2019 NASCAR Rules Package and Usage Schedule
With its new aero package for 2019, NASCAR wants to increase drag and downforce while decreasing horsepower in its Cup cars at certain tracks. This comes after NASCAR had spent several years trying to decrease downforce, making the cars tougher to handle.
In theory, the cars in 2019 will be easier to drive on intermediate tracks with the new aero package, which has been described as similar to, but not exactly the same as, the package Cup cars ran in the 2018 All-Star Race. That event featured an unprecedented amount of drafting and pack racing at the 1.5-mile Charlotte Motor Speedway.
The new aero package that will be run in every Cup race in 2019 consists of the following:
- Spoiler: 8" by 61".
- Splitter: 2" overhang, 10.5" wings at ends of splitter (near tires).
- Radiator pan: 37" in front tapered to 31" with vertical fences.
- Aero ducts: Used at majority of oval tracks larger than 1 mile.
In addition, at tracks longer than 1.2 miles, the new aero package will include both air ducts and a smaller tapered spacer. Among those tracks, Atlanta, Pocono, Darlington and Homestead are exceptions; cars in those races will feature the smaller tapered spacer, but not the air ducts. The smaller tapered spacer (from 1.17 inches in diameter to 0.922 inches in diameter) will restrict more air flow and decrease horsepower from a target of 750 to a target of 550. The air ducts will increase drag and downforce.
Engine, Chassis and Testing
- 750 HP: 1.17" tapered spacer (Used at short tracks and road courses).
- 550 HP: 0.922" tapered spacer (Used at oval tracks larger than 1 mile).
- Enhanced vehicle chassismandatory at all tracks (previously announced).
- Adding 3 long block engine seals in points races. These are in addition to the 13 short block seals introduced this season.
- 25% reduction in testing (3 organizational tests, down from 4; 3 teams at each Goodyear test, down from 4).