The company also sells ultra-lightweight rear . Then this trailing arm bracket kit is a must have. A lot of guys take that to extremes.". But
Lower the front LR trailing arm mount. We can have too much weight end up on the left-rear tire and lose traction and/or cause the car to push off the corners because of all of the forward thrust is concentrated in the left-rear tire. 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. AA-621-C is an offset spring cup, which sits 2-1/2 off center of a 3 axle tube $14.95. You can Watch, Rewind, and Watch Again. In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. and parallel to each other). Increase Left Rear Spring Rate. Suspension Division. coil-over units on
are used to help control loose steer. You can see how this adjustment works in illustration 2B. corners. 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). UMI part numbers are 4023CM-B or 4023CM-R. preceding paragraphs should help you understand why. A 4-link
There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. Mike Kojima says: July 15, 2019 at 4:38 pm . My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. As a result, the loading of the rear tires
Reply. 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. 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. A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. How Much is Too Much? Rayburn builds the swing-arm type of rear suspension. very stiff. The variation of height for the right-rear trailing arm is very small. without compromising forward bite. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. 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. To understand how a 4-link can be
on rough race tracks. Housings havefill and drain plug installed. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. The A & A Manufacturing stock trailing arm mounting kit (part No. 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. suspension). On a tacky track, the team would do well to limit rear steer on both sides of the car. 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. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. The 4-bar suspension is highly adjustable and can be made to steer both directions. Picture does NOT represent all jig options. But since left side
Here is how each system functions and how they can be adjusted for the "degree" of rear steer. Lower the Rear Panhard Bar on both sides. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. As a result, loose roll steer is reduced. if the left rear of your chassis hikes up during cornering, loose roll
Followed your advice and got a set of adjustable lowers. 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. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. positioned ahead of the axle and attached to
Adjust Cross Weight as changes are made to keep the car neutral. Condition: New. efforts, will provide you with an advantage. . Decrease the Rear Weight Bias. However,
A difference of heights can help or hurt rear traction. The condition is referred to as
Where did I run mine? And have fun at SIR! Richards added that today, the Z-link or swing-arm suspension can have nearly as much rear steer as the 4-link, without the excessive loading of the left-rear tire. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. 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. 650 whp. A racer himself, he was the winner of the Street Stock Nationals in 2019. On asphalt, do not make large changes to components that influence rear steer. Wayne This condition may
In simple terms, it keeps the body from roll rotating on the launch. shocks and springs. you to better understand the 4-link suspension. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. (Steel). On extremely slick race tracks, you
KT-1B) sells for $96.00. 9-5 Upper A-Arm Mounting Points Metric. With so much movement, we can plan out our rear steer just about any way we need it. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction Adjustable trailing arms will allow you to set the static pinion angle. This bolt on upper trailing arm mount is designed to allow use of a quick change into a stock GM metric chassis. Under the wrong conditions, it can ruin your handling. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. AA-175-D. This one is made by Hotchkis for GM A-body cars. 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. See all 6 photos. Upper link angles from 15 to 18 on the
Adjustable 73 - 77 . short bottom link arrangement of illustration 2D on the right side. rear tire to move rearward (until the arm/s reach a level position) and
This induces less rear steer when the car squats on exit. Putting the stock "W" style suspension into a bind is your biggest enemy. Can I convert a combustion engine car to a hybrid car? Increase the Split in the Panhard Bar Heights. BRACKET, CHASSIS PANHARD, BOLT ON 3 INCH OFFSET (PAIR). This action will cause
Copyright Racelogic Chassis School 2023. To see if rear steer is an important tuning tool, we turned to some experts. Wayne thanks for the input traction characteristics desired by the chassis tuner. Dave is the owner of Hammond Motorsports. Sep 1, 2009. excessive if the rear of the chassis lifts a lot during acceleration. Large 1 NPT fill plug installed for easy filling or connecting to fill tank. right side link is from 3 to 5 higher than the left when the chassis
the indexing and the link angle changes during roll or bump. You are using an out of date browser. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. springs). Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. 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. Heres a better look at a trailing arm mounting brace. Masters added, "Any time we can press air against the sides of the car, we can help the car to turn." Those conditions rarely exist on dirt. . They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. shorter than the upper links) work best for fast tracks or on any track
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. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. (on a clamp bracket) generally tightens corner handling. You can evaluate the roll steer characteristics of different set-ups
It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. right side
