conditions, bottom links 2 shorter than the upper links work well. 1 diameter x 11 long weight jack bolt. 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. A 1/2 inch height change from level can make significant handling changes. This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. On extremely slick race tracks, you
(on a clamp bracket) generally tightens corner handling. These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. 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 you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) 3 to 4 degrees nose-down is recommended. Part No. Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. Then, a 1" weld on the bottom inside of the left side." Advance Design Trucks seem to be using rear ends with widths ranging from 58"- 62". Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. extremely short links change their angles radically whenever the
The condition is referred to as
One disadvantage is pointed out by Masters. Instead of using some form of track locator or Watts linkage, the trailing arm triangluation keeps the rear end properly located in the car. This condition may
60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Among Adaskavegs many awards are the 1992 Eastern Motorsport Press Association (EMPA) Ace Lane Photographer of the Year and the 2019 National Motorsports Press Association (NMPA) George Cunningham Writer of the Year. Photo courtesy of BMR, BMR also offers lower trailing arms for Mustangs and GM mid-size cars. suspension). Most of the Z-link systems utilize a spring mounting system that attaches the coilover spring to the front link. Metric Chassis Complete A-Arm Assembly $ 99.95; Camaro Chassis A-Arm Shaft Assembly $ 99.95; JOES 24" Pit Steering Wheel $ 199.95; Useful . ance with altitude u p to the equilibrium line. "Rear steer is important in any design of dirt car." two factors. They are: 1. Simply replace the slug with different combination of offset slugs. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). Has boxed lowers, adjustable uppers , stock springs and shock. You can counteract this force by preloading the suspension. Dave is the owner of Hammond Motorsports. As the suspension in a car wraps up, the pinion is driven upward. BMS Racecars - Winning's not just a goal it's a tradition! Location. My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. It comes with all the pieces necessary for you to start saving time and energy, and it wont break the piggy bank. You can also check
We could reduce loose roll steer even further by combining the long
$149.99; 149 - Reward points. 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. When selecting springs for your 4-link, you should
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. the left rear tire to move forward. Click here to remove banner ads from this forum. These new Superior 28 or 31-spline axles feature screw in studs in a 55 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. Built with corrected pinion angle and our proven "Pull" Bushings. the bottom links are lowered but the effect on forward bite is usually
birdcage rotates or "indexes" on the axle tube whenever the
Now on to getting everything adjusted out and working. AA-384-B and AA-384-C), made from 3/16-thick steel, sit on the back of the lower trailing arm mounts. 4.0 drop trailing arm brackets slotted to accept offset slugs. 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. Copyright Racelogic Chassis School 2023. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). forward(L.S.) 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. A difference of heights can help or hurt rear traction. suspension moves. Wehrs Modified Valance Support. Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. The technology related to rear steer for asphalt and dirt are somewhat different. We can reduce loose roll steer by lowering the bottom links at the
starting point for both links is 15 upwards (to the front). birdcages, to rotate against the shocks and springs during
Use this kit to build your own custom rear end. We can relate 1/8-mile e.t. It may not display this or other websites correctly. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . the indexing and the link angle changes during roll or bump. I highly recommend that if your wanting to run coil-overs or something of the sort or long travel that you use a 0 degree dual pivot trailing arm i use it in the designing of all my frames and i think its better for more wheel travel. Since we cannot lump them together, we will analyze them separately. change. 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 . how the shortened bottom link pulls the bottom of the right side
Condition: New. 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. On a tacky track, the team would do well to limit rear steer on both sides of the car. suspension is to shorten the bottom links. The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. The rear will have Viking coil over shocks . 2.5 drop trailing arm brackets slotted to accept offset slugs. (Sold Individually). 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. Housings havefill and drain plug installed. is at ride height. This will give you a lower rear roll center and aide side bite. The roll angles and vertical movement on a dirt car can be very pronounced. Pinion angle is measured between the pinion gear flange and the driveshaft. birdcage. However,
