertical ballstud, 4mm rear spacing

Why? The B74.2's lower roll center increases rear grip, keeping the back end planted in tight turns.

Anti-Roll Bars ** B7: None ** B74.2: 1.3mm rear & 1.2mm front

Why? The B7's flexible chassis creates natural grip, while the B74.2's anti-roll bars reduce chassis flex for more predictable handling under power.

Drivetrain & Differentials Diff Oils ** B7: Ball diff (smooth power delivery) ** B74.2: 15k (front/rear), 200k (center)

Why? The B7's ball diff keeps things consistent on tight tracks, while the B74.2's 200k center diff balances power for better stability.

Slipper Clutch ** Both Cars: Octalock 78T spur

Why? Smooth & consistent power transfer through the drivetrain.

Shocks & Suspension Shock Oils & Pistons ** B7: ** Front: 35wt, 1x1.5mm + 2x1.6mm pistons ** Rear: 32.5wt, 3x1.7mm pistons

** B74.2: ** Front: 35wt, 2x1.8mm pistons ** Rear: 32.5wt, 2x1.9mm pistons

Why? The B7's softer rear setup adds grip, while the B74.2's stiffer pistons keep it planted through rough sections.

Springs & Compression ** B7: AE 1.9 (Front), AE 1.8 (Rear) ** B74.2: AE 2.0 (Front), AE 1.9 (Rear)

Why? Softer springs on the B7 improve grip, while stiffer springs on the B74.2 reduce chassis roll & improve stability.

Tires & Upgrades Tires ** Both Cars: JConcepts Smoothie V2 (Silver Compound, Black Foams)

Why? Maximum grip on high-bite clay with black foams for better support & bump absorption.

B7 Upgrades** JC Carbon Towers & Side Guards ** AE FT Hex Adapter (adjustable track width) ** JConcepts Turnbuckles (lighter & stronger) ** HRC Rear Hubs (stability) ** -4 JC Chassis (more precise & responsive)

B74.2 Upgrades** ProTek RC Carbon Side Rails (lighter, strong) ** JC Wing (better rear-end stability) ** Kashima Chrome Shafts (smoother shock action)

Body Choice & Electronics Body Choice ** B7: JConcepts F2 (low-profile, aggressive steering) ** B74.2: JConcepts S15 (stable, balanced downforce)

Why? The F2 body improves agility, while the S15 body enhances stability at high speeds.

Electronics** ESC & Motor: Team Powers V5 7.5T (2WD), 160T servos ** Battery: Protek 4800mAh, FH5 receiver ** Servo: Team Powers V5 servos – precise control ** Bluetooth Module: TP Bluetooth module for easy ESC tuning

A. Beauchamp

Source: A. Beauchamp