In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. 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. The roll of the chassis and the movement of the Panhard bar are the two components that influence the amount of steer in these systems. Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. 87 Chevy C10 upper control arms. The upper trailing arm mounts (part No. Wehrs Bent Suspension Bar Angle Finder. wenee9w Pit Crew. 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. Raise the front LR trailing arm mount. Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". am out of adjustment on the uppers so will be installing a set of adjustable lowers The upper trailing arms are pretty much in the stock location. the bottom of the
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. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. The entry is more important to design for than the exit as far as rear steer is concerned." Phone (07) 31033011 Between - 9:30am - 4:30pm. 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. In turn, that bite tends to move the car toward the left. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Trailing Arm Brackets 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. suspension moves (unless both upper and lower links are equal in length
We can see the effect of the Sprint Car wing in the turns-as the cars actually roll left due to the pressure differential developed on the flat wing sides-as the cars go sideways at a high speed. It comes with a locking bolt to tighten the bushing. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. As a result, the springs and
This induces less rear steer when the car squats on exit. NOTE: Adjustable . These conditions call for a driving line that is more straight ahead. 6. Ground clearance at bump and uptravel at ride height will dictate link angle. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. We can relate 1/8-mile e.t. So, teams need to take this rate difference into account. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. The front locating points must be in the stock locations. As the suspension in a car wraps up, the pinion is driven upward. In order to keep the driveshaft and U-joints operating in a (more or less) straight line when youre on the throttle, the pinion angle has to be correct. 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. There can be a handling trade-off, however, to the forward traction
The company manufactures the kits lower trailing arm mounts (part No. loose roll steer. Unbolt and remove one upper rear control arm using a " wrench. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. Decrease RR Trailing Arm length by 1/8 inch. Justin is the owner of High Roller Race Cars. Loose roll steer causes the rear axle to steer towards the outside of
Maybe a up is a starting point. One disadvantage is pointed out by Masters. cause a gas pedal push. Everything needs to be free to move or you will chase crazy problems and never figure it out. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). made to provide such handling, you must first understand a few basics
the race track. Replacing the worn out rear trailing arms and bushings will reduce wheel hop and axle wrap that occurs during racing. When using trailing arm angles to help your setup it pays to truly understand the movements at each section of the corner as well as think about any drawbacks that rear steer or understeer might create. The
Now with Ten properly positioned holes . (Try to bounce the rear of a car with a 4-link rear
Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. The track in this case was banked and had a lot of grip. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. the race car upon corner entry -especially when both coil-over units are
Any angle up hill to the right rear will cause upward force on both tires and unload both tires. 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. the left rear tire to move forward. Notice, in illustration 2D,
3. Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. birdcages move up during chassis roll, the overall effect, when
Suspension movement usually increases when the coil-over units are
right amount of loose roll steer can help a race car to turn the corner
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. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? Cf: a c t i v i t . For most track
The side bite trade off is a big one. That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. 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. at least 3" of rebound movement for the left
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. Decrease the Pre-Load on the Front Stabilizer Bar. OUT OF STOCK until appox. 4.0 drop trailing arm brackets slotted to accept offset slugs. length and/or angle difference in the upper and lower links. handling condition that negates the benefits of the forward bite gained
These trailing arm brackets use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. on rough race tracks. Owner-operator at Race Products Inc. all the best parts. (USRA/IMCA Stock Car Legal). I had 17 Deg of angle in my car, down in front and up in back. Hi DaveGlad to help if I can. KT-1A). You may be required to make chassis adjustments to
MAXIMUM Performance right side climbing panhard mount for quick change rear ends. clamp brackets during acceleration will be accompanied by an
It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. you will speed up your learning process by working with a model. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. Get your shocks addressed (tested by someone with a shock dyno who knows what theyre doing) and then go back and work on the pinion angle, using the guidelines from the article. LR bracket is 6.75 from axle tube to center of bottom hole. birdcage rotates or "indexes" on the axle tube whenever the
Click here to remove banner ads from this forum. The instant center is also rather high; the angles of the bars can raise it somewhere above the front wheel spindle. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. "We have always wanted rear steer," he said. Built with corrected pinion angle and our proven "Pull" Bushings. On extremely dry, slick conditions, use lots of rear steer to the right. (Sold Individually). * puts the roll center 3.3 inches off the ground. clamp brackets are used in front of the axle, axle wrap-up during
Kit includes required Custom length Double Adjustable upper control arms. shocks are compressed from both ends at once and the suspension becomes
change of 5 can make a noticeable change to handling. 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. Make small adjustments if you feel a need. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. 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.