Project Land Speed Racer 240SX: Chassis Prep and Roll Cage Fabrication

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Roll cage fabrication, 240sx, S13, Nissan, Silvia, 180SX, land speed racing, SCTA, Racecar, s14, s15, 200 mph club, land speed records, blown gas coupe, moto iq, annie sam, chuck johnson, joe lu, el mirage, bonneville, team rod riders, Jim Pierce motorsports, KW suspension, SPL Pro suspension, Fastbrakes, energy suspension,
 
To satisfy the SCTA tech inspectors, Jim Pierce fabricated door bars with an uninterrupted X design that connect the lower portions of the main hoop and A pillar bar. A huge gusset ties the intersection of the two bars together. To increase the envelope of safety, the door bars have been pushed out horizontally, protruding into the door. This little bit of area will act as a nice cushion in case the car lands on its side after becoming airborne. 
 
Roll cage fabrication, 240sx, S13, Nissan, Silvia, 180SX, land speed racing, SCTA, Racecar, s14, s15, 200 mph club, land speed records, blown gas coupe, moto iq, annie sam, chuck johnson, joe lu, el mirage, bonneville, team rod riders, Jim Pierce motorsports, KW suspension, SPL Pro suspension, Fastbrakes, energy suspension,
 
To completely encapsulate the driver, a sill bar running snugly parallel against the uni-body frame was incorporated into the cage. This “snug” fit is one of the ways that I evaluate how well a cage was built. I've seen a lot of cages that I can stick my arm through the gap between the main hoop and B-pillar. In my opinion, that's just a sign of a lazy or inexperienced cage builder. Jim Pierce prides himself on making cages where you can barely slide a credit card between the cage and the chassis. Remember, the cage should be spread out as far as possible to maximize the envelope of safety. Also, a well-built cage that butts up against the car's interior is also a good way to stiffen up a chassis in race series that limits how many point cage you can have.  
 
Roll cage fabrication, 240sx, S13, Nissan, Silvia, 180SX, land speed racing, SCTA, Racecar, s14, s15, 200 mph club, land speed records, blown gas coupe, moto iq, annie sam, chuck johnson, joe lu, el mirage, bonneville, team rod riders, Jim Pierce motorsports, KW suspension, SPL Pro suspension, Fastbrakes, energy suspension, 

With the cage construction complete, we then turned to painting the cage and interior. Painting is all about good prep work and an investment up front will go a long way towards ensuring that your paint job will look good in the end. The first step is to mask any areas that you don't want painted. Aluminum foil works great for quickly covering tricky things like pedals, wiring, and brake lines. It also helps to lay masking paper on the floor boards to keep the over spray from settling on the floor board while the cage and other areas are painted. If excessive over spray builds up on a surface it makes it difficult to get a smooth paint job down the road.   

 

Roll cage fabrication, 240sx, S13, Nissan, Silvia, 180SX, land speed racing, SCTA, Racecar, s14, s15, 200 mph club, land speed records, blown gas coupe, moto iq, annie sam, chuck johnson, joe lu, el mirage, bonneville, team rod riders, Jim Pierce motorsports, KW suspension, SPL Pro suspension, Fastbrakes, energy suspension,

 

After the masking is complete, the next step is to degrease the surface. This is especially true for the roll cage as steel tubing usually has an oily layer on it to give it some corrosion resistance. MEK does a great job of breaking down the oil and grease. If you live in a state full of hippies like we do here in California, MEK can be pretty hard to find.  As a substitute, denatured alcohol will work nicely.

We degreased the cage surface with denatured alcohol and then roughed up the surface with sand paper and scotch brite. For good measure, we then degreased one more time before we laid down the first coat of primer. On the bare metal surfaces of the cage, we used self etching primer which will help prevent rust down the road. 

 

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