This one is made by Hotchkis for GM A-body cars. loose roll steer tendency caused by the steep angles of the upper links. Most will run the LR angled down in the back. shortened bottom link. during acceleration (due to the axle thrust effect). 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. Ground clearance at bump and uptravel at ride height will dictate link angle. Bad shocks (and/or messed up valving) can be the culprit. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. RAceman. The following examples and illustrations should help you to understand
Bars like this are typically welded into the chassis and tied to the housing by adjustable links. traction characteristics desired by the chassis tuner. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? Thats not necessarily bad. A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. Lower the front LR trailing arm mount. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Increase the Angle of the Upper Trailing Arm. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. For a better experience, please enable JavaScript in your browser before proceeding. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? July 1st. Built with corrected pinion angle and our proven "Pull" Bushings. KT-1B) sells for $96.00. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). This will give you a lower rear roll center and aide side bite. Those conditions rarely exist on dirt. tuning a 4-link, it is important to understand the relationship between
1-15 How Important is it to Bump the Left Front? Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. All we had to do now was work on consistency. At the nose, Id do the same (spherical bearings or Delrin bushings). They constantly introduce new products to their lineup. 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. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. AA-175-C). We stated earlier that trailing arms mounted upwards to the front of
As a result, loose roll steer is reduced. 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. Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. Housings havefill and drain plug installed. 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. of the
Notice, in illustration 2D,
Dartmouth, Nova Scotia. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. OUT OF STOCK until appox. gained by running the trailing arms upward to the front of the race car. But since left side
Heres a better look at a trailing arm mounting brace. Just as bad, some of the top-mount arms (ones that physically raise the upper trailing arm location on the rear end housing) have a tendency to hammer the trunk floor when you get on the throttle. Add to cart Details. What is wrong ? Remove only one control arm at a time. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. Change your lead or trail of the rear end by simply changing the combination of offset slugs. 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. 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. Avoid these types of trailing arms for drag racing. We can use the lower links of a 4-link suspension to help offset the
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. When one wheel moves more than the other, we have a certain amount of rear steer. The rear will have Viking coil over shocks . and rearward (R.S.) Now with Ten properly positioned holes . Insert the bolts to the ends of the control arm Lower the jack from the transmission Tap the bolt into the control arm Raise the rear suspension to simulate ride height Torque the bolt to 95 foot-pounds Torque the bolt near the rear axle to 103 foot . coil-over units on
change of 5 can make a noticeable change to handling. Kit contains: (2) Rear upper control . . A link length change of 1" or a link angle
Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. The company manufactures the kits lower trailing arm mounts (part No. If you run the frame side of the J-bar is higher . 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. excessive if the rear of the chassis lifts a lot during acceleration. 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 racer himself, he was the winner of the Street Stock Nationals in 2019. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Your email address will not be published. [3] Advantages of Trailing Arm with Camber Links US $239.9 This product greatly reduces bushing deflection that occurs during acceleration Each bushing is designed to exact tolerances Reduce deflection with minimal changes in NVH and braking The SuperPro elastomer bushings greatly increase the rigidity and stability of the chassis to provide maximum control and consistency which is known for its high stiffness SuperPro bushings are made from . link lengths and angles and how the relationship affects roll steer and
I am dropping my ride height 2. Dave's Tip - "You should always tack weld them in place. Now you have to compensate with spring change. Adjustable 73 - 77 . This configuration is common in General Motors cars built in and around . Decrease the Angle of the Upper Trailing Arm. sensitive to adjustments. Reply. Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. Wehrs Modified Valance Support. 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. 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. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. Ask me how I knowL-O-L. Hope that gets you sorted out. 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. birdcages move up during chassis roll, the overall effect, when
you will speed up your learning process by working with a model. Realize that you can increase forward bite on any type of rear
can tighten overall corner handling by using
This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . at least 3" of rebound movement for the left
extremely short links change their angles radically whenever the
9-5 Upper A-Arm Mounting Points Metric. Under most current rules, there is no adjustment for amounts of rear steer with these systems. of a 4 link suspension are the link lengths designed into the suspension
This arrangement: * puts the instantaneous center 199 inches from center of car. It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. The
However,
These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. Looking for increased forward bit and traction? He will be showing the latest tools to enhance your chassis set up. Wehrs Bent Suspension Tubes 5/8"-18 Thread. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . Jigged with our: Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. When selecting springs for your 4-link, you should
Conversely anti-dive is used to describe how much a chassis nose dives under braking. Made out of 1/2 thick steel to gain extra LR weight. $ 599.95. #2. pat the angle of the trailing arm wont really effect anything that much. We never need our suspension to steer the rear end to the right of centerline on asphalt. LR bracket is 7 from axle tube to center of bottom hole, but still conforms to the 7.5 max length rules. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. All driving train actually repalced with Moog components.. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. the other illustrations. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. 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. Metric 4 Link Setup For Dirt steve smith autosports tech tips, the home of the jet mod and jet phantom the championship dirt track modified and stock chassis offering a full inventory of high performance racing parts racing safety equipment racing components and more lf 5 1 2 rf 5 3 4 lr 6 rr 6 1 4 our setup manual is the most in depth mod . Facebook; Twitter; Youtube; Pinterest; contact us . 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. In this case, that equates to a 10.80. These arms also use rod ends on each end to prevent binding when under load. $149.99; 149 - Reward points. My upper a arm is at a 10 degree angle pointing down towards the front. AA-621-B fits 2-5/8 ones $14.95. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. Wayne Scraba is a diehard car guy and regular contributor to OnAllCylinders. This helps make the rear steer characteristics more adjustable for the changing conditions. 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. right amount of loose roll steer can help a race car to turn the corner
