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Coil Spring Rate
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 Tru-Coil Spring 5"x13" Coil Spring IMCA UMP 200 lb Rate  US $41.99
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 Tru-Coil Spring 5"x13" Coil Spring IMCA UMP 225 lb Rate US $41.99
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Here are some more information for Coil Spring Rate:
Megan racing coilovers only come in 4 lines: the Acura Integra 1990 to 2000, the Honda Accord 1990 to 1997, the Megan racing coilovers for Honda Accord 1998 to 2002 and the Honda Civic or CRC X or Del Sol for 1988 to 2000. The Megan racing coilovers for the Acura Integra models of 1990 to 2000 are made of 6061 CNC machined aluminum sleeves with SAE 9254 steel coil springs. These offer a spring rate of 450 pounds per foot on the front and 350 pounds per foot on the rear. This model of Megan racing coilovers come in red with a one year limited warranty and has all the instructions and hardware you will need for installation. This model of Megan racing coilovers reduce hop and helps with weight transfer during the time you speed up. There is an adjustable drop from zero to 3 inches, and reduces the actual fender gap that is commonly seen. The Honda Accord 1990 to 1997 model of Megan racing coilovers is constructed of the exact same materials as the above mentioned model. These also offer a zero to three inch drop on suspension and come with a hard plastic cap to keep shock failure at bay. These can be found for about $110 a set.
The Honda Accord 1998 to 2002 sets of Megan racing coilovers are great for street use and offer a higher spring rate which helps in turns and weight transfer. This is another model that offers the zero to three inch drop rate, but does not come with the plastic caps. This model can be found for about $110 online. The Honda Civic model of these coilovers does come with the plastic caps but does come with a spring rate of 450 pounds per foot on the front and 350 pounds per foot on the rear.
Tein coilovers are known for their excellent construction and their accompanying Tein coilovers EDFC. EDFC is the electronic damping force controller, which makes the driver able to control the damping by a motor installed inside of the shock absorber while in the seat driving. There are 9 types of Tein coilovers: SS-p, Basic, Flex, HT, RS, RE, RA, CS and SS. The SS Tein coilovers come with the shock absorbers, main springs, lower spring seats and seat locks as well as all accompanying required hardware. The Tein coilovers CS type are made to use a hard rubber mount to dampen noise. These are able to be overhauled and use a mono-tube design. The RA Tein coilovers are made for racing or very experienced drivers. These are made for the World Rally Championship as well as endurance racing. The RE Tein coilovers are made so that ride height can be adjusted with the lower bracket. This is one of the only suspensions that can be changed for weather conditions. RS type uses the separate compression and rebounds, so that any track can be met. HT and Flex both have ease of use stamped on them because they offer different grip levels and take into consideration the road surface.
Megan Racing Coilovers and Tein Coilovers.
Why Mattress Ratings are so Useful
Mattress ratings are used to differentiate different kinds of mattresses. Mattress ratings help people to select suitable mattresses. Ratings also help in categorizations of mattresses such as Platinum, solid-gold, platinum plus, gold and bronze; the platinum is one of the most preferred mattress ratings.
The work of mattress is to provide support during the sleep; they are used to reduce stress and strain on the body. The mattress ratings are useful to select your favorite mattress, the type of mattress selected by you determines the kind of support you want from mattress. The innersprings coils of standard mattress provide necessary lift to counter gravitational pull. In the case of waterbed, water gives total contouring and support to our body. The tamperproof mattress is useful to tackle body weight and heat to give complete support.
Mattress ratings are also useful to determine advantages and disadvantages of each kind of mattress; this will depend on the dependable source of mattress. Mattress ratings are used to determine the level of comfort that can be got from different types of mattresses. These mattresses are adjustable with the help of innersprings coils and varying the amount of padding. These mattresses use fabrics for as bed covers. The firmness and softness of mattress does not affect the level of support get from mattress.
