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Mitsubishi Evolution X. Manual - part 148

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

TSB Revision

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22B-5

SHIFT MAP
<NORMAL - UPSHIFT>

<NORMAL - DOWNSHIFT>

AC707187AC

100

150

200

Vehicle speed (km/h)

Throttle
opening (%)

AC707188 AC

100

150

200

Vehicle speed (km/h)

Throttle
opening (%)

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22B-6

DRIVE MODE

By the switching of twin clutch SST control mode switch, three
types of control modes, which are NORMAL, SPORT, and
S-SPORT (super sport), can be selected.

CREEP FUNCTION

With TC-SST, by intentionally making the clutch to
slip (half clutch), the creep driving can be performed
which is similar to A/T. Because this function allows
the forward and backward driving in low speed, the
driving becomes easier on congested road and when
parking the vehicle.

KICK-DOWN FUNCTION

For the overtakes on expressway and the accelera-
tion on upslope, when the accelerator pedal is
depressed suddenly, the gear is intentionally down-
shifted for one gear.
Depending on the driving conditions, the downshift-
ing may be performed with 2 or 3 gears skipped, or
the downshifting may be rejected.

AC705131

AC709659

TC-SST
controlled mode
switch

Mode

Control content

NORMAL

• This mode is best suited for the normal driving on normal roads, expressways, and

snowy roads.

• A consideration is given to comfort and fuel efficiency, and the control is performed to

shift gears smoothly at low engine speed.

SPORT

• This mode is best suited for sport driving.

• Compared to NORMAL, the control is performed to shift gears swiftly at high engine

speed. This mode enables driving that is characteristic of EVOLUTION, offered by the
shifting timing focused on acceleration, the deceleration by downshifting at braking, and
others.

S-SPORT

• This mode takes full advantage of the engine performance.

• Compared to SPORT, the control is performed to shift gears more swiftly at even higher

engine speed.

NOTE:

•

S-SPORT can be selected only when the mode switch is pressed and held for 3 seconds
or more when the vehicle is stopped or when the vehicle speed is low (approximately 10
km/h or less).

•

The gears are shifted swiftly with the engine running at high speed, a shock may be
accompanied by the shifting.

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

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TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22B-7

DESCRIPTION OF CONSTRUCTION AND OPERATION

M2224000300015

The TC-SST assembly consists mainly of the clutch,
shifting section, valve body, and TC-SST-ECU. The
valve body is controlled by TC-SST-ECU, and the
clutch and shifting operations are performed by the
hydraulic pressure from the valve body.

SHIFT MECHANISM

M2224000400012

Name

Structure and action

Shift
mechanism

Clutch

Two wet multiplate clutches are divided for the odd number gears
and even number gears, and each clutch is engaged and released
alternately.

Shifting section (Reverse,
1st, 3rd, 5th)

The odd number gear axle consists of the reverse, 1st, 3rd, and
5th gears, synchronizer, and two shift forks, and it is connected to
the clutch (for odd number gears).

Shifting section (2nd, 4th,
6th)

The even number gear axle consists of the 2nd, 4th, and 6th
gears, synchronizer, and two shift forks, and it is connected to the
clutch (for even number gears).

Hydraulic
mechanism

Valve body

The hydraulic circuit for feeding oil to each part of TC-SST
assembly is mounted, and the solenoid valve for changing the
circulating path and controlling the hydraulic pressure is equipped.

Control
mechanism

TC-SST-ECU

Incorporated into the TC-SST assembly. Controls the solenoid
valve based on various signals.

AC705143 AC

Shift fork (For 2nd speed
gear-4th speed gear)

Shift fork
(For 6th
speed gear)

Input shaft (for even number gear)

Shift fork
(For 3rd speed
gear-5th speed gear)

Shift fork
(For 1st speed
gear-reverse
speed gear)

Clutch
(For odd
number gear)

Even number gear axle

Odd number
gear axle

Transfer gear

Input shaft (for even
number gear)

Center differential

4th speed gear

Input shaft
(For odd
number gear)

Input shaft (For odd
number gear)

Reverse gear

1st speed gear

Clutch (for even number gear)

Output shaft

Transfer gear

Center differential

2nd speed gear

6th speed
gear

5th speed gear

3rd speed gear

Even number gear axle

Odd number
gear axle

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

TSB Revision

TWIN CLUTCH-SPORTRONIC SHIFT TRANSMISSION (TC-SST)

22B-8

The shifting mechanism of TC-SST assembly is
divided into two systems as the odd number gear
axle (reverse, 1st, 3rd, 5th) and even number gear
axle (2nd, 4th, 6th). Each mechanism is joined with
an independent clutch, establishing a structure with
which two 3-speed M/T mechanisms are combined.

WHEN IN P AND N RANGE

In the P range and N range, the 2nd gear and the
reverse gear are engaged beforehand with the two
clutches kept released.

AT STARTING

→ D RANGE, N → D RANGE)

Corresponding to the operations from P to D and
from N to D, the shift fork (for 1st

− reverse) is shifted

from the reverse gear to the 1st gear to engage the
1st gear. Then, the clutch for the odd number gears
is engaged to perform the 1st gear starting.

AC705587AD

Center differential

Output shaft

Clutch (For odd number gear)

Input shaft (For odd number gear)

Transfer gear

Shift fork (For 1st speed
gear-reverse speed gear)

1st speed gear

Odd number gear axle

Content .. 146 147 148 149 ..