Then this trailing arm bracket kit is a must have. Can I convert a combustion engine car to a hybrid car? Part No. Usually, the right-rear corner of the chassis moves more than the left-rear. They are angled to fit GM Metric chassis and have four holes for racers to adjust their trailing arm position. We can reduce
There are four types of rear suspensions used in most dirt cars that are significant to study regarding rear steer. The roll angles and vertical movement on a dirt car can be very pronounced. correct any corner entry handling problems caused by
Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. clamp brackets. 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. steer may increase whenever both bottom links are shortened! For more than 50 years, A & A Manufacturing has worked closely with racers and chassis fabricators. When designing or
Hotchkis and Global West make similar control arms for Mustangs and GM A- and G-bodies. Dave here in Saskatoon been racing a g body for many years now and struggle to get If not, no amount of adjustment will get the thing down the track properly. using stock coil springs new .have adjustable uppers and suspension bump (compression) movement. As the suspension in a car wraps up, the pinion is driven upward. Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". forward (See illustration 1). Under the wrong conditions, it can ruin your handling. You can Watch, Rewind, and Watch Again. Thanks . The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. birdcage moves forward during chassis roll instead of rearward as in
AA-175-D. The adjuster is at the front of the bar. A 1/2 inch height change from level can make significant handling changes. 2.5 drop trailing arm brackets slotted to accept offset slugs. My upper a arm is at a 10 degree angle pointing down towards the front. ance with altitude u p to the equilibrium line. In a high horsepower car, engine torque tends to rotate the car so the right rear tire has more bite. The bars can be mounted on one side of the car so that only that wheel moves to create the rear steer. 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. Notice how this
This is correct. 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. Made out of 1/2 thick steel to gain extra LR weight. Thanks. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. Mounts J-Bar to QC rear end 4 3/8 offset from pinion. Dual internal gusseting provides strongest rear end in the industry. With stock brackets on . Housings have fill and drain plug installed. It seems not being an Irak/bu . 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. Decrease the Split on the Rear Panhard Bar Heights. This will make it easier to line up the new control arms when they are installed. Perfect for the guys that already have or Extreme or Xtrmer Drop brackets. change. clamp brackets to mount the left coil-over unit ahead of the axle
I was looking for more info on stock rear 4 link trailing arm angles. Where did I run mine? Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. Suspension movement usually increases when the coil-over units are
The live class took place January 22-23, 2022. AA-621-A fits 3 axle tubes $14.95. Simply replace the slug with different combination of offset slugs. very stiff. The content was subject to approval of A & A Manufacturing. right and 10 to 15 on the left provide good forward bite. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks The length of the upper links should be at least 17" . and parallel to each other). Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. The company manufactures the kits lower trailing arm mounts (part No. RAceman. This trailing arm bracket use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. Description. The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. Add a good weld-on ARB out back. 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. If the car has OEM style rubber suspension bushings, a pinion angle of minus three to minus four degrees is more appropriate. shortened bottom link. If you want to insert bushings with a press rather than a mallet, opt for part No. Adjust the length of the control arms as needed to achieve the desired pinion angle. 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. On a tacky track, the team would do well to limit rear steer on both sides of the car. Wayne Its on a car that Im helping with. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. The rear axle
With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. loose roll steer tendency caused by the steep angles of the upper links. A difference of heights can help or hurt rear traction. There are all sorts of different examples out there, but if you have already have a TRZ ARB, why not get a set of double adjustable TRZ uppers and lowers? Also pinion angle with stock bushings. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? the bottom links are lowered but the effect on forward bite is usually
Ask me how I knowL-O-L. Hope that gets you sorted out. Some will say run them as low to the rearend housing as you can. . Indexing is greatest when there is a lot of
Therefore, the rate the car feels is much less, usually around 50 percent, than the actual installed spring rate. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. (Steel). Great info! BMS Racecars - Winning's not just a goal it's a tradition! Preload is another tuning tool to counteract body roll rotation. However,
The 4-link is a relatively complex rear suspension that is very
tuning a 4-link, it is important to understand the relationship between
