Vehicle Engineering
This metal alloy is commonly used to build safe and strong roll cages in race cars.
What is 4130 Chromoly steel?
This section of the rule book overrides all other conflicting sections when safety is involved.
What is Section 101 – Safety Policies? (2025 §101)
A competitor’s qualifying time must be within this percentage of the fastest in class to remain eligible.
What is 130 percent? (2025 §8.6)
Only these individuals are allowed to refuel vehicles in the paddock area.
What are registered crew members?
This division is eligible for both overall and class records and receives full award eligibility.
What is the Unlimited Division? (2026 §9.16.2)
This part of a race car connects the suspension to the chassis and plays a major role in handling
What is the subframe?
Helmets used in the PPIHC must meet one of these certification standards.
What are Snell SA2020 or FIA 8860 standards? (2026 §102.2)
Drivers missing this mandatory meeting may face a fine up to $5,000 and loss of practice time.
What is the competitor’s meeting? (2025 §2.7)
Fueling operations must be conducted with this safety equipment present.
What is a fire extinguisher?
If the event is stopped early, the Race Director bases results on these.
What are the last official scored times?
The minimum wall thickness allowed for roll-cage tubing in vehicles up to 4,000 lbs is this measurement
What is 0.095 inches (2.413 mm)?
Production vehicles over 4,000 lbs may not use this factory bar for roll-cage support.
What is the OEM dash bar? (2026 §105.2.1)
This official determines the start, finish, and all timing lines for the event.
Who is the Race Director? (2026 §4.1.2)
No vehicle may enter the course without approval from this official.
Who is the Start Line Official?
Cars running naturally aspirated engines may lose up to this percentage of power due to altitude.
What is approximately 30 percent?
A car with a monocoque chassis must include this evidence for approval.
What is proof of safety testing or rollover analysis?
Production vehicles over 4,000 lbs may not use this factory bar for roll-cage support.
What is the OEM dash bar? (2026 §105.2.1)
Vehicles are not allowed on the course within this number of days before Race Day for private testing.
What is 13 days?
This protective item must be worn by anyone fueling a race car.
What are fire-resistant gloves?
Only this group can overturn an official ruling or penalty.
What is the Appeals Committee?
Although the Unlimited Division allows 6061-T6 aluminum for cage construction, a vehicle exceeding this weight must use tubing at least 1.750” × 0.095”.
What is 4,000 pounds (1,814 kg)?
This inspection feature allows officials to verify wall thickness of roll-cage tubes.
What is an inspection hole 3⁄16 – ¼ inch in diameter? (2026 §1908.4.4)?
No driver may request a division change after this has occurred.
What is after their qualifying attempt?
Crew members may not stand in front of or behind a running car during these operations.
What are engine start or warm-up operations?
Drivers who break a division or overall record must still pass this official process before the record is confirmed.
What is post-race technical inspection?