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Boss Suspension - Over The TopSteeda Boss Build From the January, 2013 issue of 5.0 Mustang & Super Fords By Steve Turner Photography by Steve Turner
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It's still hard to believe how far the Mustang has come since the sunset of the New Edge run. As the S197 Mustang was born, it ushered in a whole new era of Mustang performance and driveability. The leap from '04 to '05 was huge. Yet in 2010, there was another big step ahead. These days the difference between the likes of a Boss 302 and its predecessors is flat-out mind-blowing.
"The '04 and earlier cars were fine, and they adapted well to aftermarket modifications," Steeda President and CEO Dario Orlando explained. "The '05-and-later platform provides an even better basis upon which we can apply our aftermarket expertise to further enhance performance. Overall, the S197 platform is a stiffer and more advanced chassis, which provides Mustang drivers enhanced overall performance levels." When you jump behind the wheel of a Boss 302, you might assume that it is the pinnacle of Mustang performance and there's no need to go any further. Well, the factory has certainly raised the bar on what is possible from a stock Mustang, but there's still a little room left for improvement. That's why Steeda Autosports decided to take the top-of-the-line handler, a '13 Boss 302 Laguna Seca, and push its envelope with a full suspension makeover. "The engineers at Ford Motor Company did an amazing job at developing a track-ready vehicle right off of the assembly line," Dario said. "It was only logical that we take their outstanding platform and make an even better performing track vehicle for the niche performance enthusiast. By adopting our ISO engineered and manufactured products, which are also track tested under the most grueling conditions, we were able to still substantially improve upon the Boss 302s performance levels without compromising the integrity or NVH of the vehicle."  Steeda chose these sweet forged...  Steeda chose these sweet forged HREs to really set off the Boss 302 LS. Their Satin Charcoal finish is a nice match with the factory stripes, and these 20-inch hoops are actually 10 pounds lighter than the factory wheels. Combined with the lowered ride height offered by the Steeda adjustable suspension, this black Laguna Seca presents an even more sinister visage.  After pre-routing the brake...  After pre-routing the brake cooling ducts, Steeda technician Steve Chichisola got down to business by removing the stock brake rotor and dust shield.  With a lowered ride height,...  With a lowered ride height, the Boss will require revised steering rack geometry courtesy of Steeda's Bump Steer kit (PN 555-8106; $167.95). The first step of that install is removing the stock tie-rod end and installing this Steeda beauty. "ISO Certification establishes a high standard for all operations involving the engineering, design, manufacturing, and customer service. Translated, it is the customer guarantee that the products are manufactured to the highest possible standard with precision, quality, and durability," Dario explained. "Steeda is one of few aftermarket companies that has achieved this level of certification. While it is a costly and dedicated process for us to administer, our customers benefit with the quality of products we manufacturer." Of course, the parts improved the Boss 302's inherent handling characteristics. The good news is that this same gear can be applied to a base Mustang or Mustang GT and the gains will be even more noticeable. Even GT500s, especially the earlier versions, can benefit from this sort of suspension gear. "(It's a) night and day difference in terms of responsiveness and forward grip," Dario enthused. "You simply will not believe how the Steeda Boss Suspension package can dramatically improve the handling of a stock Mustang GT." In fact, our own Project Vapor Trail wears many of the same parts. Obviously the spring rates differ for the lighter Boss, and PVT doesn't have the latest adjustable sway bars, but the combination is similar enough. Knowing the same parts that will better a Boss are on our project car stemmed a bit of your author's new-car envy. "While this package is optimum for the Mustang GT and the Boss 302, for the GT500 we have a different package—it compensates for the increased weight of the GT500 engine, and still delivers mind-blowing performance and grip that approaches the Steeda Boss 302 package," Dario added. So follow along as we watch this combination come together. We'll have a full report on the completed car in an upcoming issue, but suffice it to say, it's an impressive ride. Horse Sense: Steeda is more than just a parts house. They also offer a full line of serialized Mustangs, including Steedafied versions of the Boss 302 and GT500. If that is more your speed, you can hit them up at vehicles@steeda.com for more info.  