Table 2

Comparison of Understeer Gradients
Measured at Different Facilities


Understeer (Model Year)
TEST FACILITY Firestone/
Dr. Guenther*
VRTC Ford
VEHICLE MODEL      
Ford Explorer      
w/SLA Front Suspension:      
4-Dr./4X2:      
w/Firestone OE Tires 2.04 ('96) & 2.20 ('00)   2.9 ('96), 3.1 ('97), & 2.2 ('98)
w/Goodyear OE Tires 1.84 ('96)    
w/Goodyear non-OE Tires 1.97 ('96)    
4-Dr./4X4:      
w/Firestone OE Tires 2.59 ('97)** 2.58 ('98)** 2.5 ('96)*** & 2.8 ('98)**
2-Dr./4X2:      
w/Firestone OE Tires 1.86 ('99)   2.2 ('97)
w/Twin I-Beam Suspension:      
4-Dr./4X2:      
w/Firestone OE Tires 3.26 ('93)   4.1 ('93)
4-Dr./4X4:      
w/Firestone OE Tires 5.13 ('93)    
       
Chevrolet Blazer      
4-Dr./4X2 4.29 ('96)   4.3 ('96)
       
Jeep Cherokee      
4-Dr./4X2 4.94 ('01)    
       
Jeep Grand Cherokee      
4-Dr./4X2 4.42 ('96)    
       
Nissan Pathfinder      
4-Dr./4X2 3.56 ('92)   2.66 ('95)

*  The understeer values in the table are the average of those measured in the clockwise and counter-clockwise directions. Also, Dr. Guenther tested the '96 model year, 2-wheel drive, four-door Ford Explorer with both Firestone and Goodyear tires, and separate entries are included in the table.

**  Vehicle equipped with "Command Trac" 4-wheel-drive system that was set in "4X4 Auto" (automatic 4-wheel-drive - normally in 2-wheel-drive (rear), but when slipping is detected at the rear wheels, the center differential engages to begin to apply drive torque to the front wheels) position.

***  Vehicle equipped with "Command Trac" 4 wheel-drive system that was set in "4X2" (2 wheel-drive) position.