Quote:
Originally Posted by Coleydog
Interesting how the SFI got those numbers? Did they take a 3000, 3600 and a 4000 lb car, wreck them, then see how they faired? I know there's math involved, but in my opinion, way to many variables unless there's one cage fits all. If pushing the limit of 1-5/8" cm, go to 2", more than doubles the strength. There are ways around this dilemma, look at NASCAR. Over 4000lbs and those cars hit a few walls time to time. Amazing when you're been at the top for a long time, after awhile questions don't get asked.
Like I said, my opinion, Mike
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SFI uses actual crash data and analysis to come up with the specification. In addition, many of the top chassis builders are also consulted.
It is not an arbitrary number.