GRK RWD Setting Memo

07/20/2015 at 12:01 pm

Finally got around to installing a multi link rear suspension using left over WUN parts I used to run in the front. I liked both bump in and out so I’ll have to do further testing. I’m also liking the high lever ratio in the rear, but also tried mounting the shocks to the knuckles but that didn’t feel good. Small modification to the front Ackermann made the biggest change though. Car now picks up speed pretty quick so I can keep up with CS running the same tires.

GRK

Surface: Concrete (GGT)

Front

Tire: T-Drift (Nitto Tire Pattern)
Offset: 3mm
Hex: 4mm + 1mm Spacer

Height: 3mm? (With Body)

Damper: Kazama DG5 (TRF)
Oil: Yokomo 700
Piston: 1mm x 3
Spring: HRC 9.5 (5.5 N/mm)
Spring Retainer: 2mm down

Knuckle: Tatsuken v2 (A1)
Upper Arm: Tatsuken v2
Lower Arm: Tatsuken v2
Toe: 0-1 Out
Camber: 7
Caster: 7.1+ (Due to spacer under FF block)
KPI: 8
Trail: +0.85

2mm spacer under FF block.

Removed a 2mm spacer in the rack. Wheels open up more now at lock.

Removed a 2mm spacer from the rack. Wheels open up more now at lock.

I run the RC Art bumper because it weighs less than the stock one.

I run the RC Art bumper because it weighs less than the stock one.

2mm under FF block for more pitch and caster.

2mm under FF block for more pitch and caster.

GRK RWD

Rear

Tire: Vertex V-Zero
Offset: 6mm
Hex: 4mm + 1mm Spacer

Height: 5mm? (With Body)

Damper: TRF HL
Oil: Yokomo 1000
Piston: 1mm x 3
Spring: HRC 11.25 (4.5 N/mm)
Spring Retainer: 2mm Down

Hub: WUN GX Knuckle (Rotated sideways)
Lower Arm: WUN Y Arm
Toe: 0? (Variable toe)
Camber: 2

Differential: Yokomo Ball Differential (Very loose)

2mm spacer under RR block. Rear set up for bump in.

Rear multi link setup for bump in.

Rear multi link setup for bump in.

Knuckles are mounted this way to get the tie rod angle I wanted.

Knuckles are mounted this way to get the tie rod angle I wanted.

GRK Rear

Other

Servo: Futaba BLS551 (EPA 100)
Gyro: D-Like Real Dri Gyro (Gain 70+)
ESC: Acuvance Tachyon (Turbo + Boost)
Motor: Acuvance BS Dual 10.5T
Spur: 48P 74T
Pinion: 48P 18T
FDR: 14.9

HRC Bane

GRK Weight