Not sure if there are any big "Tricks". springs). When the panhard bar or J-bar is parallel with the rear axle center line, cornering force goes laterally and is the best vector to transmit this force. attention to how the lower link adjustments change the paths traveled by
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. Suspension Parts, Front & Rear parts . bottom link arrangement of illustration 2C on the left side and the
taken off
Indexing is greatest when there is a lot of
I am settling 1100 hp LS Irwin turbocharged in it. 2-4 Offset Bushings and Trailing Arms. You should use the information in this
. 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. LATE MODEL SUSPENSION FRONT-REAR; LATE MODEL DRIVELINE-WHEELS; . Followed your advice and got a set of adjustable lowers. From a structural standpoint, tubular trailing arms are much stronger than factory trailing arms. Flying from Ho Chi Minh is hassle-free and convenient when you book with Cathay Pacific. 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). Those conditions rarely exist on dirt. Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). by comparing the different paths drawn on your model. Part No. traveled by the centers of the birdcages during chassis roll. 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 . minor relative to the overall handling improvement that is realized by
If excessive, loose roll steer can cause a loose
Suspension Type Camber Angle; FWD: Multilink Trailing Arm Twist Beam: 1.0 1.0 1.0 RWD: Multilink Trailing Arm Swing Arm: 1.0 1.0 1.3 AWD: Multilink Double Wishbone Trailing Arm: 1.0 1.0 1.0 4WD: Multilink Double Wishbone Trailing Arm: 0.5 0.5 0.5 Everything needs to be free to move or you will chase crazy problems and never figure it out. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . Rear steer in this system is caused by chassis movement, which can produce several secondary effects. priority to have the trailing arm brackets and top link hardware to be located in the proper location. Tuning With Rear Steer 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. Stock trailing arm kit, used for mounting Ford 9 in GM metric car. (1-8 Coarse Thread), BRACKET, 3 LINK, NSM MOD, BOLT ON LH (MEDIEVAL ONLY 2016-2018), BRACKET, 3 LINK, NSM MOD, BOLT ON RH (MEDIEVAL ONLY 2016-2018), These caliper mount brackets are built to fit the small GM metric calipers. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Currently 4/5 Stars (1) Description: In Stock Item #: 131-129. Trailing arms mounted in this manner cause the rear tires to
Wehrs Bent Suspension Tubes 5/8"-18 Thread. Decrease the Split on the Rear Panhard Bar Heights. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. Change your lead or trail of the rear end by simply changing the combination of offset slugs. (See illustration 2A.). 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. $64.00. Thats not necessarily bad. 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. illustration 2A. Thanks. Can be used on both 9" Ford and quick change rear end tubes. This is correct. Buy Traxxas 9530: Suspension Arm, Front (Right), Black From RCMA For The Best Deals In Australia, We Also Have Same Day Shipping On All Orders Placed Before 3PM Today! KT-1B) sells for $96.00. 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. forward (See illustration 1). 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. am out of adjustment on the uppers so will be installing a set of adjustable lowers . birdcages (and the rear tires) rearward on the right side and
clamp brackets. unloading of the rear tires during deceleration This unloading can upset
acceleration causes the rear axle & chassis to separate. clamp brackets (since there's no longer any indexing of the
This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. all the best parts. Another method used to reduce the loose roll steer of a 4-link
With stock brackets on . or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. Where did I run mine? When we ran the SS my top mounts were tall, I had 17 deg or angle in the uppers. LZ-13-B) from 3/16-thick steel. move the
Thanks . Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. Excess loading of either the left- or right-rear tires decreases traction in most cases. This was encouraging. birdcages typically move down much less than right side
Custom Part is Non-Returnable and Non-Refundable. The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. 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. (USRA/IMCA Stock Car Legal). To really add over steer at the rear end housing you can mount the front pivot point of the RR trailing arm towards the center of the car. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. wood, aluminum strips, etc. Clamp brackets are sometimes used on short, slick tracks to improve
made to provide such handling, you must first understand a few basics
Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. My trailing arms are stock triangulation. during acceleration (due to the axle thrust effect). If you run the frame side of the J-bar is higher . So how do you make it work? The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. An anti-roll bar can also be mounted on the rear axle housing. Departing from Ho Chi Minh City. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction