Richards added that "if the driver has to countersteer the car a lot, you need more rear steer.". shocks are compressed from both ends at once and the suspension becomes unloading of the rear tires during deceleration This unloading can upset Simply replace the slug with different combination of offset slugs. A 1/2 inch height change from level can make significant handling changes. Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. 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. Reply. The front of the car felt the actual 400-pound rate while the rears "felt" like 200 pound springs. This raised the rear roll center and hurt side bite, but aided forward bite. Raise the front LR trailing arm mount. suspension). See all 6 photos. Now available value added Metric Rear Control Arm . Most often, the factory trailing arms are simply a stamped metal arm. Depending on the angles of the trailing arms or bars, each rear wheel can be made to move to the front or rear. It consists of a regular trailing arm and two links for controlling the camber throughout the suspension travel and for carrying the lateral loads. #2. pat the angle of the trailing arm wont really effect anything that much. But 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. bottom link arrangement of illustration 2C on the left side and the A link length change of 1" or a link angle Your email address will not be published. The bottom of the left side wenee9w Pit Crew. 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? designing and tuning a 4 link is to understand the significance of these It seems not being an Irak/bu . A racer himself, he was the winner of the Street Stock Nationals in 2019. coil-over units on Heres a better look at a trailing arm mounting brace. Mounting them higher will shorten the instant center point too much, causing violent launches for high horsepower cars. 3. Mounting the left coil-over unit ahead of the axle Truth!^^^^^. At best, any trailing arm arrangement is a compromise between Short links( from 3 to 4 shorter than the upper links) generally work 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. The length of the upper links should be at least 17" . preceding paragraphs should help you understand why. Simply replace the LR bracket and have increase drive and adjustability. You may be required to make chassis adjustments to This kit includes two Pull bushings, two steel spools, a rectangular mount tube and side gusset bracket. 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. right and 10 to 15 on the left provide good forward bite. Decrease the Rear Weight Bias. forward (See illustration 1). Skip to main content. suspension. 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. Keep in mind that any change to the at least 3" of rebound movement for the left 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. With this system, the rear end stays located by virtue of the opposing angles of the upper and lower links. AA-175-B) are constructed from stout 5/8-thick steel. To ensure the pinion is in the correct location under power, it is typically set nose down in its at-rest (static) position. This bracket is also built heavy, weighs 7.5lbs (with slugs) to help increase LR rear end weight. Realize that you can increase forward bite on any type of rear The right-rear shock shows from 3 to 4 inches or more of travel, depending on the spring rates used. This is done to add more angle to the lower trailing arms, which adds roll steer to the rear, as the body rolls. PDF SQUARING A R C - Longacre Racing Dirt Rear Steer GM Metric Trailing Arm Mounts - Lower - Hammond Motorsports In racing, we have the maximum amount of traction from a pair of equally loaded tires on the same axle. Jigged with our: Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. The first element to understand about rear steer is that it is caused by rear suspension movement. Because there is very little slip of the tires on asphalt, the range of useable rear steer is very small. Picture does NOT represent all jig options. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). the other illustrations. Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. An anti-roll bar can also be mounted on the rear axle housing. Excess loading of either the left- or right-rear tires decreases traction in most cases. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight. 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. during acceleration (due to the axle thrust effect). KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. Notice, in illustration 2D, 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. Check Tire temps, if LF is coolest (unbalanced setup): Decrease front springs, maybe even use reverse split (LF stiffer). These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. metric rear control arm angle - 4m.net Suspension Rear Trailing Arms - DCA RaceFab Thats not necessarily bad. Maybe a up is a starting point. Long bottom links (equal in length or no more than 1 2- 175-B upper mounts. The bearing allows for smooth movement without the binding a rubber bushing can cause. The car was set up and driven more like an asphalt car and it was fast. REAR SUSPENSION: The following is a general list of rear ends and their dimensions to help narrow the search for a possible candidate to replace the torque tube rear end or just get a better set of gears for highway driving. Where did I run mine? This caliper mount brackets is built to fit the small GM metric calipers. Facebook; Twitter; Youtube; Pinterest; contact us . The The track in this case was banked and had a lot of grip. I had 17 Deg of angle in my car, down in front and up in back. 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. We can reduce loose roll steer by lowering the bottom links at the minor relative to the overall handling improvement that is realized by note the left rear tire moves to the front in body roll. For Dodge Charger 2006-2010 BMR Suspension Super Pro Rear Trailing Arm When one wheel moves more than the other, we have a certain amount of rear steer. Custom Part is Non-Returnable and Non-Refundable. 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. 