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The Drag front springs will allow the front end to lift and transfer the weight to the rear and control the car coming back down; I would set the front at 1-2 on the damping. From the swan song of the Fox Mustang to the birth of the Coyote, Steve had a front-row seat. The remedy here was BMR’s Level 2 Cradle Bushing Lockout Kit (PN CB005; $219.95). VetteMOD.com > VetteMOD Technical Discussion > Chassis, Steering and Suspension > C3 Drag racing rear IRS. On stick-shift cars of any power level, I can usually improve their times with some IRS parts,” he explained. It weighs 3375 with added weight. Pfadt Camaro Coil Overs with Drag front springs will keep the back end tight not allowing it to squat thus keeping your alignment where it needs to be and the tire contact patch as large as possible; I'd recommend a setting of 10 for the rear damping to start. Just the lockouts can be installed with it in place, but to install Kelly’s special upgrade, the cradle has to come down to allow for drilling. Our customers love their products too, so we figured it was the right decision to go with what they have to offer,” Jared explained. All rights reserved. One of the things that makes a huge difference is just how much HP you will run. 30. You can feel it’s much more solid now especially when you have the pedal to the floor and the A10 is banging through the gears,” Jared elaborated. An independent rear suspension doesn’t necessarily perform better than a well-designed solid-axle setup. “Since assisting Viking with the development of the shocks for the S550 over three years ago until the present, I have seen that the S550 simply needs more valving on the rebound side. Colt is an old hand, having upgraded 30-plus S550 rear suspensions, so he knows where everything belongs. I would say the top five fastest IRS S550 Mustangs use this through-bolt arrangement. After reinstalling the lower arm, Colt completely removes the factory toe link, acquires the proper measurement, and installs the more robust, adjustable BMR unit. Drag Racing Cars; Outlaw 10.5; Outlaw 10.5. Something that I see often though is, people using the B258 Warrior series due to their low price point,” Kelly added. This is especially true for vehicles with a lot of front weight bias, like a Mustang. The upgrades also pave the way to handle the power we plan on putting down here shortly.”. Yes, I agree that IRS cars are not as sensative to the height change. A-Arm Suspension System for Chassisworks 4×2″ Crossmembers and Front Clips. Ill be the third party opinion, with some experience to back it up. The Drag front springs will allow the front end to lift and transfer the weight to the rear and control the car coming back down; I would set the front at 1-2 on the damping. Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons, 5th Gen Camaro SS LS LT General Discussions, Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com, MTI Racing 500ci Dominator Engine Assembly. “So many things play a role in achieving a better 60-foot time. It is setup for the pro radial class. You will reuse many of the factory fasteners, so make sure you keep them organized and, if this is your first rodeo, put them in bags or bins marked with their locations. The IRS is not good for drag racing due to weaknesses in the design (i.e. The toe changes alot as the height changes. So I reached out to Kelly Aiken who has always showed us support over the years and he said to come right up and we’ll get the car all setup.”, By replacing a lot of the factory components with the BMR goodies we know we’ve got a much better shot at quicker 60-foot times. I have stopped recommending the Warrior line to my customers with S550 Mustangs. Ford gears, GM gears and Mopar gears. The Ford Racing cover is recommended because it is beefed up and is set up for plumbing for a diff cooler if you plan to hit a HPDE event. Pfadt Racing has helped put the power down in the fastest IRS Corvettes in the World with our suspension and powertrain mounting products. You can bet the 1.45 sixty foot times has given the 'Dragvette 6-Link Suspension System' the ultimate real world test. Those runs resulted in obvious deformations of the factory differential bushings and telltale marks indicating just how much the IRS cradle moved around under load. Tuners will have their customers call me on a daily basis to sort out their traction issues so they can get better data. You guys both sell and support excellent products. We'll send you the most interesting FordMuscle articles, news, car features, and videos every week. I usually stop at this point and like to get data. Lastly, I chose to do the adjustable toe links to enable them to run the alignment that I spec out for combos such as Lethal’s, where superior performance is the primary goal.”