Classing Calculator
Base Vehicle
Drivetrain Modifications
Suspension
Aero
Fuel Tank
Is your OE/stock fuel tank larger than the allowed capacity for your class?
- A car with an OE gas tank may run over its class fuel capacity.
- Cars in E2/E3/E4 with an oversize tank move up one class.
- Cars in E1 receive a displacement adjustment of 0.1L per gallon over capacity instead of a class change.
- There is no cap on tank capacity.
- Any fuel-capacity adjustment is the final adjustment applied.
| Displacement used for classing | — |
| Min. race weight w/ adjustments (lbs) | — |
| Max tire width (mm) | — |
| Fuel capacity allowed (gal) | — |
Classing Breakdown
| Class | Displ. Max (L) | Fuel Cap (gal) | Tire Width (mm) |
|---|---|---|---|
| E1 | 6.2 | 20 | 295 |
| E2 | 4.5 | 17 | 255 |
| E3 | 2.9 | 15 | 245 |
| E4 | 1.9 | 14 | 225 |
Questions about your classing? Email [email protected].
