Could someone check my thinking here or point me in the right direction. Have a cantelever upper, coil over sitting perpendicular to the ground. 10.5"
to the upper ball joint, 5.25" to the shock mount. (2:1). Want to redesign to a push rod. Bottom wishbone is 17". Push rod mount 14" approx
50 degree angle. Based on ride height of 2", assume same amount of travel, 2". The old setup, this puts the coilover travel at only 1". I
calculate out that with the same amount of travel. my pushrod will move 1.57". To use the same shock/spring combination the bellcrank would only be
.785" to get the same amount of motion (1" travel)/ response from the coilover. Obviously, the lengths do not pan out. My question is this, if i am
right. I need the same 2:1 ratio for the static spring rate to remain the same, no matter the size of the bellcrank. I need the dimensions listed above (1.57
- .785) to keep the shock dynamics the same. ie: Shaft Speed / Damping rates etc. Staticly, this works.
Now realisticly the bellcrank can not be the dimensions I stated. To get the same damping rate with more travel requires a softer shock due to shaft speed? This will make the car more sensitive to changes? (Good thing in my opinion) The second question is that the spring changes also? Theory being springs rates even if linear, the car would have a higher rate at 2" of wheel travel, because of increased compression due to the increased shock travel.
All this being good, is my thinking right? What is a good book that has the theory and the math to calculate this thing out?
My unknowns at the moment are the final weight of the car, center of gravity.
Spring is 2.25 id x 6" and looks like MAYBE 800lb (written on it I THINK), can't tell and can't rate it at the moment because a friend has my scales.
Shock is carrera 6247 (what is stamped on it anyway) 4" travel.
Mark
Now realisticly the bellcrank can not be the dimensions I stated. To get the same damping rate with more travel requires a softer shock due to shaft speed? This will make the car more sensitive to changes? (Good thing in my opinion) The second question is that the spring changes also? Theory being springs rates even if linear, the car would have a higher rate at 2" of wheel travel, because of increased compression due to the increased shock travel.
All this being good, is my thinking right? What is a good book that has the theory and the math to calculate this thing out?
My unknowns at the moment are the final weight of the car, center of gravity.
Spring is 2.25 id x 6" and looks like MAYBE 800lb (written on it I THINK), can't tell and can't rate it at the moment because a friend has my scales.
Shock is carrera 6247 (what is stamped on it anyway) 4" travel.
Mark
