![]() ![]() ![]() The NHRA handbook covers cars 8.50 second ET (elapsed time) in the 1/4 mile and slower, and that is free from NHRA online. Remember that the rule books list minimum wall thickness and minimum diameter, you can always go bigger and thicker and pass an inspection, which can allow you to buy fewer dies to complete a project. Get a 6.0 CLR for all sizes that you buy over 1.25 OD to be able to bend to the thin wall tubing used. 083 is the tubing most of the NHRA specs are based on, but you will have to get your rulebook to determine all the sizes you need. 120 wall, and it will look best on a 6″ CLR (bend radius) die, but can be done on a 4.5 CLR with more deformation. Here is a few guidelines based on what you’re doing:Ĥ×4 projects (rock bouncers, buggies, exo cages, in cab cages, Jeeps, Toyotas, etc): Go with a 1.75 (1 3/4) OD tube die. Our team has the experience to get you the right dies for the correct OD (outside diameter)with your tubing bender. This is just a sliver of the info from our TECH INDEX (LINK). ![]()
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