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Discussion Starter · #1 ·
Hello all,

First off this question is about all the different spring rates the different vendors are offering for the Lotus Elige "Street" package. Some call it "Fast Road" or "Soft" setup. What I'm so amazed with is how different these set-ups are for essentially the same package. :shrug: Why the difference?

I'm trying to compare apples to apples and I'm looking for a set-up to work mostly on the street.

If you look at the three different vendor websites you can see what I'm talking about. In a nutshell the spring rate differences are:

Nitron's website = 400 lbs./front - 475 lbs./rear
Elise Parts = 325 lbs./front - 400 lbs./rear
Sector111 = 450 lbs./front - 600 lbs./rear

Across those three vendors, that's a 28% variance for the front and 21% variance for the rear.

Can anybody answer:
1. Why the difference for the same package?
2. Does anybody know the stock spring rates of the standard cars from the factory?

Any other insight or opinions?

Thanks!
 

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shay2nak
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1) Basically from what I know it's based on your aero/downforce level. For example, Sector has 3 spring rate combinations: the lowest being for a stock car, then one for medium aero mods and finally the highest spring rate for the cars with a lot of additional downforce.

2) stock IIRC ~280 & ~380
 

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A Microsoft update ruined the computer that has my primary batch of suspension programs and I am too lazy/involved to calculate by hand at the moment. However, I can tell you that the Sector rates, while roughly the correct front/rear balance, are a soft track setup but a bit on the stiff side for the street (I have several thousand miles on that setup). The other two set ups you mention are in the neighborhood of medium street, very soft track setup, but if you were to drive either on concrete slab surface roads you likely will notice a bothersome/uncomfortable ride motion as the front/rear ratio is too high. If you want to do a little research on this search on Maurice Olley (Olley ratio).
 

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depends on your needs and wants... personally i think the sector111's are too stiff for the street. great for the track though.
 

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Discussion Starter · #8 ·
A Microsoft update ruined the computer that has my primary batch of suspension programs and I am too lazy/involved to calculate by hand at the moment. However, I can tell you that the Sector rates, while roughly the correct front/rear balance, are a soft track setup but a bit on the stiff side for the street (I have several thousand miles on that setup). The other two set ups you mention are in the neighborhood of medium street, very soft track setup, but if you were to drive either on concrete slab surface roads you likely will notice a bothersome/uncomfortable ride motion as the front/rear ratio is too high. If you want to do a little research on this search on Maurice Olley (Olley ratio).
Very interesting read. Thanks for the info on the Olley ratio.
Attached is a link to some of his findings.
http://www.millikenresearch.com/MauriceOlleybyWFMilliken.pdf

If you notice on page 12 (in general terms) his findings are the front should be 30% softer.

Please understand this is for street handling as I have no idea how this translates to track setup.

Using these findings, Lotus sets up there springs almost exactly how Olley recommends.
STK - 200/285 = 30%
LSS - 220/314 = 30%
Exige track pack - 271/371 = 27%

Aftermarket on the other hand is questionable. As you say Formulabob, Sector111 are the closest.
Nitron direct = 400/475 = 15%
Elise Parts = 325/400 = 19%
Sector111 = 450/600 = 25%

I guess there really hasn't been much feedback on how people really think their street set-up is?
 

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Nitron fine tunes the springs and shocks to the specific model, year and use. I've ordered my 46-mm, 3-ways from them for a 2009 Exige Cup 260, for full race use, and got 550 springs in front and 700s in back. They want to know if you've got an Elise, federal Elise, RHD/LHD, etc. It was an extensive list. I would not buy Nitron shock from a retailer. I'd send them an e-mail and tell them what car I've got and how I plan to use it...

As a point of reference, I've replaced the Bilsteines that came with the car with the full race Nitron shocks... I DD my car and the ride became more controlled, yet more supple...that is the ride with the Nitrons is not as harsh as it was with the Bilsteins.
 

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I've got a few thousand track miles on the Nitron Singles using Sector 111's spring rates, and I like it a lot. The cornering on track is much better than on the LSS suspension, and I actually find it more comfortable on the street! The Nitrons dampen high frequency stuff less than LSS did, so a lot of the road vibration doesn't make it through, but they resist the lower frequency stuff a lot more, so the car turns in a lot better. Given the size of the springs from S111, the car did get lowered a tiny bit (somewhere a little less than 1cm), which makes scraping the front on driveways even easier.
 
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