legrunt

Been searching online, but can't find much since this isn't your typical track enthusiast car. Does anyone know what sort of differentials are used in this car? Open? LSD?

no1SomeGuy

GENERAL

OUTLINE

(a) A U661F 6-speed Super Electronically Controlled Transaxle (Super ECT) is used on AWD models.

(b) A gate type shift lever with boot is used.

(c) A multi-mode automatic transmission is used.

(d) A shift paddle is provided on F SPORT.

(e) A drive mode select is provided to select the drive mode (ECO, NORMAL, SPORT*1 or SPORT S/S+*2). In SPORT*1 or SPORT S/S+*2 mode, a higher level of responsiveness and a linear acceleration feel have been achieved.

• *1: Models without AVS
• *2: Models with AVS

(f) A differential pre-torque mechanism is used. Straightline stability and acceleration performance during periods of low load and low differential rotation when the vehicle is being driven normally are ensured.

(g) An ATF warmer is provided in the ATF cooling system.


GENERAL

OUTLINE

(a) A GF1A type transfer that is compact and lightweight is used on AWD models.

(b) A dynamic torque control AWD is used on AWD models.

(c) The dynamic torque control AWD is a compact, lightweight and high performance AWD system that optimally controls the torque distribution to the front and rear wheels using a transmission coupling assembly in the rear differential.

(d) The AWD system performs control in cooperation with the brake control system. The 4WD ECU assembly controls the drive torque distribution to the front and rear wheels in accordance with information received from the skid control ECU. These controls ensure a smooth acceleration and driving stability.


GENERAL

OUTLINE

(a) A compact and lightweight FD13AE differential with a transmission coupling assembly is used on AWD models.

(b) The transmission coupling assembly is controlled by the 4WD ECU assembly. The transmission coupling assembly controls the amount of drive torque transferred to the rear wheels.

SPECIFICATION

Rear Differential

Differential Type
FD13AE
Gear Type
Hypoid Gear
Differential Gear Ratio
2.277
Drive Pinion
No. of Teeth
18
Ring Gear
No. of Teeth
41
No. of Differential Pinion
2
Oil Viscosity
SAE 75W-85
Oil Grade
API GL-5
Oil Capacity
0.5 Liters (0.5 US qts, 0.4 Imp. qts)
Weight (Reference)
17.0 kg (37.7 lb)

batchelor

Great detailed response, though I didn't ask the question, good info to have!

no1SomeGuy

Was just copy/paste out of the feature manuals for the vehicle...hence the awful formatting.

Long and short, there isn't an LSD, they're open diffs front and rear with a clutch of sorts to connect the rear drive and some brake based assistance.

d8168055

Is there any indication when the AWD is engaged? Besides pressing the lock switch, which automatically cancels at 40 mph.

no1SomeGuy

Yes, all sorts of things it's enabled:

SYSTEM CONTROLCONTROL
FUNCTION
Start Off Control
Performs control which distributes drive force to the rear wheels to ensure traction performance when starting off and avoid the tight corner braking phenomenon*, which occurs during cornering.
Normal Control

• Performs control which distributes drive force to the rear wheels to ensure acceleration performance when driving straight ahead and cornering stability.
• When a stable driving condition has been determined, reduces drive force distribution to the rear wheels to improve fuel economy.

Lock Mode Control
When starting off in Lock mode, the maximum amount of drive force is transmitted to the rear wheels to improve driving performance on surfaces where it is easy for the vehicle to get stuck, such as sandy soil, snow-covered roads, etc.
Cornering Control
Uses pre-torque control, which is based on driver operation input, and yawrate feedback control, which is based on the vehicle status, to achieve the tracing performance desired by the driver.
Braking Control
When braking, cancels AWD to improve braking effectiveness.
VSC Cooperative Control
When accelerating during cornering on slippery surfaces, etc., the dynamic torque control AWD system and VSC function cooperate to perform control which achieves smoother acceleration and higher stability compared to previous TRAC and VSC functions. As a result, smooth acceleration during turning is made possible.

d8168055

Thanks, @no1someguy. Sorry if I wasn't clear, I was meaning to say visual indicators, maybe in the instrument panel? Is there a light or indicator that displays when the AWD system is engaged, say during a slip or hard acceleration?