Truth!^^^^^. That helps equalize traction to the rear tires. The roll angles and vertical movement on a dirt car can be very pronounced. The Ultimate Guide to Suspension and Handling: Part 9 It's - MotoIQ Panhard bar mount used on chassis side of Medieval/Devilbiss modifieds and sport mods. 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. This was encouraging. 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. Allstar GM Metric Trailing Arms - JEGS High Performance There can be a handling trade-off, however, to the forward traction shocks and springs. 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. (on a clamp bracket) generally tightens corner handling. just ordered the adjustable lowers The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . The stock trailing arm mounting kit (part No. I use the H&R parts stuff anti roll bar KT-1B) sells for $96.00. My trailing arms are stock triangulation. Avoid these types of trailing arms for drag racing. The left-rear suspension is designed so that when that corner raises up, the arms are angled, pulling the left-rear wheel forward towards the driver. Changes in the height of the front of the trailing arm as small as a 1/4-inch can be felt by the driver. 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. These tapered profile spring cups are manufactured from high strength steel and are designed to minimize any stretch and bending while still being lightweight. Chassis Tuning & Install - Southside Machine Performance Up To 50% Off Prices EveryDay! Keep in mind that trailing arm angles can become Leaf-Spring Systems - The leaf-spring rear suspension system locates the rear-end fore and aft, as well as laterally using the leafs. 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 #2. pat the angle of the trailing arm wont really effect anything that much. In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. Justin is the owner of High Roller Race Cars. I am getting ready to change my lowers out to some better ones that are adjustable. very stiff. (PDF) Optimization of semi-trailing arm suspension for improving on rough race tracks. I hear of 305 cid stockers running in the high 1.40s far less hp I have adjustable qa1 shocks Trailing arms mounted in this manner cause the rear tires to Race car suspension Class | Page 47 - physicsforums.com This action will cause Now on to getting everything adjusted out and working. This induces less rear steer when the car squats on exit. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. Unbolt and remove one upper rear control arm using a " wrench. The rear will have Viking coil over shocks . initial forward bite. One of the things we have done, is to raise the rear ride height. Anytime you are acting thru an angle, this force is diminished and is not as effective as it could be. 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. "loose roll steer". Decrease the Pre-Load on the Stabilizer Bar. Consequently, a further reduction in loose roll steer results. Most will run the LR angled down in the back. 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. Show more About this course $299.00; 160 lessons . It comes with a locking bolt to tighten the bushing. chassis up during acceleration which can reduce the effectiveness of the Shock brackets (part No. In short sensitive to adjustments. currently using 4.5 down and it picked up 60. On the left, we have reduced the forward movement of 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. UMI part numbers are 4023CM-B or 4023CM-R. We can reduce loose roll steer by lowering the bottom links at the 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. all the best parts. However, a proven 4-link arrangement includes 15 1/2 bottom links, Excess loading of either the left- or right-rear tires decreases traction in most cases. Your email address will not be published. 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? 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. His company has experimented with dirt track aero in the past. and the right coil-over unit behind the axle. But since left side If the Panhard bar is mounted on the right side of the chassis and level to the ground, the rear end will be pulled to the right, and will steer to the left when the chassis moves during cornering. if the left rear of your chassis hikes up during cornering, loose roll document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. 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. Reply. bottom link arrangement of illustration 2C on the left side and the I want just for street use, nothing but just Soft Ride. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. Posts: 5 Metric Rear suspension tricks Dec 31, 2012 20:24:48 GMT -6 . 