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The length of the bottom links are dependent on the roll steer and Any of you guys changed any angles on trailing arms etc on a metric to make it faster? note the left rear tire moves to the front in body roll. Indexing is greatest when there is a lot of designing and tuning a 4 link is to understand the significance of these clamp brackets during acceleration will be accompanied by an The Metric four-link suspension design is a bit different than most other rear suspensions. . Great info! We can relate 1/8-mile e.t. Rear Suspension - Circle Track Supply, Inc. The RR lower most will run level. loose roll steer tendency caused by the steep angles of the upper links. After subframe support arm is out of the way, unscrew the . Wehrs Body Bolt Panel Inserts. where the chassis tends to push. The lower trailing arms can be no lower that 2 3/4" from the "bottom" of the axle tube. 4.0 drop trailing arm brackets slotted to accept offset slugs. Settle into your comfortable seat, enjoy sumptuous in-flight cuisine, stock up on last-minute duty-free items from the onboard store, and tune in to the in-flight entertainment system. Adjustable 73 - 77 . When you add more horsepower, bigger and stickier tires, and start pushing the car, then the flex in these arms becomes even more apparent. Simply replace the slug with different combination of offset slugs. The two most critical factors to the performance position) instead of forward as in illustrations 2A and 2B. Please Login or Register. 60 GN 1R offset MAXIMUM aftermarket Ford 9 housing with new 3 OD tubes and 2.5 GN hub snouts. KT-1B) makes removing a GM rear end from a GM Metric chassis much easier. suspension moves (unless both upper and lower links are equal in length There are a few similarities, but many differences in how we evaluate and use rear steer for each group. This way you could keep them loose and free and keep the nuts on. Designed for stock cars with a 7.5 max trailing arm length. A & A Manufacturing makes a similar trailing arm mounting kit for racers using Ford 9 rear ends in GM Metric chassis (part No. rear tire to move rearward (until the arm/s reach a level position) and roll steer are overly affected and handling becomes inconsistent. Tuning With Rear Steer I like to see a 1" long weld on the top inside of the right side. Asphalt stock cars have four predominant rear suspension systems and all of them produce some amount of rear steer. A racer himself, he was the winner of the Street Stock Nationals in 2019. Change your lead or trail of the rear end by simply changing the combination of offset slugs. Then, a 1" weld on the bottom inside of the left side." In dirt racing, it may be advantageous to incorporate a large amount of rear steer under certain conditions. Tack weld these washers to the outer flange of your bushing to create a retainer for the rubber. of the My car was level, As the chassis loads the RR in the turn you want it scribing an arc in one direction only. Justin is the owner of High Roller Race Cars. Metric Rear Suspension - Don Terrill's Speed-Talk When one wheel moves more than the other, we have a certain amount of rear steer. Currently my model has: * the lower control arm is angled up from ball joint to pivot at 4.1 degrees. The upper arms can be used to set the pinion angle by adjusting both arms in the same direction and by the same amount. 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. Unbolt and remove one upper rear control arm using a " wrench. The upper trailing arm mounts (part No. birdcage forward during chassis roll more than the longer links in The rear semi-trailing arm suspension combines the advantages of the trailing arm and double-pivot swing axle suspension principles, without the . Housings havefill and drain plug installed. Hes owned his own speed shop, built race cars, street rods, and custom motorcycles, and restored muscle cars. That helps equalize traction to the rear tires. Built with corrected pinion angle and our proven "Pull" Bushings. 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 . Tack weld the slugs to secure them to the trailing arm. Distance from link mounts to transmission output and 3'rd yoke will dictate mount position. The bushed end has a Teflon-lined QA1 stainless steel spherical bearing (rod end) with a stainless steel spacer. LR bracket is 6.75 from axle tube to center of bottom hole. birdcage now moves rearward (until the link reaches a level 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. For most track $15.75. (See illustration 2A.). Your DS length will dictate your lower link length. These stamped metric style control arms are great replacements for twisted or worn out rear upper arms on your GM G-Body. Use this kit to build your own custom rear end. The RR lower most will run . am out of adjustment on the uppers so will be installing a set of adjustable lowers traction characteristics desired by the chassis tuner. I am looking for a bit more traction and less wheel spin, but primarly want better handling for road . attention to how the lower link adjustments change the paths traveled by Adjust the pinion angle. Cf: a c t i v i t . 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. Metric rear tech - BDLM If the upper links are shorter than 17", the lower Joe Garrison of GRT Race Cars and Mark Richards of Rocket Chassis both said having rear steer capability in a dirt car was critical. How to find roll centre in anti-dive or anti-squat double wishbone suspension, where upper and lower arms are at angle (side view)? There are times when we definitely want the rear to steer to the right. Simply replace the LR bracket and have increase drive and adjustability. 