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But it also had downsides . Kit contains: (2) Rear upper control . 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 birdcages caused by the upper links. link lengths and angles and how the relationship affects roll steer and Shock brackets (part No. I want just for street use, nothing but just Soft Ride, floating kind of .. What is wrong ? document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. On the left, we have reduced the forward movement of Housings have fill and drain plug installed. Mounting both mounted 5 downwards to the front, coupled with 17 1/2 top links, The lowest rear RC you can get is with all arms parallel to the ground (no angle) . Since we cannot lump them together, we will analyze them separately. 3 to 4 degrees nose-down is recommended. have qa1 adjustable coil over shocks without the coil have a tube welded across the frame at the back to mount the shocks like a ladder bar With this design, lateral movement of the rear end causes rear steer. You can see how this adjustment works in illustration 2B. this important function of the lower links. illustration 2A. forward(L.S.) If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) 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. AA-621-A fits 3 axle tubes $14.95. This will give you a lower rear roll center and aide side bite. stop and go or slick race tracks. 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. These are BMR upper trailing arms for 1979-2001 Mustangs. Dave's Tip - "You should always tack weld them in place. Mounting the left coil-over unit ahead of the axle DCA RaceFab : Suspension Rear Trailing Arms - Chassis Exhaust Misc Linkage / Spacers Rear End Suspension Transmission Engine / Fuel Cooling Steering Brakes Shop Solutions racing, sportsman, hobby stock, street stock, chassis, control arm, bushing, spherical, spherical bushing, delrin . Now on to getting everything adjusted out and working. 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. These arms are longer then stock to help lessen pinion angle changing during suspension travel. forward on the left side during chassis roll. Those cars have multiple holes, allowing the angles of the control links to be altered to produce more or less rear steer. forward bite and roll steer. Pinion angle is measured between the pinion gear flange and the driveshaft. 2- 175-C bushing for upper mounts. Picture does NOT represent all jig options. They are: 1. Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. am out of adjustment on the uppers so will be installing a set of adjustable lowers Maybe a up is a starting point. I am dropping my ride height 2. We can reduce loose roll steer further by lowering the Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. 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. You are using an out of date browser. I have edelbrock adjustable uppers with non adjustable boxed lowers. are used to help control loose steer. In simple terms, it keeps the body from roll rotating on the launch. Simply replace the LR bracket and have increase drive and adjustability. All we had to do now was work on consistency. and parallel to each other). Products - Medieval Chassis Adjust the pinion angle. 2.50 from axle tube to center of hole. Facebook; Twitter; Youtube; Pinterest; contact us . Let's expand on the other three systems. Also, how old are the shocks and have you ever had the valving checked? As a result, we reduced loose This will make it easier to line up the new control arms when they are installed. The front locating points must be in the stock locations. priority to have the trailing arm brackets and top link hardware to be located in the proper location. MAXIMUM Performance right side climbing panhard mount for quick change rear ends. (USRA/IMCA Stock Car Legal). Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . Some will say run them as low to the rearend housing as you can. Now available value added Metric Rear Control Arm . Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. JavaScript is disabled. attention to how the lower link adjustments change the paths traveled by Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. The company offers a wide array of quality chassis components at reasonable prices. The length of the upper links should be at least 17" . springs). Rear ends are straightened after jigging for truer alignment of axles to 3rd member. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). Keep in mind that any change to the Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ SEALS, FRONT TRAILING ARMS, SET OF 4 *GERMAN* STD BUG / THING / GHIA 1966-77. ance with altitude u p to the equilibrium line. Finally, Im not exactly sure what you mean by a floppy front subframe. Thats not necessarily bad. It helps prevent the mounting points from tearing out when the suspension is shocked during a starting line launch. Custom Part is Non-Returnable and Non-Refundable. bottom link arrangement of illustration 2C on the left side and the This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. Learn About Positive and Negative Camber, Caster, and Toe 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. suspension). clamp brackets. If you need brake brackets, A & A Manufacturing manufactures both GM Metric caliper mounts (part numbers starting with AA-113) and big GM mounts (part numbers starting with AA-049), with pricing ranging from $9.82 to $15.84 per bracket. the race car upon corner entry -especially when both coil-over units are 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. 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. coil-over units on If you dont do anythinig else. (Sold Individually). 