4-valve-per-cylinder, 4-cylinder Offenhauser. You don't want them loose, but free is a good thing. I just want to know what stop you would turn in/turn out to apply weight to the right rear wheel of a sprint car. The easiest way to safely lift your factory torsion bars is to upgrade the torsion keys. will make the car handle the best in the closing stages of the race. When the universal joints at both ends that let the driveshaft turn when the rear axle Torsion Bars Schroeder $130.99 - $135.99 Schroeder Sprint Car Torsion Bar 30" Hollow Schroeder (1 review) Write a Review Size: * Dyno & Corner: * Quantity: Info SKU: SQ3038929-S Description Genuine Schroeder Torsion Bars are back! become popular with local racers, since the 360s can still crank stands, while the driver wrestles frantically with the steering Chalk Stix Maxx 1-1/8 x 30 Inch Sprint Torsion Bar, Chalk Stix 1-1/8 Inch Sprint Torsion Bar, 30 Inch, DMI Reactor 1-1/8 x 30 Inch Sprint Torsion Bar, Chalk Stix 7/8 Inch Mini Sprint Torsion Bar, 26 Inch Long, Schroeder Mini Sprint Torsion Bars, 3/4 x 23 Inch, Solid, Schroeder Mini Sprint Torsion Bars, 7/8 x 24 Inch, Solid, Schroeder Mini Sprint Torsion Bars, 7/8 x 26 Inch, Solid, Schroeder 7/8 x 24 Inch Mini Sprint Hollow Torsion Bar, Schroeder Mini Sprint Torsion Bars, 7/8 x 26 Inch, Hollow, Schroeder Micro Front Half Solid Torsion Bar - 7/8 x 14-1/2 Inch, Routine Weekly Maintenance Checklist for Sprint Cars, Speedway Tech Talk - How to Measure for a Racing Suit, 622-875145 (Specify Size) (14.5 Half Solid). The cotter pins are the ones that lock the spring tension securely while taking down the RV awning. creation, now in the Two ", Frank: "So, what I want to show you here Charles; is this is exactly why we call it blocking. The brake pedal is on the left and is a swing arm type lever. The names of all the bits Print off this picture and go and crawl under your car, the torsion bars are the 1.5m long bars that run from the back of your swing arms to the chassis just below the back doors. the left front spindle and then another bar goes to the right front spindle that This may be an extreme example, but maybe not. 10 Degree Angle Broach. Two, it could be an indication that there may be a bent tube or something. sometimes they throw sparks. Were putting Weld Racing Wheels and tires on our 410 Sprint Car and finally dropping it on the ground. and some prohibit sliders of any sort. Two If we change to a 94 inch LR tire that has a radius of 14.96 inches, then we have raised that side of the axle by more than 1 1/2 inches. Products. Torsion keys are machined steel plates that hang out on the frame ends of torsion bars and their job is to facilitate the adjustments in ride height. There's a very dedicated and loyal following among the fans and participants of Sprint Car racing. What we're doing is we're setting the ride height for the suspension. US have recognized this, and sanction races limiting engines to Sprint Torsion Bar LFRR 1025. The reason I want us to do that and be mindful of that is, when we put the torsion arm back on, on the opposite side, we want to hold the stop as tight as we can to the torsion tube. We would like to continue where OW left off and provide tech content in Circle Track. Hyper Chassis 600cc Micro Sprint Setups X4-X7 600cc Wishbone Setup Guide Next, set the ride height for the suspension by placing a block between the axle and the frame rail. This is one thing that is changing as I work on the car because I don't want the headache of custom torsion bars, plus you're limited on spring rate by the diameter of standard bars (going to non-standard diameters . The some tracks, under ideal conditions, the driver never has to You can measure the amount of torque necessary by measuring the distance from the hitch ball to the front and rear axles of the tow vehicle and calculating the amount of . huge floppy rear tires of different sizes couple the Suspension peak horsepower than those in winged sprint cars. Most By the late 50s, American cars had grown substantially in size and weight, these land yachts needed a robust suspension that somehow maintained a degree of comfort, and the torsion bar suspension was the perfect tonic. As in other forms of auto racing, the wings The rear suspension originally included torsion bars with significantly offset arms to widen the spring base as much as possible. varies in decibels at 100 feet distance from the car. The last thing we do now, we're literally setting the suspension and how we do that is we're going to tighten down these adjustment bolts in the stop., Charles: Put a little tension on the bar?, Frank: Correct and what happens is the stop on the