I have tried different set ups with some success am now at 4.5 down The stock trailing arm mounting kit (part No. You can lengthen or shorten the bar by loosening the jam nuts on either end and turning the adjuster. 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. 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. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. Justin is the owner of High Roller Race Cars. (1-8 Coarse Thread), BRACKET, 3 LINK, NSM MOD, BOLT ON LH (MEDIEVAL ONLY 2016-2018), BRACKET, 3 LINK, NSM MOD, BOLT ON RH (MEDIEVAL ONLY 2016-2018), These caliper mount brackets are built to fit the small GM metric calipers. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). The front may be too stiff compared to the rear. The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. The entry is more important to design for than the exit as far as rear steer is concerned." An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. The significance of this, for the purpose of this article, is that the chassis travel in a Z-link is enhanced compared to the 4-link suspension when using the same installed spring rate, and this causes quite a bit of chassis travel and related rear steer. After subframe support arm is out of the way, unscrew the . The condition is referred to as
illustration 2A. Emirates offers flights to Ho Chi Minh City (SGN) and 139 other destinations. Adjustable rear trailing arms are also available for specific applications. efforts, will provide you with an advantage. 87 Chevy C10 upper control arms. Simply replace the LR bracket and have increase drive and adjustability. Rear steer in a circle track race car is a condition caused by suspension movement. 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 These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. 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. 4.0 from axle tube to center of hole. Under most current rules, there is no adjustment for amounts of rear steer with these systems. . This will make it easier to line up the new control arms when they are installed. Mike Kojima says: July 15, 2019 at 4:38 pm . Welcome Guest. 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. Maybe a up is a starting point. You should keep in mind that any loading of the rear tires caused by
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. 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. On the left side, the bottom
This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. forward(L.S.) 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. On extremely dry, slick conditions, use lots of rear steer to the right. . Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. Use this kit to build your own custom rear end. This was encouraging. 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. Now with Ten properly positioned holes . Looking for some help / opinions on the optimum lower control arm angle for 05+. One fix is to position the links so that the
birdcage does lose some of its rearward movement because of the
acceleration causes the rear axle & chassis to separate. The GM Metric adjustable rear trailing arms will aid in adjusting pinion angle, centering the rear end and adjusting wheel base. 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. Additional washer added on end to extended life of bushing in severe conditions. All we had to do now was work on consistency. AA-175-D. keep in mind the effect that indexing has on suspension stiffness. I am getting ready to change my lowers out to some better ones that are adjustable. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? rear tire to move rearward (until the arm/s reach a level position) and
The difference is, Id like to use the center post where the three link top link currently attaches to the chassis, and go out to brackets at the ends of the rear axle. Typically, indexing causes the coil-over mounts, if located on the
Generally, bottom link angles from 0 to 5 downhill (to the front)
This condition will cause loose handling-especially
The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. The top links are angled from a top view with the front pivots wider than the rear pivots. chassis up during acceleration which can reduce the effectiveness of the
The rear semi-trailing arm suspension is an independent rear suspension system similar to the pure trailing arm suspension, with the primary difference being that the bushing axis (or instant axis) runs at an angle in all X, Y, and Z directions. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Assembly Price). 122. steer may increase whenever both bottom links are shortened! Adjust Cross Weight as changes are made to keep the car neutral. preceding paragraphs should help you understand why. The length of the bottom links are dependent on the roll steer and
Made out of 1/2 thick steel to gain extra LR weight. That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. shortening the lower links, is a reduction in loose roll steer. Our services include: Bushing overhauls, suspension repairs . The upper trailing arm mounts (part No. I want just for street use, nothing but just Soft Ride. We can relate 1/8-mile e.t. 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. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. The upper arms are angled to form the triangle that gives the suspension its name. Conversely anti-dive is used to describe how much a chassis nose dives under braking. The 2-day class is broken down section by section. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. Avoid these types of trailing arms for drag racing. Housings havefill and drain plug installed. 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. right, the left rear tire can become loaded more quickly than the right
Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. On a tacky track, the team would do well to limit rear steer on both sides of the car. Loose roll steer causes the rear axle to steer towards the outside of
. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? 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. The
Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. At the nose, Id do the same (spherical bearings or Delrin bushings). The amount of rear steer due to body roll is regulated by the height of the front mounts of the arms, which are always mounted lower than the rear point of rotation (the axle). (during acceleration) is quickened and forward bite is enhanced. Decrease Upper Control Arm Angle on the Rearend. You can counteract this force by preloading the suspension. Keep in mind that trailing arm angles can become
