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J SPEC TIME ATTACK
01/07/2019

J SPEC TIME ATTACK

Subaru

Subaru STI Sequential Gearbox R4 PLUS

6 speed

Kit includes

  • NEW in 2019!! Internal shifting piston for paddle shifting
  • Complete Sequential Mechanism
  • Input Shaft
  • Output Shaft
  • CNC Aluminium front plate case
  • 1st – 6th Gears with dog rings
  • Selector Rods
  • Selector Forks
  • Shifting Roller
  • Gear Indicator Sensor
  • LED Display Indicator
  • Complete Bearings and Needle Roller Bearings set
Contact us

Kit weight

29 Kg

Gearbox type

Sequential 6 speed

Torque rating

1000 Nm

Our advantages

  • The R4 Sequential gearbox kit has integrated an ultra lightweight aircraft grade aluminium CNC plate section that holds the new sequential mechanism and shafts.

    Complete also with upgraded high strength gears and shafts, billet selector forks and billet selector rods.

    Using the standard Subaru gearbox housing, the sequential kit is designed for the racer looking to have a quick shift sequential gearbox and keeping budget in mind. Kit is supplied in assembly position for easy installation into the gearbox. No modification required!

    It is also to purchase only the sequential upgrade kit for existing KAPS dogkit customers.
ISOTROPIC SUPERFINISHING on all parts as standard!

  • Fast facts
  • Gearbox type: 6 speed full sequential gearbox
  • Gear shift layout: R-N-1-2-3-4-5-6-R-N-1-2...
  • R4 Kit Weight: 29kgs
  • Total gearbox weight: 76kgs (10.5kilos lighter than a standard 6 speed STI gearbox)
  • Maximum torque: 100NM
  • Tooth profile: Straight cut
  • Shift performance: 40-50milliseconds

Gear ratios available

Subaru Sequential R4 6 Speed P1

GEAR Tooth count GEAR
ratio
output input
1st 40t 12t 3,33
2nd 31t 13t 2,38
3rd 27t 15t 1,80
4th 24t 17t 1,41
5th 24t 21t 1,14
6th 18t 19t 0,95

Subaru Sequential R4 6 Speed P2

GEAR Tooth count GEAR
ratio
output input
1st 40t 12t 3,33
2nd 31t 13t 2,38
3rd 27t 15t 1,80
4th 26t 19t 1,37
5th 19t 18t 1,06
6th 21t 25t 0,84

Subaru Sequential R4 6 Speed P3

GEAR Tooth count GEAR
ratio
output input
1st 40t 12t 3,33
2nd 30t 14t 2,14
3rd 27t 17t 1,59
4th 24t 19t 1,26
5th 21t 20t 1,05
6th 18t 20t 0,90

Subaru Sequential R4 6 Speed P4

GEAR Tooth count GEAR
ratio
output input
1st 38t 13t 2,92
2nd 33t 16t 2,06
3rd 28t 18t 1,56
4th 28t 23t 1,22
5th 21t 21t 1,00
6th 21t 25t 0,84

Subaru Sequential R4 6 Speed P5

GEAR Tooth count GEAR
ratio
output input
1st 38t 13t 2,92
2nd 33t 16t 2,06
3rd 28t 19t 1,47
4th 24t 22t 1,09
5th 19t 23t 0,83
6th 18t 28t 0,64

Subaru Sequential R4 5 Speed P6

GEAR Tooth count GEAR
ratio
output input
1st 40t 12t 3,33
2nd 31t 13t 2,38
3rd 28t 16t 1,75
4th 24t 18t 1,33
5th 26t 25t 1,04

Subaru Sequential R4 6 Speed P7

GEAR Tooth count GEAR
ratio
output input
1st 40t 12t 3,33
2nd 31t 13t 2,38
3rd 28t 15t 1,87
4th 26t 17t 1,53
5th 23t 18t 1,28
6th 24t 22t 1,09