Cars with 15-inch wheels should have a measurement of 205mm (8.07") in front. Cf: a c t i v i t . Adjustable trailing arms will allow you to set the static pinion angle. The difference is, Id like to use the center post where the three link top link currently attaches to the chassis, and go out to brackets at the ends of the rear axle. Truth!^^^^^. The upper trailing arm mounts (part No. Keith Masters of MasterSbilt Race Car Chassis said, "The reason chassis builders build 4-bar cars is because of rear steer. Semi-trailing arm suspension, handling and stability performance, non-linear vehicle model, Bees algorithm Date received: 17 November 2011; accepted: 3 February 2012 Introduction Your DS length will dictate your lower link length. how the shortened bottom link pulls the bottom of the right side
Rayburn builds the swing-arm type of rear suspension. I have a blown 71 Chevelle. chassis. Keep in mind that trailing arm angles can become
Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Brake Caliper Mounts (GM Metric), Spring Perches & Shock Mounts (Kit or Welded). positioned ahead of the axle and attached to
You should keep in mind that any loading of the rear tires caused by
Upper link angles from 15 to 18 on the
Photo courtesy of BMR. 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). 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. It takes less than two hours for an experienced welder to install the kit.. mounted 5 downwards to the front, coupled with 17 1/2 top links,
You should use the information in this
$15.75. 2-3 Starting Points for Bar Angles. clamp brackets during acceleration will be accompanied by an
When selecting springs for your 4-link, you should
The trailing arm side will be rusty and wont remove easily, I had to unscrew mine with a 3' breaker bar! 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. 1-15 How Important is it to Bump the Left Front? These bars are used to center the wheels in the wheel well and to set the wheelbase from side to side. 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 . Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. about rear suspensions. The
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. If you run the frame side of the J-bar is higher . 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. KT-1A ). (Steel). A good
To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. handling condition that negates the benefits of the forward bite gained
The Metric four-link suspension design is a bit different than most other rear suspensions. suspension by angling the trailing arms upward toward the front of the
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. But since left side
the race car enhance forward bite by using axle thrust to quicken the
The two most critical factors to the performance
can tighten overall corner handling by using
SportMod jigged. Dave's Tip - "You should always tack weld them in place. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . Adaskaveg got his start working for track photographer Lloyd Burnham at Connecticuts Stafford Motor Speedway in 1970. 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 . My lower trailing arm is level. We use the upper links on a 4-link suspension
SKU: 64-67ABox. Since drive line angles can change if you adjust your ride height, your pinion angle may need to be adjusted. Putting the stock "W" style suspension into a bind is your biggest enemy. suspension. Decrease LR Shock rebound and/or increase RF Shock compresion. Be aware that trailing arms angled uphill too steeply can hold the
. 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. If the front is diving under braking then add anti-dive to front suspension. acceleration causes the rear axle & chassis to separate. Designed for stock cars with a 7.5 max trailing arm length. Performance Disc Brake . to be loose. This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. Heres a look at an adjustable upper trailing arm fitted to a GM G-body. Reply. 9-5 Upper A-Arm Mounting Points Metric. This induces less rear steer when the car squats on exit. Simply replace the slug with different combination of offset slugs. gained by running the trailing arms upward to the front of the race car. 4. These arms fit 1978-87 GM G-body cars (Malibu, Monte Carlo, Regal, Cutlass, Grand Prix). Dirt Track Aero For a better experience, please enable JavaScript in your browser before proceeding. Used on millions of cars - BMW, Mercedes, Ford and even Rolls Royce - semi-trailing arm rear suspension had some huge advantages. We can reduce loose roll steer by lowering the bottom links at the
Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. Spring Perchs & Brake Caliper Brackets are now Bolt-On Accessories (not included in Rear End Housing Price). everything is a compromise. tire loadings. 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. The length of the upper links should be at least 17" . birdcage. the right side
4.0 drop trailing arm brackets slotted to accept offset slugs. forward bite and roll steer. Tack weld the slugs to secure them to the trailing arm. You should draw the paths to include
