Cutting my Eibach Springs...I know I know but this should work!!!
12-17-2007, 06:25 AM
#42
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Originally Posted by 97supratt
When did 350z's turn into civics? If you want the front of your car being 1/4" lower, just put a fat chick next to you. I'm sure that'll drop it down a bit. 
12-20-2007, 08:35 PM
#43
Originally Posted by Control 350z
ok as a former employee/designer for ground control i think i should have a better idea on how this works...
1) as for cutting the springs they will increase your spring rate as shown in below (thank you track04)
2) in about 85% of companies that make progressive factory replacement springs (ie: not coilovers) the progressive part of the spring (the top) is generaly used to only hold the car up with factory weight. they are generaly wound tighter and thicker than factory spring. this gives you the lowered stance and the ability to hold the car up.
3) if you dont know how spring rates work here is the basics if you have a spring with a rate of 400lbs it takes 400lbs to compress it 1" 800lbs for 2" and 1200lbs for 3". by cutting one linear inch off of the spring you have reduced the distance of compression so it will add more to your spring rate. you say you like the ride of the eibachs at their current setting. but you have no idea if you will like it with the higher spring rate HIGHER RATE + LOWER CAR = ROUGHER RIDE
4) also progressive springs twist more than linear springs as they are compressed, so by cutting part of the spring it puts more stress on the spring when compressed, wich as you should know causes the structural integrity to lower. wich can cause coil bind and even a coil snap, neither of wich are good for the shocks. and in a case of coil snap you can damage other parts of the suspension and wheels, not to mention the front end of your car slamming into the ground.
i may have forgotten somethings but it is 1am and im kinda tired
1) as for cutting the springs they will increase your spring rate as shown in below (thank you track04)
2) in about 85% of companies that make progressive factory replacement springs (ie: not coilovers) the progressive part of the spring (the top) is generaly used to only hold the car up with factory weight. they are generaly wound tighter and thicker than factory spring. this gives you the lowered stance and the ability to hold the car up.
3) if you dont know how spring rates work here is the basics if you have a spring with a rate of 400lbs it takes 400lbs to compress it 1" 800lbs for 2" and 1200lbs for 3". by cutting one linear inch off of the spring you have reduced the distance of compression so it will add more to your spring rate. you say you like the ride of the eibachs at their current setting. but you have no idea if you will like it with the higher spring rate HIGHER RATE + LOWER CAR = ROUGHER RIDE
4) also progressive springs twist more than linear springs as they are compressed, so by cutting part of the spring it puts more stress on the spring when compressed, wich as you should know causes the structural integrity to lower. wich can cause coil bind and even a coil snap, neither of wich are good for the shocks. and in a case of coil snap you can damage other parts of the suspension and wheels, not to mention the front end of your car slamming into the ground.
i may have forgotten somethings but it is 1am and im kinda tired
1. You did not bother to look at what the op intends to do, cutting a fraction of one active coil will have little impact on rate, go back and math out what he proposes to do. I don't have access right now to a set of oem springs our I would.
2. Lets draw a line of distinction between coil bind as the method of rate change vs what I see as a possible suggestion that the majority of progressive springs change rate via wire diameter change at the top of the spring. The majority use coil bind not wire diameter, the other's use differing wire diameters (tapered as in like Kw front, Basic front, HKS rear RS/LS).
3. Still goes back to not really understanding what he intended to do. Your description of a progressive spring doesn't correlate with what your saying will happen to ride quality since we are talking about a tiny fraction of one active progressive coil that will bind to yield to the higher rate anyhow.
Still doesn't mean I'd cut because I certainly would not.
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