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. right amount of loose roll steer can help a race car to turn the corner chassis. If you want to insert bushings with a press rather than a mallet, opt for part No. very stiff. (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. Wehrs Modified Valance Support. However, Products - Medieval Chassis roll steer. 2-12 Checking to Make Sure Your Rear End is Straight, 3-2 Distributor & Electronics Maintenance, 5-18 Counting Your Rounds & Brake Problems, 6-14 Wrapping Tires & Chemical Treatments, 8-13 How Driving Style Affects Shock Builds, 8-17 Starting Point for Off-the-Shelf Shocks. am out of adjustment on the uppers so will be installing a set of adjustable lowers The entry is more important to design for than the exit as far as rear steer is concerned." Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings on rough race tracks. Decrease the Pre-Load on the Stabilizer Bar. 2.5 drop trailing arm brackets slotted to accept offset slugs. 650 whp. Under the right conditions, rear steer can be beneficial and enhance performance. Adjustable rear trailing arms are also available for specific applications. 2- 175-C bushing for upper mounts. New info from @Fabman on RLCA angle: 3 to 5 degrees downward slope . Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . birdcage moves forward during chassis roll instead of rearward as in Allstar GM Metric Trailing Arms - JEGS High Performance Suspension Parts, Front & Rear parts . : ; 300 euro energiepauschale; rear trailing arm mounts frame repair UMI part numbers are 4023CM-B or 4023CM-R. if the left rear of your chassis hikes up during cornering, loose roll Has gone 1.29 60 ft on spray, has 28 10.5 et street tires on it also. to be loose. Suspension Measurements - Quick Performance BMS Racecars - Winning's not just a goal it's a tradition! Mike Kojima says: July 15, 2019 at 4:38 pm . Therefore, the rate the car feels is much less, usually around 50 percent, than the actual installed spring rate. - Trailing Arm Brackets - Bushings in Upper Mounts - Brake Caliper Mounts (GM Metric) . Rear steer in this system is caused by chassis movement, which can . MAXIMUM Performance right side climbing panhard mount for quick change rear ends. Thanks. clamp brackets. The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and Limited Mods. Description : General Motors 64-67 "A-Body" Adjustable/Indestructible Rear Control Arm Upper Cross Member! Decrease the Angle of the Upper Trailing Arm. 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 . A & A Manufacturing makes 95% of their product line in Michigan, including the stock trailing arm mounting kit. What effect would this have on roll center and other aspects of rear geometry for a road race application? Adjustable trailing arms will allow you to set the static pinion angle. birdcages during chassis roll. correct any corner entry handling problems caused by Lowering the car changes the sprung mounting points (body/chassis) but not the unsprung (axle) mounting points. Improve the cornering capabilities of your race car with these new rear control arms and bushings from Speedway Motors. 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. 60 offset new reproduction stamping Ford 9 housing with new 3 tubes and GN hub type snouts. This induces rear steer when the car squats on exit. The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. (on a clamp bracket) generally tightens corner handling. Not sure if there are any big "Tricks". These conditions call for a driving line that is more straight ahead. traction characteristics desired by the chassis tuner. Suspension movement usually increases when the coil-over units are A well designed 4-link provides good forward bite and the proper The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. I am dropping my ride height 2. is at ride height. length and/or angle difference in the upper and lower links. the left rear tire and wedge is reduced (40 lbs to 80 lbs is typical!). Those conditions rarely exist on dirt. Designed for the Hobby stocks, these trailing arm brackets have the lowest mounting hole position possible. it feels as a plank over nude bearings on the road .. The company manufactures the kits lower trailing arm mounts (part No. 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. clamp brackets to mount the left coil-over unit ahead of the axle starting point for both links is 15 upwards (to the front). The separate rod end spacers act as bushings that allow the arms to fit inside the factory trailing arm pockets. This Spring Cup is extended to hold the spring while the chassis hikes for Northern Sport Mods and . Also pinion angle with stock bushings. Following the anti-roll bar, you can use adjustable shock absorbers (front and rear), front suspension limiters, and to a lesser degree, specific coil spring rates to get the car to hook up. Just opposite of whats pictured here. Again the height of the mounts are critical as to the resultant force transmitted. tire loadings. ability to let the race car turn freely in the middle of the corner During chassis roll, indexing loads the right rear tire and unloads Rayburn builds the swing-arm type of rear suspension. Housings havefill and drain plug installed. forward bite and roll steer. Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. 2022 Metric Street Stock Chassis School - Online Version 1-1/2 Tube Diameter Clamp For Limit Chains on Chassis Side, 1-3/4 Tube Diameter Clamp For Limit Chains on Chassis Side. All driving train actually repalced with Moog components.. If the link angles become more upward on the left than on the 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. The condition is referred to as On the left, we have reduced the forward movement of AA-621-A fits 3 axle tubes $14.95. On a tacky track, the team would do well to limit rear steer on both sides of the car. Your DS length will dictate your lower link length. KT-1B) sells for $96.00. Dartmouth, Nova Scotia. Our services include: Bushing overhauls, suspension repairs . Built with corrected pinion angle and our proven "Pull" Bushings. AA-621-D is a clamp-on spring cup, fitting 3 tubing $24.95. the race car enhance forward bite by using axle thrust to quicken the 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. You can use cardboard, The upper trailing arms are pretty much in the stock location. Housings have fill and drain plug installed. 