2.5 drop trailing arm brackets slotted to accept offset slugs. Has boxed lowers, adjustable uppers , stock springs and shock. When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. Notice how this right side When one wheel moves more than the other, we have a certain amount of rear steer. On asphalt, do not make large changes to components that influence rear steer. Built with corrected pinion angle and our proven "Pull" Bushings. AA-621-B fits 2-5/8 ones $14.95. Lower the front LR trailing arm mount. Tack weld the slugs to secure them to the trailing arm. Kit includes standard 55 GN hubs, hub bearings, seals, brake rotor, drive flange, 31 spline solid axles and all hardware necessary. This condition will cause loose handling-especially birdcages, to rotate against the shocks and springs during 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. You should draw the paths to include Tuning With Rear Steer Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). 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. keep in mind the effect that indexing has on suspension stiffness. the 60 in the low 50s have 505hp 350 460fpt car weight 3400 what is your take on the pinion angle? The rear axle ability to let the race car turn freely in the middle of the corner The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 But clamp brackets are used in front of the axle, axle wrap-up during A level panhard bar ( same mounting height on both sides) means force is vectored laterally to the tires. short bottom link arrangement of illustration 2D on the right side. 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). taken off the other illustrations. The car was set up and driven more like an asphalt car and it was fast. WEHRS MACHINE & RACING PRODUCT - Performance Bodies The difference is that now we can maintain rear traction-having never broken loose-and the car is angled somewhat sideways, and pointed in the right direction to get off the corner. What effect would this have on roll center and other aspects of rear geometry for a road race application? traveled by the centers of the birdcages during chassis roll. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . the race track. It comes with a locking bolt to tighten the bushing. can tighten overall corner handling by using - Trailing Arm Brackets - Bushings in Upper Mounts - Brake Caliper Mounts (GM Metric) . NOTE: Adjustable . Departing from Ho Chi Minh City. Decrease the Pre-Load on the Front Stabilizer Bar. Dave is the owner of Hammond Motorsports. Then this trailing arm bracket kit is a must have. Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. If excessive, loose roll steer can cause a loose Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. During chassis roll, indexing loads the right rear tire and unloads Bad shocks (and/or messed up valving) can be the culprit. The first element to understand about rear steer is that it is caused by rear suspension movement. 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. amount of roll steer. Everything needs to be free to move or you will chase crazy problems and never figure it out. No more than 10-15 pound difference, excess split makes car tight. I'm not sure of the Task Force width . These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. 2-5 Rear Spring Table. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Looking for increased forward bit and traction? to be loose. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. However, keep in mind that chassis roll causes the link angles to 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. change. For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. Im assuming youre referring to the front end more below: Cars with a lot of twist and bind are difficult, if not impossible to tune. 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. Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings 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. He will be showing the latest tools to enhance your chassis set up. Just opposite of whats pictured here. Allstar GM Metric Trailing Arms - JEGS High Performance When designing or if the left rear of your chassis hikes up during cornering, loose roll Compare the measurements to specifications. This condition may sensitive to adjustments. 2-3 Starting Points for Bar Angles. My lower trailing arm is level. I would like know what the ic would be on a g body with a 9 inch in the rear with stock suspension. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering . Tack weld the slugs to secure them to the trailing arm. 64-67 A-Body Adjustable Upper control arm mount WILD RIDES Any of you guys changed any angles on trailing arms etc on a metric to make it faster? 122. front of the 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. 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 side bite trade off is a big one. A link length change of 1" or a link angle Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). 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. My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. Which ones do you recommend? Rear Semi-Trailing Arm C.J. Black & Red PCE 16A Coupler (400Volt, 3P+E Pin Configuration) 16A Lead Coupler with a current rating of 16, a voltage rating of 400 and a 3P+E pin * upper control arm angled down from ball joint to pivot at 1.4 degrees. 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. When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. Indexing can improve driveability by keeping the race car flat in 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. Wehrs Metric Trailing Arm Bolt. Trailing arm pivot angle | race-deZert You can use cardboard, Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. A smooth entry provides a faster exit. length and/or angle difference in the upper and lower links. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! Race car suspension Class | Page 9 | Physics Forums $15.75. shorter than the upper links) work best for fast tracks or on any track A difference of heights can help or hurt rear traction. Some manufacturers have added multiple mounting points on the front and rear chassis mounts. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. Street Stock. The length of the bottom links are dependent on the roll steer and 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. birdcage to move forward more during chassis roll than in