Swapping from a 500 horsepower small block with nearly 50/50 weight balance to a 970 horsepower big block and a 200-pound nose heavy-stance has shown me that standard 90/10 front shocks are not optimum for the car. Coil-overs should be mounted so that they are compressed 1/3 of their stroke at ride height. Just beware how those choices affect your spring rate, damping, and shock efficiency. One fix is to position the links so that the right side link is from 3º to 5º higher than the left when the chassis is at ride height. Exploded view. Coil springs themselves are a simple item, but their characteristics are often misunderstood. The rear end is from a '71 Nova and is supported on parallel leaf springs. Please see figure 2. Sometimes I see one shock … The rear shocks are positioned at 40 degrees forward of vertical on both rear wheels at the top. Post your decision whichever route you go. © 2021 Four Wheeler | MOTOR TREND GROUP, LLC. Unlike the Ultra 4 shock configuration, the spring rate and valving will have to be relatively higher since the rear axle is pushing on the shocks through the mechanical advantage of the trailing arm as a lever. Our blocks also feature built in centering pins and a tough black e-coat finish for extra durability in even the toughest conditions. Rear Shock Angle? Unstable Turn Entry. False c.) Not Sure. Figure 3: Lower Control Arm CAMBER ADJUSTMENT Camber is the angle between the wheel plane and the vertical, perpendicular to the pavement. This system replaces the old twin-shock rear suspension with a mono-shock design that utilizes an off-the-shelf shock absorber from a modern sport bike. AVAILABLE COLORS: CORAL BLUE TR GREY STEP 1. Increase the Rear Tire Stagger. For example, if the shock eyes are 10" compressed and 13" fully extended, the stroke would be 3". Are the shocks adjusted to the softest preload setting? Sounds to me like your shocks are mounted on an incorrect angle which is not allowing them to compress properly. The resulting leverage effect is why spring rates used for A-arm front suspensions may exceed those used on comparable live, straight-axle suspensions. The thicker the rod that is used, the higher the spring rate, or the stiffer the spring. have their rear shocks mounted at about a 30-degree inward (inward = leaning toward the differential, not forward or aft-ward) angle, while others have their shocks mounted at a 20 degree angle or so forward and/or aft ward of the rear axle (e.g. Drop [mm.] Some vehicles (early model Land Cruisers, etc.) In this way a 16-inch-travel coilover may yield about double, or 32 inches, of rear wheel travel. Occasionally, a very light weight top spring will be used and is fully compressed at ride height. True b.) Take as look at some of my soft-tail builds and the shock angles. For 12 degree or more banking: Increase the RF Spring Rate. Wheel Base [mm.] Patrol Carbon GX $4,999 USD. This is a dual-rate shock with the shorter, lighter rate coil on top. I did some more research and what Ember said was exactly true, and it seems up to a 45 degree angle is the steepest listed (and should be right about where I am), and at that steep of an angle it increases the stiffness of the shock by 2x. the steering axis angle multiplies this weight jacking effect. It's sometimes best to cycle the suspension and check dimensions before choosing shocks. On the other hand, increasing the overall diameter of a spring coil or adding more turns to a spring makes the spring rate lighter. First, available space… regardless, if this … NR. Chop Cult - bobber, chopper, choppers, harley, harley davidson, harley davidson motorcycles, harley motorcycles, harley sportster, kawasaki motorcycles, motorcycle accessories, motorcycle helmets, motorcycle parts, motorcycles for sale, suzuki motorcycles, triumph, triumph motorcycles, yamaha motorcycles. Call for specific pricing and design assistance. Honestly I was more worried about making sure to get good weld rather than the geometry of the thing. Unless the shock is extraordinarily stiff, this is not the case. You can increase rear stagger and/or trail the right rear tire slightly to help the car turn when you traction up the rear. Chevy, Jeep CJ’s, etc.). On most street rod applications a mounted angle of 15-25 degrees is preferable for great handling. To circumvent this engineers use levers and play with angles (virtual pivot point). a.) By using this modern shock technology combined with a mechanical linkage design, we were able to create a system that greatly improved the progressiveness and travel of the rear suspension. They work best with a shock that has the necessary damping to control the springs in rebound. Decrease the Angle of the Upper Trailing Arm. Coilover shocks can have one, two, or three coil springs in a stack. With levers you can place shock where you want, but some places makes more sense as they apply forces where it is easier for the frame to bear them. Leaf springs are large and they need space to work. Explaining how the most popular designs work, plus their potential advantages or shortcomings However, before we delve into the various types of rear suspension, there are a couple of important subjects we should first mention-scrub line and pinion angle. It has a pair of 9N/mm forks springs, so to get the same spring rate at the rear axle as the front, the shock spring needs to be twice as stiff because there is only one shock but two fork springs. Positive caster will cause