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Construct Chassis with Round Tubing

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What Exactly is a TransAm Race Car? Inside Pancho Weaver's Basement Shop - Where Innovation is King

What happens here

Examine the fabrication of older Trans Am chassis, typically constructed using square tubing, as seen in a 1986 championship-winning ProFab Camaro. Compare this to the new chassis design, which utilizes round tubing. The new round-tube chassis boasts significantly increased torsional stiffness (36,000 lbs to twist 1 degree, compared to 16,000 lbs for square tubing) and is approximately 100 lbs lighter, even without using chromoly steel. This improvement in stiffness and reduction in weight is achieved primarily through the geometric advantages of round tubing.

Goal: Achieve a stiffer and lighter chassis using round tubing.

Tools and materials

  • 1986 ProFab Camaro Chassis ProFab — Example of a square-tube chassis
  • DOM — Main construction material for the chassis for improved stiffness and reduced weight
  • Square Tubing — Older chassis designs, shown for comparison

What they say

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physically drive this car our particular cars are NASCAR 4-speeds with a gated four-speed transmission a lot of the guys uh run the sequential 5-speeds uh we get a little bit of a weight break and we do play The Weight game and this particular car is is completely different in its main construction um where the earlier cars for about the last 30 years have been Square tube construction kind of like this old uh 1986 transm Championship winning car this is with the Wally doback drove it to the Series Championship win in 1986 it was U sponsored by Chevrolet it was built by protofab as a Bob Riley design and Gary Pratt was a fabricator and the and Charlie celix ran the team so the three of those guys formed a a new team they were all working at Rous in in ' 85 and in ' 86 they all went on their own Journey with Chevrolet and uh they built Chevrolet wanted these cars built to run the series and uh to win the series the championship and uh it was pretty much an open checkbook and they they actually achieved it and uh this car was the V6 actually getting a little bit back and forth with different things but the V6 you could run a V6 and um you could run about 200 and some lbs lighter vehicle um because it's weight to cubic inch right rule so uh the other protofab Camaros which they had three total the first two were uh 310 V8s Chevrolet V8s and the this car was late getting to uh the series that year uh there just too much work to do so uh Chevrolet was pretty excited about that because they were going to come out with the V6 in their passenger Camaros oh yeah and so it kind of was another and then when it won the series Not only was it Chevrolet but the V6 that was just made them over the top they were just they were just so excited about that so this car has been through a few different hands over the years and uh it found me uh about 5 years ago out of Alabama a guy had it down there for many years and um the car is honestly um a real protofab it's chassis number three uh Riley's here in town uh have chassis number one so we're kind of building them together at the about the same time and they'll probably run later later in 25 in uh California at the Rolex is what we're trying to shoot for but to to bring the story back you know and to tell to tell what TransAm is and how it all took place uh from yesterday and then into the day you know so so again we had the square tube construction which people have been doing they're still doing at the brand new Riley…

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