CFR > Title 40 - Protection of Environment > CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY > SUBCHAPTER C—AIR PROGRAMS (Parts 50–99) > PART 86—CONTROL OF EMISSIONS FROM NEW AND IN-USE HIGHWAY VEHICLES AND ENGINES > SUBPART B—Emission Regulations for 1977 and Later Model Year New Light-Duty Vehicles and New Light-Duty Trucks and New Otto-Cycle Complete Heavy-Duty Vehicles; Test Procedures (§86.101 to > 86.164-00—Supplemental Federal Test Procedure calculations.

86.164-00—Supplemental Federal Test Procedure calculations.

(a) The provisions of § 86.144-94 (b) and (c) are applicable to this section except that the NOX humidity correction factor of § 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 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 § 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.

Code of Federal Regulations

(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 )

Code of Federal Regulations

Where:
Code of Federal Regulations 610
(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.

Code of Federal Regulations

[61 FR 54900, Oct. 22, 1996, as amended at 70 FR 40434, July 13, 2005]