2morrow
DesignR/DriveR/RiceEatR
- Joined
- Nov 15, 2015
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- 5,987
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- Location
- NorCal Bay Area
- First Name
- Todd
- Vehicle(s)
- '16 Mustang GTPP
^^^ I run a similar spec on my track car.
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That's the difference between a dual rate spring that's more of a 'tender spring' vs one that's more of a 'helper spring'. It appears that Steeda has taken the tender spring approach here vs BMR apparently taking the helper spring approach with their dual-rate springs (the ones I have for my car have the car sitting statically at the firm rate and the 'soft' rate beginning at some amount of rebound travel).I think you mean compression travel, Norm. I was told it was about 6mm of shaft motion at the 800lb/in rate so around 10mm at the wheel before it engages the 1200lb/in rate. At equilibrium the car is sitting on 800lb rate.
A tender spring is meant to be used in conjunction with a much stiffer linear rate main spring.More info
Steeda’s Dual Rate Coil Springs
Steeda’s line of Dual Rate Coil Springs takes competition coil spring design to the next level. These springs essentially provide the performance of an optimized stacked spring set-up, but in a single spring. The Dual Rate Spring combines a relatively low initial spring rate, designed to absorb minor undulations and increase grip with a precise transition point and transition range to a secondary higher spring rate to improve roll control during cornering.
The precise placement of the transition range in the total spring displacement enables accurate shock valving because the initial rate is very linear and the transition range to the secondary rate is quite short.
Steeda Tech