How Classing Works
A guide to understanding Qualy's two-step classing system — Motor class and Modification level — and how to find the right class for your car.
By Qualy
Qualy's classing system is designed to be as simple as possible, while still trying to be fair. Cars are grouped by what powers them and how much they've been modified. The goal of our classing system is to create fun, fair competition among similar cars, regardless of when or where you'll drive. As always, please make sure your car is classed appropriately.
Here's something you may not hear from other track organizations — don't worry about building your car to the Qualy classing system. If that is your preference, that's great — but if you've already built your car for an in-person platform (SCCA autocross, time trials, or any other organizing body), we recommend focusing on that, and treating our platform as more of a side competition. That said, we hope you find our ruleset to fit your car well and that it will provide engaging and meaningful competition.
Classing happens in two steps: Motor first, then Modification.
Motor
Your motor class is based on the actual engine or motor configuration in the car, which may not necessarily be the motor it started with. The classing structure is as follows:
- A — up to 1.8L Forced Induction / up to 2.5L Naturally Aspirated / up to 1.3L Rotary Naturally Aspirated
- S — 1.9L FI – 2.5L FI / 2.6L – 3.7L NA / 1.3L Rotary FI / Single Motor Electric
- R — 2.6L FI – 3.5L FI+ / 3.8L NA – 5.0L NA / 1.4L Rotary FI – 1.9L Rotary FI / Dual Motor Electric
- X — 3.6L FI+ / 5.1L NA+ / 2.0L Rotary FI+ / Tri Motor Electric or greater
- U — Exclusion class regardless of motor for cars such as: Any Corvette above the base level, any 911 above the base level, any race-level production car (Ford Mustang GTD, Cayman GT4), and any supercars (Ferrari, Lamborghini, etc.)
In general, smaller displacement and lower powered cars fall into lower classes. Larger displacement, higher powered cars move up. Cars that have engine swaps should go by the engine currently in the car. While we recognize this doesn't take into account factors such as weight, we feel this is the best solution for our platform.
Modification
After the motor, the car is then grouped by the modification level. At a high level:
- Stock — Mostly factory cars with minor safety, reliability, and basic track-prep changes
- Street — Common bolt-on modifications for performance and handling
- Street-E — Street-level cars running E85, engine swaps, or electric powertrains
- Track — Builds upon Street-E, adding aero, and allowing for other major changes
- Unlimited — Purpose-built race cars, tube-frame cars, and open-wheel vehicles
Classes up to and including Track will run 200tw street tires, at varying width allowances. Unlimited is allowed to run race slicks. Please see the rulebook for the full list of allowed modifications for each class — the above is an overall guideline of the spirit of the class and should not be used for car classing.
Car Classing Questionnaire
For our drivers' convenience, we have built a car classing questionnaire that will quickly determine the car's class with a few short questions. This can be accessed by going to the car in your garage and selecting the classing option. The questionnaire will focus on common builds and modifications, but cannot capture every edge case. It is up to the driver to make sure their class is accurately determined. For questions related to classing, we recommend reaching out to us at info@qualytimeattack.com.