excessive if the rear of the chassis lifts a lot during acceleration. West Coast Metric - Suspension Parts, Front & Rear. Oct 12, 2013 #2. Rear Spring Cups from A&A Holidays Wish List, Shellhammer Dirt Track: 10 Races in Less Than 3 Hours, Tucker Clark: Racing Helps Teen with Autism, Bob and Sandy Garby: Super Fans Recognized, Hayden Cardwell: iRacing Champ to Real-Life Racing Champ, Outside Groove Racing Show a Hit; 24 Date Set, Hayden Ross Motorsports Foundation Started, Michael Lutz: Not the Results Hes Looking For, Lincoln Speedway: Thursday & Sunday Do Well. shortening the lower links, is a reduction in loose roll steer. You can counteract this force by preloading the suspension. It has been a practice for teams to align the rear end-and/or have it steer slightly to the right-to fix a tight mid-corner condition, but this goes into the category of crutches, and should not be necessary if the car is set up properly otherwise. The popularity of the 4-link suspension is due primarily to its
That saved the factory some money. . Characteristics of the metric 4-link, one of those four, are the same as discussed under the heading related to asphalt cars. $64.00. The lowest rear RC you can get is with all arms parallel to the ground (no angle) . This produces a motion ratio that causes the spring to move less than the chassis per degree of roll and/or inch of squat. roll steer. 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. traction characteristics desired by the chassis tuner. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! 4.0 from axle tube to center of hole. Unbolt and remove one upper rear control arm using a " wrench. the indexing and the link angle changes during roll or bump. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. birdcage does lose some of its rearward movement because of the
Change your lead or trail of the rear end by simply changing the combination of offset slugs. Street Stock. In turn, that bite tends to move the car toward the left. Housings havefill and drain plug installed. keep in mind the effect that indexing has on suspension stiffness. stop and go or slick race tracks. 60 MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. LR bracket is 6.75 from axle tube to center of bottom hole. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. I had 17 Deg of angle in my car, down in front and up in back. This way you could keep them loose and free and keep the nuts on. right side
Click here to remove banner ads from this forum. 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. Rear steer in this system is caused by chassis movement, which can . short bottom link arrangement of illustration 2D on the right side. My trailing arms are stock triangulation. springs). 2-5 Rear Spring Table. Make small adjustments if you feel a need. Owner-operator at Race Products Inc. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. Since then, hes been a columnist, writer, and photographer, in racing and in mainstream media, for several outlets, including the Journal Inquirer, Boston Herald, Stock Car Racing, and Speedway Illustrated. Use this kit to build your own custom rear end. There can be a handling trade-off, however, to the forward traction
This kit is affordable for most street stock racers, and it is both easy-to-install and easy-to-use, Nolff said. 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. 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 . 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. Hes authored five how-to books and written over 4,500 tech articles that have appeared in sixty different high performance automotive, motorcycle and aviation magazines worldwide. If you have a Fox-body or SN95 Mustang, a 1980s GM G-body (Grand National, Malibu, El Camino, etc.) Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. Under most current rules, there is no adjustment for amounts of rear steer with these systems. Mounting the left coil-over unit ahead of the axle
There are a few similarities, but many differences in how we evaluate and use rear steer for each group. Phone (07) 31033011 Between - 9:30am - 4:30pm. My car had 7Deg of angle it. Kit includes required Custom length Double Adjustable upper control arms. all the best parts. . 4. 2,224. 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. 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 . We can use the lower links of a 4-link suspension to help offset the
UMI part numbers are 4023CM-B or 4023CM-R. Suspension Parts, Front & Rear parts . The RR lower most will run . you will speed up your learning process by working with a model. Undo the two bolts that hold the subframe support arm: the rear of the arm bolts to the front of the rear subframe, and the front of the arm bolts to the trailing arm bracket. 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. Other teams may just stick with a fixed location for the mounts in the rear end and adjust handling with other means. two factors. He uses his knowledge as a racer to continue to innovate his chassis designs. 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. The 2-day class is broken down section by section. 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. efforts, will provide you with an advantage. And have fun at SIR! Wehrs Metric Trailing Arm Bolt. made to provide such handling, you must first understand a few basics
Can be used on both 9" Ford and quick change rear end tubes. See all 6 photos. length and/or angle difference in the upper and lower links. Suspension Division. His company has experimented with dirt track aero in the past. Now available value added Metric Rear Control Arm . it feels as a plank over nude bearings on the road .. Raise the front LR trailing arm mount. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). 2- 175-B upper mounts. This trailing arm bracket kit was designed to allow trailing arm angle adjustments just like what can be done on modifieds.. (Sold as a Pair) . 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 . of a 4 link suspension are the link lengths designed into the suspension