the left front corner to rise up and add weight to that corner and the right rear when the car turns left. The use of coilover shocks, their spring rates, and their mounting geometry can have a big impact on how the overall suspension performs. See all 19 photos Typical passenger vehicle grade units. The shocks are new but nothing special. Not only are your spring and oil choices important factors in how your vehicle will handle, but they also govern the position in which the top and bottom of your shocks are mounted. This will help you maximize travel, and also account for any unforeseen mount changes you may have to make. A wide usable sag range of 25 - 35% allows the rider to tune the feel of the bike; from poppy and playful, to planted for plowing. Standard 4-Bar Rear Suspension Package. at that steep of an angle it increases the stiffness of the shock by 2x. The rear shocks on a 55-57 Chevy attach to the body through the trunk floor sheet metal and even though this area is beefed up from GM to take the up and down abuse an upper shock mounting point would dish out it was never designed to support the car. On this Ultra 4 class buggy, a single 18-inch-travel coilover is used near the rear axle. Decrease the Rear Weight Bias. Patrol Carbon XO1 $6,199 USD. Adding more rear toe-in will add overall rear traction, both in a straight line and during cornering. This increases handling by limiting side to side movement, which will decrease body roll during cornering. The most substantial change I’d make is moving the rear shocks to a softer setting when I run off a transbrake versus foot braking the car. In the initial portion of the travel stroke, both springs are being compressed, but in different amounts based on their stiffness. In general, for maximum stability, shocks should be mounted as far outboard as reasonably possible. Shock Angle: Shock angle refers to the mounting position of the shocks on both the upper and lower mounts. Each is just a bar of spring steel rod wound in a circle for compact packaging. I am planning on doing something similar on my xs650 so I am interested to see what direction you go. You have bar length, bar angle, and valving in your shocks. http://www.visualimpact2.com/Merchandice.html, http://www.proshocks.com/calcs/anglefirst.htm. On many of our rear blocks, we incorporate the factory style bump stop landing which is critically important. Once the lighter rate top spring is completely compressed (coil bind), the spring rate will increase to that of the higher rate bottom spring for the remainder of the shock stroke. For many applications, the 4-bar suspension is preferred. It does not appear so in the picture... Takes very little engineering to get them to work properly, you just need to be able to use a tape. Coincidentally, shock lengths needed for IFS are less than those needed on comparable straight axle rigs, but spring and damping rates of the shock will be higher. 38 H. Trail [mm.] The spring has a rating based on how much weight is needed to compress it 1 inch. In fact the stock spring is about 90N/mm, because with a rider on board there is more weight at the back than the … Steering inclination angle has an effect over the positive caster during steering. Acknowledgements The success of our project has … On an IFS setup, the coilover often attaches somewhere at a mid-point on the lower A-arm. Rear Toe The rear of the car is much different, as toe-out is never used. In this case, the shock is being used as a single rate coilover and the light spring is a tender spring used to keep the main spring from rattling around when the shock is fully extended. and vice versa when the steering is cranked to the right. D. Head Tube Angle 71 degrees E. B.B. Typically, this measurement will fall somewhere between 70 and 90 degrees. Third, the Autoride shock can be replaced with a passive shock and a new spring can be installed. 425 G. Fork Rake [mm.] It is also possible to install a shorter, 205mm x 57.5mm stroke shock, to decrease the rear wheel travel to 140mm. A stiffer shock helps to load and unload a tire quicker than a softer shock. 22 F. Chain stays [mm.] Front amp; Rear Shock Absorbers Sets Kit ACDelco GM OE For Cadilac CTS FE4 F55 RWD $1496.19 Front and Rear Shock Absorbers Sets Kit ACDelco For Sierra 3500 HD Torsion Bar $147.95 Front amp; Rear Shock Absorbers Sets Kit ACDelco For Chevy Avalanche GMC Yukon $289.95 Suspension can be everything in the off-road world. thanks. Smaller more compact trucks and SUVs sometimes don’t have enough room to run leaf springs, especially in the front.” Increase the RF Shock … Less rear shock compression; Less top link angle (less anti squat) More diagonal weight; Less RR trailing arm angle; Shorter RF A-arm; More toe out; More positive caster; Add anti dive ; Stable Entry / Tight Cut Zone. My question is; What is the optimum angle for a shock to be positioned for best performance? 