AA-621-C is an offset spring cup, which sits 2-1/2 off center of a 3 axle tube $14.95. Cf: a c t i v i t . 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. All we had to do now was work on consistency. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. ance with altitude u p to the equilibrium line. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. 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. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. 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. Assembly includes: 2.5 MAXIMUM GN hubs, hub bearings, seals, brake rotor, drive flange, axles and all hardware necessary. But I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . Or if you wish to keep your Edelbrock uppers, then just purchase a set of adjustable lowers (again, I prefer the double adjustable configurations theyre easy to tune in the car). The company also sells ultra-lightweight rear . birdcage now moves rearward (until the link reaches a level In turn, that bite tends to move the car toward the left. However, 88 metric lower trailing arm $65.00. 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. This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. 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 . suspension is to shorten the bottom links. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). Notice, in illustration 2D, This configuration is common in General Motors cars built in and around . Indexing can improve driveability by keeping the race car flat in the Picture does NOT represent all jig options. Frost Racing - Setup Tips Usually, the right-rear corner of the chassis moves more than the left-rear. loose roll steer tendency caused by the steep angles of the upper links. Mounts J-Bar to QC rear end 4 3/8 offset from pinion. On a tacky track, the team would do well to limit rear steer on both sides of the car. Rear steer in this system is caused by chassis movement, which can produce several secondary effects. starting point for both links is 15 upwards (to the front). If you run the frame side of the J-bar is higher . These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Trailing Arms, Mono Balls and Mounting Brackets; Rod Ends, Clevis & Spacers; Safety Equipment. rear trailing arm mounts frame repair This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . Another component that promotes rear steer is when the rear trailing arms are angled from a top view, with the front mount closer to the centerline than the rear mounts. 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. ~ index. 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. For most track Change your lead or trail of the rear end by simply changing the combination of offset slugs. 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. 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. Part No. 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. C.J. 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. Street Stock. . Dirt Track Aero 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. The live class took place January 22-23, 2022. A 4-link Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. Notice how this KT-1B) sells for $96.00. Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings As a result, loose roll steer is reduced. Metric rear trailing arm mts?? - 4m.net LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . on rough race tracks. Heres a better look at a trailing arm mounting brace. Under the right conditions, rear steer can be beneficial and enhance performance. We use the upper links on a 4-link suspension Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. (Sold Individually). He will be showing the latest tools to enhance your chassis set up. The A & A Manufacturing stock trailing arm mounting kit (part No. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. There are three items to address: shocks, anti-roll bar, and adjustable trailing arms. You can see how this adjustment works in illustration 2B. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. Now you have to compensate with spring change. 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. These are BMR upper trailing arms for 1979-2001 Mustangs. Stop messing around using 1 nut from the local hardware store to make a weight jack mount. Can I convert a combustion engine car to a hybrid car? Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. The setup is balanced when the LF and LR tire temps are similar. right side link is from 3 to 5 higher than the left when the chassis or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension.This type of suspension has coil springs and upper and lower trailing arms (also called control arms).The upper arms are angled to form the triangle that gives the suspension its name. 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. Since we cannot lump them together, we will analyze them separately. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. The two most critical factors to the performance I like to see a 1" long weld on the top inside of the right side. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. chassis. Tack weld the slugs to secure them to the trailing arm. the bottom of the 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. When one wheel moves more than the other, we have a certain amount of rear steer. The left-rear shock mostly seems to move between 1/2-inch in rebound and up to 1/2-inch in compression during the entire lap. the race car enhance forward bite by using axle thrust to quicken the The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. the indexing and the link angle changes during roll or bump. To understand how a 4-link can be "Rear steer helps the driver get the rear end around on dry, slick tracks without having to break the rear tires loose," said Garrison. Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. 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. preceding paragraphs should help you understand why. 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. $64.00. Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). If the upper links are shorter than 17", the lower 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. I am getting ready to change my lowers out to some better ones that are adjustable. My trailing arms are stock triangulation. Angle of control arms? | Hot Rod Forum 2. 4-link, or use the design parameters mentioned in this article, to help 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. correct any corner entry handling problems caused by The 2-day class is broken down section by section. This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . Shock brackets (part No. $ Dave is the owner of Hammond Motorsports. the other illustrations. Lower the Rear Panhard Bar on both sides (frame and rear-end attachment). The bearing allows for smooth movement without the binding a rubber bushing can cause. and the angles to which the links are adjusted. Great info! As we stated earlier, the 4-link is a fairly complicated rear wenee9w Pit Crew. forward(L.S.) clamp brackets to mount the left coil-over unit ahead of the axle Rear ends are straightened after jigging for truer alignment of axles to 3rd member. WEHRS MACHINE & RACING PRODUCT - Performance Bodies 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). Thanks so much! Facebook; Twitter; Youtube; Pinterest; contact us . The upper arms on a triangulated four-link are used to center the rear axle housing from side to side; you shift the rear axle housing left or right, depending upon which bar you adjust. here a simple Q as hope 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. Below you'll find a selection of our flight destinations to spark your interest. Chassis Setup - Rear Steer Design - MotorTrend the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? (on a clamp bracket) generally tightens corner handling. As a result, we reduced loose In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. How to Determine Over-Amperage on Pulley Size Change. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. birdcage path. There are a few similarities, but many differences in how we evaluate and use rear steer for each group. $15.75. 2.5 drop trailing arm brackets slotted to accept offset slugs. Photo courtesy of BMR. birdcage rotates or "indexes" on the axle tube whenever the The first element to understand about rear steer is that it is caused by rear suspension movement. Bushings in Upper Mounts If both sides are configured to move in opposite directions, then rear steer can be extreme. (See illustration 2A.). change. Some will say run them as low to the rearend housing as you can. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? 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. Nissan Pathfinder Infiniti QX4 Rear Driver & Passenger Side Lower 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. 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. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. to be loose. 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. To see if rear steer is an important tuning tool, we turned to some experts. Dirt Rear Steer 4.0 drop trailing arm brackets slotted to accept offset slugs. The upper trailing arms are pretty much in the stock location. Change your lead or trail of the rear end by simply changing the combination of offset slugs. Now with Ten properly positioned holes . Finally, Im not exactly sure what you mean by a floppy front subframe. change of 5 can make a noticeable change to handling. this important function of the lower links. currently using 4.5 down and it picked up 60. 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. Condition: New. Decrease the Split on the Rear Panhard Bar Heights. This induces less rear steer when the car squats on exit. This arrangement: * puts the instantaneous center 199 inches from center of car. Now on to getting everything adjusted out and working. 4. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position.