. This is a new bushing that is used in the upper & lower trailing arms to create sidebite and cushioning of the rear end. loading of the rear tires. adjustment, positioning the lower links 5downhill, causes the bottom of
On most flat- to medium-banked tracks, the left-rear moves very little. Tack weld the slugs to secure them to the trailing arm. Thats not necessarily bad. One of the things we have done, is to raise the rear ride height. "loose roll steer". bottom link arrangement of illustration 2C on the left side and the
AC A/C Compressor for Honda Civic L4 1.6L 1.5L 1994-2000 & CR-V 2.0L 97-01. Welcome Guest. These conditions call for a driving line that is more straight ahead. birdcages caused by the upper links. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. or something like an early Chevelle or a GTO, it has a triangulated four-link rear suspension. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. note the left rear tire moves to the front in body roll. Wehrs Modified Valance Support. you to better understand the 4-link suspension. Decrease the Pre-Load on the Front Stabilizer Bar. 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. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. We hope the information in this article, combined with your
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. Tuning With Rear Steer This will give you a lower rear roll center and aide side bite. 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. coil-over units directly to the axle housing. Insane video on the induced rear roll over steer. Then this NEW trailing arm bracket kit is a must have. Kit contains: (2) Rear upper control . conditions, bottom links 2 shorter than the upper links work well. For example, in illustration 2A, both the top and the 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. You can see how this adjustment works in illustration 2B. 87 Chevy C10 upper control arms. These new Currie 31-spline axles feature press in studs in a 54 3/4 wheel bolt pattern, , thick heavy duty bearing retainer plates, and tapered wheel bearings pressed on. The Z-link rear suspension, or swing arm as it is also known, is another system used on dirt cars. Welcome to J-AUTO! Stock trailing arm kit, used for mounting Ford 9 in GM metric car. Long bottom links (equal in length or no more than 1
The Truck-Arm System - The truck-arm system has been adapted from the design for a 1964 Chevy truck, and is used on many Late Model Stock cars, as well as the three premier divisions of NASCAR (Craftsman Trucks, Busch, and Winston Cup). amount of roll steer. when making this adjustment. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . These stamped metric style control arms are great replacements for twisted or worn out control arms on your GM G-Body. birdcages (and the rear tires) rearward on the right side and
Stop messing around using 1 nut from the local hardware store to make a weight jack mount. Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. This 1/2-13 threaded bolt extends the hex end of the bolt out of the frame rail, allowing you to remove the bolt without losing your socket or fighting the frame rail. Get your shocks addressed (tested by someone with a shock dyno who knows what theyre doing) and then go back and work on the pinion angle, using the guidelines from the article. Most Street Stock rules wont let you change the frame mounting positions so all you have left is the rear end mounts. 2- 175-C bushing for upper mounts. this important function of the lower links. Now you have to compensate with spring change. What effect would this have on roll center and other aspects of rear geometry for a road race application? For example, you want the top link to be perpendicular to the rear end housing and parallel to the car. This clamp on trailing arm mount is for the GM metric chassis lower bars. There are reports from the past of a team winning a race using four 400-pound springs on a Z-link type of car. On asphalt, do not make large changes to components that influence rear steer. As a result, we reduced loose
Pinion angle is measured between the pinion gear flange and the driveshaft. Under the right conditions, rear steer can be beneficial and enhance performance. The bottom of the left side
A drag race style anti-roll bar is a key ingredient to making your triangulated four-link work. Remove only one control arm at a time. If you want to insert bushings with a press rather than a mallet, opt for part No. 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. correctly. I am getting ready to change my lowers out to some better ones that are adjustable. I'm new at this how do u do that and does it makr a big difference. right amount of loose roll steer can help a race car to turn the corner
(and tire) are forced towards the race track. Their offerings include rod ends, spacers, bushings, clamps, brackets, and mounting hardware for a number of items, from shocks, to brakes, to fuel cells. However, the
As a result, loose roll steer is reduced. Adjust the pinion angle. This is accomplished by causing the right-rear wheel to move back and the left-rear wheel to move forward as the car rolls. 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. Part No. 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. #2. pat the angle of the trailing arm wont really effect anything that much. Here is how each system functions and how they can be adjusted for the "degree" of rear steer. How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)?
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