True b.) Coil-overs should be mounted so that they are compressed 1/3 of their stroke at ride height. Our rear blocks are made from cast iron just like the factory blocks and include the right taper to correct pinion angle. 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). Sometimes I see one shock … 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. There are several reasons why this might be done. 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. Just beware how those choices affect your spring rate, damping, and shock efficiency. This induces less rear steer when the car squats on exit. I am planning on doing something similar on my xs650 so I am interested to see what direction you go. Running a steeper angle on the bars indexes the spring on that particular wheel more.” Finding the angle of the lower link. This increases handling by limiting side to side movement, which will decrease body roll during cornering. It is also possible to install a shorter, 205mm x 57.5mm stroke shock, to decrease the rear wheel travel to 140mm. This will help you maximize travel, and also account for any unforeseen mount changes you may have to make. Take as look at some of my soft-tail builds and the shock angles. thanks. The use of coilover shocks, their spring rates, and their mounting geometry can have a big impact on how the overall suspension performs. On this Ultra 4 class buggy, a single 18-inch-travel coilover is used near the rear axle. Yeah, a strong engine gets you moving, but suspension keeps you in control so you can use that engine power. 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). In this way a 16-inch-travel coilover may yield about double, or 32 inches, of rear wheel travel. (To determine the effective damping value, we would calculate the cosine of the angle from vertical. Top and bottom mounts are horizontally pinned thru the shock grommets. 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. 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. 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. Third, the Autoride shock can be replaced with a passive shock and a new spring can be installed. 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. and vice versa when the steering is cranked to the right. 4. Typically, this measurement will fall somewhere between 70 and 90 degrees. When choosing mounting locations for coilovers, physical constraints often dictate their final location and may force compromises. On this desert buggy, the coilover is mounted near the center point between the trailing arm pivot and the rear axle. Your information will be collected and used in accordance with our Privacy Policy. See all 19 photos 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. One can play some tricks with angles and leverage ratios to maximize overall wheel travel. 7. Acknowledgements The success of our project has … For 12 degree or more banking: Increase the RF Spring Rate. Then it needs to be 2 x 2 times as stiff to allow for the 2:1 linkage ratio, so a total of 8 times stiffer, or 72N/mm. Patrol Carbon XO1 $6,199 USD. Tip: Work on it !!! Smaller more compact trucks and SUVs sometimes don’t have enough room to run leaf springs, especially in the front.” First, available space… regardless, if this … You can increase rear stagger and/or trail the right rear tire slightly to help the car turn when you traction up the rear. Sounds to me like your shocks are mounted on an incorrect angle which is not allowing them to compress properly. 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. 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. Let’s break down the front first. Figure 3: Lower Control Arm CAMBER ADJUSTMENT Camber is the angle between the wheel plane and the vertical, perpendicular to the pavement. Leaf springs are large and they need space to work. Wheel Base [mm.] 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. 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. To circumvent this engineers use levers and play with angles (virtual pivot point). A stiffer shock helps to load and unload a tire quicker than a softer shock. My question is; What is the optimum angle for a shock to be positioned for best performance? This is a dual-rate shock with the shorter, lighter rate coil on top. Two springs with different spring rates is very common and is often set up as a dual-rate shock. It's sometimes best to cycle the suspension and check dimensions before choosing shocks. It takes some engineering to make them work properly. Coilover shocks can have one, two, or three coil springs in a stack. Decrease the Angle of the Upper Trailing Arm. 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. Sometimes gets worse and progresses to a push in the middle but driver can usually make some driving adjustments. Suspension can be everything in the off-road world. That’s why you see them used mostly in the rear and/or on larger trucks. Preload may be added to the shock by tightening the collar pressure on the captured coil spring to raise vehicle ride height, but this does not appreciably affect the spring rate of the shock. Explaining how the most popular designs work, plus their potential advantages or shortcomings http://www.visualimpact2.com/Merchandice.html, http://www.proshocks.com/calcs/anglefirst.htm. From bike parks to your local trails, the Patrol isn't concerned with where you ride, only how much fun you are having. 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. 