Rear suspension

[fmicle]

Yep, that's what I think as well, the noise must come from the coils themselves and not from the axle touching anything. The Toyota engineers who designed this could not have overseen such a simple thing...

If you think about it, by moving the pivot point up, you are actually increasing the distance of the axle from the gas tank, which is above the pivot point. I am personally not worried about any damage with this configuration, but whenever I'll have some time I will jack up the car, remove the springs and the shocks and try to swing the axle all the way to see if it could theoretically hit anywhere, just like Loren suggested a while ago. Until then I'm not losing any sleep over this

Another thing that crossed my mind: if you think about it, the springs are not compressed between two parallel planes (as they are in the front), but they are compressed between two planes at an angle. I'll try to illustrate this in a drawing below. What I'm trying to say is that if you push the spring straight forward, it's unlikely that the coils will slip or otherwise rub unevenly, but if you compress the spring at a certain angle, you may get some slipping - hence the clunking noise. By moving the axle up that angle will increase considerably, I was actually thinking how come the springs stay in there and don't just snap out

I have exaggerated the angles in my drawing to make the point, because I believe depending on the drop, moving the pivot point up is just a necessary correction. If the spring drop is less than the distance between the two pivot points, then the angle will be slightly increased (or decreased if you measure it against the vertical).

[evo165]

Originally Posted by fmicle

Yep, that's what I think as well, the noise must come from the coils themselves and not from the axle touching anything. The Toyota engineers who designed this could not have overseen such a simple thing...

If you think about it, by moving the pivot point up, you are actually increasing the distance of the axle from the gas tank, which is above the pivot point. I am personally not worried about any damage with this configuration, but whenever I'll have some time I will jack up the car, remove the springs and the shocks and try to swing the axle all the way to see if it could theoretically hit anywhere, just like Loren suggested a while ago. Until then I'm not losing any sleep over this

Another thing that crossed my mind: if you think about it, the springs are not compressed between two parallel planes (as they are in the front), but they are compressed between two planes at an angle. I'll try to illustrate this in a drawing below. What I'm trying to say is that if you push the spring straight forward, it's unlikely that the coils will slip or otherwise rub unevenly, but if you compress the spring at a certain angle, you may get some slipping - hence the clunking noise. By moving the axle up that angle will increase considerably, I was actually thinking how come the springs stay in there and don't just snap out

I have exaggerated the angles in my drawing to make the point, because I believe depending on the drop, moving the pivot point up is just a necessary correction. If the spring drop is less than the distance between the two pivot points, then the angle will be slightly increased (or decreased if you measure it against the vertical).

Bingo on the springs. As i mentioned it on my Tokico structs thread(post number 7).

http://www.yarisworld.com/forums/showthread.php?t=24722