Another important geometry...  Another important geometry revision for the front suspension of a lowered Mustang is Steeda's X11 Ball Joint (PN 555-8136; $157.95). These ball joints raise the front roll center back to where it should be to compensate for the lowered ride height. This helps handling by lessening understeer and bodyroll. Steve pressed out the stock joint and replaced it with the X11.  After installing the X11 ball...  After installing the X11 ball joint and removing the factory adjustable strut, Steve replaced the strut with Steeda's adjustable suspension system (PN 555-8127; $1,574.95). It includes the necessary Heavy Duty Upper Strut Mounts (PN 55-8135; $349.95), as well as the Tokico D-spec struts and shocks. The Tokicos offer adjustment of the compression and rebound.  After installing the struts...  After installing the struts and bumpsteer kit, Steve replaces the standard dust-shield with the Laguna's included, but not factory-installed, brake-cooling version. This is part of the Laguna Seca package but must be installed post title. If you want to add this setup to your non-Boss '13, the kit is available from Ford Racing Performance Parts (PN M-2004-MBA).  One advantage of having a...  One advantage of having a completely adjustable suspension is you can manipulate the weight at each corner of the vehicle to balance the car's weight distribution and improve its handling. “Setting corner weights allows you to properly balance the car to optimize performance and driver comfort," Dario explained. “By setting corner weights, you also have the ability to optimize the vehicle's weight distribution front/rear to improve handling and traction to the highest level of performance under all conditions--accelerating, braking, and cornering. In the case of the Steeda Certified Boss 302, we were able to nearly achieve this perfect weight distribution--missing it by only less than one percent--an amazing accomplishment for a production Mustang!" To measure the corner weights, Steve places scales under all four wheels.  Should you need to adjust...  Should you need to adjust the front coilovers or the rear perches, you'd loosen the Allen locking bolt and use this spanner wrench to relocate the spring mount. This is most easily achieved with the car's weight unloaded. You'll want to make the changes in measurable turns. This also adjusts the car's ride height, so you'll want to put the car back down and make sure the pavement to fender-lip measurements match on each side.  "Ideally, for maximun traction...  "Ideally, for maximun traction and handling, you want as close as possible to a 50/50 weight distribution with equal balance left and right," dario said. Steve must have the magic touch honed from years of installind Dteeda gear on Mustangs, as the corner weights were nearly spot on without making a single adjustment. The front corners were within 3 pounds and rears were within 34 pounds.  With the stock gear out of...  With the stock gear out of the way, Steve installs the Steeda rear springs and adjustable perches together. This clever billet adjuster allows the replacement spring to fit on the stock location, while still allowing for ride-height changes.  Steve pre-routed the ducting...  Steve pre-routed the ducting from the front fascia scoops to the back plate, but before clamping it in place, he trimmed a bit of the metal wire endoskeleton from the end of the house to ensure a tight seal between the hose and backing plate.  The factory Boss Brembos are...  The factory Boss Brembos are pretty great, so Steeda stuck with them on this build; Steve just reinstalled the factory stoppers.  Out back, Steve removed the...  Out back, Steve removed the factory sway bar, Panhard bar, springs, and shock absorbers.  Steve rounds out the rear...  Steve rounds out the rear Adjustable Suspension System by installing the infinitely double-adjustable Tokico D-spec shocks.  Don't think this is just a...  Don't think this is just a spring and shock upgrade. Here Steve removes the NVH-centric stock lower control arms.  