[joey308]

just wondering if anybody knows when nhra rules make you put in a roll cage?

[1Badsnk]

i believe it's when you get in the 11's. not 100% though

[Dave]

Just did a Google and found this.

When do I need a roll bar or roll cage, and what should it look like?
http://www.nhra.com/images/spacer.gifA roll bar is required in any convertible running 13.49 seconds or quicker in the quarter mile, and in other cars beginning at 11.49. The roll bar is accepted in vehicles running as quick as 10.00 second e.t., provided the stock firewall and floorboard is intact, other than for installation of wheel tubs. The rollbar must be constructed of minimum 1 ¾ inch o.d. x .118 inch wall mild steel tubing, or 1 ¾ x .083 chrome moly tubing, and must conform to the following diagram:

Dave

[psfracer]

Yeah its important to distinguish between a roll bar and a roll cage.

The roll BAR is not needed until 11.49 1/4 mile --at my local 1/8th mile they also enforce the roll bar rule for anything faster then 7.25. I believe it is actually 7.35 but they give a tenth cushion.

Now, a roll CAGE is not needed until you go under 10.00. It also has to be certified.

Once your in the 9's there is alot of other crap you have to worry about also.