The formula is: 1/equivalent spring rate = (1/spring rate heavy) + (1/spring rate light) And, of course, this formula breaks down when either spring coil binds. Coilover Dual Rate Nuts In a dual rate coilover setup, the softer spring should not be less than 70% of the stiffer rate. MRP Suspension - Mountain Bike Spring Rate Calculator. Spring Rate = force or weight to compress the spring 1 inch. Dual Rate Spring Rates CSW Calculator Spring Rate Calculator ACF Front Rear CSW (lbs) WT (in) SUR (%) DT (in) BT (in) Notes Result Outputs Target Outputs Inputs IR DTt (in) BTt (in) Result Inputs Percentage of wheel travel desired to be available for droop. Availability Currently Shipping in 5-10 Days Price As Configured: $1,485.00 Select Shocks [what's this?] We need 120lbs, so we would need to shim it enough to give us the correct seat pressure + 0.025" (i.e. Here is the simple formula calculating Dual Rate Springs: (Tender X Main) / (Tender + Main) = Primary Rate. Typical stacked spring on a coilover setup. Use this handy garage door torsion spring winding chart from Garage Door Nation! Possibly, the most successful spring setup I ran to date was a 432 rate Crower dual spring, set at 166/425 on .600" lift. Custom Spring End Options to Meet Your Needs. Spring Rate = 168 0.450. Sprung Weight Sprung Weight = Corner Weight - Unsprung Weight. This will calculate the pressure of a spring at a lift inputed. Calculator for cone compression springs : Diameter of spring wire d 10-3 m: Mean coil diameter 2r 1 10-3 m: Mean coil diameter 2r 0 . (Identical Spring Rates) You have two identical springs with a spring rate of 30 lbf/in (pounds of force per inch). A spring's rate, or stiffness, is determined by the amount of weight required to compress it a given distance. MEDIA PARTNERS . Spring Rate = 373 lbs./in. This type of rising-rate spring is very common in motorcycle suspensions. A rate of 200 lb/in. The formula for this calculation is also provided below. spring rate calculator. Menu. Spring Calculator - TF Tuned are experts in mountain bike and bicycle suspension service and repair, including setting-up the for you and your bike. Keq = . So, when looking up E-5 with dependent MHA rates, the previous year's BAH rate table is used to determine MHA for the first seven months of the year. Record upper and lower spring rates. The secondary rate after the step up would be 250 or same as the main. lower spring. Suspension Spring Dual Rate Spring Stacker Chart Mar 01, 2006. Description. Not a Spring Rate of 600 lbs. Pac Racing Spring latest video. Compress it 3 inches, its Load is 30 lb., and so on. Lets say you have a spring with 150 lbs seat at 1.850" 435 at 1.250" and a 475 lbs./in rate How much seat pressure will it have at 1.900" or 1.930" installed height? You can calculate the slider travel for a given shock travel to find out when the secondary rate will take effect. Use this valve spring calculation tool to enhance and fine tune your spring and cylinder head . Your motorcycle needs a spring that fits your application, has the correct rate for your use and has sufficient travel to operate through the full stroke or travel of your suspension. The overall diameter (D) of the coil spring is a very important factor in determining the spring rate. Force Ratio (Fr) = D1/D2Weigh your car to determine the weight on the wheels (W). Distance (dist1, dist3, or dist5) (in) Distance (dist2, dist4, or dist6) (in) Droop % Spring angle from vertical (Degrees) Calculate Spring Rates Spring Rates (lb./in) Calculate Dual Spring Rate Main Tender Individual Spring Rates (lb./in) Primary Spring Rate (lb . * *Comp Cams lists the spring rate at 370 lbs./in. Spring Rate and compressed 1 inch, its Load would be 10 lb. It's important to note that this type of progressive spring is more oriented towards high-performance driving. U57: Tape Player: U63: Radio (Pushbutton) U69: Radio (AM-FM) U79: . /> Compress it 2 inches, its Load is 20 lb. Students who only take online classes or attend a foreign school receive a different rate. To help you out of this fix simply type in your measurement into the calculator below! Custom Dual-Pitch Compression Springs Definition - Custom open wound compression springs whose coils have more or less pitch in between them on one side of the spring's body. Dual Exhaust (L78) N40: Power Steering: T60: HD Battery (RPO Eng.) This eliminates any movement on the part of the top spring and in effect uses only the lower spring. Unsprung Weight is the weight of the tires, wheels, knuckles, hubs, axles, and half the weight of the springs, shocks, control arms, and/or links. Progressive-rate springs can be classified into two subtypes: a constantly increasing rate and a "dual-rate" spring. Skip to main content. Cart. My Basket 0.00. But if we're being honest, you're not always going to remember that useful trick the next time you need it. Example B. If the valve setup has more than one spring, each spring will need to be input to find the pressure on each one. Voting is open for August's