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Phone: 248.677.3299 E-mail:sales@mrxmotors.com |
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PH: 248.677.3299 Copyright© 2010 MRX Motors. All rights reserved. |
General Benefits of Big Brake KitsBig Brake Kits give your vehicle that Supercar look and feel, and exceed stock performance in two areas. First, larger rotors increase heat capacity. Second, stiffer calipers and stainless steel lines reduce system compliance. The key, however, is to increase heat capacity and reduce compliance without upsetting the stock front to rear brake torque ratio. If the brake upgrade you select adds too much front torque (as many do), you reduce your car's ability to utilize the tractive capacity of all of the tires to the maximum practical extent (even on ABS equipped cars) and you therefore create performance sacrifices. In addition, too many pistons or pistons that are too large will make the brake pedal much more difficult to modulate, which limits a driver's control of brake input on the race track. Advantages of StopTech over other brake upgrades:· Shorter Stopping Distances · Better Brake Modulation · Firmer Brake Pedal Less Brake FadeFeature Benefit Summary:· Balanced Brake Upgrades™ with optimum brake bias offer the shortest stopping distance with the best pedal feel · Our patented AeroRotors® with the best airflow available result in better cooling, less fade and longer rotor and pad life · The stiffest aftermarket calipers with patented bridge result in better clamping under hard braking and less pad taper Track testing of new applications ensures optimum performance. In simple terms, optimum brake bias (balance) is obtained when a vehicle's front-to-rear brake force ratio (or force bias) exactly matches the same vehicle's dynamic front-to-rear weight distribution (or weight bias) under a given loading and deceleration condition. As shown in the figure to the right, distributing brake force so that all four tires are simultaneously generating deceleration proportional to the four individual corner weights will maximize brake efficiency. Consequently, the stopping distance will be minimized. It is purely the combination of these two factors - brake force and corner weight - that determines a vehicle's optimum brake bias. Therefore, when selecting a big brake upgrade one should be aware that changing the force (or torque) output of the front brake components without changing the force (or torque) output of the rear brake components can cause an undesirable shift in bias. Starting at 3,300 lb. static, corner weight changes that occur dynamically at 1.05 g.
For optimum brake bias, the brake force at 1.05g would be 2,652 pounds brake force front, 813 pounds brake force rearThe most dramatic brake bias mismatches are usually brought about by big brake "upgrades" which are not properly matched to the intended vehicle. How can this occur? Any time that a bigger front rotor is installed there is a simultaneous need to decrease the effective clamping force of the caliper (installing smaller pistons is the easiest method) to offset the increased torque created by larger rotor effective radius (see the chart on next page). Unfortunately, too many of these "upgrades" do not take this factor into account, and those applications end up with both bigger rotors and larger pistons which serve to drastically shift the brake bias forward. As a result, stopping distances can go up dramatically.
So why does brake bias matter? On the race track, outbraking your opponent by just two feet every lap might not sound like much, but over the course of a twenty lap sprint race it can result in a three to four car length advantage at the checkered flag. To the racer, decreased braking distance is the same as free horsepower. Street drivers also need to take heed of bias, as the effects of improper bias not only result in sub-optimal stopping distances but can also include sub-optimal brake pad life (too much front bias) and/or premature ABS activations. For example, if a car is too heavily front-biased in its typical operating deceleration range, it will wear front brake pads more quickly due to the fact that the rear brakes are not contributing as much as they could be. StopTech is the only brake upgrade company providing proper brake bias with front only or four wheel brake upgrades. As our test data below clearly shows, attention to brake bias matters whether you are racing for the lead or are simply driving to work. This is exactly the reason why StopTech performs instrumented testing for new applications we develop. You're not just buying parts - you're also buying the assurance that the brake bias has been developed, tested, and ultimately optimized for your exact application.
Benefits of Balanced Brake Upgrades™· Shorter stopping distances · Firmer brake pedal · Improved brake modulation · Reduced brake pedal travel · Optimized for ABS performance · Optimized for OEM master cylinder
Improved cooling and heat capacity means less fadeStopTech has incorporated several design innovations to improve rotor airflow, cooling and heat capacity. The ability to absorb and dissipate heat is essential to brake system performance. Benefits of Improved Airflow· Less fade · Longer rotor and pad life Beter performanceAEROROTOR®The patented AeroRotor® features curved vanes with innovations on leading and trailing edges. The uniquely designed vanes inside the disc optimize airflow through the rotor. This improved directional design minimizes turbulence and flows more air than any rotor tested. The result is up to 80% better airflow over original equipment rotors and 10-30% better airflow than directional vaned racing rotors currently available.
AEROHAT™Outer rotor faces run hotter. The patent pending AeroHat™ has directional stand offs between the rotor and mounting bell (hat) that increase airflow to the outside faces of the rotor by 50-100%. Increased airflow reduces the temperature difference between the inside and outside faces of the rotor resulting in less distortion and better performance compared to other fully floating designs. Outer pad wear is reduced. AeroHat™ improves entire brake system airflow by up to 4%.
The below chart shows that StopTech (top red line) has the highest induced airflow of any rotor tested. Leading aftermarket and original equipment rotors were tested for airflow from 30mph to 150mph. AeroRotor® dramatically outperformed all other rotors, with improvements from an impressive 11% to a staggering 80% increase in airflow (corrected to 20°C and sea level.)
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ST40 Brake Kit, 328mm Diameter Includes 4-piston ST40 Red calipers, 328x28mm 2-piece floating and directional slotted brake rotors, adapter brackets, StopTech brake pads, and brake hoses. Calipers may also be special ordered in these colors: Silver, Black, Yellow, & Blue. Rotors may be special ordered in a cross-drilled pattern. The last 2 digits of our brake kit part number designates the caliper and brake rotor finish options. Popular options are: Please contact our sales department for more information on special order options. |
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Part Number: 83.240.2300.51 |
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Price: $1595.00 |
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2 Piston Calipers |
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Part Number: 83.240.4300.51 |
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Price: $1995.00 |
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4 Piston Calipers |
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Kit comes standard with slotted rotors. Add $100 for cross drilled and slotted rotors. |