---
kind: "section"
citation: "40 C.F.R. § 610.41"
title: "40"
number: "610.41"
heading: "Test configurations."
url: "https://uscodex.org/cfr/40/610.41"
---

# §610.41. Test configurations.

- (a) In order to measure the effectiveness of a retrofit device at least two, and in some cases, three vehicle configurations defined in [§ 610.11](/cfr/40/610.11.md) will be tested. Each vehicle will be tested at least twice in each configuration, as determined by the Administrator.
- (b) **The first test configuration is a baseline configuration.** In this configuration the baseline or unretrofitted vehicle emissions will be measured.
- (c) A second test configuration, an adjusted configuration, may be required at the discretion of the Administrator if a device requires both hardware and engine parameter modifications to achieve the fuel economy improvement. If, in the Administrator's judgment, based on a review of the available information, the combined effects of retrofit hardware installation and parametric adjustment could be substantially duplicated by parametric adjustment alone, then the Administrator may specify a second test, to evaluate such adjustment exclusive of the retrofit hardware.
- (d) The third series of tests, in the retrofitted configuration, will evaluate the full retrofit system installed on the vehicle.

## Notes

### Authority

Authority: Sec. 511, Motor Vehicle Information and Cost Savings Act, as amended (sec. 301, Pub. L. 94-163, 89 Stat. 915 (15 U.S.C. 2011)).

### Source

Source: 44 FR 17946, Mar. 23, 1979, unless otherwise noted.