Track Suspension

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Originally Posted by Loren

The solution to that would be a progressive spring, or a stack of springs designed to be progressive. I figured out how to do this on my Miata, but ultimately decided it was too expensive to bother with. You have to buy two springs instead of just one, and then you have to buy the couplers to go between them (unless you're really confident that your math is correct, then you could just weld them together).

For the back of the Yaris, if you did something like stacking a 6" 400# spring with a 2" 200# spring, the low rate spring would be mostly compressed under the weight of the car and as soon as you entered a turn, the outised spring would coil-bind and give you the 400# rate that you want for cornering. The inside spring would extend, giving you the full effect of the two springs, which nets a nice, soft 133# rate that would be in effect when that wheel came down to smooth things out.

Ground-Control sells the springs you'd need to do that if you wanted to go with 2.5" ID springs.

I have not taken any measurments, but I dont think there is enough room to do that with 2.5 ID springs as we would need perches as well. I think the whole thing would coilbind over bumps, which is fixing one problem and creating another. I would rather have a droop issue than an compression issue. I have no problems living with the horrible street manners of a track spring and damper setup however.

That would absolutely solve the problem if there was room to make it to work.