you to better understand the 4-link suspension. Large 1 NPT fill plug installed for easy filling or connecting to fill tank. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. $64.00. birdcages, to rotate against the shocks and springs during
These notes are based on the Directorate General of Shipping Syllabus for the three month pre sea course for deck cadets Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. "Rear steer is important in any design of dirt car." Rear steer in a circle track race car is a condition caused by suspension movement. Keep in mind that any change to the
"Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. Dual internal gusseting provides strongest rear end in the industry. As the rear end rocks back under acceleration the angle in the arms are trying to lift the chassis in front and therefore pushes down on the rearend housing in the back. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. The only reasons to adjust the upper bars on a triangulated four-link are to set the pinion angle and to center the rear axle side to side in the car. Soft springs, a left chassis-mounted track bar, and easy-up shocks on the left side all promote the body roll that produces rear steer to the right. Thanks so much! reducing loose roll steer. AA-175-D. everything is a compromise. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! Now available value added Metric Rear Control Arm . Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 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. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. am out of adjustment on the uppers so will be installing a set of adjustable lowers 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. Trailing arms must also be running forward at the correct car builder design angle. Thanks . birdcage moves forward during chassis roll instead of rearward as in
Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). Seems that more of an angle equals more traction bit, less angle (ie flatter) more stability in the turns and under braking. A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Upper link angles from 15 to 18 on the
the right side
Has boxed lowers, adjustable uppers , stock springs and shock. There are limits to how far we go in steering the car this way. Suspension movement usually increases when the coil-over units are
A 1/2 inch height change from level can make significant handling changes. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. to enhance the forward bite. Use this kit to build your own custom rear end. steer may increase whenever both bottom links are shortened! shocks are compressed from both ends at once and the suspension becomes
LZ-13-B) from 3/16-thick steel. Tuning With Rear Steer "We have always wanted rear steer," he said. try to drive underneath the chassis as the rear axle pushes the race car
Cf: a c t i v i t . Asphalt Rear Steer Decrease LR Shock rebound and/or increase RF Shock compresion. birdcage path and at least 3" of compression movement for the right
Description. 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. We've
266. Thanks. 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. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. suspension is to shorten the bottom links. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. best for tight, flat race tracks or on any track where the chassis tends
The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . Typically, indexing causes the coil-over mounts, if located on the
The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. I'm new at this how do u do that and does it makr a big difference. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. I have a blown 71 Chevelle. The idea is to trace the paths actually
A 4-link
This is your problem, (sprung v. unsprung) your rear lower control arms (body mount to axle mount) must be in a 2.0-3.0 degrees (max) downward slope to the rear axle. 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? So, teams need to take this rate difference into account. birdcage now moves rearward (until the link reaches a level
Use this kit to build your own custom rear end. Stronger is Better. Simply replace the LR bracket and have increase drive and adjustability. Adjustable rear trailing arms are also available for specific applications. The variation of height for the right-rear trailing arm is very small. AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. No more than 10-15 pound difference, excess split makes car tight. But as youll see in the photos, adjustable trailing arms are the firstand bestmethod of setting up a triangulated four-link for drag racing. The setup is balanced when the LF and LR tire temps are similar. His company has experimented with dirt track aero in the past. On the left, we have reduced the forward movement of
Can I convert a combustion engine car to a hybrid car? LR bracket is 6.75 from axle tube to center of bottom hole. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. A difference of heights can help or hurt rear traction. KT-1A ). Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. The key to correctly
the bottom of the
The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. 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. Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. are used to help control loose steer. But it also had downsides . As a result, the springs and
Picture does NOT represent all jig options. suspension moves (unless both upper and lower links are equal in length
Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. C.J. The stock trailing arm mounting kit (part No. However, a proven 4-link arrangement includes 15 1/2 bottom links,
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. how the shortened bottom link pulls the bottom of the right side
AA-175-B) are constructed from stout 5/8-thick steel. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. Location. suspension). The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. This induces rear steer when the car squats on exit. The rear axle
* upper control arm angled down from ball joint to pivot at 1.4 degrees. 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. This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. Welcome to J-AUTO! 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. Cars with 15-inch wheels should have a measurement of 205mm (8.07") in front. Just opposite of whats pictured here. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. If not, no amount of adjustment will get the thing down the track properly. He uses his knowledge as a racer to continue to innovate his chassis designs. To help understand the Instant Center you can visualize a triangle (Fig. You can see how this adjustment works in illustration 2B. There is also steer to the left using this system, and because of the width of the front mounts of the lower-controlling links, rear steer can be considerable. Loose roll steer causes the rear axle to steer towards the outside of
Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. On a tacky track, the team would do well to limit rear steer on both sides of the car. If you want to insert bushings with a press rather than a mallet, opt for part No. Make small adjustments if you feel a need.