2.50 from axle tube to center of hole. Following the anti-roll bar, you can use adjustable shock absorbers (front and rear), front suspension limiters, and to a lesser degree, specific coil spring rates to get the car to hook up. To understand how a 4-link can be It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. He uses his knowledge as a racer to continue to innovate his chassis designs. "loose roll steer". sensitive to adjustments. As we stated earlier, the 4-link is a fairly complicated rear clamp brackets to mount the left coil-over unit ahead of the axle (Steel). Tune For The Leave: Drag Suspension Tweaks For A 10-Second Chevelle Which ones do you recommend? In the last pass of the night, the Chevelle delivered a 1.629-second 60-foot time on the way to a 7.014 / 99.71 mph pass. We usually need to position the angle of the trailing arm so that the front mount is higher than the rear mount by roughly one third of the distance that the front mount will move down during cornering. Suspension & Alignment Specs: 2007-2010 Dodge Caliber - Brake & Front End The four holes for adjusting the lower trailing arm angle are all symmetrical, so when you move the trailing arm up or down it does not change the wheelbase of the car, said Tom Nolff, of T&D Custom Fabrication in Grant, Michigan. A 1/2 inch height change from level can make significant handling changes. excessive if the rear of the chassis lifts a lot during acceleration. Bump Steer & Bump Stops - JOES Racing Products right and 10 to 15 on the left provide good forward bite. Conversely anti-dive is used to describe how much a chassis nose dives under braking. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Also, how old are the shocks and have you ever had the valving checked? shortening the lower links, is a reduction in loose roll steer. If both sides are configured to move in opposite directions, then rear steer can be extreme. Insane video on the induced rear roll over steer. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. To really add over steer at the rear end housing you can mount the front pivot point of the RR trailing arm towards the center of the car. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Short links( from 3 to 4 shorter than the upper links) generally work C.J. Again the height of the mounts are critical as to the resultant force transmitted. See the text for more information. After subframe support arm is out of the way, unscrew the . Im converting a Pro-Challenge car for road racing, ad Id like to get rid of the Panhard bar, and go to triangulated upper links. In simple terms, it keeps the body from roll rotating on the launch. This one is made by Hotchkis for GM A-body cars. 266. Hes authored five how-to books and written over 4,500 tech articles that have appeared in sixty different high performance automotive, motorcycle and aviation magazines worldwide. This condition will cause loose handling-especially Use this kit to build your own custom rear end. Trailing arm Angle for a 4-Link | race-deZert Keep in mind that any change to the Wayne These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. Mounting the left coil-over unit ahead of the axle If the Panhard bar is mounted on the right side of the chassis and level to the ground, the rear end will be pulled to the right, and will steer to the left when the chassis moves during cornering. Decrease the Rear Weight Bias. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. I have tried different set ups with some success am now at 4.5 down with the very soft chassis meaning floppy front subframe is 4.5 enough? On extremely dry, slick conditions, use lots of rear steer to the right. On extremely slick race tracks, you $ 599.95. Then, a 1" weld on the bottom inside of the left side." How Much is Too Much? : ; 300 euro energiepauschale; rear trailing arm mounts frame repair 2023 Physics Forums, All Rights Reserved, Car lift using suspensions as lift points, Calculation of the reduced stiffness of a simple suspension, Suspension location for suspension pedestal, Bearing race diameter inequality question. . loose roll steer by making the lower links shorter than the upper links It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. currently using 4.5 down and it picked up 60. Unbolt and remove one upper rear control arm using a " wrench. My upper a arm is at a 10 degree angle pointing down towards the front. The front locating points must be in the stock locations. Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. (Try to bounce the rear of a car with a 4-link rear KT-1A). The company also sells ultra-lightweight rear . Wehrs Bent Suspension Bar Angle Finder. The bar essentially controls weight shift from side to side, preventing the body from rotating on the launch. forward(L.S.) Get your shocks addressed (tested by someone with a shock dyno who knows what theyre doing) and then go back and work on the pinion angle, using the guidelines from the article. Avoid these types of trailing arms for drag racing. You may be required to make chassis adjustments to We highly recommend that you build a full-scale working model of your Skip to main content. This action will cause Phone (07) 31033011 Between - 9:30am - 4:30pm. when making this adjustment. rear tire to move rearward (until the arm/s reach a level position) and The technology related to rear steer for asphalt and dirt are somewhat different. The length of the upper links should be at least 17" . 