*CHANGED* the cut springs thread

[JDM]

LiU, can you prove this? I was pretty sure they are progressive...

[LiU]

I remember seeing several posts about this and they are linear. and in the suspension FAQ there lists only 1 rate for them (though it could mean we couldn't find more info). There might be some "dead" coils though. I'll try to find my stock springs and take a look, but don't count on it lol.

[JDM]

Ok, I remember reading that they were progressive rates. Maybe well never be sure of either... hehe

At least most aftermarket springs tell you the rate and spring type!

[offtheline]

You don't, that was the whole cause of the arguement.

I know... I was being facetious.

[Nismo_Freak]

Cutting a spring does increase it's spring rate ... the problem is in a 240 that has a MacPherson strut design you are lowering your roll center faster than your center of gravity. This in turn creates more pitch into a corner than at even stock height. Even the small increase in spring rate won't be enough to handle the change.

As for the ride, you can't get the spring to all have the same frequency. Often the rear springs end up with a higher frequency which makes the car feel like crap.

[Nismo_Freak]

It depends on the exact composition of the material. Getting the right aluminum plate last summer was a dizzying experence. There are tons of different types of steel from Alloy 625 Nickle Steel to 1095 Blue tempered and polished spring steel. The place I bought from offers 4 different types of carbon steel, I didnt even know there was more than one kind until I looked.

You would need a lab to calculate all of this correctly and precisely. Im sure you could get it close enough with educated estimates though :pface

Damn Fiss.. you gotta woody for steel dont you.

[Exar-Kun]

I got a huge assed "machinist handbook" that lists every type of steel, its E hardness ductilness, tensile and elastic strength and distortion under loads, and failure loads...

good stuff....

big book.-chetAlso: for a side comment, cust springs are bad. period, its a band-aide way to do something, and rarely works as planned.