Roll CAGE with fuctional rear seats?
 

My question is, is there a roll cage greater then 4 point that is nhra legal that let's the rear seats to be installed and occupied?
Thanks.

Not if the rear passengers like their heads. Rear passengers with bars is a safety fail. People do it but they are wrong.

yea i've done some looking on this as well. to be nhra legal you need the cross bar. which sucks cause i'd like to keep my rear seats. the cross bar can't be removable either. how fast are you looking to go, cause there is a difference between a roll bar and a roll cage.

Mid 11's at first...

roll bar, 5 point, is needed when you go faster than 11.5 in the quarter or trap over 135mph regardless of et. the rear bars and cross bar must be welded to the main hoop. there are specifics on mounting plate dimensions and tubing thickness.

basically, you can't do what you wanna do.

Of course.... time to do some re thinking/planning....

okay lets say i wanted to go over 135 at the track in the 1/4 mile but i had no intention of racing/competing in competition? DO i still need the roll bar cage even if i just wanna do a couple of passes?

you wont pass tech without it, no tech, no runs. If they dont know the car is that fast, you can make the run, but will probably get kicked out

Go to atco.

What are you running that you are trapping 135 but not racing?

A supra? :lol:

hell naw man im working with a 87 IROC right now but now way in hell is that getting up to 135 i was just curious since we were on the topic but honestly i wouldn't mind a supra . . . .

Atco will still throw you out.

And in any case, the amount of money/time that you will invest in your car to go 135 in the 1/4, the price of a cage wont matter. Regardless of if you are running "competition" or whatever you are saying.

Or just have less friends!!!! It's all about the car. :wink:

or, telling them to wear mouthguards or goalie masks could be a option.

Or, full 5 point harnesses in the rear seat area, then you would really have a jungle gym going.. :rofl:

Full face helmet with a HANS device.

meh, just mount the seats backwards or facing each out like an old school station wagon!

i put kasey in the back of my SS one night with my old cage. brake checks were fun.

My obsession with this just popped up again.

What about makeing the bar going across behind the seats being removable? Like how they have the ones by the door swing or what not. Would it be fine to have pins holding the bar in?

no.

Hahahahahahah

Why?

not legal, unsafe, and a weak point in a crash for the rest of the cage to fail

Understood. Thanks. Damn...

all that. and to remind you again, back seats are never functional with a cage or bar. it is dangerous.

Is your car even fast enough to need a cage?

Car is on stands now...
Its also because I like the look.

Go here and read up......

http://www.nhra.com/tech_specs/sport...C_Rulebook.pdf

Section 4.10

4:10 ROLL BARS
Mandatory in all cars running 11.49 or quicker, or per Class
Requirements. 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,
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 (i.e., pickup truck where body bolts to framerails)
must have roll bar welded or bolted to frame. Installation of
42 GENERAL REGULATIONS
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. All 4130 chrome moly 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.