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Part 8: Finishing Touches to Get Ready to RaceWe put the finishing touches on the Stealth Bomber From the October, 2004 issue of Mopar Muscle By Marko Radielovic Photography by Marko Radielovic
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Well, we're on the home stretch. We're three days away from the NevadaOpen Road Challenge at the time of this writing. by the time this hitsthe newsstands, we will have already completed the race and, hopefully,finished shiny side up. If you've been following along, you know we'vebeen preparing our Project Stealth Bomber '89 Diplomat police car forthe Nevada Open Road Challenge (NORC)--an open-road race in Ely, Nevada,spanning a 90-mile stretch of Highway 318. For the uninitiated, we tookone slightly worn ex-patrol car, rebuilt and beefed the A999 automatictrans, freshened up the front suspension, added some modificationsincluding Koni shocks and a Quickor sway bar, put a 2.76 gear and alimited slip in the 8.25-inch rearend, and dropped in a warmed-over 360to provide forward thrust. We would be competing in the 110-mph classwith a whole gaggle of much more exotic iron. This final installment before the race focuses on safety equipment. Wecannot overstate the importance of safety, particularly in this form ofracing. While all racing should be treated with respect from a safetystandpoint, open-road racing is serious business. sustained high-speedsand varying course conditions require a level of preparation not foundin many other forms of racing, from a mechanical perspective as well asa mental perspective. While the Silver State Classic Challenge web siteclearly explains the rules of preparation for the event, be sure thetechnical inspection won't overlook any shortcomings or shortcuts youmay have taken to prepare your steed. As you will see, we've goneoverboard with the safety equipment, but that's not a bad thing as weintend to step the interceptor up in class in the future. Always betterto have more safety equipment than what is required. We also addedbigger front disc brakes from a '79 Plymouth Gran Fury police car, newhigh-speed tires, and a slew of other items to make the Stealth Bomber abetter car and open-road racer. Tires are the hottest issue in open-road-type racing as they can meanthe difference between successfully completing the event and balling upyour ride. When we set out to find a suitable tire for our needs, therealization that 15-inch tires are no longer en vogue became crystalclear. Don't take us wrong, there are plenty of 15s available, but notstreet-legal, V-rated tires. A V-rating means the tire is capable ofsustained 149 mph. So, with that in mind, we looked into the realm of anemergency vehicle tire. Not only are they speed rated, they are held toa much higher standard than ordinary tires. we opted for Firestone'sexcellent PV41 Firehawk series of tires. The PV in PV41 stands forPursuit Vehicle. Keep in mind, the Stealth Bomber isn't the lightestweight vehicle to ever hit the road, and, in fact, "portly" is puttingit mildly. The PV41 tire was designed for police vehicles, traditionallyheavy and large four-door sedans laden with a boatload of additionalemergency equipment. Wanting the biggest contact patch available, wespec'd Firestone's 235/70/R15. Before you scoff at the height of thesetires measuring a full 28-inches tall, remember the NORC features widesweeping turns, therefore the tall sidewalls won't be a detriment.  The SSCC (Silver State Classic...  The SSCC (Silver State Classic Challenge) demands a high-quality metalvalve stem be used. Arcadia Firestone provided the stems and caps.  We took our salvage-yard-issue...  We took our salvage-yard-issue police steelies (15x7-inches) over toArcadia Firestone for mounting and balancing.  Technician Glenn Starr mounted...  Technician Glenn Starr mounted and dynamically speed balanced our tiresto ensure that our ride would be glass smooth at triple-digit speeds.The last thing you want is an unbalanced tire when traveling atsustained high-speeds.  Brake Dancing While combing...  Brake DancingWhile combing through our local boneyard one fine Saturday afternoon, wecame across a '79 Gran Fury police car. It turned out to be a treasuretrove of special parts, including a set of 113/4-inch disc brakes. Thesebrakes will bolt right up as long as you take the caliper brackets aswell, making it an easy swap. The brackets move the existing caliperoutward. Once we had the rotors resurfaced, we took the opportunity toreplace the wafer-thin pads with new semimetallic pads from our localparts emporium.However slight, the caliper brackets on the big brakes (11.75 inches vs.11 inches) moves the caliper out farther, clearing the larger rotor.  A high-speed misfire above...  