FYI sfi specs

some of the door car SFI specs

•25.5 - 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.
May be Mig or Tig welded mild steel or Tig welded chromoly.

•25.4 - Full Bodied Car Tube Chassis – 7.50 to 8.49 Seconds; 3,600 lbs. Maximum. May be Mig or Tig welded mild steel or Tig welded chromoly.

•25.3 - 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. Must be 100% Tig welded chromoly.

•25.2 - Full Bodied Car Tube Chassis – 7.49 Seconds & Quicker; 3,200 lbs. Maximum. Must be 100% Tig welded chromoly.

•25.1E - Full Bodied Car Tube Chassis – 7.49 Seconds & Quicker; 2,800 lbs. Maximum. Must be 100% Tig welded chromoly.

but it is up to the tracks and/or racing organization to determine what that means in terms of 1/8th mile.

Ok guys,
Which one of these specs do I need to follow?
3800lb 1982 F100
Plans are for high 10's
full stock frame with no firewall/floor pan mods yet. We might cut the firewall for engine setback in the future.

mike

f250mike wrote:Ok guys,
Which one of these specs do I need to follow?
3800lb 1982 F100
Plans are for high 10's
full stock frame with no firewall/floor pan mods yet. We might cut the firewall for engine setback in the future.

mike

If you're not shooting for an ET of 8.49 or faster in the 1/4, then you don't need to follow the SFI specs. The specs in the NHRA/IHRA rule books will be enough for ET's of 8.50 & slower.

Only 2 real reasons for going with any of the SFI specs on a race car that's slower than 8.49 is if future plans call for ET's faster than 8.50, or to increase a car's resale value.

Thanks Dave
I'll follow the nhra book.
There's no way the truck will ever be fast enough to require the sfi spec or have any resale value.