Help G37S factory spring rates?
Registered User
Joined: Dec 2008
Posts: 344
Likes: 2
From: the Big KY
they do make progressive springs, stock springs are usually always progressive. The eibach pro-kits are progressive based as well, you can usually tell by how they are wound. Linear springs look like the ones on the megan coilovers. Progressive springs have a varying size to it and linear are just straight up. Not trying to knock your fact or anything, just saying what I have learned. I just dont understand how progressive springs are measured, since they have a range of spring rate.
Stock springs are usually not progressive, at least any I've seen. You can tell by looking at the spring. Look at how the coil diameter and wind is constant from top to bottom. I looked online at the Eibach springs. Progressive rates can be accomplished with multiple springs stacked on top of each other, each with a different rate, or by variable winding, like the Eibachs.
You measure the rate like I explained earlier. Its usually a ratio, ie.. The first rate compresses at say 300lb/in, the next rate compresses at 600lb/in, the next at 1200lb/in, etc. In the case just described its a 2:1 ratio. Hope this helps.
I dont care if your male, female, or trans. Your one of those females who comes into a males domain and expects special treatment.
What are we all supposed to bow down to you. 
You seem to think so by your "I'm a F'ing female, dont call me bro!" gig. The question wasn't intended for you, so stop reading this post.
Unlike you, he is capable of working on his own car and reqeusted the information.Since no one else answered I did. Hate me becaulse I have the knowledge. I care NONE!!!
What are we all supposed to bow down to you. You seem to think so by your "I'm a F'ing female, dont call me bro!" gig. The question wasn't intended for you, so stop reading this post. Unlike you, he is capable of working on his own car and reqeusted the information.Since no one else answered I did. Hate me becaulse I have the knowledge. I care NONE!!!
Damn! Nice of such a newb to come on the forums and start this ****.
Alright guys, please calm this down.. let's move on with the subject at hand 
So really now the questions is.. Are the stock springs progressive or not. Based on the picture I've seen I can say that they are not. Am I wrong?
So really now the questions is.. Are the stock springs progressive or not. Based on the picture I've seen I can say that they are not. Am I wrong?
Registered User
Joined: Jul 2008
Posts: 98
Likes: 0
From: SoCal
I dont need to make spring to know that dude. Im an engineer and for what I paid for my education if I dont know basic spring force equations I dont deserve to be an engineer. If you dont want to know that much info about springs then dont read the post.
I try to educate ppls when they ask questions and I know the answer. I give them real answers and not some biased bs because I lack the knowledge.
I try to educate ppls when they ask questions and I know the answer. I give them real answers and not some biased bs because I lack the knowledge.
Thanks for the education, Mr. Engineer. You gonna tell me if I want to know how much a pound of feathers weighs, I should put them on a scale? Don't talk down to people on the interwebz, it's not nice.
Registered User
Joined: Sep 2008
Posts: 5
Likes: 0
Just a note. I've talked to Eibach and Tein and neither company seems to be able to tell me what the factory spring rate is for the sport springs. Tein is unofficially now in the last stages of development and production for their S-Tech and H-Tech lowering springs. I was told possibly April?? I'll have to wait and see. Any thoughts on how the two brands stack up against each other? If the factory springs are in fact linear, then measuring the rate should be straight forward. Then you just need to figure out how to compare the linear factory springs to the aftermarket progressive springs.
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