Stacked Springs

[Ruhlman Race Cars]

We offer dual rate spring set-ups as well as bump stop and bump limiter combinations for late models and modifieds.

Give us a call and we can get your shock and spring program on track.

[Matt49]

Like clockwork, this topic comes up about once a month and invariably 15 people chime in and don't know what the difference is (or that there even is a difference) between a "stacked spring" and "dual stage" setup.
Stacked spring is just that: two springs one on top of the other. And it won't run or behave any different than the a spring of the spring rate determined by the formula that Egoracing posted UNLESS one of the springs coil binds and you should never do that intentionally (or on accident for that matter). This is commonly used on the LR where a soft spring rate is desired but can't be achieved with a single, long spring due to bowing. Contrary to what a lot of people think because they read it in a book somewhere, softer LR makes for tighter corner exit.
Dual stage involves use of a slider and lock nut so that one spring is taken out of the equation after a certain amount of travel (determined by location of the lock nut). This is commonly used on the RF to get the car to roll over on entry using the soft combined spring rate and then stand on the stiffer spring to generate LR dynamic bite on exit. It's an alternative to the bump stop setup that is loved and hated by so many.

[Egoracing]

The only time it will react as 2 springs is if you are running a limiter and lock nut setup. A dual stack is just a better way to run a softer spring.

[Dirt Man]

Running a stacked spring on the right front you get in the corner on the bottom spring. Get off the corner on the top spring. The stacked springs lets you get in the corner on a soft spring and off the corner on a stiff spring that loads the LF rear and gives you drive off. some one tell me if im wrong.

Your wrong!

[grasshopper]

Running a stacked spring on the right front you get in the corner on the bottom spring. Get off the corner on the top spring. The stacked springs lets you get in the corner on a soft spring and off the corner on a stiff spring that loads the LF rear and gives you drive off. some one tell me if im wrong.

[Egoracing]

Thanks For That .... But What Are The Advantages Of It? Does That Mean If You Run A 800/600 combo On The RF It Will Travel Like A Hard Spring But Act Like A Soft One?

The regular stack on the LR allows you to run a spring rate that would compress and bend if you ran a regular setup. A 133 LR would not last but the stack adds more metal to the spring which allows it to carry the weight without fatigue.

[cnorman]

Thanks For That .... But What Are The Advantages Of It? Does That Mean If You Run A 800/600 combo On The RF It Will Travel Like A Hard Spring But Act Like A Soft One?

[Egoracing]

(Spring X spring) / (Spring + Spring)= stack rate
200 X 400 / 200 + 400 = stack rate
80000 / 600 = 133.3333.....

[Dirt2727]

http://www.jimmyjudd.com/jimmy/spring_rate_cal.htm

[cnorman]

I Have Heard Alot Of People Talking About Running Stacked Spring. How Do You Callculate The Spring Rate And Is The LR The Only Place You Can Run It On? What About Everywhere Else? What Are The Advatages Of Running Stacked Springs? How Does It Affect The Car Verses Standar Springs?