While the Steeda Billet Lower...  While the Steeda Billet Lower Control Arms (PN 555-4405; $279.95) are certainly stiffer than the stock pieces, they feature polyurethane bushings, so they retain streetable levels of noise, vibration, and harshness. Here Steve applies grease to the bushings to make sure the stiffer bushings don't squeak.  After removing the stock upper...  After removing the stock upper control arm and its mount (one fastener must be accessed below the rear seat), Steve bench-assembles the street Adjustable Third Link (PN 555-4112; $179.95). This link allows for complete adjustment of the pinion angle, but Steve starts by adjusting its length to 8.36 inches, which is a bit shorter than the stock 8.48-inch length. The chassis side of the mount must be torqued to the factory 129 lb-ft specification, which is best achieved outside the car with the mount clamped in a vise.  With the upper arm installed...  With the upper arm installed in the mount, Steve reinstalls the mount and torques the arm to the rearend housing. Once the car is at its final ride height and the suspension is bearing the weight of the car, Steve will use a magnetic angle finder to set the proper pinion angle. Steeda recommends between 2 and 5 degrees down.  After bolting on the Steeda's...  After bolting on the Steeda's billet caliper mount, Steve installs the ABS sensor in the new bracket.  In order to install the Steeda...  In order to install the Steeda 13-inch Rear Brake Upgrade (PN 555-6009; $539.95), Steve drains the rearend fluid, removes the differential cover, pulls the pinion shaft, pops out the C-clips, and slides out the rear axles.  Post axle removal, Steve unbolts...  Post axle removal, Steve unbolts rusty stock caliper mounts. The rear upgrade kit also features braided steel brake lines, which will require bleeding the brake system.  The new bracket relocates...  The new bracket relocates the stock rear caliper to the proper spot to accommodate the new 13-inch DBA rear brake rotor. These larger, vented rotors should shed more heat; they certainly do a better job providing an appropriately sized backdrop for larger-diameter wheel packages.  Supplanting the factory Panhard...  Supplanting the factory Panhard bar is Steeda's Watt's Linkage (PN 555-2525; $1,049.95), which does a superior job of eliminating lateral suspension motion. Because the Panhard rod is fixed at rearend on one side, it will move with the suspension, while the Watt's remains steadfast. Additionally, the Steeda Watt's offers an adjustable rear roll center to precisely dial in the handling.  The rugged, chrome-moly Watt's...  The rugged, chrome-moly Watt's mount bolts to the chassis, while its rearend attachment points clamp securely to the rear axle tubes.  Next up, Steve installs Steeda's...  Next up, Steve installs Steeda's Adjustable Rear Sway Bar (PN 555-1073; $384.95), which offers three levels of a stiffness adjustment. The billet end-links and polyurethane bushings also firm things up a bit over the stock parts. It was necessary to move up to Steeda's top-shelf gear to out-do the robust Boss LS gear.  When Steve bolted on the billet...  When Steve bolted on the billet lower control arms, he also added Steeda's Lower Control Arm Relocation Brackets (PN 555-8119; $141.70), but these must be welded in placed once the chassis is loaded with the vehicle weight. These brackets are necessary to restore proper instant-center geometry on a lowered Mustang.  Steve returned to the Watt's...  Steve returned to the Watt's with a digital level to adjust its linkages so they are parallel to the pavement. A proper adjustment ensures that minimum of lateral movement in the suspension.  Returning to the front, Steve...  Returning to the front, Steve once again called on Steeda's big-gun Adjustable Front Sway Bar (PN 555-1070; $208.95) to upgrade the Boss' front-end grip.  Remember those beautiful HRE...  Remember those beautiful HRE wheels we showed in our lead photo? Well, Steeda does all of its own mounting and balancing in-house. Here Steve mounts the Nitto NT05 rubber on the forged wheels. These beauties measure 20x9.5 inches up front and 20x10 in the rear, and wear corresponding 275/35-20 and 315/35-20 Nittos.  After mounting the wheels...  After mounting the wheels with black locking lugs (PN 182-71683NBC), Steve performs a performance alignment on Steeda's computerized alignment rack.
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