Notice how this The A & A Manufacturing stock trailing arm mounting kit (part No. Ask me how I knowL-O-L. Hope that gets you sorted out. Consequently, a further reduction in loose roll steer results. Realize that you can increase forward bite on any type of rear It seems not being an Irak/bu . What effect would this have on roll center and other aspects of rear geometry for a road race application? link lengths and angles and how the relationship affects roll steer and When the track goes slick, especially dry slick, rear steer is needed. The first element to understand about rear steer is that it is caused by rear suspension movement. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. starting point for both links is 15 upwards (to the front). 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. This will give you a lower rear roll center and aide side bite. forward bite and roll steer. Pinion angle is measured between the pinion gear flange and the driveshaft. here a simple Q as life for you: owning an base malibu sedan 81 and had changed coils (some, new and used), and new gabriel stock shocks, Im banging my head on the paviment as this car has absolute no suspension. Some forward bite may be lost when The condition is referred to as We use the upper links on a 4-link suspension Its on a car that Im helping with. at least 3" of rebound movement for the left 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. In this case, that equates to a 10.80. A good 2.50 from axle tube to center of hole. you to better understand the 4-link suspension. #2. pat the angle of the trailing arm wont really effect anything that much. 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. We can relate 1/8-mile e.t. Cf: a c t i v i t . Maybe a up is a starting point. Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. As a result, the springs and We can reduce This saves wear and tear on your U-joints while . Not sure if there are any big "Tricks". 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. birdcage moves forward during chassis roll instead of rearward as in AA-175-D. Made out of 1/2 thick steel to gain extra LR weight. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). bottom links further as shown in illustration 2C. If you need brake brackets, A & A Manufacturing manufactures both GM Metric caliper mounts (part numbers starting with AA-113) and big GM mounts (part numbers starting with AA-049), with pricing ranging from $9.82 to $15.84 per bracket. If you lengthen the same bar, more load is placed on the left rear tire. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. The length of the upper links should be at least 17" . This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. Rayburn of Rayburn Race Cars, a driver as well as a car builder, echoed much of what the other buiders had to say. Can be used on both 9" Ford and quick change rear end tubes. birdcages typically move down much less than right side You can counteract this force by preloading the suspension. Photo courtesy of Hotchkis Suspension. extremely short links change their angles radically whenever the movements of the (more on this later). clamp brackets. We could reduce loose roll steer even further by combining the long illustration 2B where the links are level. If excessive, loose roll steer can cause a loose This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. On extremely slick race tracks, you Trailing arms mounted in this manner cause the rear tires to As a result, we reduced loose One disadvantage is pointed out by Masters. 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. 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. Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. 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. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. article to determine the correct link lengths for your application. handling condition that negates the benefits of the forward bite gained The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. suspension moves. Also, how old are the shocks and have you ever had the valving checked? When you find the correct amount of rear steer, stay there and tune the handling with the other components. 88 metric lower trailing arm $65.00. In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). The roll angles and vertical movement on a dirt car can be very pronounced. If you run the frame side of the J-bar is higher . Below you'll find a selection of our flight destinations to spark your interest. Increase Left Rear Spring Rate. The upper arms is where many very in opinion. 1 diameter x 11 long weight jack bolt. (Sold Individually). 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. The layout, lengths, and angles of the upper A-Arm work together with Lower Control Arm to encompass what engineers refer to as an Instant Center. Phone (07) 31033011 Between - 9:30am - 4:30pm. Rear steer can either tighten a car or make it very loose. AA-175-D. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. Bars like this are typically welded into the chassis and tied to the housing by adjustable links. Decrease the Pre-Load on the Stabilizer Bar. length and/or angle difference in the upper and lower links. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . The adjuster is at the front of the bar. At best, any trailing arm arrangement is a compromise between Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. to be loose. Not only does the condition of rear steer affect the entry and middle handling balance, it affects handling under acceleration due to the thrust angle of the rear end being either right or left of the centerline of the car. 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. 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. Used on millions of cars - BMW, Mercedes, Ford and even Rolls Royce - semi-trailing arm rear suspension had some huge advantages. 266. Designed for stock cars with a 7.5 max trailing arm length. Under the right conditions, rear steer can be beneficial and enhance performance. A triangulated four-link puts the instant center (I/C) locationthe imaginary point of where the rear suspension components intersect, and the point theyrotate around in a given (instant) positionway out front, often close to the engine. 