The National Hot Rod Diesel Association - The largest and longest-running diesel motorsport organization in the world.
Unlimited Open Class
Run What You Brung
All-out. No restrictions. Flashlight start every time.
The open class for the 3,000+ horsepower builds that don't fit any other box. Bring whatever you've got — unlimited turbos, unlimited power, flashlight start, no prep surface, heads-up. This is where the Casey Turbo, Crazy Horse, and Cormic-style race trucks come out to play.
At A Glance
- Purse: $5,000 to win
- Surface: No prep, 1/8 mile
- Launch: Non-boosted, idle in Drive ≤ 800 RPM
- Tires: Street only, 400+ treadwear
- Min Weight: 7,000 lbs
- Safety: Full safety gear per NHRDA rulebook — verified at tech
Turbo Allowances
| Platform | Allowance |
|---|---|
| All diesels | No size restrictions — run what you brung |
Class-Specific Notes
- Targeting the 3,000+ hp race truck crowd
- Flashlight start, 1/8 mile, no prep surface, single elimination
- Final rule sheet and safety requirements published per event
Shared Series Rules
Applies to both Average Joe and Blue Collar classes. See the full rules page for complete details.
Launch
- At the starting line, the truck must be in Drive and idling at no more than 800 RPM prior to launch. Tech may verify by sound and/or tach. Failure to comply may result in disqualification.
Vehicle
- Diesel vans, trucks, and Excursions only
- Must be a production truck that came from the factory with a diesel engine
- No cars or car-based chassis conversions
Fuel / Drivetrain
- Single high-pressure injection pump only
- No limitations on lift pump systems
- 2WD only. 4WD trucks must remove the front driveshaft — no exceptions
Tires
- Street tires only — minimum 400 treadwear
- No slicks, no drag radials. M/T, R/T, H/T, A/T all fine if 400+ TW
Race Format
- 1/8 mile, instant green (flashlight start may be used)
- Non-boosted launches — leave from idle
- Cross center — you lose
- Leave early — you lose
- Single burnout — 5 seconds maximum
Run this Class at These Events
February 27-28, 2026
Diesels in the Desert
Firebird Motorsports Park · Chandler, AZ