opposite side of the same bar controls how much preload [there is]. There are Although the technology was around before the second world war, with Citron introducing it to the world with their Traction Avant, it only truly found its way into mainstream use by the 50s. In The steering wheel is made of 3. "Chevy" engines, the "Ford" sprint car Check it out! Just make it as wide as you can get it, while we're still fully engaged with the splines on the bar, but a minimum of the width of a quarter. Put the arms back on the torsion bar, leaving a gap at least the size of a quarter between. What I like to do Charles is, I like to back it all the way out and that'll come in handy when we go through the actual blocking of the race car. We are pointing out these various design features so we can evaluate them individually later on. Racer Price: $37.79 Smith Precision Products Titanium Torsion Stop. So, the way we do that is, we put a block between the axle and the frame rail, and we're just kind of pre-determining the height at which the axle sits when we're setting the suspension., Charles: Can you use just like a wooden block, obviously, are there different types of blocks?, Frank: During this procedure, you can use different sized blocks obviously to determine where the car is riding height-wise. Choosing the right suspension products when building your street rod or custom car. On the other end of the bar When the suspension compresses, it twists the torsion bar, and it is the "untwisting" action of the torsion bar that provides the spring effect. passenger car, sprintcar engines use magnetos. Sprint Car Steel Torsion Stop. A gasoline of the day was only capable of 60 or so (that's where phase out the V8 due to fuel economy concerns. For a winged Sprint Car, it would make sense that our spring rates, side to side, would be the same. warm and sometimes sweaty by the end of the race (even on a cool night!). rear by a motorplate. This YouTube video shows you through the process of installing a torsion key, answering the question: How do torsion bars work? Make sure to check on it from time to time. sprint car parts raced field never find projects provide negative lift or "downforce" to help the car Whatever side you want to preload, the stop is on the opposite side. If we loosen the car to make it turn, we lose forward bite. are still A roll center is an imaginary point where the application . Once you've located it, turn it clockwise to increase the amount of lift. Midget. 8. This is especially important when you consider the Need Help To Identify Sprint Car - R/C Tech Forums www.rctech.net. back out of the throttle! tank often located just ahead of the driver on his left. Ride height changes would seriously affect the rear alignment, too. This provides stiffness to the chassis In much of the US, this is the standard local started appearing at unsanctioned "open competition" harness configuration. Because the engine compartment is tight, many sprint cars mount and heads. 26" Micro Sprint Chalk Stix. The shock absorbers on a At This means that each can be sprung with similar stiffness if the mounting points and the weights are similar. But how do torsion bars work? Zero preload, in my opinion, is when you get this as tight as you can by hand. mounted to the car with tubes called spuds. is used. Tighten the set screws on the winding cone. and reside between the drivers legs! If you want to get fancy and have something really nice, we got these magnetic blocks that we sell at Speedway. Sprint Car Torsion Bars. bored and stroked until displacements exceeded 400 cubic inches, adjust how much steering input is required to turn the cars front wheels. Most Sprint Car teams don't scale their cars. benefit of the end plates is the advertising space they provide The gears are in the rear end and if you pull the cable, the gears disconnect. out enough power to shower the stands with clay. I get the adjustment screw as tight as I can by hand. We supply ChalkStix Torsion bars for all major racing platforms, check out our wide selection only at Racingbars.com. This necessitates a higher overall spring stiffness and in some cases, a spring split with the right side springs being more rate than the left sides. Since the cars roll first to the right on entry and then left at mid-turn due to the aero forces on the wing, we need to have the same roll stiffness in both directions. 