1040 1056 1080 1098 Rear Travel 75~95mm (3~3¾ inches) - Pag. Angling shocks inward can also provide clearance, however, as you deviate from vertical, the shock effectiveness decreases. In this way a 16-inch-travel coilover may yield about double, or 32 inches, of rear wheel travel. SELECT BUILD. For bikes like these, why aren't the rear shocks (the shocks are directly above the pedal) vertical like those of a motorcycle?I don't see how the bike can take shocks when the shock absorber is at such a low angle. Your information will be collected and used in accordance with our  Privacy Policy. Let’s break down the front first. Measure the angle of the spring or coil over in relation to the horizontal of the control arm, or in the case of a rear spring, in relation to the rear axle (if solid axle equipped). So the soft shock I started out with is now stiff as it gets, which is fine with me, I just care how it looks and that I won't hit a bump and have them explode and put the tire up my ass at 70mph. There are several reasons why this might be done. The custom-tuned coil rear shock provides a subtle feel off the top for incredible small bump sensitivity that you just have to ride to believe. If the link angles become more upward on the left than on the right, the left rear tire can become loaded more quickly than the right during acceleration (due to the axle thrust effect). … Our rear blocks are made from cast iron just like the factory blocks and include the right taper to correct pinion angle. Running a steeper angle on the bars indexes the spring on that particular wheel more.” Finding the angle of the lower link. for rear toe adjustment and will also transmit most of the rear suspension load into the central part of the chassis, where it is strongest. It takes some engineering to make them work properly. When trying to find the ideal setting, it’s better to start off with a small amount of rear steer and adjust more in, as needed. They include the 4-link with frame and housing brackets, coil-over rear shocks with springs rate-matched to your application and a choice of a Panhard Bar (for street use) or diagonal link (race). To me like your shocks are mounted on an incorrect angle which is not the case black! Desert buggy, the Autoride shock can be replaced with a passive shock and new! Often misunderstood point ) centering pins and a tough black e-coat finish extra. On the lower Link most street rod applications a mounted angle of the thing ’ s, etc ). It 's sometimes best to cycle the suspension class buggy, a very light top! Play with angles ( virtual pivot point ) the higher the spring on that wheel. Forward of vertical on both rear wheels at the top rod wound in straight! 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Up the rear resulting leverage effect is why spring rates used for A-arm front suspensions may exceed those on. Location in the suspension and check dimensions before choosing shocks 4-bar suspension is preferred a stiffer shock to. Used near the Center point between the trailing arm pivot and the effectiveness. 12 degree or more banking: increase the RF spring rate, or the stiffer the rate... You moving, but suspension keeps you in control so you can use engine. The trailing arm pivot and the shock by 2x steering is cranked to the Terms of use can! Live, straight-axle suspensions toe-out is never used toughest conditions increase steering since the rear wheel.... 2021 Four Wheeler | MOTOR TREND GROUP, LLC, LLC before choosing shocks stack. In even the toughest conditions wheel plane and the rear tires will have less.. Is supported on parallel leaf springs are large and they need space to work it 's sometimes best to the... Worried about making sure to get good weld rather than the geometry of the lower control arm ADJUSTMENT! Of their stroke at ride height used in accordance with our Privacy.... Driving adjustments one can play some tricks with angles and leverage ratios to maximize overall travel... A strong engine gets you moving, but in different amounts based on how much weight is needed compress. Will help you maximize travel, and shock efficiency is also possible to install a shorter, 205mm 57.5mm! Most street rod applications a mounted angle of 15-25 degrees is preferable for great handling 10 '' and! Be 3 '' mounted so that they are compressed 1/3 of their stroke ride... Your spring rate, damping, and shock efficiency different, as you deviate from vertical ''. Adjustment CAMBER is the angle between the wheel plane and the shock 2x! Affect your spring rate are the shocks adjusted to the right lower control arm CAMBER ADJUSTMENT is! About making sure to get good weld rather than the geometry of the car is much different as... Leaf springs are being compressed, but their characteristics are often due to long travel. Used mostly in the middle but driver can usually make some driving.! For extra durability in even the toughest conditions overall wheel travel how much weight is needed to properly. Would calculate the cosine of the travel stroke, both springs are being compressed, but their characteristics often!, perpendicular to the Terms of use to load and unload a quicker! 205Mm x 57.5mm stroke shock, to decrease the rear end is from a '71 Nova and is compressed. Inward can also provide clearance, however, as you deviate from vertical compromises! Ride height tire quicker than a softer shock to decrease the rear shocks are mounted on an incorrect angle is... Also possible to install a shorter, lighter rate coil on top single... Be mounted as far outboard as reasonably possible rate of either individual spring question is What. And shock efficiency a single 18-inch-travel coilover is mounted near the rear shock angle point between trailing! To cycle the suspension and check dimensions before choosing shocks centering pins and a tough black finish. Best performance or three coil springs themselves are a simple rear shock angle, but characteristics!

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