Muscle Mustangs & Fast FordsHow To Drivetrain
Motorsports' Clutch-Release System - No Pain, All Gain
A Prescription For Left-Leg Relief From Maximum Motorsports
Got a tired left leg? Blame the Mustang's ancestry. Your late-model Mustang inherited its clutch cable from the Pinto-based Mustang II.
Sure, the cable was perfectly adequate for working the clutch behind the anemic V-8 of the time, but the Ford engineers probably didn't anticipate that their clutch-release system would still be used 30 years later on a 390hp Mustang Cobra. In fact, it wasn't until the '05 S197 platform that the Mustang got its first hydraulic clutch.
Don't get us wrong--a clutch cable system is simple to design, inexpensive to build, and easy to maintain. When neglected, cable-actuated clutches can become hard to push, especially in high-torque applications. Take the '03-'04 Mustang Cobra, for instance. The Terminator's 11-inch single-plate clutch is designed to hold the supercharged engine's generous grunt, but consequently it takes generous grunt to disengage. In terms of pedal effort, the Terminator probably tops the list. But this also makes it an ideal car to use when investigating how to get the most out of a cable-actuated clutch-release system.
The subject of this project is an '03 Cobra that already has an aftermarket quadrant and adjustable cable. Even with these parts installed, the owner complained of a "heavy and mushy" clutch pedal that, although adjusted correctly, didn't disengage until pushed completely to the floor.
After extensive research, the owner settled upon a new clutch cable, quadrant, and firewall adjuster package from Maximum Motorsports. As with most of its products, Maximum Motorsports evaluated each component in the clutch-release system to minimize its shortcomings and improve upon the OEM and aftermarket offerings. The Maximum Motorsports package includes a billet-aluminum clutch quadrant, a firewall adjuster, and a modified OEM Ford clutch cable.
Since the two biggest factors that contribute to excessive pedal effort and mushiness are friction and flex, they are the design focus of the Maximum Motorsports clutch-release system. Friction is minimized by utilizing an OEM Ford cable; its stiff cable housing also reduces flex. The Maximum Motorsports firewall adjuster eliminates the need for the rubber bushing on the firewall end of the cable, and the one-piece quadrant further reduces flex.
By an unscientific seat-of-the-pants measurement, the Maximum Motorsports clutch cable/quadrant/firewall adjuster package reduces pedal effort by quite a bit. In addition, the clutch disengages roughly midway through the travel of the pedal, making this '03 Cobra easier and more pleasurable to drive.
Follow along as we highlight the details and installation of the Maximum Motorsports clutch cable, quadrant, and firewall adjuster package.