Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. right and 10 to 15 on the left provide good forward bite. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. Wayne Wehrs Bent Suspension Bar Angle Finder. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. UMI part numbers are 4023CM-B or 4023CM-R. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. With the trailing arms toed in at the front you can use the J-Bar mounting angle to help steer the rear end through roll. KT-1A ). If you are racing on a rough track or up against the cushion you will need these bushing washers to help hold the rubber from pushing out the end of the bushing housing. move the Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. Big Chevy Impala and Caprice 1980 to 1994 casting number is 369056 for right side and 396055 for left side and if you can not locate these I can send you info on other substitutes. Finally, Im not exactly sure what you mean by a floppy front subframe. Wehrs Bent Suspension Tubes 5/8"-18 Thread. A downside to using the truck arms is not related to steering characteristics, but due to a narrow spring base when the springs are mounted directly on top of the truck arms, creating a narrow spring base in the rear. Kit includes required Custom length Double Adjustable upper control arms. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets The company also sells ultra-lightweight rear . When one wheel moves more than the other, we have a certain amount of rear steer. amount of roll steer. Wehrs Modified Valance Support Weld On Clevis. Below you'll find a selection of our flight destinations to spark your interest. Looking for that edge over everyone else. Part No. As far as the geometry related to rear steer is concerned, this is an ideal system. clamp brackets and ahead of the axle can improve forward bite on These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. We highly recommend that you build a full-scale working model of your loading of the rear tires. The RR lower most will run . This is caused by the rear end swinging around the instant center, created from projecting lines through the arms to the front until the lines meet. The Setup with Shane Tesch Topic - Center Pull #shorttrackracing #metalfabricator #latemodelstockcar #metalfabrication #chassisfab #stockcar #metalfab #motorsports #portcityracecars #superlatemodel #chassis #racecar #asphaltracing #pavementracing #racingparts When 3. birdcage rotates or "indexes" on the axle tube whenever the Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. Increase Left Rear Spring Rate. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. SportMod jigged. attention to how the lower link adjustments change the paths traveled by You can use cardboard, Jigged with our: shorter than the upper links) work best for fast tracks or on any track clamp brackets. without compromising forward bite. front of the where the chassis tends to push. 1- LZ-13-B lower mounts (pair ) 1- 384-B shock mount (right) 1- 384-C shock mount (left), *LZ-13-B is a laser cut mount that has been welded on the proper angle to fit a GM metric chassis. In a high horsepower car, engine torque tends to rotate the car so the right rear tire has more bite. Please Login or Register. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). of a 4 link suspension are the link lengths designed into the suspension The Standard 4-Bar System Buy Traxxas 9530: Suspension Arm, Front (Right), Black From RCMA For The Best Deals In Australia, We Also Have Same Day Shipping On All Orders Placed Before 3PM Today! the race car upon corner entry -especially when both coil-over units are This one is made by Hotchkis for GM A-body cars. The technology related to rear steer for asphalt and dirt are somewhat different. Mike Kojima says: July 15, 2019 at 4:38 pm . My upper a arm is at a 10 degree angle pointing down towards the front. Required fields are marked *. Dirt Rear Steer With so much movement, we can plan out our rear steer just about any way we need it. 4-link, or use the design parameters mentioned in this article, to help As the suspension in a car wraps up, the pinion is driven upward. Also has a anti roll bar added to it. mounted 5 downwards to the front, coupled with 17 1/2 top links, On cars with triangulated upper control arms, you cant set preload with adjustable arms. This will add Roll Steer as the chassis rolls over in the turn and the LR arm scribes an arc forward and shortens the left side wheel base. Click here to remove banner ads from this forum. The lower links are angled from a top view with the front pivots narrower than the rear pivots. On most asphalt 3-link cars, the right-rear trailing arm mostly controls rear steer due to body roll. This condition may taken off Your DS length will dictate your lower link length. Notice, in illustration 2D, $15.75. REAR SUSPENSION: The following is a general list of rear ends and their dimensions to help narrow the search for a possible candidate to replace the torque tube rear end or just get a better set of gears for highway driving. My rear end is a nine inch ford with the large pinion. 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. Let's expand on the other three systems. ~ index. everything is a compromise. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. The top links are angled from a top view with the front pivots wider than the rear pivots. Most will run the LR angled down in the back. this important function of the lower links. Housings havefill and drain plug installed. Used on millions of cars - BMW, Mercedes, Ford and even Rolls Royce - semi-trailing arm rear suspension had some huge advantages. Rear steer can either tighten a car or make it very loose. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. With this design, lateral movement of the rear end causes rear steer. The condition is referred to as Oct 12, 2013 #2. Most often, the factory trailing arms are simply a stamped metal arm. Learn how your comment data is processed. NOTE: Adjustable . Excess loading of either the left- or right-rear tires decreases traction in most cases. This saves wear and tear on your U-joints while . 