A high-speed misfire above 5,500 rpm prompted us to visit GlendoraDodge's parts department for a "chrome box" ECU. It's a directreplacement for the orange box, and provides a stronger spark at higherengine speeds than the entry-level orange unit.  A Summit Racing driveshaft...  A Summit Racing driveshaft loop was ordered for obvious reasons, eventhough we replaced our ailing u-joints. Though it's not required in ourspeed class, we felt it was a good piece of insurance in the unfortunateevent of a u-joint failure.  The new rotors are nearly...  The new rotors are nearly 1-inch larger in diameter, necessitating thecorresponding caliper brackets. But that's it, you can use your stockcalipers and still have big brakes.  We also seized this opportunity...  We also seized this opportunity to replace the wheel bearings andseals--a good idea when demanding sustained high speeds from yourvehicle. Mobil 1 synthetic grease is always a good idea, but not anoption with this type of an application where heat, a byproduct ofspeed, will be prevalent. It's worth the extra bread.  (above & right) JAZ rollbar...  (above & right) JAZ rollbar padding was also procured from Summit Racing to keep ournoggins protected from making contact with the Competition Engineeringrollbar. The padding mounts via Velcro.  Bill Simpson's Impact Racing...  Bill Simpson's Impact Racing harnesses were used for the driver andnavigator. These five-point harnesses mount using the factory lap-belthardware. The shoulder belts wrap around the roll bar, requiring you todrill only one hole for the submarine belt. Installation is a snap. theyprovide the necessary security and look sharp.  Another safety feature not...  Another safety feature not required, but one we felt was a good idea,was the addition of hood pins. We can think of few things less pleasantthan having your hood open at triple-digit speeds. Our local parts housewas the source for this inexpensive bit of insurance.  We chose the bumpstop to mount...  We chose the bumpstop to mount the post for the hood pins.  Our buddy Robert Hendrix drilled...  Our buddy Robert Hendrix drilled through the hood after drilling a pilothole through the underside in the spot where the bumpstop rests when thehood is closed.  We were able to reuse the...  We were able to reuse the factory issued rubber bumpstops by slippingthem over the posts.  (above & right) In our haste...  (above & right) In our haste to get the Diplomat running, we cobbled our fuel systemtogether using pieces of old braided steel line, hose clamps, the oldfuel filter, some duct tape, bubblegum, and bailing wire. We went toHolley for Earl's Plumbing Super Stock fuel line (3/8-inch) and theirSuper Stock push-on fittings. This fuel line is a nice alternative to abraided hose. The remainder of the fuel system remained stock, save forthe Holley mechanical fuel pump.  (above & below left) Earl's...  (above & below left) Earl's suggested we use assembly lube to mate the fittings to the hose,but we substituted 20W50 motor oil. Use it sparingly.  (above & right) Due to the...  (above & right) Due to the gear swap (2.76 vs. 2.94) and tall tire combination (28inches), we had no way of accurately measuring our speed. So, wecontacted Garmin Industries, maker of some of the most cutting edgeGlobal Positioning Satellite (GPS) units. They provided us with one oftheir GPS V systems. We used three of its many functions during theNORC: real speed, average speed, and the trip meter.  Since Highway 318 (the location...  Since Highway 318 (the location of the NORC) is located in the middle ofNevada's high desert, a Garmin Mighty Mouse II antenna was mounted inour rear window to make absolutely sure we could acquire the necessarysatellites.  As with our motor oil and...  As with our motor oil and rearend gear lube, we utilized Royal Purple'sexcellent synthetic transmission fluid. Even though equipped with a goodfactory police transmission cooler, the extra insurance offered bysynthetic trans fluid was comforting.  Due to our less-than-stellar...  Due to our less-than-stellar aerodynamics, we decided to build a chinspoiler from sheet aluminum to direct air out from underneath the car.This will plant the front-end more firmly at speed. And believe us whenwe tell you, a Diplomat is aerodynamically challenged with the same dragcoefficient as a vending machine. Jim Sleeper used air-operated snips tocut out the spoiler, mimicking the shape of the front bumper.  Jim rough fits the spoiler...  Jim rough fits the spoiler to the bumper.  After drilling the holes,...  After drilling the holes, 1/2-inch pop rivets were used to secure it tothe bumper. We were now ready for NORC.  We went back to Koni for a...  We went back to Koni for a more aggressive shock. Koni stepped up withan even more aggressive valving in the PN 80-2660 shocks, providing evenstiffer handling and high-speed stability.
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