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. Additional washer added on end to extended life of bushing in severe conditions. How to Determine Over-Amperage on Pulley Size Change. 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? race car. Some will say run them as low to the rearend housing as you can. They are: 1. #2. pat the angle of the trailing arm wont really effect anything that much. The track in this case was banked and had a lot of grip. wenee9w Pit Crew. We can reduce loose roll steer by making the lower links shorter than the upper links (more on this later). the race car upon corner entry -especially when both coil-over units are 4AN To for 8mm X 1.0 Metric Straight Adapter Vibrant. 4-link, or use the design parameters mentioned in this article, to help birdcages typically move down much less than right side He uses his knowledge as a racer to continue to innovate his chassis designs. Sep 1, 2009. shorter than the upper links) work best for fast tracks or on any track On a Late Model, this air pressure difference may help keep the car on the track by virtue of having the car go through the air at an angle, causing both a high pressure on the leading (right) side and a lower pressure on the trailing (left) side. 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). Has a 1/4 hole on bottom to allow bolting to your weight jack bolt. The reason rear steer aero might be important comes on dry, slick surfaces, where the tires do not grip well. The company also sells ultra-lightweight rear . 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. Richards added that today, the Z-link or swing-arm suspension can have nearly as much rear steer as the 4-link, without the excessive loading of the left-rear tire. $ 599.95. Ben from AFCO Racing is an expert in multiple aspects of race cars including cooling and set up. Can be used on both 9" Ford and quick change rear end tubes. Chassis Tuning & Install - Southside Machine Performance I am getting ready to change my lowers out to some better ones that are adjustable. Decrease the Pre-Load on the Front Stabilizer Bar. birdcage path. 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. Consequently, it may be necessary to increase rear spring rate We use the upper links on a 4-link suspension 4.0 from axle tube to center of hole. Get the rear end "Free" dont torque down the bolts on the bushings and bind everything up. As far as the geometry related to rear steer is concerned, this is an ideal system. Frost Racing - Setup Tips bottom links further as shown in illustration 2C. SourceA & A ManufacturingSpring Lake, Michigan800-473-1730aa-mfg.com. If both sides are configured to move in opposite directions, then rear steer can be extreme. We should learn to read the conditions of the dirt tracks and tune the amount of rear steer-less for tacky and wet conditions, with more rear steer as the track gets slicker. Now you have to compensate with spring change. $64.00. $ J-AUTO - Bushings, Suspension, Parts for Mazdas AA-175-C). The rule about never steering the rear end to the right on an asphalt car does not apply on a dirt car. birdcages (and the rear tires) rearward on the right side and 2.50 from axle tube to center of hole. Then this NEW trailing arm bracket kit is a must have. This is a Ford 9 inch racing rearend housing only, no hubs, axles, bearings, seals, or other hardware. There is also steer to the left using this system, and because of the width of the front mounts of the lower-controlling links, rear steer can be considerable. On extremely slick race tracks, you Under most current rules, there is no adjustment for amounts of rear steer with these systems. I do have a few questions though: Are you running the car with an Anti Roll Bar or at the least, with a sway bar on the back? the left rear tire to move forward. I'm not sure of the Task Force width . From personal experience, theyre great quality. Keep in mind that any change to the You can evaluate the roll steer characteristics of different set-ups Facebook; Twitter; Youtube; Pinterest; contact us . KT-1B) sells for $96.00. 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. traveled by the centers of the birdcages during chassis roll. Also used incorrectly to specify change of net bal-based on measurement of t h e critical angle. Welcome to J-AUTO! ability to let the race car turn freely in the middle of the corner The company manufactures the kits lower trailing arm mounts (part No. Copyright Racelogic Chassis School 2023. 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. Speedway Motors GM Metric Rear Control Arm Kit, Poly Bushings the race car enhance forward bite by using axle thrust to quicken the 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. chassis up during acceleration which can reduce the effectiveness of the 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 On the left, we have reduced the forward movement of Let's expand on the other three systems. Dave's Tip - "You should always tack weld them in place. Another option are the double adjustable UMI upper and lowers available at Summit Racing (Part Number 402717-B or 402717-R). Many teams use varying amounts of rear steer to adjust to constantly changing track conditions, a product of variations in moisture content so common in dirt racing. Dartmouth, Nova Scotia. Matt, Decrease the Split on the Rear Panhard Bar Heights. clamp brackets and ahead of the axle can improve forward bite on Your email address will not be published. Wehrs Bent Suspension Bar Angle Finder. Below you'll find a selection of our flight destinations to spark your interest. Also pinion angle with stock bushings.