. That Kelly owns a 2015 Mustang project — which is in the process of a revival with a powerful new engine — certainly helped him gain an intimate knowledge of how those soft factory mounting points can detract from performance under load. I understand that things like upgraded sway bars (as this is for cornering) won't be necessary - but what is important? Controlling the knuckle assembly that the wheel is connected to pays big dividends in any performance application.”. The car hit the drag strip during the Spring Break Shootout 2015. The “after” shows the same car in the same corner with the same driver, but with a torque-arm rear suspension. ). Read more only at www.gmhightechperformance.com, the official website for GM High-Tech Performance Magazine! Much like the rest of the factory suspension, the stamped steel, rubber-bushed vertical links offer a bit too much leeway of movement for performance applications. “To date I have had approximately 50-60 customers and friends who have broken stock or aftermarket stock style bolts, but I have yet to have a single failure with a through-bolt configuration. The factory bushings allow quite a bit of movement, and they can even deform under shock loads, which will really throw the geometry out of whack. If you don’t have access to one, you can likely grab a simple one at your local discount parts retailer. Indeed, BMR’s Ford specialist has dedicated a significant amount of time and energy to refining Ford suspensions. The company has long sold and utilized those familiar red and hammertone parts under its long line of project cars. My method removes the shear loads on the threads and places them on the larger and much stronger shanks of the bolts. With street tires it would spin, but my buddy who also had pretty much the same car could get great hookup. From all initial impressions I really think this will be a game changer for our cars! “Consistency is the primary concern for my racers,” he added. With that in mind, we met Lethal’s Jared Rosen and Christina High at BMR HQ to document the installation of these upgrades under the rear of the company’s second-gen S550 project. If the rear tires are “In” at the top, there’s something wrong. We will have the same set-up for the Camaro as well. “The car drives real nice. Colt installed the inserts and washers in the traditional fashion on the rear bushings. “As you know, I learned early on that hitting the tires hard and having parts move is a bad recipe. However, they should be even more important as Team Lethal starts to apply more power with a supercharger. Also, keep in mind that your car will squat less as you go through the pass, and getting traction for the 1-2 shift (and depending on power 2-3) is equally important, for auto or manual. Suggestions please ? “We’ve been using BMR’s products for many years now on several project cars. Otherwise it seems like I've always had better ability to avoid axle hop with a solid rear setup rather than with an IRS...any thoughts? Poor half shaft design resulted in quite a few hardcore drag racers replacing the IRS system with an LRA setup. How to set up a no-bar car - posted in Slot Drag Racing: What is the trick to setting up a no bar car ? These braces ensure the cradle stays put when you drop the hammer. His knowledge of cryptocurrency is a bit suspect, however. All of this makes for a winning combination.”. A live-axle rear end setup has the control arms pushing and pulling on the chassis, causing the rear tires to get planted into the ground as the body separates to help achieve that traction. Before fully reassembling the rear suspension, Colt and the BMR team dropped the factory exhaust from the Lethal Mustang to allow lowering the IRS cradle for full access to the differential bushings. With a jackstand keeping things loaded until the right time, he loosens all the connections, hangs the brake caliper safely out of the way, removes the factory shock, and pulls the coil spring. To get that knuckle under control, he chose BMR’s Adjustable Toe Links (PN TR005; $229.95), Rear Lower Control Arms Vertical Links with polyurethane bushings (PN TCA048; $99.95), and Rear Lower Control Arm Bearing upgrade (PN BK081; $159.95). So this is a big area of concern. 03-14-2009, 07:32 PM. The IRS differential mounts are also very soft, and the differential will pivot during normal driving conditions, and of course, when being loaded up.”