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I pulled the entire interior out but added an 8 point full race cage. Leaving the glass. And adding torque arm and PHB. Just curious. Am I saving any weight.?
 

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I weigh pretty much everything that I add or remove from my car, and I scale it after any major changes to get my weight distribution and set my corner weights.
 

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I pulled the entire interior out but added an 8 point full race cage. Leaving the glass. And adding torque arm and PHB. Just curious. Am I saving any weight.?
It's hard to say without actually weighing everything as you do it, but I'd guess you're adding weight. A roll cage, TA & PHB are 3 big chunks of steel.
 

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A chrome moly roll cage can be 100 lbs lighter than one out of mild steel.
 

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There is about less than ~1# of weight difference between 1' of 4130 CM and 1' of .134 wall ERW (MS). In an 8-point cage the difference is probably only ~20# or less and 4130 is several times more expensive than MS.
If you're to the point where you're only doing mild weight reduction and leaving glass in the car, don't waste the money on CM.
 

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There is a lot more than 20 feet of tubing in a 8 point cage.
 

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All steel has virtually the same density. The rollcage will weigh the same no matter which steel alloy it is made of, assuming the same dimensions. If you use a steel alloy with a higher yield strength, then you can use a thinner wall thickness and the rollcage will weigh less. However, the rollcage will be less stiff. The modulus of elasticity of most steel alloys is the same. Use a thinner wall thickness and the cage will be less stiff, no matter what alloy is used.
 

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Discussion Starter #8
I used a chrome moly cage. I thought I was making the car lighter by stripping the interior but I was surprised by how light most of the interior is. I'm guessing there won't be much weight savings but at least it won't rip itself apart. 1-3/4" x .095 wall
 

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Nicely designed rollcage. Straight tubes. No part of it extends into the crush zone of the body.

If you have the chance, add a diagonal to the roof.
 

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my 4-pt. cage weighs way less than 100 pounds
I have a 10 point cage, the weight savings become significant when you have a lot more tubing...
 
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