a fwd vehicle has the following data front axle weight 1750 lbs center
A FWD vehicle has the following data:
Front axle weight: 1750 lbs
Center of gravity height: 17 inch
Air drag coefficient: 0.32
Tire radius: 11.70 in.
Powertrain efficiency: 0.94
Max. Power @6000RPM: 138 HP
The manual transmission used for the vehicle has six forward speeds and the gear ratios are: first gear
(3.72), 2nd gear (2.31), 3d gear( 1.51), 4th gear (1.07), 5 gear (0.81), 6 gear (0.63). The engine WOT
output plot is given below:
Rear axle weight: 1550 lbs
Wheel base: 104 in.
Frontal projected area: 22.90 square feet
Roll resistance coefficient: 0.018
Traction coefficient: 1.0
Max. Torque @4500RPM: 132 ft.lb.
a) The engine RPM drops 662 (RPM) when a 4-5 upshift is made at a vehicle speed of 45 mph.
Determine the final drive ratio of the vehicle.
b) Determine the engine torque and the engine power when the vehicle is cruising at a constant speed of
65 mph on level ground in the 6th and 5th gear respectively.
e) Determine the maximum acceleration the vehicle can achieve in the 4th gear at a speed of 65 mph on a
d) What is the highest speed the vehicle can achieve in the 6 gear on level ground?
e) Redesign the 6th gear ratio for the highest vehicle speed possible based on maximum engine power.
f) Redesign the gear ratio for the lowest gear for the maximum gradability using a reservation
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