I run 3 wheel brakes about four rounds off the rear but I want to run 4 wheel to let the suspension turn the car in but the car is too tight on entry. When reviewing my data I noticed I have over a 20 lb spread on the rear bite … For dirt cars, the terminology is a little different. Go to YouTube and look up a slow-motion video of a drag race car leaving the line and watch the left rear tire. google_ad_slot = "8270298437"; The Dirt Forum for More Information. Filed Under: Auto Racing Strategy, dirt racing technology, General Auto Racing, Racing Tires Tagged With: dirt late model traction, four link technology, left rear axle weight, slip ratio, traction circle, My books, dirt racing shocks, weight, and spring stiffness I havenât blogged on Hogan Technologies consistently for a couple of years now, but Iâm having fun with it. Could we fill the left rear axle tube with lead while first inserting a steel liner just big enough to give clearance for the axle? The Pros know and live the basics to keep them fast as our sport evolves. Another good way to keep track of traction is by keeping tire pressure records (although staying away from mud before a reading applies here too). Now letâs think about rotating weight. google_ad_width = 728; Clicking on the image below will take you to Amazon where you can grab a copy. a. If the driveshaft was angled upward from the rear end (it would be rare to find one that isn’t), and the rear is pointed, just add the two angles you measured. When I first became aware of it around the middle to the end of last year, my first reaction was âincrease unsprung weight? Bite tells us how much we are favoring the left rear … This will help increase traction on the right rear as well. I heard people are also putting on hubs filled with lead or solid brake rotors. (Tightening the right rear jacking bolt has the opposite effect – it loosens the car.) The second term is more complicated. If the car feels like it is more on top of the track rather than down in the track. Spring rates handle the transfer of weight and the speed at which the weight is transferred. As for stock arms they worked just fine ,and didn't cost anything. In most cases the driver will report only the loose condition at exit, the last bad thing that he remembers, when the cause of the exit problem is actually the excessively tight handling condition at corner entry . Now, picture the thrust from the rearend to the right or left of this centerline. In my last article, I talked a lot about the left rear axle weight which is the hot thing now in dirt racing. My left rear is something like 150lbs heavier than the right rear, with both fronts even at ~740lbs each on a 2425lb FWD car. The same thing happens on the left rear of our car. Rear steer also affects the way a car handles coming out of the corner under hard acceleration. That forces the left rear tire down harder against the track, increasing its traction and thus reducing oversteer. Then I sat back and started to break things down and understand what was actually going on here. These are the “I wish I knew then what I know now” type of things. When the suspension hit its limit, the centripetal force of the spin of the tire will start to expand and the stretch of the tire will be released and begin to lose traction. Use a softer rear axle. Since we are running a beam axle in the rear, weight is free to move across the rear axle. Youâve got to be kidding me!â. We are allowed to run a nine inch rear-end, with the top mounting points no higher than 7 3/4" from the "centerline" of the axle. So, by increasing left side weight, your car will lose traction as well as side bite. This is my second book and it is actually geared toward getting you up and running in the hobby of auto racing. I still donât recommend this for other racing classes where you donât run a chain. In past years, the drivers on dry-slick tracks needed to throw the car sideways in the turns and, in the process, break the rear tires loose in order to point the … Setting the rear end front to back – Start by setting the 2 lower 4 link bars at 14” center to center of the rod end and the uppers at 16” center to center of rod ends (use rear … Iâll let you know right now, Iâm not a fan of increasing the rotating mass of the left rear just to increase left rear axle weight. But, will help hold traction in the left rear when the limiting chain snaps tight. So, if you have "backed it into the corner" and are driving through the turn with the throttle, then the loading on each rear tire will have a large effect on how the race car handles. It is keeping more weight on the left rear resulting in a tighter car. I run 110 pounds of bite on the left rear, will it be too much to try 150? We have been spending a ton of money on lighter components just to get the unsprung weight to a minimum. We're running about 150# LR with 12# right side, 8# left side and around 59% rear. We use cookies to ensure that we give you the best experience on our website. Too little wedge and the car can be tight into, too much side bite on the right rear tire, and through the middle of the corner and loose off the corner. Stagger does very little at any point where the wheels are sliding, where stagger will make a difference is in steady state cornering, typically on dirt this is in the middle of the corner. It is sometimes called the pan-hard bar and is located on the rear of the racecar. This will still allow the sprung weight mass to … I go over all of this in my racing secrets book where I explain slip ratio. Now, letâs think about the fact that some of the weight will transfer across the rear axle as well. Larry Shaw Race Cars Recomended Tuning Guidelines And ... to your race car. The added axle weight will slow the release of the stretch in the tire and help hold traction longer. The roll left screws will affect the car on corner entry or when the car is winged down, the roll right screws will affect the car on corner exit or when the car is rolled right. On flat track: Less rear percentage More left side percentage On Increase nose weightbanked track: More rear percentage Less left side percentage This covers much of the basic knowledge often overlooked by people as our sport gets more complicated. I know some of the more experienced racers are probably saying this is crazy because for years we have been concentrating on limiting the unsprung weight. This will still allow the sprung weight mass to move around the same. This also opens up an entire other facet of slowing acceleration and slowing the effects of the braking system. Having the rear end squared in the car is very critical. I run a metric chassis on dirt ovals. Check out my other blog. The Dirt Forum for More Information, [This message has been edited by jammin (edited October 27, 2001). Raise the hot rear tire pressures .5 to 1 psi. This will also increase the rotating weight. Leave the heavy hubs and rotors on the shelf. If he was at the track and saw the car run he would know that it worked ( by the way it also worked at Eriez ). Dirt Track Supply is based in Watertown, SD and is one of the leading suppliers of racing parts, race car chassis, and components in the upper Midwest. This is my third book and it is a setup log and notebook geared toward the dirt late model racer. I am finding limited information, and contradicting information on rear moment center location for the stock mounting location points. To help the car turn through rear steer you can run the RR trailing arm uphill a 1/2”- 1” at the front. We almost always need to develop more rear traction for dirt cars. The rear bite number appears to be the weight of the LR minus the RR. If these settings are incorrect, it will cause handling problems as well as scaling difficulty. I was just trying to help a guy asking about what is done to the chassis. It hooks to the left side of the frame and goes across in the shape of a “J,” which is what gives the part its name. As an Amazon Associate, I earn from qualifying purchases. Since oval racers only turn left we can balance the car for better grip in left turns. If you continue to use this site we will assume that you are happy with it. It will take longer for your motor to accelerate your car and it will be more difficult for your brake system to stop the car. I run 3 inches of stagger across the rear. Left Rear Axle Weight in Dirt Late Models and Modifieds, Dirt Track Racing Talk and Some Dirt Late Model Racing Shock and Spring Questions Answered, Some Simple Dirt Late Model Aerodynamics and a Little Fuel Cell Talk. google_ad_height = 90; Thank you for pointing out the obvious to me . Some of the weight increase on the left rear tube will also transfer to the right rear. I used to tune a road racing sedan with equal tire pressures but there you're starting out with pretty even weight distribution and the loads are generally more balanced, what with all the left and right turns. ], [This message has been edited by jammin (edited October 28, 2001).]. I think this will be a good move. Forward traction is also best when both rear tires are biting at their highest potential. Axle weight acts differently than left rear chassis weight. The initial lurch will sink the car. Bottom Line: When you see a car rolling on the right rear, the car is tight because it is transferring less weight, not more weight. chassis first (typically around 8-3/4”), so you can keep the same rear width measurement. //-->
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