Wayne, great article and reiteration how important pinion angle is in a performance vehicle. Our lowering kits come with ubolts and aluminum spacer blocks. Through video motion analysis of a prototype vehicle before and after the proposed design modifications, we rigorously evaluated the effect of the. On most types of rear suspensions the pinion angle is set by changing the length or angle of a trailing link.
What you need is competition engineerings leaf spring traction bars. Rearwheeldrive cars with leaf springs have the same issues as their coilsprung competitors. This climbing of the pinion gear on the ring gear changes the pinion angle and general geometry of the suspension. The typical leaf spring rear suspension will need 57 degrees of negative angle. The bushing orientation in both right and left upper arms must match. While this changes the pinion angle, it also changes the antisquat of the rear suspension which affects forward drive traction. The reason everyone uses 32inch ladder bars is a space consideration. I use a magnetic pinion angle gauge along with some modified yokes that allow me to get front and rear readings then just do the math. With the second pinion i just set the top slide over slightly, put the lathe in reverse and machined the back edge, turned out to be much easier. Naturally, no one likes losing torque after spending so much money and working so hard to create this rotating force. For a comprehensive guide on this entire subject you can visit this link.
The straight scoop on pinion angles buick performance club. They think pinion angle is the angle of the pinion in comparison to the level. Drag race stock suspension, roll bars and roll cages for drag racing. Tuff country traction bars are designed to mount at the ubolt plate on one and the vehicles frame on the other end. Bars shorter than 32 inches tend to rotate the pinion angle excessively, plus they require a front mount that is very close to the ground. A ladder bar or 4link setup is much more rigid and therefore usually only needs 1 3 degrees. Rear leaf spring lowering block kit mancini racing. Buy calvert racing 3400 caltrac leaf spring traction bars 9915 chevy silverado 2wd. Watch detroit speed sales and technical associate, dan oddy, walk you through the steps of setting your pinion angle to maximize the. Adding aftermarket traction control devices often alters the pinion angle drastically and should be compensated for. Always knew the causeeffect, but had never seen it explained so well. Drag racing tech how does pinion angle affect traction and launch. Enjoy the videos and music you love, upload original content, and share it all with friends, family, and the world on youtube.
Traction bars that use links that pivot on each end, rather than being solidly mounted on the axle end, have a better chance for success in the twisties. That movement with parallel traction bars causes a twisting action that tries so rotate the axle housing, like a antiroll bar, but cant so it either bends or breaks the traction bars. Part 1 rear end alignment part 2 pinion angle part 3 preload part 4 antiroll bar part 5 ride height part 6 basic 4link settings. During launches, the pinion angle will move farther up, and its hard on the ujoints and takes more power out. As far as the pinion angle it should be set when loaded against the traction bars, pinion stop, ladder bars, or whatever device you are using to prevent spring wrapup. A ladder bar or 4link setup is much more rigid and therefore usually only needs degrees. Mancini racing also offers kits the 714 axle a body cars. In many cases it causes the spring to deflect or wrap up see figure 3 which increases the change in pinion angle among other things and complicates.
You never want the the rearend setup with positive pinion angle. Hello mr president, put in ladder bar adjustment and you will see a bunch of stuff. All locating devices have a fixed anchor at one end and actually travel through an arc as the unit rises or lowers in its travel. Buy calvert racing 6400 caltrac traction bars falcon 19641965 mustang 19641973. Pinion angle simply refers to the angle of the differentials pinion in relation to the driveshaft. To protect our staff as well as our valued customers our showroom is currently closed, however we are offering parking lot pick up. This is the main cause for the change in pinion angle and why the starting point for setting pinion angle needs to begin at ride height. Having visited many forums and web sites the general consensus for setting up the pinion angle on a traditional setup with the crankshaft center line level or slightly down and the pinion lower than transmission output shaft would be 12 to 2 down in a four bar situation.
For street rod and drag race applications jegs ladder bars are the perfect addition to your rear suspension. Calvert racing 3400 caltrac leaf spring traction bars 99. Polyurethane bushings improve ride, greatly reduce road noise, provide positive stability and corrects misaligned differential pinion angle. But ask 10 guys about optimal pinion angle and a lively debate will ensue. Product tech chris alston explains drag racing suspensions. Operating similar to a fourlink suspension, the forcetransfer link bar transmits forward thrust from the rear axle to a point more toward the center of vehicle mass. Mr gasket 1607 pinion angle shim traction bar wedge kit 4 degree shims. A positive pinion angle is upward, and thats the angle you want to stay away from.