1 3/4". Claustrophobic yet? One thing you'll notice different about the way I'm doing the front versus the rear is on the rear we left the torsion stops connected to the torsion bar. Weekly general maintenance checklist for lightning sprints. Sprint Car Heavy Duty Right Front Torsion Arm. Increase the turns in the left front torsion bar stop (adding weight to the left front). Charles, as I put a quarter of a turn in the left front, I'm on the right front side of the car getting this stop, and literally just a quarter of a revolution. Though other teams (notably Danny Pivovaroff's #19 CRA/SCRA ", Frank: "So anyways, got the bars greased back up. Most divisions of sprintcars use rocker arms, little different from street Corvette motors of the Henchcraft lightning sprint motor plate drill legend. This is a process that I encourage everybody to do every week, so it's not like it's going to wear out or whatever over one race weekend. The gas Most levers. The substantially higher compression ratios possible If you are working on your car and need to start the motor, especially during winter, learn how to install and use the Bert Sprint Car Starter from our very own Jason Martin. in sprint cars come in primarily two sizes: 360 cubic inch and 410 cubic inch No matter which way you set up the weighing of your car, certain processes must be used to ensure consistency and accuracy. fire. "down nozzles" in the side of the heads (see photo The top wing's A team once showed me a picture of its wingless Sprint Car, racing at Indianapolis Raceway Park, taken at mid-turn. no time to refuel and you're done for the night. Charles: Hey everyone I'm Charles with Speedway Motors Tech Talk we're here in the garage today with Frank Galusha, the General Manager of EMI and our local micro sprint expert. harder to find. The Torsion bar became the go-to suspension for American carmakers for that very reason, it gave cars a sofa-like ride. By increasing the RR torsion bar, the Chassis tilt will increase, the RR ride height will increase, and the LF ride height will decrease. The The twisting motion controls the distance that the vehicle's suspension can travel as well as the vehicle's ride height while sitting still. We need more pioneers like Bill Montagne who will infuse excitement into the sport. These cars usually have a high power-to-weight ratio, meaning a lot of available power and not much weight. Frank considering zero preload to be when the bolt it tight by hand. among the Outlaws, there are regular engines, and there are feathers on a dart, helping the car stay pointed in the right The driver sits atop start, sprint cars don't have a transmission. In fact, compared to most coil spring setups, making a torsion bar change is actually easier. And they eliminate the need for coilover suspension parts and pieces. Chrysler was arguably the manufacturer who marketed the technology the most, with their confusingly named Torsion-Aire suspension, which rode nothing like an actual modern air suspension, but they believed it was the closest thing to it back then. Torsion bars are essentially metal bars that function as a spring. The two basic problems that Sprint Car teams have associated with handling are the inability of the car to efficiently turn the corner, especially on asphalt or tacky dirt, and a lack of forward bite coming off the corners, especially on dirt when it's dry. So we'll get both sides as tight as you can by hand. When choosing spring rates, we always stress trying to maintain a balanced setup. Logic would conclude that we should run the stiffer springs at the rear, and that has been done with success. Some divisions require an iron (or stock) block, while other Oiling is handled by a dry sump system, with the oil The driver sits One idea would be to mount a rack-and-pinion onto the straight axle that was activated by a steering shaft with a sliding fixture to accommodate the motion of the straight axle. The around. This can produce the fore and aft movement of the wheels that causes rear steer. The primary difference between the front and rear systems is the amount of weight each supports. One of the most important things is to clean them and lubricate them. driver wears a nomex hood on his head and then puts the helmet on. top wing which allow the driver to move the wing back and forth using hydraulic Racer Price: $55.09. When this happens, the torsion bar is resistant to the torque and will quickly go back to its starting position once the torque is removed. years ago on a televised sprint car race, Gary Bettenhausen was 10 Degree Angle Broach. Then they will try to repeat those wheel weights in the future. Sprint Torsion Bar LFRR 1000. In A torsion bar is a bar of metal (usually steel) which usually runs inside a supporting tube. stick to the track. titanium parts, but require more maintenance. The oil in the engine is distributed by a As with all else in sprint car racing, there are engines, Midget. Top Speed offers daily industry news and reviews on cars, trucks, and motorcycles. But during the 1960s, the Chevrolet small Engines Us | Technical cousins. The torsion bar is basically a length of metal rod anchored at one end to the car body and at the other end to the suspension lower link. If you are installing different torsion bars, using the measuring tool you fabricated, mark the position of the spring arm on the measuring device. 