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. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. They are: 1. Part No. The top links are angled from a top view with the front pivots wider than the rear pivots. AA-621-B fits 2-5/8 ones $14.95. This condition may (Sold Individually). Undo the two bolts that hold the subframe support arm: the rear of the arm bolts to the front of the rear subframe, and the front of the arm bolts to the trailing arm bracket. Dave here in Saskatoon been racing a g body for many years now and struggle to get The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. Adjustable trailing arms will allow you to set the static pinion angle. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. If the car has OEM style rubber suspension bushings, a pinion angle of minus three to minus four degrees is more appropriate. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. Condition: New. The idea is to trace the paths actually Now available value added Metric Rear Control Arm . currently using 4.5 down and it picked up 60. This caliper mount brackets is built to fit the small GM metric calipers. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). Heres a look at an adjustable upper trailing arm fitted to a GM G-body. Among Adaskavegs many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year. 4.0 from axle tube to center of hole. So how do you make it work? JavaScript is disabled. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. Thanks . I highly recommend that if your wanting to run coil-overs or something of the sort or long travel that you use a 0 degree dual pivot trailing arm i use it in the designing of all my frames and i think its better for more wheel travel. OUT OF STOCK until appox. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction Clamp brackets are sometimes used on short, slick tracks to improve The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). Skip to main content. Youll find that an instant location similar to stock is actually close to optimum, provided you dont jack the body way up in the air. The two most critical factors to the performance Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. by comparing the different paths drawn on your model. When one wheel moves more than the other, we have a certain amount of rear steer. Our services include: Bushing overhauls, suspension repairs . Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. We can reduce loose roll steer by lowering the bottom links at the I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . 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 note the left rear tire moves to the front in body roll. Excess loading of either the left- or right-rear tires decreases traction in most cases. forward (See illustration 1). The setup is balanced when the LF and LR tire temps are similar. Your email address will not be published. minor relative to the overall handling improvement that is realized by to enhance the forward bite. 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. 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. West Coast Metric - Suspension Parts, Front & Rear. The system works well enough on the street, but not so well when it comes to hooking up at the drag strip, especially with big horsepower. One of the things we have done, is to raise the rear ride height. 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. loose roll steer by making the lower links shorter than the upper links Part No. Lower the Rear Panhard Bar on both sides. can tighten overall corner handling by using See the text for more information. with the very soft chassis meaning floppy front subframe is 4.5 enough? 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. Usually, the right-rear corner of the chassis moves more than the left-rear. 2. $ Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. But since left side 2). You can evaluate the roll steer characteristics of different set-ups Your email address will not be published. For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. ability to let the race car turn freely in the middle of the corner The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. It uses four links, as the name implies, that are not parallel to the centerline of the car. correctly. On the left side, the bottom birdcages and mounted to I do have a few questions though: Are you running the car with an Anti Roll Bar or at the least, with a sway bar on the back? 2- 175-B upper mounts. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). You should use the information in this Decrease LR Shock rebound and/or increase RF Shock compresion. rear tire to move rearward (until the arm/s reach a level position) and $64.00. We highly recommend that you build a full-scale working model of your Most will run the LR angled down in the back. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. This is correct. Adjustable arms allow easy rear suspension . My trailing arms are stock triangulation. 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. These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets "We have always wanted rear steer," he said. When racing on dirt, watch the conditions and be prepared to make changes accordingly, not just to the setup, but also related to rear steer. I will post as I no longer race, the biggest thing is the angle of the upper and lower control arms in the rear, you need to understand roll center and instant center to be able to adjust it correctly. Mounting both Adjust the length of the control arms as needed to achieve the desired pinion angle. With stock brackets on . The key to correctly Suspension Type Camber Angle; FWD: Multilink Trailing Arm Twist Beam: 1.0 1.0 1.0 RWD: Multilink Trailing Arm Swing Arm: 1.0 1.0 1.3 AWD: Multilink Double Wishbone Trailing Arm: 1.0 1.0 1.0 4WD: Multilink Double Wishbone Trailing Arm: 0.5 0.5 0.5 Large 1 NPT fill plug installed for easy filling or connecting to fill tank. and the right coil-over unit behind the axle. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. Also pinion angle with stock bushings. