2quick
Well-Known Member
I will be running Drag week in September with my 66 Satellite. I have a roll bar that has allowed me to run to 10.00, that no track official has ever had a problem with. What I'm concerned about is I don't use "D" Bars as I often have my kids in the back seat going to car shows and such. I nervous i'm going to get there and not pass tech. Does anyone know if a 10.0 - up car with stock fire wall and floor pans needs "D" Bars to be compliant? I do not see a reference to these "D" bars in the roll bar illustration. But do on the Roll cage illustration. This is the line of text from the roll bar criteria that concerns me.
Roll bar must be adequately supported or cross-braced to prevent forward or lateral collapse.
4:10 ROLL BAR All roll bars must be within 6 inches of the rear, or side, of the driver’s head, extend in height at least 3 inches above the driver’s helmet with driver in normal driving position or be within 1 inch of the roof/headliner in the area above the driver’s helmet, and be at least as wide as the driver’s shoulders or within 1 inch of the driver’s door. Roll bar must be adequately supported or cross-braced to prevent forward or lateral collapse. Rear braces must be of the same diameter and wall thickness as the roll bar and intersect with the roll bar at a point not more than 5 inches from the top of the roll bar. Crossbar and rear braces must be welded to main hoop. Sidebar must be included on driver’s side and must pass the driver at a point midway between the shoulder and elbow. Swing-out sidebar permitted. All roll bars must have in their construction a cross bar for seat bracing and as the shoulder harness attachment point; cross bar must be installed no more than 4 inches below, and not above, the driver’s shoulders or to side bar. All vehicles with OEM frame must have roll bar welded or bolted to frame; installation of frame connectors on unibody cars does not constitute a frame; therefore it is not necessary to have the roll bar attached to the frame. Unibody cars with stock floor and firewall (wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x .125-inch steel plates on top and bottom of floor bolted together with at least four 3/8-inch bolts and nuts, or weld main hoop to rocker sill area with .125-inch reinforcing plates, with plates welded completely. Also, the roll bar may be welded to frame connectors that are fully welded in place and are 1 5/8 inches x .118-inch MS or .083-inch CM round and/or 2 inch x 2 inch x .058 MS or CM rectangular. All 4130 chromoly or Docol R8 tube welding must be done by approved TIG heliarc process; mild steel welding must be done by approved MIG wire feed or approved TIG heliarc process. Welding must be free of slag and porosity. Any grinding of welds prohibited. See illustration. Roll bar must be padded anywhere driver’s helmet may contact it while in driving position. Adequate padding must have minimum 1/4-inch compression or meet SFI Spec 45.1. All cars running 9.99 (*6.39) or quicker, SFI Spec 45.1 mandatory.
NHRA rule book states this for roll cage!
“D” bar installation for full-bodied cars: For front-wheel-drive cars, with complete OEM floor (from the firewall to the rear of the trunk) and rocker/sill boxes, the 1 1/4-inch x .058-inch CM (.118-inch MS) “D” bars (when required; i.e., when the main hoop is not welded to the frame) must be welded to a 1 5/8inch x .083-inch CM (.118-inch MS) crossmember welded to the rocker/sill box via conventional 6-inch x 6-inch x 1/8-inchthick plates or welded to main hoop. For rear-wheel-drive cars, with neither a frame nor subframe connectors, but with complete OEM floor (from the firewall to the rear of the trunk; exception: the rear inner wheelwells may be tubbed with steel or aluminum), the 1 1/4-inch x .058-inch CM (or .118-inch MS) “D” bars may be welded to conventional 6-inch x 6-inch x 1/8-inch formfitted/contoured plates attached to the driveshaft tunnel. Otherwise, the “D” bars must be attached to frame, subframe, or subframe connectors.
Roll bar must be adequately supported or cross-braced to prevent forward or lateral collapse.
4:10 ROLL BAR All roll bars must be within 6 inches of the rear, or side, of the driver’s head, extend in height at least 3 inches above the driver’s helmet with driver in normal driving position or be within 1 inch of the roof/headliner in the area above the driver’s helmet, and be at least as wide as the driver’s shoulders or within 1 inch of the driver’s door. Roll bar must be adequately supported or cross-braced to prevent forward or lateral collapse. Rear braces must be of the same diameter and wall thickness as the roll bar and intersect with the roll bar at a point not more than 5 inches from the top of the roll bar. Crossbar and rear braces must be welded to main hoop. Sidebar must be included on driver’s side and must pass the driver at a point midway between the shoulder and elbow. Swing-out sidebar permitted. All roll bars must have in their construction a cross bar for seat bracing and as the shoulder harness attachment point; cross bar must be installed no more than 4 inches below, and not above, the driver’s shoulders or to side bar. All vehicles with OEM frame must have roll bar welded or bolted to frame; installation of frame connectors on unibody cars does not constitute a frame; therefore it is not necessary to have the roll bar attached to the frame. Unibody cars with stock floor and firewall (wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x .125-inch steel plates on top and bottom of floor bolted together with at least four 3/8-inch bolts and nuts, or weld main hoop to rocker sill area with .125-inch reinforcing plates, with plates welded completely. Also, the roll bar may be welded to frame connectors that are fully welded in place and are 1 5/8 inches x .118-inch MS or .083-inch CM round and/or 2 inch x 2 inch x .058 MS or CM rectangular. All 4130 chromoly or Docol R8 tube welding must be done by approved TIG heliarc process; mild steel welding must be done by approved MIG wire feed or approved TIG heliarc process. Welding must be free of slag and porosity. Any grinding of welds prohibited. See illustration. Roll bar must be padded anywhere driver’s helmet may contact it while in driving position. Adequate padding must have minimum 1/4-inch compression or meet SFI Spec 45.1. All cars running 9.99 (*6.39) or quicker, SFI Spec 45.1 mandatory.
NHRA rule book states this for roll cage!
“D” bar installation for full-bodied cars: For front-wheel-drive cars, with complete OEM floor (from the firewall to the rear of the trunk) and rocker/sill boxes, the 1 1/4-inch x .058-inch CM (.118-inch MS) “D” bars (when required; i.e., when the main hoop is not welded to the frame) must be welded to a 1 5/8inch x .083-inch CM (.118-inch MS) crossmember welded to the rocker/sill box via conventional 6-inch x 6-inch x 1/8-inchthick plates or welded to main hoop. For rear-wheel-drive cars, with neither a frame nor subframe connectors, but with complete OEM floor (from the firewall to the rear of the trunk; exception: the rear inner wheelwells may be tubbed with steel or aluminum), the 1 1/4-inch x .058-inch CM (or .118-inch MS) “D” bars may be welded to conventional 6-inch x 6-inch x 1/8-inch formfitted/contoured plates attached to the driveshaft tunnel. Otherwise, the “D” bars must be attached to frame, subframe, or subframe connectors.
