EPA Report No:
EPA-AA-CD-85-1
Technical Report
Road Load Coastdown Testing of
Twenty seven 1984 and 1985 Model Year
Light-Duty Vehicles and Light-Duty Trucks
April 1985
Notice
Technical Reports do not necessarily represent final EPA
decisions or positions. They are intended to present technical
anaylsis of issues using data which are currently available.
The purpose in the release of such reports is to facilitate the
exchange of technical information and to inform the public of
technical developments which may form the basis for a final EPA
decision, position, or regulatory action.
U.S. Environmental Protection Agency
Office of Air and Radiation
Office of Mobile Sources
Certification Division
2565 Plymouth Road
Ann, Arbor, Michigan 48105
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INTRODUCTION:
This report presents coastdown test results on 27 1984 and 1985
Model Year production vehicles. Some vehicles were procurred
by EPA's contractor, Transportation Research Center of Ohio
(TRC), some were provided by their manufacturers. Testing was
performed by both TRC and manufacturers, some vehicles were
tested at more than one facility. This aspect of the test
program was identical to programs run previously. For further
information the reader should consult last years report:
Road-Load Coastdown Testing of Selected 1981 thru 1984 Model
Year Light-Duty Vehicles and Light-Duty Trucks,EPA
AA-CD-84-01.Inadditiontothecoastdowntesting,several
vehicles were evaluated to determine the dynamometer setting
which would reproduce the 5.5 to 45 mph time from the coastdown
test. The dynamometer procedure is described in the Office of
Mobile Sources Advisory Circular No. 55B, as is the coastdown
procedure.
RESULTS:
The test vehicle fleet is described in Table 1. Vehicles
numbered 1 through 24 were tested in previous programs and are
not included in this report. Coastdown test results are set
forth in Table 2, dynamometer adjustments for selected vehicles
are found in Table 3. Several vehicles did not meet
specifications set forth in the manufacturers application for
emission certification. This report does not address the
details of any discussions that have occured or of any
enforcement actions which are contemplated. EPA plans to
continue production vehicle coastdown testing in the future.
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TABLE 1
TEST VEHICLES
No.
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
Year
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
L984
1984
1984
Manuf .
Ford
Ford
Ford
Ford
GM
O1
CM
CM
Toyota
CM
CM
Honda
Ford
Ford
Ford
CM
Ford
CM
CM
CM
CM
CM
CM
Model
Esoort
LTD
Tempo
Ranger
Monte Carlo
Camaro
Chevette
Cavalier
Corolla
Blazer
Celebrity
CRX
Crown Vic.
LTD
Marquis
Chevette
Thunderbi rd
S. Blazer
S. Blazer
Chevette
Chevette
Chevette
Chevette
Body Style
3-Dr. Hatch
4-Door
4-Door
Pickup
2-Door
2-Door
4-Door
2-Door
2-Door
2WD
4-Door
2-Dr. Hatch
4-Door
4-Door
4-Door
4-door
2-door
2WD
2WD
4-dcor Hatch
4-door Hatch
2-door Hatch
4-door Hatch
Odometer
16,144
10,927
5,380
6,063
4,218
3,592
4,826
3,478
7,128
4,856
1,810
22. 218
9,551
10,006
14,053
5,633
20,060
3,422
4,767
4,858
6,302
6, 772
3,593
(2)
Weight
2180
3070
2600
2650
3350
3100
2140
2460
2300
3270
2900
1760
3830
3100
3090
2150
3120
3280
3240
2290
2290
2230
2310
Engine
1.6 L
3.8 L
2.3 L
2.0 L
5.0 L
2.8 L
1.6 L
2.0 L
1.6L
2.8 L
2.8L
1.3 L
5.0 L
3.8 L
3.8 L
1.6 L
3.8 L
2.SL
2.8L
1.6L
1.6L
1.6L
1.6L
Trans-
mission
A3
A3
A3
M5
A3
A3
A3
A3
M5
A4
A3
M5
A3
A3
A3
M4
A3
A4
M5
A3
A3
A3
A3
Tires
Fire. WR 165/80R13
Fire. 721 P185/75R14
Fire. WR P175/80R13
Fire. Dlx. Champ. P185/75RL4
UniR. Tig. Paw 195/75R14
UhiR. ER P205/70R14
Fire. Dlx. Champ. P155/80R13
Fire. Dlx. Champ. P175/80R13
Bridg. Wide 70 185/70SR13
Good. P205/75R15
Gen. Ameri-Way P185/80R13
Dunlop SP4N P165/70R13
Mich. X P215/75R14
Fire. WR-12 P185/75R14 M/S
Fire. WR-12 P185/75R14
Gen. Jet P155/80R13
Gen. Ameri-Way XT P195/75R14
Goodyear P205/75R15
Goodyear P205/75R15
Gen. Jet P155/80R13
Uniroyal P155/80R13
Uni royal P155/80R13
Fire. P175/70R13
Pressure
Front/Rear
35/35
30/35
30/30
35/35
35/35
35/35
30/30
35/35
27/27
35/35
35/35
35/32
31/35
30/35
30/35
30/30
30/30
35/35
35/35
30/30
30/30
30/30
30/30
Vehicle
Source
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
EPA
CM
EPA
GM
GM
GM
GM
GM
GM
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TABLE 1 (cont'd)
TEST VEHICLES
No.