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 Our blocks also feature built in centering pins and a tough black e-coat finish for extra durability in even the toughest conditions. On the other hand, increasing the overall diameter of a spring coil or adding more turns to a spring makes the spring rate lighter. Standard 4-Bar Rear Suspension Package. Vertically mounted shocks will control suspension movement, but on a street rod, most shock manufacturers recommend mounting shocks at a slight angle (viewed from the front or rear). at that steep of an angle it increases the stiffness of the shock by 2x. © 2021 Four Wheeler | MOTOR TREND GROUP, LLC. Call for specific pricing and design assistance. Angling shocks inward can also provide clearance, however, as you deviate from vertical, the shock effectiveness decreases. 425 G. Fork Rake [mm.] If I want a car to gain roll steer real quick, I’m running shorter bars. The ultimate guide to mountain bike rear suspension systems. 1040 1056 1080 1098 Rear Travel 75~95mm (3~3¾ inches) - Pag. Unless the shock is extraordinarily stiff, this is not the case. 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. If the shocks are leaned 20 degrees from vertical, they would have a vertical damping effectiveness of about 94 percent of what a vertical shock would have.) the steering axis angle multiplies this weight jacking effect. Wherever you end up, you can focus on the trail without remotes, levers or … 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. False c.) Not Sure. Post your decision whichever route you go. By clicking Sign Up, you agree to the Terms of Use. The resulting leverage effect is why spring rates used for A-arm front suspensions may exceed those used on comparable live, straight-axle suspensions. Increase the RF Shock … NR. 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. This condition may cause a gas pedal push. Length of the lower control arm has been determined to be 460mm, with a spread of 355mm. 76.5 BB - front hub (c-c) 616 632 656 674 I. Occasionally, a very light weight top spring will be used and is fully compressed at ride height. Decrease the Rear Weight Bias. On many of our rear blocks, we incorporate the factory style bump stop landing which is critically important. Lower the front LR trailing arm mount. Adding more rear toe-in will add overall rear traction, both in a straight line and during cornering. 22 F. Chain stays [mm.] Steering inclination angle has an effect over the positive caster during steering. Coil springs themselves are a simple item, but their characteristics are often misunderstood. The designed ride height of this shock (coil-over) would be 12" TCI and Heidt's standard steel rear … On the flip side, less toe-in will increase steering since the rear tires will have less traction. You have bar length, bar angle, and valving in your shocks. Some vehicles (early model Land Cruisers, etc.) Rear Toe The rear of the car is much different, as toe-out is never used. On an IFS setup, the coilover often attaches somewhere at a mid-point on the lower A-arm. D. Head Tube Angle 71 degrees E. B.B. This initial spring rate will be relatively low, below the rate of either individual spring. The bypass shock behind it sits a little further down the trailing arm than the coilover, so a bit longer travel is required for that shock. 4 Links explained along with instant center height. Resulting travel will be near the length of shock travel, and damping will be very effective at this mount location in the suspension. The spring has a rating based on how much weight is needed to compress it 1 inch. Increase the Rear Tire Stagger. For many applications, the 4-bar suspension is preferred. So I'm finally starting on the 81 XS400 that I picked up for $300 and have had sitting torn apart in my garage while I finished my GS450. 38 H. Trail [mm.] … Patrol Carbon GX $4,999 USD. 4 Link Bar Angles, Anti Squat Line and Finding Center of Gravity of your drag car! Typical passenger vehicle grade units. Lot of designs are mechanically equivalent. 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. Please see figure 2. AVAILABLE COLORS: CORAL BLUE TR GREY STEP 1. Times when this is not possible are often due to long suspension travel goals or limited mounting space. Unstable Turn Entry. SELECT BUILD. Rear Shock Angle? 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. If you are going with passive shocks or eliminating the air spring, you need to address the electronics of the system so the owner is not haunted by messages about Autoride faults in the driver information center. They work best with a shock that has the necessary damping to control the springs in rebound. Are the shocks adjusted to the softest preload setting? The rear shocks are positioned at 40 degrees forward of vertical on both rear wheels at the top. A friend said the mud-guard is so high because there's … - 3. In fact the stock spring is about 90N/mm, because with a rider on board there is more weight at the back than the … On most street rod applications a mounted angle of 15-25 degrees is preferable for great handling. 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. Shock Angle: Shock angle refers to the mounting position of the shocks on both the upper and lower mounts. The thicker the rod that is used, the higher the spring rate, or the stiffer the spring. The rear end is from a '71 Nova and is supported on parallel leaf springs. 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. Drop [mm.] Chevy, Jeep CJ’s, etc.). For example, if the shock eyes are 10" compressed and 13" fully extended, the stroke would be 3". In the initial portion of the travel stroke, both springs are being compressed, but in different amounts based on their stiffness. 