. With the hardware out of the way, he pulls the lower control arm. This suspension was designed along with my ultimate IRS subframe to allow the use of any common through-bolt shock, commonly used in all forms of racing. The IRS isa FAR superior suspension component than the archaic stick axle. Check out how Chevrolet Corvette C5/C6s get into the 8s with independent rear suspension. Adding Pedders rear aggressive sway bar with adjustable end links, solid rear diff mount bushings, solid rear cradle bushings, replacing all the rear arm bushings to keep down wheel shake, and installing our Pedders rear eccentric package that will get you a lot more camber and toe change than OE, plus seriously more reliable than OE, you will have a fine package, Our Pedders eXtreme Xa coil overs can lift the back end about an inch if you need to compensate for some serious tires. He even shared PDF cheat sheets with alignment and shock setting specs that were put together with time and experience. While a step in what many would consider a step in the right direction, the 2003-2004 Cobra IRS system needed some major tweaking and revisions. Kit Henry HMS Speedways and Hobbies © 2020 Power Automedia. “Most significantly, past the IRS subframe moving is the IRS rear lower control arm deflection due to the massive rubber bushing on the fore pivot point/mount. “The amount of deflection within the S550 IRS under loaded conditions is mind-blowing. To touch on the shocks briefly, the Viking shocks are by far the most proven and the best product to use. He knows the Whipple will be installed shortly, so he chose the parts that were geared toward getting us off the line smoothly and down the track with consistency. In drag racing, even the slightest loss of traction in the first few milliseconds off the line can make the difference between victory and elimination. We really want to see this car perform its best, so by replacing a lot of the factory components with the BMR goodies we know we’ve got a much better shot at quicker 60-foot times, elapsed times, and consistency. GForce Engineering uses the BMR through bolt set-up with its 9-inch IRS kits as well.”. Here is what I'd recommend. Eliminating the deflection leads to much better consistency. Just out of curiosity, what constitutes the ~$1400 jump in spherical vs poly C-Arm Bushings? PDA. First test session with the GR Ultimate IRS! ... information, and news on all forms of legal drag racing for mostly amateur level racers: bracket racing, sportsman, heads up 10.5, and everything in between. “Most significantly, past the IRS subframe moving is the IRS rear lower control arm deflection due to the massive rubber bushing on the fore pivot point/mount. Some of our Pedders dealers has already busted rear axles with just a tune. That’s why Kelly recommended drilling out the front diff bushings to replace the factory threaded fasteners with more robust through bolts. The Dodge Challenger of John Reed is one of the quickest modern Mopar muscle cars in the world, running in the mid-7-second range with factory-style independent rear suspension setup … I love my IRS for its daily driver characteristics, but, if I was building a drag car it would be the first thing to do. Tom Henry Racing Announces a Special Edition 2010 Camaro. The latest platform requires a premium damper to keep things under control. “I definitely feel the BMR suspension components we added will improve our 60-foot time over what it was for our last outing at the same power level. Colt did the honors and installed the BMR poly inserts and bushing-locating washers, which drastically firm up the factory bushings while keeping the NVH in check. Check out the upgrade here! View Full Version : C3 Drag racing rear IRS. The first thing to look at is rear wheel Camber. Drag racing car setup "A bit of a Drag" This article is merely an introduction to those new to the world of Drag racing, looking to convert a street car for the drag strip. We will safeguard your e-mail and only send content you request. The tuning typically makes progress, which allows for a better 60-foot due to being able to apply more power, sooner.”. 1963-1979 Corvette IRS - Taxing The IRS A Bulletproof '63-'79 Corvette IRS Setup That's NHRA-Legal to 7.50s Drag racers sometimes turn to the spherical bearing in hard-core racing applications, but 90 percent of the S197 Stangs will be fine running a set of polyurethane bushings. I cannot see taking drag race car to an alignment shop and expecting them to come up with your best set up unless they actually understand aircooled VW suspensions that are being drag … I spend a lot of my spare time coming up with solutions for my customers to help prevent them from having part failures, hence the differential bolt upgrade we performed on the Lethal car.

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