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NASCAR Unveils New Cup OEM Rules for Clearer Racing Standards
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Highlights
- Short track rules package applies to five specific NASCAR tracks.
- Tracks will use 750-horsepower tapered spacer, up from 670 horsepower.
- Mandatory bright orange A-flap introduced for car safety next season.
- New manufacturers allowed three testing sessions before March 1 deadline.
- Backup engines must be declared and inspected before event start.
- Dodge and RAM preparing returns; Honda considering Cup Series entry.
NASCAR issues a comprehensive rule book update on Friday, defining short‑track horsepower, safety requirements, backup engine governance, and pathways for additional manufacturers in the Cup Series.
Bristol, Darlington, Dover, Nashville, and Gateway will run the short‑track package using a 750‑horsepower tapered spacer, up from 670, in the first Next Gen increase.
Bristol, Gateway, and Nashville are reclassified from intermediate status. They adopt the higher output and a simplified rear diffuser previously used to improve drivability.
Short tracks move from 670 to 750 horsepower for the first time in the Next Gen era.
A-flap posts become mandatory at all tracks next season. The device must be painted bright orange to aid visibility for officials and teams.
New OEMs receive a maximum of three test sessions. Each session can run for up to two consecutive days with no more than three affiliated organizations.
Each organization may field two cars. All tests must conclude by March 1 and cannot occur at recently repaved tracks, new schedule additions, or venues within 60 days.
Prospective OEMs are limited to three sessions, two days each, across three organizations and two cars apiece, with a March 1 deadline.
A new OEM is one absent from the series for five consecutive seasons. Dodge plans a Cup return, RAM re-enters Trucks, and Honda continues evaluating a future program.
Backup engine control tightens. Teams must declare all event backup engines before competition begins, aligning inventory visibility across organizations.
Each engine builder’s backup pool is capped at half the number of its supported teams, rounded up. All teams sharing a builder must use a common declared list.
One declared backup may be pre-installed in a backup car. Any other declared backup must be presented, inspected, and sealed before departing the event site.
Backup engines are capped per builder at half the supported teams, with shared lists across partner entries.
NASCAR releases the update ahead of the charter deadline requiring delivery by November 15. Minor adjustments remain possible, but teams now have planning clarity.
The horsepower increase targets short‑track race quality, while diffuser simplification manages wake and stability. Reclassification addresses venue characteristics rather than simple track-length labels.
Testing caps moderate integration speed for new manufacturers, preserving competitive integrity. Engine rules standardize contingencies, easing logistics for builders and satellite teams.
Collectively, these measures give teams and OEMs a framework for next season and 2026 planning, balancing performance, safety, and market growth.
Visual Summary
John Martinez delivers real-time NASCAR Cup Series and Truck Series news, from live race updates to pit-lane strategy analysis. A graduate of the University of Northwestern Ohio’s Motorsports Technology program, he breaks down rule changes, driver tactics, and championship points with crystal-clear reporting.
