traskw

When using stock springs with the TRD Performance Shocks is the ride height maintained?

2005 Scion xA

HATEnFATE

The Shocks do not set the ride height. The springs are responsible for that.

traskw

Not always the case. I've purchased Koni Yellows in the past and the struts themselves were shorter than stock, thus dropping the ride height even with stock springs.

HATEnFATE

The only way they should change the ride height is if they are fluid filled instead of gas filled and you're coils are tired....

traskw

Or if they are physically shorter. Which the Koni are. BTW, the best way to adjust ride height is not by springs, if we were talking full coilovers, you would ideally want to adjust the length (better coilovers do this), not the springs. The springs should be adjusted for preload, not ride height.

traskw

Perch height can also effect ride height on struts (creating more or less preload). I was looking for someone who has tried them and compared the length, since the length of the strut is the best factor to consider in regard to ride height.

HATEnFATE

You are correct in the idea that the spring perch could be moved to adjust the ride height without changing the spring, but on an xA/xB the rear uses shocks, not struts, therefor making a strut with a lower perch would only lower the front, and to adjust the rear you would need a short coil, which would completely throw off the bias in relation to the front.

So back to the OP, no, it shouldn't change the ride height on an xA/xB, because the rear is a shock and the ride height is fully dependant on the coil.