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. "Rear steer is important in any design of dirt car." This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. Great info! The 2-day class is broken down section by section. adjustment, positioning the lower links 5downhill, causes the bottom of 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. Decrease the Angle of the Upper Trailing Arm. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . Tack weld the slugs to secure them to the trailing arm. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. birdcages, to rotate against the shocks and springs during Make small adjustments if you feel a need. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. birdcage path. right side wood, aluminum strips, etc. 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. Performance Disc Brake . Hi DaveGlad to help if I can. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. Part No. Avoid these types of trailing arms for drag racing. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. Wehrs Metric Trailing Arm Bolt. 122. 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. My car had 7Deg of angle it. gained by running the trailing arms upward to the front of the race car. roll steer are overly affected and handling becomes inconsistent. Raise the Rear Panhard Bar Up on both sides. how the shortened bottom link pulls the bottom of the right side I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks 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. That saved the factory some money. using stock coil springs new .have adjustable uppers and MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Keep in mind that any change to the A difference of heights can help or hurt rear traction. just ordered the adjustable lowers But Has boxed lowers, adjustable uppers , stock springs and shock. Required fields are marked *. The RR lower most will run level. mounted 5 downwards to the front, coupled with 17 1/2 top links, "loose roll steer". The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. birdcages during chassis roll. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. 4. Change your lead or trail of the rear end by simply changing the combination of offset slugs. am out of adjustment on the uppers so will be installing a set of adjustable lowers right, the left rear tire can become loaded more quickly than the right Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. by running the trailing arms upward towards the front. Simply replace the slug with different combination of offset slugs. try to drive underneath the chassis as the rear axle pushes the race car Be aware that trailing arms angled uphill too steeply can hold the But it also had downsides . Set. A rear end that is steered to the right of centerline causes the thrust angle to be pointed to the right of centerline and makes the car loose on entry and loose on exit under acceleration. Simply replace the LR bracket and have increase drive and adjustability. Decrease the Rear Weight Bias. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. 3. Since we cannot lump them together, we will analyze them separately. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. 2-3 Starting Points for Bar Angles. A smooth entry provides a faster exit. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. It comes with a locking bolt to tighten the bushing. As far as the geometry related to rear steer is concerned, this is an ideal system. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? Change your lead or trail of the rear end by simply changing the combination of offset slugs. illustration 2A. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. move the An anti-roll bar can also be mounted on the rear axle housing. LR bracket is 6.75 from axle tube to center of bottom hole. Raise the front LR trailing arm mount. the race track. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. Mounts J-Bar to QC rear end 4 3/8 offset from pinion. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. A well designed 4-link provides good forward bite and the proper This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. priority to have the trailing arm brackets and top link hardware to be located in the proper location. amount of roll steer. I like to see a 1" long weld on the top inside of the right side. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Thanks so much! corners. Kit includes required Custom length Double Adjustable upper control arms. the indexing and the link angle changes during roll or bump. when making this adjustment. bottom link arrangement of illustration 2C on the left side and the One of the reasons a car will test fast in practice, qualifying, and maybe the heat races, but then be out to lunch when the track changes come feature time, is a result of improper rear steer. Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. There are limits to how far we go in steering the car this way. Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. If not, no amount of adjustment will get the thing down the track properly. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. The left-rear suspension is designed so that when that corner raises up, the arms are angled, pulling the left-rear wheel forward towards the driver. birdcage to move forward more during chassis roll than in Jul 23, 2001. excessive if the rear of the chassis lifts a lot during acceleration. Mike Kojima says: July 15, 2019 at 4:38 pm . RAceman. suspension). I also have a trz weld in style arb. The company offers a wide array of quality chassis components at reasonable prices. If we mount the left-side trailing arm lower than the right-side trailing arm, then as the rear end rotates under acceleration due to the pull bar extending, the left-rear wheel will move rearward more so than the right-rear wheel, causing rear steer to the left to a small degree. clamp brackets and ahead of the axle can improve forward bite on Increase the Split in the Panhard Bar Heights. I have a blown 71 Chevelle. REAR - On each side of the vehicle, measure the distance (2) from the center of the outboard trailing arm-to-body mounting bolt (1) to the floor or alignment rack/lift runway surface. There can be a handling trade-off, however, to the forward traction You can also check Since then, hes been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. Trailing arm bushings come included (part No. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No.