E36 Rollcage Tubing

[93ITSBMW]

I am building a rollcage for my 93 325is and was wondering if anyone knew what kind of tubing I need to get, how much I need of it, where I can purchase it from and at what price?

Thanks for your help,
Jeff

[James Clay]

TW Metals. Get DOM and you should get a GCR - don't take anyone's advice as a substitute for the printed rules.

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James Clay
http://www.bimmerworld.com
Engineered BMW Performance
World Challenge/SCCA/BMWCCA Racecar Rental
Genuine OEM and Used BMW Parts
(540) 639-9648
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[93ITSBMW]

The thickness of the tubing is based on the weight of the car, correct? The minimum is 2800lbs so do I base it off of that? If so, is there a formula I should use?

Do you have a phone number for TW Metals or is that the name of the metal? And how much should I get? What does DOM stand for? Sorry, I am new at this.

Thanks for your help James.

[erlrich]

Jeff - DOM stands for "drawn-over-mandrel", and refers to the process used to manufacture the tubing. As James said, if you're going to be racing in IT then you really need to get the 2003 GCR (General Competition Rules) and read it. You can get an order form from the SCCA website. The GCR will tell you everything you need to know about the roll cage material, tubing size, and basic design requirements. It's the only way to make sure you'll be 100% legal. Oh, and did I mention you should also get a copy of the 2003 GCR?

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Earl
ITA 240SX in process

[James Clay]

TW Metals is a supplier, you may have a local supplier also - http://www.tdmaterials.com/

There are too many variables and too much room for error for a quick reply. Our cages are 1.75"x0.095" 4130 DOM.

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-----------------------------------------------------------
James Clay
http://www.bimmerworld.com
Engineered BMW Performance
World Challenge/SCCA/BMWCCA Racecar Rental
Genuine OEM and Used BMW Parts
(540) 639-9648
-----------------------------------------------------------

[93ITSBMW]

"Our cages are 1.75"x0.095" 4130 DOM"

Does this apply to your World Challenge cars as well as your ITS cars? Another stupid question but do you use stainless Steel or??

Thanks again for your help.

[James Clay]

WC is a little different but the basis is the same size. 4130 steel.

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James Clay
http://www.bimmerworld.com
Engineered BMW Performance
World Challenge/SCCA/BMWCCA Racecar Rental
Genuine OEM and Used BMW Parts
(540) 639-9648
-----------------------------------------------------------

[93ITSBMW]

Thank you James for your help, you are an asset to the racing community.

[Greg Amy]

Originally posted by James Clay:
...don't take anyone's advice as a substitute for the printed rules...

Did that ARRC Runoffs alarm go off again just now...? <VERY big grin>