1975 Datsun 280z FSM - Spooled up Racing

values, it indicates that the engine is in
abnormal condition or the torque converter's
one-way clutch is slipping.
4. Others
(1) If the accelerating performance
is poor until vehicle speed of approximately
50 km/h (30 MPH) is attained
and then normal beyond that speed, it
can be judged that the torque converter's
one-way clutch is slipping.
Automatic Transmission
(2) If the torque converter's oneway
clutch sticks, vehicle speed can
not exceed approximately 80 km/h
(50 MPH) in the road test. In such a
case, the torque converter oil temperature
rises abnormally and so
special care is required.
(3) If the transmission does not operate
properly at all vehicle speeds, it
indicates poor engine performance.
ROAD TEST
An accurate knowledge of the automatic
transmission is required for an
exact diagnosis.
It is recommended that a diagnosis
guide chart with the standard vehicle
speeds for each stage of the up- and
down-shiftings be prepared. Measured
vehicle speeds are to be filled in the
adjoining column after each testing.
Also it is advisable to mount a
stopper for positioning the throttle
opening.
CAR SPEED AT GEAR SHIFT
Throttle opening
(-mmHg)
Gear shift
Car speed ** km/h (MPH)
Propeller shaft rpm
Kickdown
(0)
D l — D 2
D 2 - D 3
D 3 — D 2
D 2 - Dl
57 to 73 (35 to 45)
101 to 117 (63 to 73)
106 to 90 (66 to 56)
57 to 41 (35 to 25)
1,720 to 2,220
3,060 to 3,560
3,220 to 2,720
1,730 to 1,230
Half throttle
(200)
D l ->
D 2
D 2 -* D 3
D 3 —• D 2 or
D 3 -*
D 2 —
D x
Dl
13 to 30 ( 8 to 19)
47 to 63 (29 to 39)
38 to 22 (24 to 14)
23 Max. (14 Max.)
400 to 900
1,410 to 1,910
1,160 to 660
700 Max.
Full throttle
(0)
i 2 -
v
59 to 43 (37 to 27)
1,800 to 1,300
Minimum throttle
(450)
*2 -
! 1*
59 to 43 (37 to 27)
1,800 to 1,300
*1 Reduce the speed by shifting to "1" range from "D" range
(output shaft 2,000 rpm).
Note: Car speed can be calculated by the following formula;
2 x v x r x N P x 60
V =
R, x 1,000
where, V = Car speed (km/h)
Ni>= Propeller shaft revolution (rpm)
Ri = Final gear ratio
r = Tire effective radius (m)
n = The ratio of circumference of a circle to its diameter: 3.14
**: R,, = 3.545
r = 0.306
AT-51