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The Terminator
Driveline
Broke half shaft! Need opinions on what to buy so this don't happen again!
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<blockquote data-quote="tt335ci03cobra" data-source="post: 15089624" data-attributes="member: 68944"><p>The drag radial concern is because the radial construction doesn't twist and absorb torque load like a wrinkle wall slick does, but the compound is so sticky that it grips very hard almost like a slick. The torque generated has no where to unload because the tire doesn't wrinkle, and grip is very good.</p><p></p><p>This mitigates all of the torque force into the mechanical parts.</p><p></p><p>If the IRS is built, tight, and basically free of deflection and unwanted movement, there isn't a huge problem.</p><p></p><p>If the IRS is tired, deflects a lot, and basically loose, the drag radial tires will grip hard, the sidewall won't flex, and all that torque will be channeled to the weak links of the IRS. It will chatter and hop like a jack hammer. Parts will sheer and break.</p><p></p><p>Now if the IRS is built and tight, the issue can't develop nearly as much as there won't be any chatter or hopping. The torque force is still very strong though and will be channeled to all the mechanical parts.</p><p></p><p>A wrinkle wall slick absorbs much of the torque, much like a soft nerd rubber ball (football, basket ball et al) absorbs and deflects upon impact with a wall, vs a hard rubber ball. The soft ball won't bounce far off a wall. In stop motion, it's compressing very hard on impact. A hard ball bounces much better because the force isn't absorbed, it's temporarily transferred to the wall, and right back off, as it maintains most of its speed.</p><p></p><p>Full tilt boogie facing has nice go pro videos on YouTube of the IRS under wheel hop and once fortified, and it puts it all into context. Elsewhwhere on other channels, there are lots of good videos on tire deflection too, and why irs and drag radial can be a terrible idea.</p><p></p><p>I have level 5 s2's axle wise, and with a tight irs, I don't have any hop, so my drag radials haven't been a terrible issue. It sees more street time than track time, and I like to hook so I run drag radials. You also want to use a softer launch technique as well. I use 3500 on 4-6psi and roll into power. It's a 1.60-1.70 approach. If I tried 4500 and 10psi+, it'd be gripping it on a hot prepped surface, but literally twice the torque load, and lead to wear and tear related damage much faster.</p></blockquote><p></p>
[QUOTE="tt335ci03cobra, post: 15089624, member: 68944"] The drag radial concern is because the radial construction doesn't twist and absorb torque load like a wrinkle wall slick does, but the compound is so sticky that it grips very hard almost like a slick. The torque generated has no where to unload because the tire doesn't wrinkle, and grip is very good. This mitigates all of the torque force into the mechanical parts. If the IRS is built, tight, and basically free of deflection and unwanted movement, there isn't a huge problem. If the IRS is tired, deflects a lot, and basically loose, the drag radial tires will grip hard, the sidewall won't flex, and all that torque will be channeled to the weak links of the IRS. It will chatter and hop like a jack hammer. Parts will sheer and break. Now if the IRS is built and tight, the issue can't develop nearly as much as there won't be any chatter or hopping. The torque force is still very strong though and will be channeled to all the mechanical parts. A wrinkle wall slick absorbs much of the torque, much like a soft nerd rubber ball (football, basket ball et al) absorbs and deflects upon impact with a wall, vs a hard rubber ball. The soft ball won't bounce far off a wall. In stop motion, it's compressing very hard on impact. A hard ball bounces much better because the force isn't absorbed, it's temporarily transferred to the wall, and right back off, as it maintains most of its speed. Full tilt boogie facing has nice go pro videos on YouTube of the IRS under wheel hop and once fortified, and it puts it all into context. Elsewhwhere on other channels, there are lots of good videos on tire deflection too, and why irs and drag radial can be a terrible idea. I have level 5 s2's axle wise, and with a tight irs, I don't have any hop, so my drag radials haven't been a terrible issue. It sees more street time than track time, and I like to hook so I run drag radials. You also want to use a softer launch technique as well. I use 3500 on 4-6psi and roll into power. It's a 1.60-1.70 approach. If I tried 4500 and 10psi+, it'd be gripping it on a hot prepped surface, but literally twice the torque load, and lead to wear and tear related damage much faster. [/QUOTE]
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Driveline
Broke half shaft! Need opinions on what to buy so this don't happen again!
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