Cage rule book?
 

Anyone have another rule book from any other organization?

Mine states 3000lbs+ must use 1.75" x 0.120" DOM only. I found a great builder but only has dies for 1.5". 1.5x0.120 is only 8,252lbs tensile strength lower. That's better than even 1.75x0.95" by 1841lbs. If not I take it everyone here just runs 1.75"?

Nvm nasa is even lower. 2650lbs or less.

is this for a full wheel to wheel cage or just a roll bar for HPDE/TT?

Whatever to save my life if need be. It'll be a rear only cage for now. But if everyone says it must be xxx size they're doing it for good reason.

SCCA


C. Minimum tubing sizes for (all Showroom Stock, Touring and
Improved Touring Category automobiles registered after June
1, 1994) for all required roll cage elements (All dimensions in
inches):
Up to 1500 lbs 1.375 x .095 DOM / Seamless / Alloy
1501-2200 lbs 1.500 x .095 DOM / Seamless / Alloy
or 1.500 x .120 ERW
2201-3000 lbs 1.500 x .120 DOM / Seamless / Alloy
1.625 x .120 DOM / Seamless / Alloy
1.750 x .095 DOM / Seamless / Alloy
or 1.750 x .120 ERW
(American Sedans may construct to these
specifications regardless of weight.)

3001-4000 lbs 1.750 x .120 DOM / Seamless / Alloy - No
ERW
Over 4000 lbs 2.000 x .120 DOM / Seamless / Alloy - No
ERW
Main hoop: 4 bends maximum, totaling 180 degrees ± 10
degrees.
Front hoop: 4 bends maximum or Front downtubes: 2 bends
maximum.
Rear hoop supports: No bends.
If any of the above bend requirements cannot be met, all
components of the roll cage shall be fabricated from the tubing
size(s) listed for the next heavier category of automobiles.
D. For purposes of determining tubing sizes, the vehicle weight
is as raced without fuel and driver. The minus tolerance for
wall thickness should not be less than .010" below the nominal
thickness. Improved Touring roll cage tubing sizes are to be
calculated based on the published vehicle weight minus 180
lbs.
E. An inspection hole at least 3/16 inch diameter shall be drilled
in a non-critical area of all tubes with a specified size to
facilitate verification of wall thickness.

My fabrication guy used 1 5/8th .120 wall for my Main hoop and support bars. and 1.5 .120 wall for my diagonal and harness bar sections. He's an experienced cage builder for both road race and off road setups and was certain it would be good for the Z's weight. My car is also a HPDE/TT car only.

Those weights are going to be maximum, as raced. If you might ever be 3010 +/-5% with a full tank, driver, helmet, cool suit and use less than 1.75 x .120 DOM don't be upset when a marshal sends you home in a good natured attempt to save your life.

This is why I said nvm in post 2. I won't be mismatching tube sizes and won't be sub 3k for a long time. I won't ever be sent home for an open track day but if I did race and was sent home there's a reason. So I might as well take that advice and build it right I guess.

If you have wheel to wheel plans in the long run I agree build to spec. But you'll never be sent home for a hpde or TT

Since you're out alone basically?

Well yeah, there is no CCR for hdpe and TT. My Z is never going to be a w2w car. I have my Honda Challenge build for that

Yea, for doing HPDE, no cage is needed. Unless you're a rag top. Then you might only need a basic bar.

Actually the NASA CCR does apply for HPDE and TT... It contains the rules for both!

synolimit: Are you doing all this all before you go to the track? If so don't do that. You will be just fine for a while with the stock safety equipment. It was designed very well.

I don't think a crash knows that. Whether its me crashing or a pro, a crash is a crash. Would you want to hit a wall at 150 and just leave it up to the factory equipment it was never intended to see?

What I'm saying is that if you're new to the track you won't be going 150. :)