[Code of Federal Regulations]
[Title 40, Volume 29]
[Revised as of July 1, 2007]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR610.43]

[Page 1006]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 610_FUEL ECONOMY RETROFIT DEVICES--Table of Contents
 
                Subpart D_General Vehicle Test Procedures
 
Sec. 610.43  Chassis dynamometer procedures.

    (a)(1) 1975 Federal Test Procedure. Vehicle exhaust emissions and 
fuel economy under urban driving conditions will be measured according 
to the Federal emission test procedure described in 40 CFR part 86, 
subpart B, which is known as the 1975 Federal Test Procedure ('75 FTP). 
However, the following modifications will be employed:
    (i) No evaporative emission loss, as specified by 40 CFR part 86 
need be measured (with the exception of devices modifying or 
disconnecting existing evaporative control devices in such a manner as 
would be expected to adversely affect their evaporative emission control 
performance).
    (ii) Vehicle preconditioning shall consist of operation of the 
vehicle through one (1) EPA Urban Dynamometer Driving Schedule. This 
preconditioning must be done at least 12 hours, but no earlier than 36 
hours before the emission test.
    (iii) While the test fuel must meet the specifications outlined in 
40 CFR part 86, fuel conditioning as specified for evaporative emission 
test procedures is not required.
    (b) Highway Fuel Economy Test. The test vehicle is fully warmed up 
at the start of the highway Fuel Economy Test which is ordinarily run 
immediately following the Federal Emission Test Procedure. The test 
procedure to be followed for generation of highway fuel economy data is 
that specified in Sec. 600.111.
    (c) Steady state tests. Constant speed, road load tests may be 
conducted to help give insight into operational differences and exhaust 
emission and fuel economy changes due to a retrofit device. Speeds 
between 0 (engine idling) and 60 mpg will be investigated, with a time 
period at each speed long enough to ensure that engine operation has 
stabilized.