Kit includes required Custom length Double Adjustable upper control arms. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". suspension by angling the trailing arms upward toward the front of the The Z-link System A well designed 4-link provides good forward bite and the proper acceleration causes the rear axle & chassis to separate. Thanks. The A & A Manufacturing stock trailing arm mounting kit (part No. Lower the front LR trailing arm mount. When one wheel moves more than the other, we have a certain amount of rear steer. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. corners. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. Asphalt Rear Steer Rear steer in this system is caused by chassis movement, which can . Make small adjustments if you feel a need. These conditions call for a driving line that is more straight ahead. suspension). Tack weld the slugs to secure them to the trailing arm. A good Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. very stiff. Black & Red PCE 16A Coupler (400Volt, 3P+E Pin Configuration) 16A Lead Coupler with a current rating of 16, a voltage rating of 400 and a 3P+E pin CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. to be loose. This induces rear steer when the car squats on exit. Bad shocks (and/or messed up valving) can be the culprit. $64.00. We can relate 1/8-mile e.t. Increase Left Rear Spring Rate. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. Another method used to reduce the loose roll steer of a 4-link 2- 175-C bushing for upper mounts. When selecting springs for your 4-link, you should AA-175-D. LR bracket is 6.75 from axle tube to center of bottom hole. clamp brackets (since there's no longer any indexing of the Finally, Im not exactly sure what you mean by a floppy front subframe. This was encouraging. In short Facebook; Twitter; Youtube; Pinterest; contact us . Set. Trailing arms must also be running forward at the correct car builder design angle. His company has experimented with dirt track aero in the past. At best, any trailing arm arrangement is a compromise between Departing from Ho Chi Minh City. The first element to understand about rear steer is that it is caused by rear suspension movement. 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 . And have fun at SIR! These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Wehrs Bent Suspension Bar Angle Finder. Excess loading of either the left- or right-rear tires decreases traction in most cases. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). This action will cause The company also sells ultra-lightweight rear . Learn how your comment data is processed. 88 metric lower trailing arm $65.00. 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. See all 6 photos. July 1st. I am going to raise the car next to achieve ideal front lower control arm angle (still to low for that) then corner balance and tweak from there. Dirt Track Aero adjustment, positioning the lower links 5downhill, causes the bottom of With stock brackets on . two factors. about rear suspensions. (on a clamp bracket) generally tightens corner handling. 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. As a result, we reduced loose right side link is from 3 to 5 higher than the left when the chassis A rear end steered to the left of centerline will cause the thrust angle to be left of centerline and make the car tighter on entry and tighter on exit under acceleration. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. 2,224. Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. loose roll steer tendency caused by the steep angles of the upper links. The 4-link is a relatively complex rear suspension that is very When designing or The upper arms are angled to form the triangle that gives the suspension its name. suspension moves. How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)? coil-over units directly to the axle housing. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. Avoid these types of trailing arms for drag racing. 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. (Sold Individually). Description. 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. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. 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. On the left side, the bottom the right side Conversely anti-dive is used to describe how much a chassis nose dives under braking. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. The difference is that now we can maintain rear traction-having never broken loose-and the car is angled somewhat sideways, and pointed in the right direction to get off the corner. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. In Stock . the bottom links are lowered but the effect on forward bite is usually Also has a anti roll bar added to it. ance with altitude u p to the equilibrium line. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. 4. it feels as a plank over nude bearings on the road .. $15.75. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . Rayburn builds the swing-arm type of rear suspension. 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. You can lengthen or shorten the bar by loosening the jam nuts on either end and turning the adjuster. illustration 2B where the links are level. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. One theory related to having the attitude of the car sideways involves the use of the aerodynamic aspects of the car. Suspension movement usually increases when the coil-over units are or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension.This type of suspension has coil springs and upper and lower trailing arms (also called control arms).The upper arms are angled to form the triangle that gives the suspension its name. AA-175-B) are constructed from stout 5/8-thick steel. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. Under most current rules, there is no adjustment for amounts of rear steer with these systems. Insane video on the induced rear roll over steer. 266. The lower links are angled from a top view with the front pivots narrower than the rear pivots. Built with corrected pinion angle and our proven "Pull" Bushings. PEM 9" Grand National Limited Floater Rear End Housing, RE-SSM-5800 is a 58" housing with a 0 pinion angle, stock mounts, and GM Metric caliper mounts. on rough race tracks. 