A typical problem is a spring that has excessive arch in the center. Verify the leaf spring for consistency in the arch. This insures properly made springs, guaranteed arch tolerances, access to complete labs for testing and research with technical racing experts to understand your requirements.Įxamine the spring immediately upon receiving. Only use springs manufactured by companies such as LANDRUM SPRING that have a complete manufacturing facility. HOW TO EXAMINE AND CHOOSE YOUR HIGH PERFORMANCE LEAF SPRING Furthermore, the fiberglass spring is susceptible to damage from rocks and debris. Another problem occurs with inconsistent resin mix which will cause the leaf to splinter and break. The resins break down when exposed to heat and heat cycles (produced from exhaust and/or brake systems) which will cause the resin in the spring to become brittle, resulting in the spring collapsing. In addition, fiberglass springs are sensitive to heat. The disadvantage is that they produce inconsistent spring rates. However, the cost is three times greater. Fiberglass Leaf Spring – The fiberglass leaf spring is made of a mixture of plastic fibers and resin it is lighter than all other springs.The advantage of this style is that the spring is lighter than the multi-leaf. This style is sufficient to control axle torque and dampening, while maintaining ride height. Parabolic Single Leaf – Consists of one main leaf with a tapered thickness.The spring rate is lighter than other styles of leaf springs and usually requires a device to control positive and negative torque loads as well as requiring coil springs to hold the chassis at ride height. 323 in thickness throughout its entire length. Example – the leaf will be 2 1/2” wide throughout its length, and. Mono Leaf Spring – Consists of one main leaf where the material’s width and thickness are constant.It consists of a center bolt that properly aligns the leaves and clips to resist its individual leaves from twisting and shifting. Multi-Leaf Spring – This type of leaf spring has more than 1 leaf in its assembly.There are four basic types of leaf spring systems in the racing industry today. We will cover the different aspects of leaf springs from free rate to installed rate, applications, hook up points and other performance enhancing factors. Due to the fact of the popularity of the leaf spring system, we felt racers may want to understand more about how the suspension actually works. In addition, the leaf spring suspension is more forgiving on chassis set-up errors. ![]() ![]() Leaf springs possess many desirable suspension features, such as dampening, forward bite, roll over steer, high anti-squat percentage, and high lateral stiffness. Although they are the oldest, they seem to be the least understood. Search for “QM Tuner” Cost: $29.Leaf springs are the oldest form of suspension in racing. Tire durometer charts for commonly used quarter midget tires.Ĭontact us at: or app is available at the Apple app store. ![]() ![]() Weight and age restrictions for each of the QM classes/divisions Simply tap on the issue to find suggested solutions to your problems. Tool allows you to enter your inventory of gears and it will select the gears you need based on your inventory and the tolerance that you desire.ĭrill down chassis adjustment reference guide to help diagnose common conditions such as oversteer and understeer. Log every setting and configuration on the quarter midget for all 4 corners (including mass with a built-in cross weight calculator and automatic stagger calculator), track temperature, air temperature, etc.ĭetermines the engine and axle gears that you need to obtain your ideal rpm. Manage & Track Current & Optimum Settings for Multiple Tracks & Multiple Cars Whether you're a novice or an expert quarter midget racer, or even a team mechanic, QM Tuner offers a variety of tools to help with racing. QM Tuner is the premiere iPhone, iPad and iPod Touch app designed for quarter midget racing.
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