Mattress ratings are used to determine quality of mattresses such as standard mattress is more comfortable than softer bed. The difference between the standard mattresses and softer beds is the quality of materials used to make these mattresses. Sometimes mattress ratings help to determine the cost of mattresses, the cost of mattress will determine by the material used to make mattresses. The material is placed on the top of the springs; sometimes the numbers of coils are used to determine cost of mattress such as mattress having large number of coils is more comfortable and more costly than other mattress.
Stearns and foster are some common brands of mattresses, these mattresses do not consider coil counts. These mattresses are made by heavy metals. Therefore, they provide more support with lesser numbers of coils. These mattresses are made by excellent support systems.
Aerobed mattress is another type of mattress that gives support by using air.
The air in the chambers will determine the softness of this mattress. The quantity of air used in mattress will decided by different levels on the different sides of the bed. This will allow users to choose their own comfort level.
Waterbed mattress is another type of mattress; they give support by using water instead of air. The water in the chamber will determine the softness of this mattress. The quantity of water used in mattress will decided by different levels on the different sides of the bed. This will allow users to choose their own comfort level. Most waterbeds look like standard mattress. They are based on older water balloon models. These mattress models provide wide selection of mattress; they are costly but easily available in the market.
About the Author
Muna wa Wanjiru Has Been Researching and Reporting on Mattress For Years. For More Information on Mattress Ratings, Visit His Site at
Calculating spring rates, force and length?
I require a car spring to take a corner weight of 571kg and compress the spring to 242mm at rest. I also need it to compress a further 35mm to 207mm by dropping the vehicle 100mm (ie driving off a kerb). Therefore I need the force as it hits the ground to calculate the spring rate to compress it 35mm.
From this I need to then work out spring free length and number of active coils; the 2 variables as I see it.
I do not know strength of steel normally used but do know the internal spring diameter is 75mm and the maximum wire diameter can be 15.5mm.
(My initial calcs show a spring rate of 536lb/in with a spring free length of 331mm and 8 active coils. But this may be completely wrong).
Had a good thought about your problem for almost a day now. Very interesting problem!
The hardest part is finding the spring rate. Then again, it depends how you model it. I don't see why you can't use work-energy principles. Anyhow, the most accurate way, in my opinion, is by using knowledge of free-underdamped oscillations. Number-crunching too intense - I don't have time (and rusty memory too) to do that sorry. But I'll outline what I would do.
When an equilibrium system is disturbed it must subsequently go through vibrations.
The instant when the car drops down from the kerb the spring is extended by 100m which in turn decreases the compression and this makes the car drop down into it as the forces (mg and kx) no longer equate to each other. The car does not free-fall since the spring would still be compressed.
If we isolate the spring the situation would be like as if the spring never moved but only the mass (car) is pulled upwards by 100mm from equilibrium point (when the spring was 242mm). This assumes the wheel instantly touches lower-ground when it rolls off kerb. If there were no damping the mass would compress 100mm pass the equilibrium point and oscilation would continue forever - the passengers won't like that.
The first "overshoot" peak will be 35mm as you've stated. You could calculate "backwards" from using the peak values (The first inital peak of 100m and next opposite peak of 35mm) to calculate the natural frequency which equates to sqrt(k/m). M is the mass and k the spring rate. You might also need to calculate the damping cooefficient.
After that I think it pretty much straght forward.
G = 78GPa (steel rigidity)
d = 15.5mm (wire diameter)
D = 75mm (coil diameter)
n = no. of coils
n=(Gd^4) / (8kD^3)
And from initial conditions of spring, x0 uncompressed spring, x1 equilibrium spring length.
ke=mg
k(x0-x1)=mg
k(x0-242mm)=571g
x0 = [571g+k(242mm)]/k
As you see the real problem is finding k! :[
----added----
I varified that stiffness of spring is dependant on the damping of the system. Which is obvious really. Stiffer means lesser the damping and vice versa. Your problem cannot (if you want the problem to be solved with a the more real-world model) be solved without information about damping of the suspension system.
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