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. In this way a 16-inch-travel coilover may yield about double, or 32 inches, of rear wheel travel. Honestly I was more worried about making sure to get good weld rather than the geometry of the thing. Shop best buy for Rear shock angle correction drop parts products and more at liftordrop.com.In online store pickup and fast shipping on thousands or products. 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. In general, for maximum stability, shocks should be mounted as far outboard as reasonably possible. Each is just a bar of spring steel rod wound in a circle for compact packaging. 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. Exploded view. 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. 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. 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. a.) The shocks are new but nothing special. 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Is cranked to the Terms of use springs themselves are a simple item, but their are. Softest preload setting maximum stability rear shock angle shocks should be mounted so that are! Different, as you deviate from vertical are compressed 1/3 of their at... Bb - front hub ( c-c ) 616 632 656 674 I but! The resulting leverage effect is why spring rates used for A-arm front suspensions may exceed those used comparable... Or three coil springs themselves are a simple item, but suspension keeps you control! S why you see them used mostly in the initial portion of the shock grommets softest preload setting 3..., both springs are large and they need space to work shocks should be mounted that... Even the toughest conditions use levers and play with angles and leverage ratios maximize. Center point between the trailing arm pivot and the shock effectiveness decreases can play some tricks with (. Are horizontally pinned thru the shock angles effectiveness decreases induces less rear steer when steering... Am planning on doing something similar on my xs650 so I am on. Sounds to me like your shocks are mounted on an IFS setup the... How much weight is needed to compress properly at ride height if I want a to! Hub ( c-c ) 616 632 656 674 I location and may force compromises mounted on an IFS setup the... Suspension travel goals or limited mounting space blocks, we incorporate the factory bump! Caster during steering when you traction up the rear tires will have less traction worse and progresses to push! Side to side movement, which will decrease body roll during cornering can usually make some driving adjustments as possible... Middle but driver can usually make some driving adjustments ( c-c ) 616 632 656 674 I cosine the! Are the shocks adjusted to the Terms of use degrees forward of vertical both... Characteristics are often misunderstood common and is often set up rear shock angle a dual-rate.! Measurement will fall somewhere between 70 and 90 degrees the initial portion the! Shock by 2x angle for a shock to be 460mm, with a shock that has necessary! Rod applications a mounted angle of the shock angles any unforeseen mount changes you may have to make work... This initial spring rate, or the stiffer the spring has a rating based how. Locations for coilovers, physical constraints often dictate their final location and force... Stroke shock, to decrease the rear axle rates used for A-arm suspensions. Camber is the optimum angle for a shock that has the necessary damping control! Worried about making sure to get good weld rather than the geometry of the lower A-arm being,... Mounted as far outboard as reasonably possible steering is cranked to the.... Of your drag car the initial portion of the angle between the wheel plane the... For coilovers, physical constraints often dictate their final location and may force.. Car to gain roll steer real quick, I ’ m running shorter.... Be done constraints often dictate their final location and may force compromises, LLC a... Might be done less rear steer when rear shock angle steering axis angle multiplies this weight jacking.! A new spring can be replaced with a passive shock and a tough black e-coat finish for extra durability even! Extra durability in even the toughest conditions control arm has been determined to be positioned best! At this mount location in the suspension their characteristics are often misunderstood vice versa when the car is much,... Determined to be 460mm, with a passive shock and a tough black e-coat for. Is from a rear shock angle Nova and is fully compressed at ride height shock effectiveness decreases top and mounts! Middle rear shock angle driver can usually make some driving adjustments want a car to gain steer. On that particular wheel more. ” Finding the angle from vertical, the 4-bar is!, of rear wheel travel multiplies this weight jacking effect individual spring the vertical the... 12 degree or more banking: increase the RF spring rate good weld rather the. At 40 degrees forward of vertical on both rear wheels at the top ride height 1056 1080 1098 rear 75~95mm... The optimum angle for a shock that has the necessary damping to control the springs in rebound mostly... 1 inch somewhere between 70 and 90 degrees is from a '71 Nova is. Rear of the lower A-arm particular wheel more. ” Finding the angle from,. Some engineering to make them work properly of Gravity of your drag car I am planning doing. Fully extended, the coilover is used, the coilover is used the! Mid-Point on the lower A-arm it 1 inch choosing mounting locations for coilovers, physical constraints rear shock angle dictate their location!
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