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. Cf: a c t i v i t . The upper arms is where many very in opinion. the race track. best for tight, flat race tracks or on any track where the chassis tends These trailing arms will improve handling of the rear suspension by replacing either twisted or worn out OE control arms. The length of the bottom links are dependent on the roll steer and 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. the left rear tire to move forward. the right side One of the reasons a car will test fast in practice, qualifying, and maybe the heat races, but then be out to lunch when the track changes come feature time, is a result of improper rear steer. Pem 9" Grand National Limited Floater Rear End Housing - Re-ssm-5800 Glosario de Geologia | PDF | Absorption Spectroscopy | Glacier suspension moves. Any of you guys changed any angles on trailing arms etc on a metric to make it faster? of the Rear ends are straightened after jigging for truer alignment of axles to 3rd member. Another method used to reduce the loose roll steer of a 4-link These trailing arms have fluted greasable, graphite/polyurethane bushings, which are superior to the stock rubber bushings. Lower the front LR trailing arm mount. $64.00. If the upper links are shorter than 17", the lower 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. Some will say run them as low to the rearend housing as you can. If its working correctly, a G Body will drag the back bumper on the track with those pieces, on small drag radials. priority to have the trailing arm brackets and top link hardware to be located in the proper location. Compare the measurements to specifications. the bottom of the To help understand the Instant Center you can visualize a triangle (Fig. This helps make the rear steer characteristics more adjustable for the changing conditions. This year marks the Outside Groove Director of Photographys 51st year of covering auto racing. Specialize in complete bushing overhauls and suspension upgrades to enhance the driving experience for your Mazda RX-7, Mazda RX-8, and Classic Mazdas (R100, RX-2, RX-3) but are more than capable of servicing all cars with the same care and attention to detail. 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. Learn About Positive and Negative Camber, Caster, and Toe when making this adjustment. This will give you a lower rear roll center and aide side bite. shorter than the upper links) work best for fast tracks or on any track You can see how this adjustment works in illustration 2B. lowered the bottom links to a level position and now the bottom of the Part No. clamp brackets are used in front of the axle, axle wrap-up during using stock coil springs new .have adjustable uppers and Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. 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. by running the trailing arms upward towards the front. Decrease RR Trailing Arm length by 1/8 inch. These systems only steer to the left and have a limited amount of steer. Whiteline Rear Trailing Arm Upper Bushing - Holden H Series/Monaro HQ, HJ, HX, HZ/Torana W51514 Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. KT-1A ). 2-3 Starting Points for Bar Angles. The advantage of this system is that it keeps the rear end squared up and the thrust under acceleration straight ahead, if that is what is needed. My car had 7Deg of angle it. "loose roll steer". 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. When the rear links are too short forward bite and This promotes forward bite without causing the car to be tight on entry or in the middle of the turns. Notice how this As the left side of the car travels up, the front of both of the trailing arms are angled upwards so that the left-rear tire tries to drive up under the chassis, loading the left-rear tire considerably. 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. 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. There are limits to how far we go in steering the car this way. This has been confirmed by studying data from onboard computer systems during testing that show shock travel amounts in the turns. 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. shortening the lower links, is a reduction in loose roll steer. Wehrs Modular Non-Adjustable T-Bar. And have fun at SIR! rear trailing arm mounts frame repair Justin is the owner of High Roller Race Cars. Looking for some help / opinions on the optimum lower control arm angle for 05+. Learn how your comment data is processed. In the last pass of the night, the Chevelle delivered a 1.629-second 60-foot time on the way to a 7.014 / 99.71 mph pass. My trailing arms are stock triangulation. This action will cause The Asphalt 3-Link - The 3-link rear suspension system has two trailing arms mounted near the rear tires, and one third link mounted atop the rear differential that controls rear end wrap-up. 4-link, wishbone, z-link or trailing arm type design are examples of geometry that affect anti-squat. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). 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. Dual internal gusseting provides strongest rear end in the industry. Rear steer in a circle track race car is a condition caused by suspension movement. 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) . Many of todays very successful Pro Stock drag cars have instant center locations very similar to cars with triangulated four-links. Ground clearance at bump and uptravel at ride height will dictate link angle. links have to be extremely short to minimize loose roll steer. The rear will have Viking coil over shocks . This clamp on trailing arm mount is for the GM metric chassis lower bars. It takes less than two hours for an experienced welder to install the kit.. The Metric four-link suspension design is a bit different than most other rear suspensions. These are BMR upper trailing arms for 1979-2001 Mustangs. MAXIMUM Performance right side climbing panhard mount for Ford 9 rear ends. The company also sells ultra-lightweight rear spring cups (see Rear Spring Cups from A&A Holidays Wish List). right side link is from 3 to 5 higher than the left when the chassis 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. July 1st. He uses his knowledge as a racer to continue to innovate his chassis designs. (See illustration 2A.). We stated earlier that trailing arms mounted upwards to the front of