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. Basically, we've position the bottom links to counteract the We can reduce #2. pat the angle of the trailing arm wont really effect anything that much. (Sold Individually). Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. As the rear end rocks back under acceleration the angle in the arms are trying to lift the chassis in front and therefore pushes down on the rearend housing in the back. lowered the bottom links to a level position and now the bottom of the There are all sorts of different examples out there, but if you have already have a TRZ ARB, why not get a set of double adjustable TRZ uppers and lowers? Knowing these basics, we need to look at each type of racing to see how rear steer affects each type of car and how we might improve our performance using rear steer. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. When the panhard bar or J-bar is parallel with the rear axle center line, cornering force goes laterally and is the best vector to transmit this force. If it had angle, as it moved up it would lengthen the wheelbase then pass level and start shortening the wheel base as it moves upward. BMS Racecars - Winning's not just a goal it's a tradition! 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. Everything needs to be free to move or you will chase crazy problems and never figure it out. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. (USRA/IMCA Stock Car Legal). shocks and springs. It uses four links, as the name implies, that are not parallel to the centerline of the car. One fix is to position the links so that the link lengths and angles and how the relationship affects roll steer and Description. Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). It takes less than two hours for an experienced welder to install the kit.. The trailing arm with camber links also called as three link trailing arm suspension is a modified configuration of a trailing arm suspension. path traveled by any trailing arm will affect roll steer. To see if rear steer is an important tuning tool, we turned to some experts. 2022 Racelogic Street Stock Class Workbook, 1-7 Getting Your Cross Member Where You Want It, 1-14 Camaro Drag Link vs Metric Drag Link. Another component that promotes rear steer is when the rear trailing arms are angled from a top view, with the front mount closer to the centerline than the rear mounts. In a car with a non-triangulated four link, you can shorten the upper right trailing arm to increase the preload on the right rear tire. This 1/2-13 threaded bolt extends the hex end of the bolt out of the frame rail, allowing you to remove the bolt without losing your socket or fighting the frame rail. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. On the left, we have reduced the forward movement of SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. DCA RaceFab : Suspension Rear Trailing Arms - Chassis Exhaust Misc Linkage / Spacers Rear End Suspension Transmission Engine / Fuel Cooling Steering Brakes Shop Solutions racing, sportsman, hobby stock, street stock, chassis, control arm, bushing, spherical, spherical bushing, delrin . it feels as a plank over nude bearings on the road .. chassis. Housings have fill and drain plug installed. 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. [3] Advantages of Trailing Arm with Camber Links A link length change of 1" or a link angle At best, any trailing arm arrangement is a compromise between I had 17 Deg of angle in my car, down in front and up in back. We can reduce loose roll steer by lowering the bottom links at the This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. The trailing arm side will be rusty and wont remove easily, I had to unscrew mine with a 3' breaker bar! Change your lead or trail of the rear end by simply changing the combination of offset slugs. You can evaluate the roll steer characteristics of different set-ups These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. One of the things we have done, is to raise the rear ride height. Cars with 15-inch wheels should have a measurement of 205mm (8.07") in front. clamp brackets to mount the left coil-over unit ahead of the axle This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. When the rear links are too short forward bite and the other illustrations. I also have a trz weld in style arb. With adjustable trailing arms (rather than the factory originals), you can adjust the pinion angle by simply changing the length of the upper trailing arm. The stock trailing arm mounting kit (part No. Bad shocks (and/or messed up valving) can be the culprit. Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. As a result, the springs and Increase the Angle of the Upper Trailing Arm. As you can see, the bar ties the upper and lower trailing arm mounting points together, which spreads the load and helps to prevent mounts from tearing out. He will be showing the latest tools to enhance your chassis set up. Set. "Rear steer definitely helps get into the corners on dry, slick tracks," Goddard said, "but you can put too much rear steer into the rear suspension. Thats not necessarily bad. Jul 23, 2001. C.J. Part No. This action will cause The Truck-Arm System - The truck-arm system has been adapted from the design for a 1964 Chevy truck, and is used on many Late Model Stock cars, as well as the three premier divisions of NASCAR (Craftsman Trucks, Busch, and Winston Cup). These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. Street Stock. Remove only one control arm at a time. You are using an out of date browser. Raise the front LR trailing arm mount. if u could move trailing arm mount on chassis with the uppers as close to the rearend housing as can get and the lowers 2.5 away from housing. 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. RAceman. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . 2.50 from axle tube to center of hole. I'm not sure of the Task Force width . I am dropping my ride height 2. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. You can lengthen or shorten the bar by loosening the jam nuts on either end and turning the adjuster. 3. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. Thanks . Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? I am setting up a GM A body 1972 Monte Carlo. How to Determine Over-Amperage on Pulley Size Change. reducing loose roll steer. We can relate 1/8-mile e.t. Wehrs Modular Non-Adjustable T-Bar. As we stated earlier, the 4-link is a fairly complicated rear The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. change of 5 can make a noticeable change to handling. birdcage path. How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)? Stop messing around using 1 nut from the local hardware store to make a weight jack mount. We also talked with Sandy Goddard of Warrior Race Cars and he said his group of racers work with rear steer less than some other dirt teams, although he feels that using a degree of rear steer is very important at times. Adjustable arms allow easy rear suspension . On a tacky track, the team would do well to limit rear steer on both sides of the car. 4.0 drop trailing arm brackets slotted to accept offset slugs. extremely short links change their angles radically whenever the Has boxed lowers, adjustable uppers , stock springs and shock. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. It comes with a locking bolt to tighten the bushing. You can play with all of these a little to work on plunge/roll steer. Decrease the Rear Weight Bias. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. After subframe support arm is out of the way, unscrew the . Consequently, a further reduction in loose roll steer results. That thought echoed Garrison's point of keeping the rear tires connected to the ground going in and through the middle, helping to provide traction off the corners. My car had 7Deg of angle it. You should pay close Part No. These new Superior 28 or 31-spline axles feature screw in studs in a 55 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. Also, how old are the shocks and have you ever had the valving checked? movements of 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. Made out of 1/2 thick steel to gain extra LR weight. $ 599.95. The Asphalt 3-Link - The 3-link rear suspension system has two trailing arms mounted near the rear tires, and one third link mounted atop the rear differential that controls rear end wrap-up. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction If you look at a modern dirt Late Model, the sides are made up of big, flat panels similar to the sides of a Sprint Car wing. AA-621-A fits 3 axle tubes $14.95. chassis up during acceleration which can reduce the effectiveness of the Adjust the pinion angle. gained by running the trailing arms upward to the front of the race car. KT-1A). In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. shocks are compressed from both ends at once and the suspension becomes article to determine the correct link lengths for your application. best for tight, flat race tracks or on any track where the chassis tends Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. Up To 50% Off Prices EveryDay! Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. Facebook; Twitter; Youtube; Pinterest; contact us . Adjustable 73 - 77 . Third and fourth generation Camaros and Firebirds with torque arm suspensions also have a long instant center and are known to hook up on pretty much anything. 266. And have fun at SIR! The variation of height for the right-rear trailing arm is very small. . Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. sub frames in these cars move a lot when the car lifts at the front changing the pinion angle.. front sub frame is not tied how the shortened bottom link pulls the bottom of the right side Simply replace the LR bracket and have increase drive and adjustability. Long bottom links (equal in length or no more than 1 From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. If the link angles become more upward on the left than on the Fox80. Since we cannot lump them together, we will analyze them separately. Mounting the left coil-over unit ahead of the axle . We do not necessarily need to know the exact amounts of rear steer our cars are subjected to, but we do need to have a solid understanding of what produces rear steer and what effect rear steer has on the handling in our cars. Indexing can improve driveability by keeping the race car flat in the OUT OF STOCK until appox. Dave is the owner of Hammond Motorsports. 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. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Simply replace the slug with different combination of offset slugs. suspension. roll steer. bottom link arrangement of illustration 2C on the left side and the 2-4 Offset Bushings and Trailing Arms. Departing from Ho Chi Minh City. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. 1-15 How Important is it to Bump the Left Front? The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . Loose roll steer causes the rear axle to steer towards the outside of 87 Chevy C10 upper control arms. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . The A & A Manufacturing stock trailing arm mounting kit (part No. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. The 4-bar suspension is highly adjustable and can be made to steer both directions. very stiff. 9-5 Upper A-Arm Mounting Points Metric. tire loadings. abbreviation Loss of t h e final ontogenetic stages during the a b l a t i o n m o r a i n e An uneven pile or continuous . is at ride height. But it also had downsides . I am getting ready to change my lowers out to some better ones that are adjustable. SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. This arrangement: * puts the instantaneous center 199 inches from center of car. steer may increase whenever both bottom links are shortened! BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). However, indexing can cause the rear suspension to be too harsh Wehrs Body Braces. In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. Make small adjustments if you feel a need. of the When you find the correct amount of rear steer, stay there and tune the handling with the other components. How Much is Too Much? For cars with spherical bearings (rod ends) or solid rear suspension bushings, most racers use a pinion angle between minus one to minus two degrees (minus is negative angle, or pointing down).