[Code of Federal Regulations]
[Title 40, Volume 17]
[Revised as of July 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR86.164-00]

[Page 578-579]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)
 
PART 86_CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND 
ENGINES--Table of Contents
 
 Subpart B_Emission Regulations for 1977 and Later Model Year New Light-
 
Sec. 86.164-00  Supplemental Federal Test Procedure calculations.

    (a) The provisions of Sec. 86.144-94 (b) and (c) are applicable to 
this section except that the NOX humidity correction factor 
of Sec. 86.144-94(c)(7)(iv) must be modified when adjusting SC03 
environmental test cell NOX results to 100 grains of water 
(see paragraph (d) of this section). These provisions provide

[[Page 579]]

the procedures for calculating mass emission results of each regulated 
exhaust pollutant for the test schedules of FTP, US06, and SC03.
    (b) The provisions of Sec. 86.144-94(a) are applicable to this 
section. These provisions provide the procedures for determining the 
weighted mass emissions for the FTP test schedule (Ywm).
    (c)(1) When the test vehicle is equipped with air conditioning, the 
final reported test results for the SFTP composite (NMHC+NOX) 
and optional composite CO standards shall be computed by the following 
formulas.
    (i) YWSFTP=0.35(YFTP)+0.37(YSC03) 
0.28(YUS06)

Where:
    (A) YWSFTP=Mass emissions per mile for a particular 
pollutant weighted in terms of the contributions from the FTP, SC03, and 
US06 schedules. Values of YWSFTP are obtained for each of the 
exhaust emissions of NMHC, NOX, and CO.
    (B) YFTP=Weighted mass emissions per mile (Ywm) based on 
the measured driving distance of the FTP test schedule.
    (C) YSC03=Calculated mass emissions per mile based on the 
measured driving distance of the SC03 test schedule.
    (D) YUS06=Calculated mass emissions per mile based on the 
measured driving distance of the US06 test schedule.
    (ii) Composite (NMHC=NOX) + YWSFTP(NMHC) 
WSFTP(NOX)

Where:
    (A) YWSFTP(NMHC)=results of paragraph (c)(1)(i) of this 
section for NMHC.
    (B) YWSFTP(NOX)=results of paragraph (c)(1)(i) 
of this section for NOX.
    (2) When the test vehicle is not equipped with air conditioning, the 
relationship of paragraph (c)(1)(i) of this section is:
    (i) YWSFTP=0.72(YFTP)+0.28(YUS06)

Where:
    (A) YWSFTP=Mass emissions per mile for a particular 
pollutant weighted in terms of the contributions from the FTP and US06 
schedules. Values of YWSFTP are obtained for each of the 
exhaust emissions of NMHC, NOX, and CO.
    (B) YFTP=Weighted mass emissions per mile (Ywm) based on 
the measured driving distance of the FTP test schedule.
    (C) YUS06=Calculated mass emissions per mile based on the 
measured driving distance of the US06 test schedule.
    (ii) Composite (NMHC+NOX) = YWSFTP(NMHC) + 
YWSFTP(NOX)

Where:
    (A) YWSFTP(NMHC)=results of paragraph (c)(2)(i) of this 
section for NMHC.
    (B) YWSFTP(NOX)=results of paragraph (c)(2)(i) 
of this section for NOX.
    (d) The NOX humidity correction factor for adjusting 
NOX test results to the environmental test cell air 
conditioning ambient condition of 100 grains of water/pound of dry air 
is:

KH (100)=0.8825/[1-0.0047(H-75)]

Where:

H=measured test humidity in grains of water/pound of dry air.

[61 FR 54900, Oct. 22, 1996]