Thanks to HisPony for getting us a NHRA Rule Book...
The NHRA Rulebook provides guidelines and minimum standards for the construction and operation of vehicles used in NHRA Championship Drag Racing and at member-track events.
FRAME: 4
ROLL BAR
Roll bar mandatory in all cars (including T-tops) running 11.00 (*7.00) to 11.499(*7.35), in convertibles running 11.00(*7.00) to 13.49(*8.25), and in all dune-buggy-type vehicles running 12.00(*7.50) seconds and slower. Permitted in all cars. See General Regulations 4:10, 10:6
ROLL CAGE
Roll Cage mandatory in cars running 10.99(*6.99) or quicker or any car exceeding 135 mph. In full-bodied cars, with unaltered firewall, floor, and body (from firewall rearward, wheeltubs permitted), running between 10.00(*6.40) and 10.99(*699), roll bar permitted in place of roll cage. In convertibles running 10.99 or quicker or exceeding 135 mph, roll cage mandatory. Cars running 7.50(*5.50) and 9.99 (*6.39) must have chassis recertified every three years by NHRA and have a serialized sticker affixed to cage before participation.
IMPORTANT ADD ONS
Jan 1, 1999 - Roll Cage padding meeting SFI Spec 45.1 mandatory anywhere driver's helmet may come in contact with roll-cage components
The NHRA Rulebook provides guidelines and minimum standards for the construction and operation of vehicles used in NHRA Championship Drag Racing and at member-track events.
FRAME: 4
ROLL BAR
Roll bar mandatory in all cars (including T-tops) running 11.00 (*7.00) to 11.499(*7.35), in convertibles running 11.00(*7.00) to 13.49(*8.25), and in all dune-buggy-type vehicles running 12.00(*7.50) seconds and slower. Permitted in all cars. See General Regulations 4:10, 10:6
ROLL CAGE
Roll Cage mandatory in cars running 10.99(*6.99) or quicker or any car exceeding 135 mph. In full-bodied cars, with unaltered firewall, floor, and body (from firewall rearward, wheeltubs permitted), running between 10.00(*6.40) and 10.99(*699), roll bar permitted in place of roll cage. In convertibles running 10.99 or quicker or exceeding 135 mph, roll cage mandatory. Cars running 7.50(*5.50) and 9.99 (*6.39) must have chassis recertified every three years by NHRA and have a serialized sticker affixed to cage before participation.
IMPORTANT ADD ONS
Jan 1, 1999 - Roll Cage padding meeting SFI Spec 45.1 mandatory anywhere driver's helmet may come in contact with roll-cage components
