I've been studying the forces on a 3 link. Would love feedback on what I've got wrong!
I think the biggest force on the 3rd link will be the "axle wrap" type force that pulls the UCA torque boxes off the body in the drag cars.
www.physicsforums.com
I think the amount of force will be close to 7000 ft/lbs. Calculated 280 ft/lbs (torque at flywheel for my weak 4.2L) x 2.5 (torque converter ratio between 2.5 and 0) x 0.85(transmission efficiency loss) x 2.48 (1st gear transmission gear ratio in 4r70w) x 3.55 (rear end gear ratio) x 12"/9" (3rd link will mount approximately 9 inches from center of axle in my sketches)
https://www.pirate4x4.com/threads/how-to-calculate-how-much-torque-at-axle.558226/
On the top link the axle wrap will be offset slightly by the acceleration force that will be pushing from the axle forward against the car. Assuming 25 inch wheel diameter and the forces split equally between the 3 links I think this force will be around 800 ft/lbs.
Did a very naive design of a body side mount that would go between the current upper control arm mounts. Simulation with those numbers went as well as expected using 1/8" 4130 chromoly
Wonder what kind of clearance issues I would have if I tried to run the link up into the driveshaft/trans tunnel like the old evolution motorsports kit?
I think the biggest force on the 3rd link will be the "axle wrap" type force that pulls the UCA torque boxes off the body in the drag cars.
Understand Rear Axle Forces in Car Suspensions w/ Instant Center Plot
When I read pages or look at calculators for car suspensions it seems they have things wrong. They seem to consider both the upper and lower arms as a straight line intersection where the tire contact patch effectively "pushes" through the intersect point. I'm trying to understand the forces...
I think the amount of force will be close to 7000 ft/lbs. Calculated 280 ft/lbs (torque at flywheel for my weak 4.2L) x 2.5 (torque converter ratio between 2.5 and 0) x 0.85(transmission efficiency loss) x 2.48 (1st gear transmission gear ratio in 4r70w) x 3.55 (rear end gear ratio) x 12"/9" (3rd link will mount approximately 9 inches from center of axle in my sketches)
https://www.pirate4x4.com/threads/how-to-calculate-how-much-torque-at-axle.558226/
On the top link the axle wrap will be offset slightly by the acceleration force that will be pushing from the axle forward against the car. Assuming 25 inch wheel diameter and the forces split equally between the 3 links I think this force will be around 800 ft/lbs.
Did a very naive design of a body side mount that would go between the current upper control arm mounts. Simulation with those numbers went as well as expected using 1/8" 4130 chromoly
Wonder what kind of clearance issues I would have if I tried to run the link up into the driveshaft/trans tunnel like the old evolution motorsports kit?