(2) Trans-
Year Manuf. Model Body Style Odometer Weight Engine mission Tires
48 1984 Etord LTD 4-Door 4,059 3134 3.8L A4 Fire. P185/75R14
49 1985 Fbrd LTD 4-Door 589 3170 3.8L A3 Fire. P195/75R14
50 1985 Ford LTD 4-Door 593 3145 3.8L A3 Fire. P195/75R14
51 1985 ford LTD 4-Door 593 3160 3.8L A3 Fire. P195/75R14
1. Vehicles "numbered" 1 throught 24 were tested in previous years.
2. bfc> driver, with all instrumentation, 5th wheel down and off scale.
MANUFACTURER SUPPLIED VEHICLE
EPA
40
42
43
44
45
46
47
48
49
50
51
CROSS REFERENCE
Vehicle Number Manufacturer Vehicle Number
4T508
SU4046
SU4O01
1T583E
4T506
4T510
4T519
P854a01z
P421a01z
P422a01z
P431a01z
Pressure Vehicle
Front /Rear Source
30/35 Ford
30/30 Eord
30/30 Ford
30/30 Ford
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TABLE 2
OOASTDOWN TEST RESULTS
No.
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
Year
1984
1984
1984
1984
L984
1984
1984
1984
1984
1984
1984
1984
1984
1984
1984
Manufacturer
Ford
Fbrd
Ford
Fbrd
CM
GM
CM
a*
Toyota
GM
CM
Honda
Ford
Fbrd
Fbrd
Inertia
Model Wt. Class
Etecort
LTD
Tempo
Ranger
Monte Carlo
Camaro
Che vet te
Cavalier
Corolla 2-dr.
S Blazer (2WD)
Celebrity
CRX
Crown Vic.
LTD
Marquis
2750
3500
3000
3375
3750
3625
2625
2875
2625
3875
3250
2000
4250
3500
3500
(1)
Location
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
TRC
Ford
CM
GM
TRC
GM
GM
TRC
Ford
Fbrd
Ford
Fbrd
Track Coastdown Time
Application Vehicle
15.86
18.12
17.25
15.35
16.73
19.14
15.90
16.12
15.36
17.17
16.47
15.48
16.56
18.12
18.12
15.65
15.50
15.88
15.14
17.16
18.54
13.37
15.54
15.01 (3)
14.65 (4)
15.66
15.46
15.49
16.35
16.20
16.86
16.73
15.93
17.24
17.17
16.75
16.24
16.57
16.38
16.36
(2)
% Difference
1.3
16.90
8.6
1.3
-2.5
3.2
18.9
3.7
2.3
17.2
5.2
0.1
6.91
1 11.08
11.85
7.47
' 8.31
13.75
5.10
5.53
8.18
12.13
9.90
11.11
11.30
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TABLE 2 (cont'd)
OOASTDOWN TEST RESULTS
No.
40
41
42
43
44
45
46
47
48
49
50
51
Year
1984
1984
1984
1984
1984
1984
1984
1984
1984
1985
1985
1985
Manufacturer
CM
Ford
CM
CM
CM
CM
CM
CM
Ebrd
Pord
Pord
Pord
Model
Oievette
T-Bird
S Blazer (2WD)
S Blazer (2WD)
Chevette
Oievette
Chevette
Chevette
LTD
LTD
LTD
LTD
Inertia
Wt. Class
2625
3625
3875
3875
2625
2625
2625
2625
3500
3625
3625
3625
(1)
Location
CM
CM
TRC
CM
CM
TRC
CM
CM
CM
CM
CM
CM
Pord
HFL
HFL
HFL
Track Coastdown Time
Application Vehicle
15.90
19.14
17.17
17.17
15.90
15.90
15.90
15.90
18.12
18.52
18.52
18.52
15.10
15.08
14.80
15.36
15.20
18.20
15.58 (4)
16.86
15.81 (4)
16.94
13.60
13.84
13.38
13.04
16.142
15.809
16.055
16.274
(2)
% Difference
5.3
5.4
7.43
3.5
4.6
5.16
10.2
8.6
16.9
14.9
18.8
21.9
12.01
17.15
15.35
' 13.80
NOTES:
1)
TRC = Transportation Research Center, Marysville, Ohio
HFL = ford's Homestead Florida Test Facility.
CM = General Motor's Proving Ground in Milford, MI
Ford = Ford's Michigan Proving Ground in Itomeo, MI
(2) % Diff. = (Application Time/Vehicle Time - I) x 100
(3) Tested at night with the head lights extended. Sub-
sequent data from manufacturer indicated extended
head lights yeild a 3.3 % shorter coastdown time.
(4) With roof rack and deflector.
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TABLE 3
Preliminary Dynamometer Horsepower Settings
No.
38
39
48
49
50
51
Year
1984
1984
1984
1985
1985
1985
Manufacturer
Ford
Ford
Ford
Ford
Ford
Ford
Model
LTD
Marquis
LTD
LTD
LTD
LTD
Inertia
Wt. Class
3500
3500
3500
3625
3625
3625
Target
Time
16.14
16.36
16.14
15.81
16.06
16.27
Dynamometer
Location
FOB
EPA
FOB
FOB
FOB
FOB
Horsepower
Application
7.9
7.9
7.9
8.5
8.5
8.5
Setting
Vehicle
8.63
8.79
8.63
9.46
8.99
9.23
(2)
% Diff.
10.63
11.27
9.24
11.29
5.76
8.59
(1) EPA = Environmental Protection Agency's facilities in Ann Arbor, MI
FOB = Ford's facilities in Dearborn, MI
(2) % Diff =((Vehicle HP - Application HP)/Application HP) x 100
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