Skip to main content
Find a Lawyer

Code of Federal Regulations Title 40. Protection of Environment § 40.86.164–00 Supplemental Federal Test Procedure calculations

Current as of October 02, 2022 | Updated by FindLaw Staff

(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.

(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.

Back to chapter list
Previous part of code Next part of code
Back to chapter list

Cite this article: FindLaw.com - Code of Federal Regulations Title 40. Protection of Environment § 40.86.164–00 Supplemental Federal Test Procedure calculations - last updated October 02, 2022 | https://codes.findlaw.com/cfr/title-40-protection-of-environment/cfr-sect-40-86-164-00/

Read this complete Code of Federal Regulations Title 40. Protection of Environment § 40.86.164–00 Supplemental Federal Test Procedure calculations on Westlaw

FindLaw Codes may not reflect the most recent version of the law in your jurisdiction. Please verify the status of the code you are researching with the state legislature or via Westlaw before relying on it for your legal needs.

Was this helpful?

Search all Codes

Welcome to FindLaw's Cases & Codes

A free source of state and federal court opinions, state laws, and the United States Code. For more information about the legal concepts addressed by these cases and statutes, visit FindLaw's Learn About the Law.

Go to Learn About the Law

Latest Blog Posts

For Legal Professionals

Learn About the Law

Get help with your legal needs

FindLaw’s Learn About the Law features thousands of informational articles to help you understand your options. And if you’re ready to hire an attorney, find one in your area who can help.

Go to Learn About the Law

Need to find an attorney?

Search our directory by legal issue

Enter information in one or both fields (Required)

    More Options
    Copied to clipboard