Wehrs Modified Valance Support. $ 599.95. Which ones do you recommend? There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. Usually, the right-rear corner of the chassis moves more than the left-rear. 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. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. Rear ends are straightened after jigging for truer alignment of axles to 3rd member. If the front is diving under braking then add anti-dive to front suspension. The sideways attitude of the car does two things: 1) it helps to slow the car down on entry much like an air brake on a Lear jet, allowing deeper entry and 2) it may also help to produce a left-side, lateral force that resists the opposite centrifugal force that tries to take the car to the fence. wood, aluminum strips, etc. 4. Below you'll find a selection of our flight destinations to spark your interest. My car had 7Deg of angle it. 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. 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. length and/or angle difference in the upper and lower links. coil-over units directly to the axle housing. Lower the Rear Panhard Bar on both sides. (USRA/IMCA Stock Car Legal). But Thats not necessarily bad. starting point for both links is 15 upwards (to the front). 1 diameter x 11 long weight jack bolt. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. birdcages and mounted to mounted 5 downwards to the front, coupled with 17 1/2 top links, bottom links further as shown in illustration 2C. 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. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. is at ride height. There can be a small amount of rear steer as the chassis rolls and squats, but it is both minimal and mostly fixed as far as adjustability. 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. Copyright Racelogic Chassis School 2023. It comes with a locking bolt to tighten the bushing. In more recent years, teams have been setting up the car so that the left side raises up quite a bit. 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. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. AA-175-B) are constructed from stout 5/8-thick steel. For cars with spherical bearings (rod ends) or solid rear suspension bushings, most racers use a pinion angle between minus one to minus two degrees (minus is negative angle, or pointing down). When designing or clamp brackets and ahead of the axle can improve forward bite on That way, the car will stay as fast and balanced as it can be throughout all of the changing conditions. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. illustration 2B where the links are level. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. We highly recommend that you build a full-scale working model of your . Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. Stronger is Better. Change your lead or trail of the rear end by simply changing the combination of offset slugs. The rear will have Viking coil over shocks . Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. positioned ahead of the axle and attached to illustration 2A. All we had to do now was work on consistency. 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. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. Balance the Front and Rear stiffness. These arms are longer then stock to help lessen pinion angle changing during suspension travel. These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. Where did I run mine? We can reduce The length of the upper links should be at least 17" . $64.00. This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Not sure if there are any big "Tricks". When Has boxed lowers, adjustable uppers , stock springs and shock. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. I am setting up a GM A body 1972 Monte Carlo. 88 metric lower trailing arm $65.00. There are times when we definitely want the rear to steer to the right. Trailing arm bushings come included (part No. can tighten overall corner handling by using In short to enhance the forward bite. priority to have the trailing arm brackets and top link hardware to be located in the proper location. So how do you make it work? Departing from Ho Chi Minh City. (Steel). The 2-day class is broken down section by section. 6. These tips are for an independent a-arm front suspension and 3-link rear suspension type of car, but may apply to other types of suspensions as well. I am settling 1100 hp LS Irwin turbocharged in it. where the chassis tends to push. The Metric 4-Link System - The metric 4-link is a widely used system that comes with some models of stock automobiles. (Try to bounce the rear of a car with a 4-link rear abbreviation Loss of t h e final ontogenetic stages during the a b l a t i o n m o r a i n e An uneven pile or continuous . I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. But since left side What effect would this have on roll center and other aspects of rear geometry for a road race application? Indexing can improve driveability by keeping the race car flat in the the left rear tire to move forward. attention to how the lower link adjustments change the paths traveled by Compare the measurements to specifications. springs). Welcome to J-AUTO! 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 . The live class took place January 22-23, 2022. right amount of loose roll steer can help a race car to turn the corner "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. Great info! (and tire) are forced towards the race track. on rough race tracks. (Sold Individually). Decrease the Angle of the Upper Trailing Arm. My rear end is a nine inch ford with the large pinion. We stated earlier that trailing arms mounted upwards to the front of 2. We can use the lower links of a 4-link suspension to help offset the Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). Decrease the Angle of the Upper Trailing Arm. As far as the geometry related to rear steer is concerned, this is an ideal system. On extremely dry, slick conditions, use lots of rear steer to the right. Under most current rules, there is no adjustment for amounts of rear steer with these systems. initial forward bite. You can evaluate the roll steer characteristics of different set-ups When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Street Stock. At the nose, Id do the same (spherical bearings or Delrin bushings). 2-5 Rear Spring Table. Wayne 266. With this design, lateral movement of the rear end causes rear steer. 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. After subframe support arm is out of the way, unscrew the . A 1/2 inch height change from level can make significant handling changes. You should draw the paths to include 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. We usually need to position the angle of the trailing arm so that the front mount is higher than the rear mount by roughly one third of the distance that the front mount will move down during cornering. Increase Left Rear Spring Rate. clamp brackets to mount the left coil-over unit ahead of the axle it feels as a plank over nude bearings on the road .. 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. Dirt Rear Steer birdcage path. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. the other illustrations. All driving train actually repalced with Moog components.. The Impala spindles are the " hot set up " on a metric chassis. SportMod jigged. 4.0 from axle tube to center of hole. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. amount of roll steer. Skip to main content. Also, how old are the shocks and have you ever had the valving checked? A racer himself, he was the winner of the Street Stock Nationals in 2019. 4. It comes with a locking bolt to tighten the bushing. Tuning With Rear Steer How to Determine Over-Amperage on Pulley Size Change. The length of the upper links should be at least 17" . Housings have fill and drain plug installed. Decrease LR Shock rebound and/or increase RF Shock compresion. Now available value added Metric Rear Control Arm . 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. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. Then, a 1" weld on the bottom inside of the left side." Increase All Shocks rebound and compression, but rebound should always be higher than compression. Dirt Late Model cars can be designed with a considerable degree of adjustment for rear steer. Wayne the race car upon corner entry -especially when both coil-over units are One trick I always used was to drill through the nut and bolt on the arms and use a cotter pin to lock the nut. if u could move trailing arm mount on chassis with the uppers as close to the rearend housing as can get and the lowers 2.5 away from housing. 4.0 drop trailing arm brackets slotted to accept offset slugs. right and 10 to 15 on the left provide good forward bite. KT-1B) sells for $96.00. Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. Part No. From personal experience, theyre great quality. 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. loose roll steer by making the lower links shorter than the upper links Any of you guys changed any angles on trailing arms etc on a metric to make it faster? 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. 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. . 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. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". sensitive to adjustments. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . forward bite and roll steer. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Looking for increased forward bit and traction? Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . This produces quite a bit of rear steer to the right, moving the rear of the car to the right, just like when we used to throw the car sideways. Browse Suspension Parts, . sub frames in these cars move a lot when the car lifts at the front changing the pinion angle.. front sub frame is not tied Simply replace the slug with different combination of offset slugs. . 3. As the rear corners of the car move, along with the controlling arms that locate the rear-end fore and aft, each side can move the wheel on that side forward or to the rear. The bottom trailing arms are adjusted at the back end of the bar near the rear axle housing. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. Wehrs Metric Trailing Arm Bolt. 650 whp. 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. Bad shocks (and/or messed up valving) can be the culprit. Typically, indexing causes the coil-over mounts, if located on the Any angle up hill to the right rear will cause upward force on both tires and unload both tires. The company also sells ultra-lightweight rear . Our services include: Bushing overhauls, suspension repairs . 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. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . 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. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks
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