Quote:
Originally Posted by SSDiv6
NHRA does not have the authority to change or override an SFI chassis specification. SFI is an independent motorsports industry entity that serves all types of motorsports, not only in the USA but also worldwide. Doing so puts a liability on NHRA in the event of a crash.
The current applicable specs are as follows:
SFI Spec 25.3C: Full Bodied Car with Aftermarket Body Shell and Tube Frame, OEM Body Shell and OEM Frame with OEM or Modified Floorpan and Firewall, or Uni-Body with OEM or
Modified Floorpan and Firewall Roll Cage – 6.50 to 7.49 Seconds ET;
3,600 lbs. Maximum
SFI Spec 25.5D: Full Bodied Car Stock or Modified/OEM Floorpan and Firewall with OEM Frame or Uni-Body Construction – 7.50 to 8.49 Seconds;
3,600 lbs. Maximum
SFI Spec 25.6: Full Bodied Car Stock / Truck or Modified/OEM Floorpan and Firewall with OEM Frame or Uni-Body Construction – 7.99 to 8.49 Seconds;
5,000 lbs. Maximum
SFI 25.3C and 25.5D is limited to 3,600 lbs. maximum.
Although SFI 25.6 allows up to 5,000 maximum, is limited to a 7.99 ET.
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I see what you say about the 25.6 being good up to 5,000lbs but only 7.99ET, but in the rule book NHRA says stock cars running faster than
8.50 must have an SFI 25.4 or SFI 25.5 cage, no mention of 25.6, and these cars are becoming capable of 7.99