dirt late model lift bar setup

Birkhofer says his team is working to make the car more balanced, learning the exact location of the moment center design. That is rear steer, and in dirt track racing, rear steer is very important.From left to right: Roll Oversteer, Roll Understeer, and Neutral Steer.Being able to identify a loose or tight condition is the first step in using rear steer to help performance. /Producer (SmartSoft\040PDF\040Printer) What used to be standard setups are a thing of the past for the top teams competing in dirt late models, modified, and even the stock classes.The dirt car Moment Center design is different than that of an asphalt car. © 2002-2020 Longacre Racing.Article & Photography by Bob Bolles, Circle Track Magazine (Powered by the Hot Rod Network) 2001 Warrior 4-Bar / Z-Link - Page 1 - Page 2 - Page 3 - Page 4 - Page 5. Pull bars. Dirt Track Tech. Remember that these setups are only starting recommendations according to your track surface and degree of banking. “With most birdcages, 46-degrees is the maximum [for rear steer],” he says. In many instances, teams opt for shorter suspension bars to quickly transfer weight to the right rear wheel.

I can simulate it, and I will be 4- to 6-inches or so, but those numbers aren’t really known. 3 0 obj

Some racers have even been known to run a stiffer RR spring when conditions warrant less RR chassis travel.The RR can be a little softer to promote traction off the corners, but that will produce more chassis roll at the rear and unload the LF tire. Racing Results/News. All is going to be lost once that LF comes up as we accelerate.The trend among top racers has been to run more even spring rates across the front and rear and a more level track bar to balance the setup when there is a lot of traction. In many of our articles on various aspects of chassis setup, we try to include both sides of the coin-dirt and asphalt.

Obviously, this has a limited effect on helping a car corner at race speeds on a dirt track. One hundred pounds of LR would indicate that if the car were weighed, the LR scale would read 100 pounds more than the RR scale. In addition, the ride height is often raised by an inch and shock valving is vastly softer.Spring rates handle the transfer of weight and the speed at which the weight is transferred.As Rex Merritt explains, there are few absolute rules for setup.

When the car is static, it will have 24- to 26- degrees, depending on the length of the lower bar. Pull bars and other links help control the speed and amount of driveshaft movement that is allowed.The driveshaft angle is also a consideration, and you can’t run too great of a driveshaft angle otherwise the U-joints will bind.

As you increase the angle, the drive for the right rear tire will improve. I don’t know if I ever measured the centerline on the front wheel and the centerline of the rear wheel to figure how much roll steer I get in the car. This article is all about dirt car setup and nothing else. This comes from the flat sides of the car striking the air, similar to the effect of a wing on a Sprint Car. The shock controls both, but obviously must do much more work in the rebound mode.LR weight refers to the number of pounds of weight supported by the left-rear wheel versus the weight supported by the right-rear (RR) wheel. Picture a centerline down the middle of the car from nose to tail. They come into the pits and they’re changing this or that. 2003 Warrior Underrail 4-Bar - Page 1 - Page 2 - Page 3. endobj /Resources << You need to be able to analyze the conditions and adjust the setup accordingly, so the moment of center is the ideal position for the prevailing track conditions.

Graphic from AFCO Racing.A double-shock right rear setup.