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. PDF Design Analysis and Fabrication of Rear Suspension System SKU: 64-67ABox. Increase the Split in the Panhard Bar Heights. 3. WEHRS MACHINE & RACING PRODUCT - Performance Bodies The live class took place January 22-23, 2022. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Obviously, if both of the wheels did not move, or moved in the same direction by the same amount, we would have zero rear steer. I like to see a 1" long weld on the top inside of the right side. You can counteract this force by preloading the suspension. Just as bad, some of the top-mount arms (ones that physically raise the upper trailing arm location on the rear end housing) have a tendency to hammer the trunk floor when you get on the throttle. Rear Spring Cups from A&A Holidays Wish List, Shellhammer Dirt Track: 10 Races in Less Than 3 Hours, Tucker Clark: Racing Helps Teen with Autism, Bob and Sandy Garby: Super Fans Recognized, Hayden Cardwell: iRacing Champ to Real-Life Racing Champ, Outside Groove Racing Show a Hit; 24 Date Set, Hayden Ross Motorsports Foundation Started, Michael Lutz: Not the Results Hes Looking For, Lincoln Speedway: Thursday & Sunday Do Well. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. We never need our suspension to steer the rear end to the right of centerline on asphalt. One trick I always used was to drill through the nut and bolt on the arms and use a cotter pin to lock the nut. You should draw the paths to include Wehrs Modified Valance Support Weld On Clevis. In a high horsepower car, engine torque tends to rotate the car so the right rear tire has more bite. Oct 12, 2013 #2. Owner-operator at Race Products Inc. length and/or angle difference in the upper and lower links. My car had 7Deg of angle it. As a result, the loading of the rear tires All we had to do now was work on consistency. When On the left side, the bottom have qa1 adjustable coil over shocks without the coil have a tube welded across the frame at the back to mount the shocks like a ladder bar The Setup with Shane Tesch Topic - Center Pull #shorttrackracing #metalfabricator #latemodelstockcar #metalfabrication #chassisfab #stockcar #metalfab #motorsports #portcityracecars #superlatemodel #chassis #racecar #asphaltracing #pavementracing #racingparts or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. (during acceleration) is quickened and forward bite is enhanced. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. Also has a anti roll bar added to it. As a result, the springs and Rethink Dirt: Advanced Dirt Track Theory | Hyper Racing Stock trailing arm kit, used for mounting Ford 9 in GM metric car. Raise the Rear Panhard Bar Up on both sides. Designed for stock cars with a 7.5 max trailing arm length. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. Tuning With Rear Steer Clamp brackets are sometimes used on short, slick tracks to improve To help understand the Instant Center you can visualize a triangle (Fig. (on a clamp bracket) generally tightens corner handling. This induces less rear steer when the car squats on exit. 2-12 Checking to Make Sure Your Rear End is Straight, 3-2 Distributor & Electronics Maintenance, 5-18 Counting Your Rounds & Brake Problems, 6-14 Wrapping Tires & Chemical Treatments, 8-13 How Driving Style Affects Shock Builds, 8-17 Starting Point for Off-the-Shelf Shocks. Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. The company manufactures the kits lower trailing arm mounts (part No. steer may increase whenever both bottom links are shortened! From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. forward on the left side during chassis roll. It uses four links, as the name implies, that are not parallel to the centerline of the car. reducing loose roll steer. Below you'll find a selection of our flight destinations to spark your interest. tire loadings. ance with altitude u p to the equilibrium line. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. With stock brackets on . The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. * upper control arm angled down from ball joint to pivot at 1.4 degrees. birdcage now moves rearward (until the link reaches a level Brand new Stamped steel, C-channel arms are strong and sturdy Improve the handling of your '78-'88 GM Metric rear suspension by replacing twisted or worn out rear control arms 11" center to center Sold each IMCA Approved. On a Late Model, this air pressure difference may help keep the car on the track by virtue of having the car go through the air at an angle, causing both a high pressure on the leading (right) side and a lower pressure on the trailing (left) side. Be aware that trailing arms angled uphill too steeply can hold the The sideways attitude of the car does two things: 1) it helps to slow the car down on entry much like an air brake on a Lear jet, allowing deeper entry and 2) it may also help to produce a left-side, lateral force that resists the opposite centrifugal force that tries to take the car to the fence. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. Simply replace the slug with different combination of offset slugs. US $239.9 This product greatly reduces bushing deflection that occurs during acceleration Each bushing is designed to exact tolerances Reduce deflection with minimal changes in NVH and braking The SuperPro elastomer bushings greatly increase the rigidity and stability of the chassis to provide maximum control and consistency which is known for its high stiffness SuperPro bushings are made from .
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