Competition engineering leaf spring traction bar kits. The angle causes all of the rollers to roll properly and not flatten. Motors, secure web site hosting available from albert lea electric co. I had the dave morgan book and went to a seminar he had in memphis but my book has flew the coop later j. The caltrac traction bar system is a bolton upgrade to the rear suspension that is designed to eliminate wheelhop, and maintain pinion angle. This is, after all, the force we use to move the car and no matter which class you run, the name of the game is to move the car. Less complicated and easier to set up than a four link. How to install calvert racing caltracs traction bars. The first picture shows the angle being cut with the top slide swung right round so that the handle was over towards the back of the lathe.
Discussion in the hokey ass message board started by texashardcore. One easy way to tell if a truck needs traction bars is how the rear axle and suspension behaves while on a chassis dyno or, as many have done, throw the gopro under the truck and take a test drive. What happened is you shortened the length of the upper bars and that changed the intersect point, moving the ic farther forward. Caltracs traction bars were developed to achieve specific goals to improve high power traction while staying within hard set nhra parameters. They are then finished with a black powder coat to resist corrosion. On a longwheelbase vehicle like a truck, the 36inch ladder bar may be the best choice. Jegs adjustable ladder bars allows for quick adjustment of pinion angle and preload. Rear suspension overview part 2 pinion angle youtube.
You never want the rearend setup with positive pinion angle. This is when the yoke of the rearend is tilted upward more than the driveshaft. While also permiting the pinion angle to be adjusted. I dont think it is an issue unless you dont use a traction. Your pinion angle may not be 2o, but it must be determined at this time. In fourlink cars, the top bars pull and the lower bars push from this dwt. Lakewood castaluminum traction bar wedge kits allow traction bars to be angled up or down to compensate for weak springs or. If not, then the difference should be split between the two ujoints. Summit partnered with southside machine a name thats widely recognized for drag racing performance to bring you firmer launches at the line. Rear traction bars free delivery possible on eligible purchases. In addition, a leafsprung car has to deal with the issue of spring wrapup. Lakewoods traction bars are engineered for easy bolton installation with no welding required.
Cars using nohop bars or lift bars must have the pinion angle reset to compensate for the change from installing. How to build modern traction bars for a bodies only. Ladder bar racers use it to raise the front rod end against the chassis. Gasket pinion angle shims and more at low everyday. Design and manufacture of an adaptive suspension system a major qualifying project report submitted to the faculty of. Installation instructions 1932 ford rear triangulated 4. The best traction bars for diesel trucks drivingline.
Usually if used as traction device the bars are made pretty short for. Traction bars keep the pinion angle the same no matter the circumstance. Make sure that both brackets are the same distance from the ends of the. They must have a means to set pinion angle, preload, and get the car to. We now offer single side kits to compensate for mopar super. Depending on who you speak to, we lose 10 to 20percent of our torque due to friction losses in the drivetrain. Hes authored five howto books and written over 4,500 tech articles that.
Assemble the upper link bars with the adjusters to the front onto the front brackets and axle tabs. Lakewood 20510 axle shims, traction bar wedge kits, 4 degree, 2. Tuff countrys traction bars help to reduce axle hop and wrap, providing increased traction and acceleration for vehicles with large aftermarket wheels and tires. Installation instructions 1932 ford rear triangulated 4link kit. Calvert racing 6400 caltrac traction bars falcon 19641965. Preload and spring wrapup can be controlled using traction bars or. This type has been used by the originalequipment manufacturers oems at times, such as on the 1967 z28, by shelby on the gt350, and on sunbeam tigers maxs red 1965 tiger. This is where the system emulates a four link system. Slick or very little traction avalable and rubbered up tracks which are dry but the rubber from the tires is adhering to the track. Trailing arms free delivery possible on eligible purchases. They must have a means to set pinion angle, preload, and get the car to launch as fast as possible. Ladder bars will require a lower setting as power increases in the same chassis.
Learn everything you need to know about winning in this handson guide, which features the latest stock car racing chassis and suspension technology. Decreasing the pinion angle requires clockwise rotation. Having said that, you may need a lower hole than you have available in your chassis bracket and may not be able to adjust to maintain an appropriate pinion angle if you. While the stock rear suspension in your ride may be adequate for stock engines and street tires, it just isnt going to cut it when you increase horsepower. This can lead to binding of the ujoints and will hurt traction the real. Pinion angle is also an important part of rear suspension setup, and the ideal pinion angle can vary from application to application. The caltrac traction bar system is a bolton upgrade to the rear suspension that is designed to eliminate wheelhop, and maintain pinion angle during launches. Design and manufacture of an adaptive suspension system. Pit stop usa has everything you need to build a winning race car or street machine and get you to the finish line first. Pinion angle is important due to the forces at work in the rearend and rear. One tip always use the exact same pinion angle gauge at both ends. This can lead to binding of the ujoints and will hurt traction and break.
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