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. Tuning With Rear Steer The trailing arms can be mounted parallel to the centerline of the car, or angled with the front mounts closer to centerline. See the text for more information. Mounts J-Bar to 9 third-member 4 3/8 offset from pinion. "High left-rear loading does not increase traction," he said. The asphalt racing surface provides a lot of traction, even on those flat "slick" tracks. Semi trailing arm suspension explained - YouTube On most flat- to medium-banked tracks, the left-rear moves very little. When Preload is another tuning tool to counteract body roll rotation. That can work for a mild street or bracket car, but will make a high-horsepower car react violently at launch. right side link is from 3 to 5 higher than the left when the chassis Specifically designed to increase LR drive off the corner and corner entry adjustability with multiple hole adjustments on the RR. and the angles to which the links are adjusted. Rear steer amounts-due to the Panhard bar angle-are regulated by the angle. right and 10 to 15 on the left provide good forward bite. Condition: New. 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. 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. PCE - 16a 400v 3p+e IP44 Black & Red Trailing - Female Socket This clamp on trailing arm mount is for the GM metric chassis lower bars. Decrease the Rear Weight Bias. 2.50 from axle tube to center of hole. My lower trailing arm is level. 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. At the nose, Id do the same (spherical bearings or Delrin bushings). LZ-13-B) from 3/16-thick steel. adjustment, positioning the lower links 5downhill, causes the bottom of 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. Any angle up hill to the right rear will cause upward force on both tires and unload both tires. With stock brackets on . minor relative to the overall handling improvement that is realized by Adjust the pinion angle. But Add to cart Details. Adjustable lower bars are used to center the tires front to back in the wheel well and to make small wheelbase changes. I am dropping my ride height 2. 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 . This induces rear steer when the car squats on exit. In the past, drivers would set up the car for exit off the corners, throwing the car sideways by breaking the rear tires loose. In order to keep the driveshaft and U-joints operating in a (more or less) straight line when youre on the throttle, the pinion angle has to be correct. PDF BMS Racecars - Winning's not just a goal it's a tradition! PDF Design Analysis and Fabrication of Rear Suspension System 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. Tack weld the slugs to secure them to the trailing arm. 2-4 Offset Bushings and Trailing Arms. the other illustrations. ance with altitude u p to the equilibrium line. We can reduce Simply replace the LR bracket and have increase drive and adjustability. (Sold Individually). Keep in mind that trailing arm angles can become excessive if the rear of the chassis lifts a lot during acceleration. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. springs). Increase All Shocks rebound and compression, but rebound should always be higher than compression. suspension. The setup is balanced when the LF and LR tire temps are similar. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. A well designed 4-link provides good forward bite and the proper An anti-roll (or anti-sway) bar is most often used to preload a triangulated four-link. That saved the factory some money. You can play with all of these a little to work on plunge/roll steer. suspension bump (compression) movement. (USRA/IMCA Stock Car Legal). As a result, loose roll steer is reduced. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. "Rear steer definitely helps get into the corners on dry, slick tracks," Goddard said, "but you can put too much rear steer into the rear suspension. Also has a anti roll bar added to it. length and/or angle difference in the upper and lower links. on rough race tracks. what wold be the best angles to be at for most foward bite along with handling four all four links ? (and tire) are forced towards the race track. change of 5 can make a noticeable change to handling. Simply replace the slug with different combination of offset slugs. during acceleration (due to the axle thrust effect). Another method used to reduce the loose roll steer of a 4-link You should draw the paths to include [3] Advantages of Trailing Arm with Camber Links forward (See illustration 1). Speedway Stamped GM Metric Upper Rear Control Arm 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant Use this kit to build your own custom rear end. These trailing arm brackets use common offset slugs (sold separately) to allow you to change the amount of lead or trail in the rear end. I had 17 Deg of angle in my car, down in front and up in back. On cars with triangulated upper control arms, you cant set preload with adjustable arms. Wehrs Bent Suspension Bar Angle Finder. made to provide such handling, you must first understand a few basics During chassis roll, indexing loads the right rear tire and unloads Rear steer in a circle track race car is a condition caused by suspension movement. Upper link angles from 15 to 18 on the Dave is the owner of Hammond Motorsports. This bracket is also built heavy, weigh 7.5lbs (with slugs) to help increase LR rear end weight.