Sequential gearboxes

R4 PRO – 6 Speed sequential kit Subaru STi

Suitable for:

Subaru R4 PRO is upgraded successor of very successful R4+ model.

1000 Nm: Torque
6: Gears
6500 RPM: Revelations

Specification

The full sequential gearbox kit Subaru R4 PRO with integrated ultra lightweight aircraft grade aluminium CNC plate section that holds advanced sequential mechanism with the fastest and softest shifting on the market.

Engineered to fit the original Subaru case without modifications, but with weight reduction of 10,5 kg compared to the standard Subaru transmission. Complete also with upgraded high strength gears and shafts, billet selector forks and billet selector rods made of highest quality steel. All parts are REM isotropic superfinished.

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!

Why XSHIFT?

Major Advantages

Rated up to 1000 Nm
Fastest and softest shifting performance: 30-40 miliseconds
Components from the highest quality and specialy heat treated steel
All parts REM isotropic superfinished
Gear shift layout: R-N-1-2-3-4-5-6-R-N-1-2...
Total gearbox weight: 76 kg (10,5 kg lighter than a standard 6 speed STi)

Shifting and gear ratios

There are 7 main gear ratios available, that can be also combined with each other to achieve the most suitable ratio for your application. For final drive you can choose from two options.

Gear ratio	1	2	3	4	5	6
C1	3,33	2,38	1,80	1,41	1,15	0,94
C2	3,33	2,38	1,80	1,37	1,05	0,83
C3	3,33	2,14	1,59	1,26	1,05	0,90
C4	2,91	2,08	1,56	1,21	1,00	0,83
MR1	3,64	2,87	2,27	1,80	1,43	1,16
MR2	3,33	2,38	1,87	1,53	1,28	1,09
MR-N5	3,10	2,42	2,00	1,67	1,39	1,17
Final drive	10/39 (3,9)	10/44 (4,4)

Kit includes

Aircraft grade CNC aluminium plate
Complete sequential mechanism with dog engagement
Input and output shaft
Gears 1st – 6th
Shiting forks
Bearing and needle bearing set
Gear position sensor
Inlet/Outlet for oil cooler

Accessories

Together with the powerful Subaru R4 PRO sequential gearbox we can provide many performance accessories that helps you achieve top results on the track.

Stronger conversion kit for high torque transmissions
- Subaru +PLUS Transfer Set
Smart tools for converting your car to rear wheel drive or permanent 4 wheel drive
- Subaru STi Conversion Spool
Modern type of LSD with preload adjustment
- Subaru STi Front LSD
Upgraded electromagnetic coils for Subaru DCCD
- Subaru DCCD Coil

and many more...

Photogallery

Videogallery

Gear ratios calculator

Gear	T1	T2	ratio	RPM down	speed	speed down
1	12	40	3.33	-	61.3	-
2	13	31	2.38	1845	85.6	24.3
3	15	27	1.8	1593	113.4	27.8
4	17	24	1.41	1402	144.6	31.2
5	20	23	1.15	1208	177.6	33
6	18	17	0.94	1160	216.2	38.6

Calculation #1

Km / h

Mp / h

Gear count

Final drive

Gear ratio

Max RPM

Calculation type

Metric

Imperial (inches)

Custom

Tire width (mm)

Aspect ratio

Rim size

Pneu diameter (inch)

Pneu width (inch)

Rim size

Tire diameter

If you have choosen your configuration, please take a screenshot of this calculator and attach it to the configurator below.

Gearbox configurator

For prices and more info, please contact us down below.

Please fill in your details and as many information as possible about your car (power, race purpose). After sending your configuration we will contact you as soon as possible.

Name

City

Country

ZIP

Telephone

E-mail