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 Part No. The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. The Metric four-link suspension design is a bit different than most other rear suspensions. Decrease the Angle of the Upper Trailing Arm. (Steel). These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. can tighten overall corner handling by using Truth!^^^^^. Any angle up hill to the right rear will cause upward force on both tires and unload both tires. Used on millions of cars - BMW, Mercedes, Ford and even Rolls Royce - semi-trailing arm rear suspension had some huge advantages. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. JavaScript is disabled. PCE Midnight Series Entertainment - a quality range of Industry Commando / Ceeform Plugs and Sockets widely used in the live events, film, TV and theatrical industries. birdcage forward during chassis roll more than the longer links in Anti-squat is a concept used to determine how much the rear of a chassis will squat under acceleration as a result of the rear geometry. rear tire to move rearward (until the arm/s reach a level position) and These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. clamp brackets to mount the left coil-over unit ahead of the axle Up To 50% Off Prices EveryDay! the indexing and the link angle changes during roll or bump. traction characteristics desired by the chassis tuner. 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. Compare the measurements to specifications. Upper link angles from 15 to 18 on the Those conditions rarely exist on dirt. Dartmouth, Nova Scotia. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. "We have always wanted rear steer," he said. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. Thanks . If excessive, loose roll steer can cause a loose Browse Suspension Parts, . 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. As far as the geometry related to rear steer is concerned, this is an ideal system. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). Skip to main content. My upper a arm is at a 10 degree angle pointing down towards the front. Rear steer in a circle track race car is a condition caused by suspension movement. Ground clearance at bump and uptravel at ride height will dictate link angle. You can see how this adjustment works in illustration 2B. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. A racer himself, he was the winner of the Street Stock Nationals in 2019. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. right amount of loose roll steer can help a race car to turn the corner The front locating points must be in the stock locations. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. The advantage of this system is that it keeps the rear end squared up and the thrust under acceleration straight ahead, if that is what is needed. To make it work, Id be inclined to either use spherical bearing upper and lower rear trailing (control) arms or at least a set with Delrin bushings. wenee9w Pit Crew. 1-15 How Important is it to Bump the Left Front? LZ-13-B) from 3/16-thick steel. How to Determine Over-Amperage on Pulley Size Change. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. When the track goes slick, especially dry slick, rear steer is needed. Decrease RR Trailing Arm length by 1/8 inch. Dave here in Saskatoon been racing a g body for many years now and struggle to get when making this adjustment. If you dont do anythinig else. am out of adjustment on the uppers so will be installing a set of adjustable lowers Wayne thanks for the input But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. right and 10 to 15 on the left provide good forward bite. Then, a 1" weld on the bottom inside of the left side." Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. 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. Then this trailing arm bracket kit is a must have. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. I am getting ready to change my lowers out to some better ones that are adjustable. The roll angles and vertical movement on a dirt car can be very pronounced. with the very soft chassis meaning floppy front subframe is 4.5 enough? coil-over units on Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. AA-175-C). We should learn to read the conditions of the dirt tracks and tune the amount of rear steer-less for tacky and wet conditions, with more rear steer as the track gets slicker. 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. Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. All driving train actually repalced with Moog components.. bottom link arrangement of illustration 2C on the left side and the 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. Custom Part is Non-Returnable and Non-Refundable. Now with Ten properly positioned holes . illustration 2A. Dirt Rear Steer MAXIMUM Performance right side climbing panhard mount for quick change rear ends. It comes with a locking bolt to tighten the bushing. You should use the information in this All we had to do now was work on consistency. It seems not being an Irak/bu . 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. This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. birdcage path and at least 3" of compression movement for the right These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. $149.99; 149 - Reward points. Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). West Coast Metric - Suspension Parts, Front & Rear. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. birdcage now moves rearward (until the link reaches a level Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". The length of the bottom links are dependent on the roll steer and what wold be the best angles to be at for most foward bite along with handling four all four links ? A 1/2 inch height change from level can make significant handling changes. BMS Racecars - Winning's not just a goal it's a tradition! Copyright Racelogic Chassis School 2023. Decrease Upper Control Arm Angle on the Rearend. 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. Can be used on both 9" Ford and quick change rear end tubes. We use the upper links on a 4-link suspension birdcage moves forward during chassis roll instead of rearward as in (Sold Individually). everything is a compromise. at least 3" of rebound movement for the left Here is how each system functions and how they can be adjusted for the "degree" of rear steer. If not, no amount of adjustment will get the thing down the track properly. Change your lead or trail of the rear end by simply changing the combination of offset slugs. sensitive to adjustments. front of the