11.49 requires a 5 point cage. They will boot you off the track if you go faster. Ask Dennis how this works! They enforce the rules at this track!
FRom Crankshat - "5 or 6 point rollbar construction (NHRA legal)
Required beginning at 11.49 with a closed car/truck, 13.49 with a convertible.
This topic will cover a 5-point
roll bar as opposed to a roll cage. Most fellows these days will go ahead and build a cage while they have the welder and their tools fired up, but we'll cover the bar for those of you who don't plan on going 9's (or quicker). With an otherwise unaltered floor and firewall,
a 5-point bar will take you to 10.00 flat. If the floor is altered in excess of 4 square feet (not counting wheel tubs or stock removable floor panels which are bolted, such as transmission removal panels on a pickup truck) or the firewall is altered in excess of 1 square foot, then a roll bar will take you to 11.00 and a roll cage as well as additional SFI equipment is required at 10.99.
If the floor or firewall are altered as described, then it only makes sense to get yourself an NHRA rulebook and install a cage because you will only pick up 1/2 second with a bar. (11.49 to 11.00). A "point" refers to a connection point of the end of a bar at the car floor or frame. A 5-point roll bar will have connections as follows:
The main hoop, or B-bar, will connect to the sill/floor/frame/frame crossmember at two points just behind the driver.
The two rear braces will make two more connections somewhere in the trunk area.
The fifth point will be in the area of the driver's left foot, made by the driver's "side bar".
Most of the time, racers will go ahead and install a sixth point "side bar" on the passenger side of the car, helping to stiffen the car up.
One note of interest here, minimum O.D. of the tubing for a roll bar is 1 3/4", for a roll cage it's 1 5/8", so it may be cheaper to buy all 1 5/8" tubing and build the cage from the start."
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