Alignment After Eibach Install
Lead Lap
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From: NorCal
Lexus Test Driver
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From: CA
Lead Lap
Joined: Jan 2006
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From: NorCal
ahh, just checked the eibach page - seems they use progressive and not linear springs...so I don't think my comment applies anymore 
so no idea on the engineering, but from having them on my car I know they did settle after about a week or two and were lower than the day they got installed.
so no idea on the engineering, but from having them on my car I know they did settle after about a week or two and were lower than the day they got installed.
The difference is not the material, and the comments about Young's modulus and Hooke's law both apply, just to different parts of the process.
Progressive springs are wound so the end that is wound closer goes into bind sooner. When those coils bind, the effective length of the rod shortens and the spring's rate rises. Linear springs are wound at a constant pitch, so the whole spring goes solid when it hits bind.
It's very important to understand a spring is just a torsion bar wound in a coil for packaging convenience. This is why cutting a spring raises its rate - the torsion bar is shorter, so the rate must rise. This is also why using a variable pitch when winding the coil results in a progressive rate. As the spring goes into bind, you progressively shorten the length of the torsion bar until the entire spring goes into bind.
Last but far from least, your dampers (shocks) hate progressive springs. There are no progressive dampers, so the engineer is forced to compromise damping rates based on a lot of factors, not the least of which is amount of time spent at a particular load. It's a big juggling match, and only rarely does it end up being good for the enthusiast. Far more often it is aimed directly at the "average" user who is most likely to complain.
Progressive springs are wound so the end that is wound closer goes into bind sooner. When those coils bind, the effective length of the rod shortens and the spring's rate rises. Linear springs are wound at a constant pitch, so the whole spring goes solid when it hits bind.
It's very important to understand a spring is just a torsion bar wound in a coil for packaging convenience. This is why cutting a spring raises its rate - the torsion bar is shorter, so the rate must rise. This is also why using a variable pitch when winding the coil results in a progressive rate. As the spring goes into bind, you progressively shorten the length of the torsion bar until the entire spring goes into bind.
Last but far from least, your dampers (shocks) hate progressive springs. There are no progressive dampers, so the engineer is forced to compromise damping rates based on a lot of factors, not the least of which is amount of time spent at a particular load. It's a big juggling match, and only rarely does it end up being good for the enthusiast. Far more often it is aimed directly at the "average" user who is most likely to complain.
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The difference is not the material, and the comments about Young's modulus and Hooke's law both apply, just to different parts of the process.
Progressive springs are wound so the end that is wound closer goes into bind sooner. When those coils bind, the effective length of the rod shortens and the spring's rate rises. Linear springs are wound at a constant pitch, so the whole spring goes solid when it hits bind.
It's very important to understand a spring is just a torsion bar wound in a coil for packaging convenience. This is why cutting a spring raises its rate - the torsion bar is shorter, so the rate must rise. This is also why using a variable pitch when winding the coil results in a progressive rate. As the spring goes into bind, you progressively shorten the length of the torsion bar until the entire spring goes into bind.
Last but far from least, your dampers (shocks) hate progressive springs. There are no progressive dampers, so the engineer is forced to compromise damping rates based on a lot of factors, not the least of which is amount of time spent at a particular load. It's a big juggling match, and only rarely does it end up being good for the enthusiast. Far more often it is aimed directly at the "average" user who is most likely to complain.
Progressive springs are wound so the end that is wound closer goes into bind sooner. When those coils bind, the effective length of the rod shortens and the spring's rate rises. Linear springs are wound at a constant pitch, so the whole spring goes solid when it hits bind.
It's very important to understand a spring is just a torsion bar wound in a coil for packaging convenience. This is why cutting a spring raises its rate - the torsion bar is shorter, so the rate must rise. This is also why using a variable pitch when winding the coil results in a progressive rate. As the spring goes into bind, you progressively shorten the length of the torsion bar until the entire spring goes into bind.
Last but far from least, your dampers (shocks) hate progressive springs. There are no progressive dampers, so the engineer is forced to compromise damping rates based on a lot of factors, not the least of which is amount of time spent at a particular load. It's a big juggling match, and only rarely does it end up being good for the enthusiast. Far more often it is aimed directly at the "average" user who is most likely to complain.
lo bux racer's answer's are always informative, but I fail to see how it answered Flipsonic's question... LOL
I would wait until the entire suspension settles in with the new springs. The springs won't change, but the bushings and upper spring perches will over a few hundred miles.
I would wait until the entire suspension settles in with the new springs. The springs won't change, but the bushings and upper spring perches will over a few hundred miles.
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