Cummins of the Month Challenge! the difference . You should end up with two sets of numbers that are identical. When in doubt, choose a lower spring rate. Definition: Spring rate, also known as spring constant, is the constant amount of force or spring rate of force it takes an extension or compression spring to travel an inch of distance or, in the metric system of measurement, a millimeter of distance. Full Turns. However, they spec the spring out with an installed height of 1.950", which puts the seat pressure at 116lbs. Round, Rectangular, Square & Special-Section Wire. You can also have a dual rate spring which is two coils mounted to the shock. There we go! SP1 Rear Passenger Side Suspension Spring (SM-04351R) 0. Spring Rate Calculator. OEM Old man EMU XJ is supposedly 142-147 lb/in rate. 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. D1 = The distance from the pivot point of the a-arm to the mounting point of the spring/shock.D2 = The distance from the pivot point of the a-arm to the center of the ball joint.Divide D1 by D2 to calculate the force ratio (Fr). Mega Cab dually spring rate problem/question? True Dual Rate Coils Durotrak equipped front track bar Specifically tuned shocks for True Dual Rate Coils Height adjustable bump stops The MetalCloak Game Changing Duroflex Joints are the only vulcanized [click for more.] Total Wheel Travel (in) Sprung Weight of corner (lb.) Calculate spring rates required to give target wheel rate and step-up ratio. SPRING RATE CALCULATOR Finds the Primary (overall) beginning spring rate when using dual-rate coil-over springs. A rate of 200 lb/in Designed for a 3-Inch deflection When deflected 3-inches the spring is supporting 600 lbs Therefore, the spring has a Load Rate of 600 lbs. Valve springs with a higher spring rate will create greater Open Pressure, compared to Seat Pressure. If I read your post correctly you achieve 50% sag or 4" with a 200# spring with 0 preload, that is 800# load on the spring at ride height with 50% sag. spring rate. . With vehicle at full droop: Measure shock shaft showing. If you know the rate and open and seat pressure? For dual rate coilovers you will need to multiply the spring rate calculated above by two to get the required spring rates. If you plot the curves of inertia force and spring force throughout the cam rotation, the spring force should be greater than the inertia force at every point (say 10% greater). The SPRUNG WEIGHT is the weight that each shock is supporting (i.e., the corner weight less unsprung weight). When calculating fork or shock springs necessary travel, any spring preload must also be considered. For pistol recoil springs, the listed load is for how much the spring compresses when the . **The lighter rate spring always goes on top. Once this happens, any additional deflection is only moving one spring, so the effective spring rate increases to the active spring's rate. This calculator computes all parameters (spring rate, maximum load, maximum stress, solid height, coil pitch, coil angle, wire length, resonant frequency, shear modulus, and spring mass) related to a compression spring from basic geometry and material data input.. Such as road-racing and autocross driving. Now in this Dual Spring Rate system the first 2 inches of travel you are feeling 120 lbs spring rate in your butt. Step 1 - Determine Sprung Weight Corner Weight: (1/2 the front or rear weight) Use an accurate racecar scale that will weigh each corner of your car. Nice and plush. For our calculator, 0 degrees is straight up and down. Spring Rate Conversion Calculator When it comes to converting kg/mm to lb/in or vice versa, all you need to know is that 1 kg/mm equals 56 lb/in. Save Share. If the coilover is dual rate, install the slider first before mounting the lower spring from the lower end of the shock. Let's add up the total pressure when compressed. Given the cam lift profile, you would then calculate the spring force at each point. In a scenario where a wheel is lifted from the floor, the damper extends fully and experiences full droop. Motion Ratio Motion Ratio = (Dimension A / Dimension B) * sin (Spring Angle) Latest Posts. Add 5% for a heavy rider (+200lbs.) spring rate.The 934 spring is 35 mm (1.37") longer than the 930 spring. Eibach spring rate calculator Project Cars, Tech January 11, 2017. The further away from vertical, the higher the angle number..10 degrees, 15 degrees, etc. The last 6 inches of travel you feel a 300 lb single rate. Loosen spring adjuster nut until springs start to rattle. $27.46. Play with it. 17" length 5.25" diameter. The important parameters are: L = Free Length of The Unloaded Spring (m) G = Shear Modulus of Rigidity of Material d = Wire Diameter (m) D = Mean Diameter (m) 240 lbs for the first two inches, 1800 for the last 6 inches is a total of 2,040 lbs. The resulting Keq is the new rate for the two springs in series. Dual pitch compression springs are also known as double-rate springs, double pitch springs, and progressive rate springs. calculator - combined rate of two springs in series formula for springs in series: final rate = (rate 1 x rate 2) / (rate 1 + rate 2) 25.00 50.00 25.00 75.00 100.00 125.00 150.00 175.00 200.00 225.00 250.00 275.00 300.00 Valve Spring Pressure Calculator: Installed Height Spring Pressure: PSI Installed Height of Spring: Inches Open Spring Pressure: PSI Not a Spring Rate of 600 lbs. OME 934 coils: 180 lb. From the equation, it can be noted that a larger diameter will yield a weaker spring. multiplied by two is 220 lbs./in. Once the Secondary Spring goes to block or the slider hits the stop ring (called Transition Point) the load deflection characteristic changes solely to the rate of the Primary Spring. Ironically, this was with the standard Comp 854 lifters. .007 to .625 Inches In Spring Wire Diameter. Reap the benefits a Shock Therapy dual rate spring kit can bring to your machine, it will reduce washboard chatters, bucking through whoops, increase bottom out resistance and ride height with this kit. or using Rog's numbers (150 x 250) / (150 + 250) = 93.75 Primary Rate. Formula (s) to get Stacked. Request Catalog. Tender springs are a band aid for the wrong spring rates. All you need is your shocks installed and two springs. Your car may suffer from an unusually high or low ride height. Spring Rate = (273 - 105) 0.450. Corvette Track 1 Modular Spindles | Fits C5 and C6 1997-2013. Now it is time to subtract the final load reading at maximum travel from the load at normal ride height and divide by the maximum travel to get the average spring rate in pounds per inch. HOME; ABOUT US; SHOP. In determining the total number of coils in the spring, the calculator assumes that the ends of the spring are squared. -One kit includes 2 tender springs,2 main springs,2 spring dividers,2 adjustable crossovers technical info. It is easier to achieve handling and performance with a lower spring rate and a "stiff" stabilizer bar or shock. Subtract each set of increments to find the gain in load versus distance. The main purpose of the helper is to keep the main spring engaged with its upper and lower seat at all times through full suspension travel. faster. The second or secondary spring rate kicks in when the floater engages the lock ring. You are trying to tune with springs. How does it affect performance? Unsprung Weight is the weight of the tires, wheels, knuckles, hubs, axles, and half the weight of the springs, shocks, control arms, and/or links. Spring Rate = Static Load / Shock Ride Height. So if you had a spring with a 10 lb. 1: Positive Coilover Spring Preload: With vehicle at ride height: Measure shock shaft showing (pretend like bottom out bumper doesn't exist) Measure coilover threads showing above spring adjuster. For instance, the 150/150 and 125/175 have almost the exact same combined spring rate of 75 lbs. What . Jump to Latest Follow Hey everyone! These are just some of what Cogent Dynamics take into account . Furthermore, the effect of the diameter change is to the third power. The BV calculator, provided below in MS Excel spreadsheet form, performs . $27.46. Our springs comes in a few different colors, with the typical and well recognized hlins yellow the most common. DOWNLOAD. Your lower springs should be 2" longer then the travel of the shock and the top spring should be the same length as travel. A Dual Rate spring configuration will have a Primary Rate that is a combination of the Main Spring and Tender Spring. Ridetech Acquired by Fox Factory Holding Corp. (FOXF) Leave a Reply Cancel reply. Our springs are developed specifically for hlins shocks and and a large number of spring rates are available. See the chart below for an example: Get rid of the collapsed upper spring and ride in comfort with you the Shock Therapy Dual Rate Spring Kit! Shop Dual Rate Coil-Over Springs Basic Specifications of Dual Rate Coil-Over Springs Free Length Range: 12 to 16 Wonder how changing installed height changes the seat pressure. By picking and choosing the two springs in the assembly, we can give you a fairly broad range of spring rates and rate combinations. Dual springs have an outer and inner spring, while triple springs add a third in the middle. Based on this information, you can place the lock rings at the proper location. Dual and triple springs are popular for performance applications because of the high loads multiple springs . Total Riding Weight (pounds): The rider's weight with riding gear (average 5lbs for riding gear weight) Rear Weight Bias (percent): The standard formula is based on a 60:40, Rear to Front weight distribution. SUPPORT THE COMPANIES THAT SUPPORT US . OME 930 coils: 160 lb. 1.75" of lift on XJ. We're always glad to help. Notice that the first or primary spring rate is a combination of the two springs working together. Set the dual rate stop to . PARTS SHOP . Call +44 (0) 1373 826800. Using the example above, 110 lbs/in. This is one of the reasons folks have a hard time with the generic 345 springs and body .

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