SS Spring Rates - SS/1LE/BMR/Eibach/Hurst
 

I'll be continually updating this post - best to bookmark

Non-MRC SS Rates: 137 lbs/in (Front) 577 lbs/in (Rear)
Hurst: 150 lbs/in (Front) 420-550 lbs/in (Rear)
Eibach Rates: 160 lbs/in (Front) 121-691 lbs/in (Rear)
1LE Rates: 178 lbs/in (Front) 539 lbs/in (Rear)
BMR Rates: 175lb lbs/in (Front) 640lb lbs/in (Rear)

Eibach rear springs must be progressive.
Hurst are linear front and progressive rear.
BMR is 100% linear front and rear.
Factory SS and 1LE are basically linear

Ride Height (measured from center of wheel well straight down to center of wheel):

Factory SS (MRC): 15.5" Front / 15.6" Rear
Factory 1LE:
Eibach (Non-MRC): 14.5" Front / 14.5" Rear

https://c1.staticflickr.com/3/2944/3...93549798_c.jpg
1LE Spring Rate Front

https://c1.staticflickr.com/3/2896/3...63c212f5_c.jpg
1LE Spring Rate Rear

Anyone? I'm curious too. Is this information not out there? How are people choosing new suspension without knowing spring rates?

It's out there, but you have to check with the various suspension manufacturers. For example, when they say x part is 60% 88%, etc stiffer. They know the rates.

Some of the sites will post that as well. If you know how much percent stiffer it is, it'll give u a starting point to do some math.

I don't have a 1le model, but it's what I've donever with the LT and Ls models in the past.



Many on forums aren't as Tech oriented in decision. Moreso many people make their choices off visual pics and seeing how far spring lower various cars of similar models.

Here's the SS springs courtesy of Eibach

Non MRC

http://eibach.com/america/en/eibach-...s-2016-pro-kit

^ Interesting. Those are strange OEM spring rates, I never would have guessed those.

Angles and position

The front suspension on the 2016 has a lot of caster now.

Btw, Eibach should fix the typo on this line (there is an extra 2):
PRO-KIT rate 2: 121 N/mm (2691 lbs/in)

That is correct, that indicates the spring has two spring rates.

That's not correct. 121N/mm = 691lbs/in. There is an extra 2.

Good info, thank you. Two questions remain:

Rates for MRC FE3 (if there are any) and rates for MRC FE4

Nice to see factory springs are linear rate.

Regarding the rates, obviously angles and position matter greatly, but I can't recall seeing rates like that on any car. The caster is high, but not crazy compared to some other vehicles. The front rates are a little lower than I would have guessed, but not far away from typical. The rears are just weird.

Yeah - something is off on Eibach's site. Is N/mm right, or lb/in?

REAR
40 N/mm = 228.4 lb/in, not 121
121 N/mm = 690 lb/in, not 2691

I'm thinking that the correct rates are 40/228.4 and 121/690. This is obviously a progressive spring. Meant for comfort, not performance.

Also, I don't believe the stock spring is a straight 577 lb/in rate. It's probably progressive, too.

Bump up for 1LE rates

https://c1.staticflickr.com/3/2944/3...93549798_c.jpg
front

https://c1.staticflickr.com/3/2896/3...63c212f5_c.jpg
rear