My trailing arms are stock triangulation. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. The front locating points must be in the stock locations. Rear ends are straightened after jigging for truer alignment of axles to 3rd member. Bolt On, Clamp-3 Chain Limiter w/ Chain and Adjuster Kit, Bolt On, Trailing Arm Bracket Kit XTREMER LR, Bolt On, Trailing Arm Bracket Kit (2.5 SINGLE HOLE), Bolt On, Trailing Arm Bracket Kit (2.5 SLOTTED), Bolt On, Trailing Arm Bracket Kit Extreme Drop LR, Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Single Hole (LR Only), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (Kit), Bolt On, Trailing Arm Bracket Kit HEAVY, Slotted (LR Only), Bolt On, Trailing Arm Bracket Kit Multi Hole, Bolt On, Trailing Arm Bracket Kit XTREMER. forward on the left side during chassis roll. clamp brackets to mount the left coil-over unit ahead of the axle
We hope the information in this article, combined with your
4-link, or use the design parameters mentioned in this article, to help
designing and tuning a 4 link is to understand the significance of these
Mounts J-Bar to QC rear end 4 3/8 offset from pinion. My car had 7Deg of angle it. The key to correctly
The roll angles and vertical movement on a dirt car can be very pronounced. In this case, that equates to a 10.80. to be loose. It may not display this or other websites correctly. 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. Wayne thanks for the input My lower trailing arm is level. 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. Thats not necessarily bad. So, teams need to take this rate difference into account. I also have a trz weld in style arb. A 4-link
The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. "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. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Jul 23, 2001. Suspension Parts, Front & Rear parts . It takes less than two hours for an experienced welder to install the kit.. The rear axle
The first element to understand about rear steer is that it is caused by rear suspension movement. 1/2" on RF (5 degree angle of Upper A-Frame mounting bolts), 1/4" on LF, front higher than back, average bolt height the same as before. Which ones do you recommend? (Steel). Copyright Racelogic Chassis School 2023. Jigged with our: Set. try to drive underneath the chassis as the rear axle pushes the race car
Wehrs Modified Valance Support Weld On Clevis. As the suspension in a car wraps up, the pinion is driven upward. NOTE: Adjustable . Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. cause a gas pedal push. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. Then, a 1" weld on the bottom inside of the left side." Description. Learn how your comment data is processed. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . The setup is balanced when the LF and LR tire temps are similar. Indexing is greatest when there is a lot of
The bushings wore out in the lowers and my left tire got in the wheel tub. Wayne Compare the measurements to specifications. 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. front of the
He uses his knowledge as a racer to continue to innovate his chassis designs. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. This configuration is common in General Motors cars built in and around . Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). Not sure if there are any big "Tricks". Many teams use varying amounts of rear steer to adjust to constantly changing track conditions, a product of variations in moisture content so common in dirt racing. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. #2. pat the angle of the trailing arm wont really effect anything that much. A 1/2 inch height change from level can make significant handling changes. As a result, the loading of the rear tires
At best, any trailing arm arrangement is a compromise between
Dartmouth, Nova Scotia. Decrease the Split on the Rear Panhard Bar Heights. Part No. birdcages caused by the upper links. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. The popularity of the 4-link suspension is due primarily to its
We can reduce loose roll steer further by lowering the
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. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. length and/or angle difference in the upper and lower links. clamp brackets are used in front of the axle, axle wrap-up during
Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . We could reduce loose roll steer even further by combining the long
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. Designed for the Wissota street stocks, these trailing arm brackets have the lowest mounting hole position possible. 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. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). (Try to bounce the rear of a car with a 4-link rear
how the shortened bottom link pulls the bottom of the right side
Heres a look at an adjustable upper trailing arm fitted to a GM G-body. The rear will have Viking coil over shocks . Now available value added Metric Rear Control Arm . using stock coil springs new .have adjustable uppers and The live class took place January 22-23, 2022. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. Can be used on both 9" Ford and quick change rear end tubes. Preload is another tuning tool to counteract body roll rotation. July 1st. Do I need to change my angles on my trailing arms to get forward bite? Required fields are marked *. As we stated earlier, the 4-link is a fairly complicated rear
This raised the rear roll center and hurt side bite, but aided forward bite. Short links( from 3 to 4 shorter than the upper links) generally work
But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. 3 to 4 degrees nose-down is recommended. shocks and springs. (and tire) are forced towards the race track. However, the
Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. just ordered the adjustable lowers We use the upper links on a 4-link suspension
The idea is to trace the paths actually
The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. C.J. On extremely slick race tracks, you
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. Below you'll find a selection of our flight destinations to spark your interest. Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. birdcage moves forward during chassis roll instead of rearward as in
If excessive, loose roll steer can cause a loose
This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. We can reduce
LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . suspension bump (compression) movement. Thanks so much! move the
When selecting springs for your 4-link, you should
Trailing arms must also be running forward at the correct car builder design angle. "High left-rear loading does not increase traction," he said. this important function of the lower links. 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. reducing loose roll steer. The upper arms is where many very in opinion. Facebook; Twitter; Youtube; Pinterest; contact us . Trailing arm bushings come included (part No. 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. When the track goes slick, especially dry slick, rear steer is needed. Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. Add to cart Details. . Bushings in Upper Mounts 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. the race track. the bottom links are lowered but the effect on forward bite is usually
Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. AA-621-C is an offset spring cup, which sits 2-1/2 off center of a 3 axle tube $14.95. With so much movement, we can plan out our rear steer just about any way we need it. The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. Decrease the Pre-Load on the Front Stabilizer Bar. Specialize in complete bushing overhauls and suspension upgrades to enhance the driving experience for your Mazda RX-7, Mazda RX-8, and Classic Mazdas (R100, RX-2, RX-3) but are more than capable of servicing all cars with the same care and attention to detail. Order your Trailing Arm 2 Piece Set - today at 1AAuto.com. The bearing allows for smooth movement without the binding a rubber bushing can cause. of a 4 link suspension are the link lengths designed into the suspension
This induces rear steer when the car squats on exit. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and Limited Mods. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. 3. birdcage now moves rearward (until the link reaches a level
The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. birdcages typically move down much less than right side
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. On asphalt, do not make large changes to components that influence rear steer. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. I have edelbrock adjustable uppers with non adjustable boxed lowers. Stronger is Better. $ 599.95. Tubular arms are constructed of 1 1/4" diameter .120" wall steel tubing, which offers increased strength over other designs and also has the added advantage of lighter weight. 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. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. The Impala spindles are the " hot set up " on a metric chassis. you to better understand the 4-link suspension. A 200-pound spring in a Z-link car feels more like a 4-link car, where the coilover is mounted to a birdcage with a 100-pound spring installed. Part No. 88 metric lower trailing arm $65.00. Outside Groove Note of Transparency: A&A Manufacturing paid for the production of this article. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. [3] Advantages of Trailing Arm with Camber Links That saved the factory some money. Tack weld the slugs to secure them to the trailing arm. Compared to the 4-bar cars, it has more limited adjustment for rear steer and historically has worked well on the tighter and more highly banked race tracks because the rear end is pointed more straight ahead. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). priority to have the trailing arm brackets and top link hardware to be located in the proper location. Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. CTS Upper Metric Trailing Arm Mounts for Ford 9 inch housings. Most will run the LR angled down in the back. You can evaluate the roll steer characteristics of different set-ups
It comes with a locking bolt to tighten the bushing. correctly. They constantly introduce new products to their lineup. very stiff. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. Also, how old are the shocks and have you ever had the valving checked? In turn, that bite tends to move the car toward the left. birdcages move up during chassis roll, the overall effect, when
See all 6 photos. ance with altitude u p to the equilibrium line. Again the height of the mounts are critical as to the resultant force transmitted. if the left rear of your chassis hikes up during cornering, loose roll
The following examples and illustrations should help you to understand
. Dave here in Saskatoon been racing a g body for many years now and struggle to get With stock brackets on . birdcages during chassis roll. the indexing and the link angle changes during roll or bump. Can I convert a combustion engine car to a hybrid car? Where did I run mine? Wehrs Metric Trailing Arm Bolt. 2-3 Starting Points for Bar Angles. Also has a anti roll bar added to it. Some forward bite may be lost when
Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). These systems only steer to the left and have a limited amount of steer. AA-621-A fits 3 axle tubes $14.95. We stated earlier that trailing arms mounted upwards to the front of
Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. Raise the front LR trailing arm mount. Long bottom links (equal in length or no more than 1
The Setup with Shane Tesch Topic - Center Pull #shorttrackracing #metalfabricator #latemodelstockcar #metalfabrication #chassisfab #stockcar #metalfab #motorsports #portcityracecars #superlatemodel #chassis #racecar #asphaltracing #pavementracing #racingparts As a result, we reduced loose
made to provide such handling, you must first understand a few basics
link lengths and angles and how the relationship affects roll steer and
Make small adjustments if you feel a need. He will be showing the latest tools to enhance your chassis set up. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. I am settling 1100 hp LS Irwin turbocharged in it. Matt, 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. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. A racer himself, he was the winner of the Street Stock Nationals in 2019. 2.50 from axle tube to center of hole. To understand how a 4-link can be
right and 10 to 15 on the left provide good forward bite. (Sold Individually). I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . 9-5 Upper A-Arm Mounting Points Metric. forward bite and roll steer. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. KT-1A). Bars like this are typically welded into the chassis and tied to the housing by adjustable links. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. The length of the upper links should be at least 17" . This caliper mount brackets is built to fit the small GM metric calipers. 4. The length of the upper links should be at least 17" . Also pinion angle with stock bushings. The problem with some trailing arms made for Mustangs and GMs A- and G-bodies is they tend to create a very short (further from the engine) instant center by changing the angle of the bars. OUT OF STOCK until appox. There are limits to how far we go in steering the car this way. Dave's Tip - "You should always tack weld them in place. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. However, indexing can cause the rear suspension to be too harsh
To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. chassis. A trick way to produce rear steer only under acceleration is by staggering the height of the two trailing arms in the 3-link system when using a pull bar, upper-third link. Phone (07) 31033011 Between - 9:30am - 4:30pm. These are BMR upper trailing arms for 1979-2001 Mustangs. No more than 10-15 pound difference, excess split makes car tight. A/C Condenser APDI 7013457 fits 2006 Mitsubishi Eclipse, Mevotech TTX Front Lower Suspension Ball Joint for 1998-2018 Subaru Forester vc. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical.
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