UN R83 Supplement 3 (08 series) · UNECE Regulation No. 83 (ECE R83) — Uniform provisions concerning the approval of vehicles with regard to the emission of pollutants according to engine fuel requirements.
UN R83 — Supplement 3 to the 08 series of amendments
Supplement 2 → 3
- What changed
- References to the UN Regulation on RDE now give its number, 168, instead of “[xxx]” or a similar mark.
- Annex 1 has a new item 3.2.1.3. for the engine capacity in cm³.
- Under Annex 8, paragraph 5.2.6., the test can start following the dynamometer manufacturer’s recommendations if frictional losses can be stabilized without warming the dynamometer.
- Why
- The test report must specify the engine capacity, but the template of the manufacturer’s information document in Annex 1 did not have it.
- The text in the Regulation no longer represents the operation of modern chassis dynamometers.
- The proposal aims to update the dynamometer preparation requirements ahead of a Type 6 test, in line with Annex 13 of UN GTR No. 15.
Q1What changed13 changes
Number of the UN Regulation on RDE
References to the UN Regulation on RDE now give its number, 168. Before, the text gave this number as “[xxx]”, “[XXX]” or “[xxx*]”. For example, in Annex 4, ISC testing with the RDE test must be performed in accordance with UN Regulation No. 168 on RDE. The other words of these provisions do not change.
Engine capacity in Annex 1 (item 3.2.1.3.)
Annex 1 has a new item 3.2.1.3., “Engine capacity”, in cm³. A new footnote to this item says that the value must be calculated (π = 3.1416) and rounded off to the nearest cm3.
Test start without warming the dynamometer (Annex 8, para. 5.2.6.)
Paragraph 5.2.6. of Annex 8 (Type 6 test) has new text. If frictional losses of the dynamometer can be stabilized without warming the dynamometer, the test can start following the dynamometer manufacturer’s recommendations. The manufacturer must provide documentation on the validation of the systems upon request of the responsible authority. Paragraph 5.2.6. also limits the time between dynamometer warming and the start of the emission test. The limit is 10 minutes if the dynamometer bearings are not independently heated, and 20 minutes if they are.
Q2Why it changed
- Proposed by
- Experts from the International Organization of Motor Vehicle Manufacturers (OICA)
- Working party
- GRPE, 92nd session (March 2025)
Reasons
The Technical Services issue a test report in accordance with Annex 1 – Appendix 1. Point 1.1.2. of this report must specify the engine capacity of the vehicle type. This information was missing from the template of the manufacturer’s information document in Annex 1.
Sources (2)
“Within point 1.1.2. of the test report issued by the Technical Services in accordance with Annex 1 – Appendix 1, the engine capacity of the given vehicle type shall be specified.”
“However, this information is missing from the template of the manufacturer’s information document given in Annex 1.”
The text in the Regulation no longer represents the operation of modern chassis dynamometers. This was recognized in the development of Annex 13 of UN GTR No. 15, and a fitting text was developed.
Sources (2)
“The text in the Regulation no longer represents the operation of modern chassis dynamometers.”
“This was recognized in the development of Annex 13 of UN GTR No.15 and a fitting text was developed.”
According to the proposal, the text from UN GTR No. 15 should be included as an alternative in UN Regulation No. 83.
Source
“The text from UN GTR No. 15 should therefore be included as an alternative in UN Regulation No. 83.”
The proposal also makes some minor editorial corrections. Its justification lists the replacement of [xxx] with the number “168” for the UN Regulation on RDE.
Sources (2)
“This document introduces the engine capacity within the information document and some minor editorial corrections.”
“Replacing [xxx] with the number “168” for the UN Regulation on RDE.”
Document trail
- 2025-01ProposalECE/TRANS/WP.29/GRPE/2025/8Proposal by the experts from OICA on dynamometer preparation
- 2025-01ProposalECE/TRANS/WP.29/GRPE/2025/10Proposal by the experts from OICA on engine capacity and editorial corrections
- —Working party adoptsECE/TRANS/WP.29/GRPE/92GRPE session report, paras. 9, 11 and 16 and Annex VII
- 2025-08Sent to WP.29ECE/TRANS/WP.29/2025/98Text that GRPE sent to WP.29 and AC.1
- 2025-11WP.29 adoptsECE/TRANS/WP.29/1188Adopted at the 197th session (session report, para. 110)
- 2026-06-04In forceC.N.217.2026.TREATIES-XI.B.16.83UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Give the engine capacity in cm³ under item 3.2.1.3. of Annex 1.
- Calculate the engine capacity with π = 3.1416 and round it off to the nearest cm3 (new footnote to item 3.2.1.3.).
- Change references to “UN Regulation No. [xxx] on RDE” in your documents to UN Regulation No. 168 on RDE.
- Be ready to give validation documentation for the systems upon request of the responsible authority (Annex 8).
Component supplier
- Give manufacturers the engine capacity, calculated with π = 3.1416 and rounded off to the nearest cm3 (item 3.2.1.3.).
Technical service / Approval authority
- Check that the engine capacity in cm³ is given under item 3.2.1.3. of Annex 1.
- Be ready for test starts following the dynamometer manufacturer’s recommendations if frictional losses can be stabilized without warming (Annex 8).
- Change references to “UN Regulation No. [xxx] on RDE” in your checklists to UN Regulation No. 168 on RDE.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
More UN R83 change reports
- 09 series — Supplement 1
- 09 series — Base text
- 08 series — Supplement 4
- 08 series — Supplement 2
- 08 series — Supplement 1
- 08 series — Base text
- 07 series — Supplement 18
- 07 series — Supplement 17
- 07 series — Supplement 16
- 07 series — Supplement 15
- 07 series — Supplement 14
- 07 series — Supplement 13
- 07 series — Supplement 12
- 07 series — Supplement 11
- 07 series — Supplement 9
- 07 series — Supplement 8
- 07 series — Supplement 7
- 06 series — Supplement 21
- 06 series — Supplement 20
- 06 series — Supplement 19
- 06 series — Supplement 18
- 06 series — Supplement 17
- 06 series — Supplement 16
- 06 series — Supplement 15
- 06 series — Supplement 14
- 06 series — Supplement 13
- 06 series — Supplement 12
- 06 series — Supplement 11