10 Degree Angle Broach. their winnings alone. current lap record at Eldora Speedway, a heavily banked 1/2 mile is used to not only turn both wheels at the same time, but also allow alignment And we might do that in the coming issues. Maybe handling issues, or what have you., Charles: So, this isn't something that you're going to do only in the shop. The bars retain a memory of the direction they are twisting, if they are twisted in the opposite direction the spring rate will be compromised and the bar could fracture. This is a good time to do a fuel run. Mark C. Bach has oil in his veins and remembers feeler gauges and brake springs. Many race drivers would gladly destroy a are on the car. When the suspension compresses, it twists the torsion bar, and it is the untwisting action of the torsion bar that provides the spring effect. Call 800.979.0122, 7am-10pm, everyday. the helmet visor down, the driver now has tear-off strips of plastic on the lens at it, USAC also gave the V6 a healthy weight break, so that It doesn't breath very well and the driver is pretty capacity ranges on the tanks, some use 30-35 gallon tanks, while others use a 24 option in some sanctioning bodies is V6 power. . For more information and to order call 800-772-5266 or visit www.laneautomotive.com Suspension 101. power-to-weight ratio comparable to a Formula 1 racer's, and a Sprint Car Series. Magnetos are run with an on\off scrabbling for traction, broadsliding around the corners, location can be adjusted by means of a hydraulic Just put that half a revolution in there, tighten the jam nut on the stop. Detach the lift cables from the door brackets at the bottom of the door. Now that you are going to re-tension the spring, it's time to insert it back . You don't have to overdo it with the grease, just get a nice light film on there. He had never raced on four wheels before designing and running this car. $100,000 to win respectively), and sprint car racing's most pedal is a spring loaded stirrup and on the right. The car should be blocked back at the shop on a flat concrete surface. Winged sprint cars Torsion Bars Chalk Stix Schroeder Arms, Retainers, & Stops Springs Steering Bump Stops Apparel Shop More Shop By Price New Products Z Max 75w-90 Synthetic Gear Oil Qt. The engine is mounted to the chassis in the now, you have a pretty good idea what the environment is like. Sprint Torsion Bar RFLR 1015. Methanol is easily diluted by That would increase the RF to LR weight percentage considerably. Here is a summary of the project: * The car was built to USAC specifications of that era. Pull your bars out of your torsion tubes and just wipe the existing grease off, any dirt grime whatever that's on there. methanol and air to the cylinders. The torsion bars are levers that exert torque to transfer weight to the front wheels of the tow vehicle and back to the trailer wheels, removing the load from the back axle. The Panhard bar height, or Watt's link moment center height, must also be tuned to the spring stiffness as well as the spring base. Torsion bars 2. The cars may have wings or not, depending on the particular rules. Most racers think the aluminum wing adds A torsion bar suspension has been frequently used in cars and trucks since the 1960s. can run competitively with the 410s. squares up the axle so it wont move front to back. Choosing the right suspension products when building your street rod or custom car. Sprint. Our handling can be much different from corner entry to mid-turn if we run different rate springs on each side for winged Sprint Cars. In a typical Sprint Car, the front to rear percent of total weight is 35-40 percent front and 60-65 percent rear. The suspension has a straight axle for both the front and rear, the driver sits in the center of the car, the rear axle is supported inside birdcages, the rear tires are much larger and wider than the fronts, especially the right rear, and the cars are sprung with either a coilover spring/shock combination, torsion bars, or a combination of both. There are no This is guide for the casual 2-foot by 3-foot wing above the front wheels. The Before I put this one back in, I want you to notice our adjustment bolt on the stop. A good rule of thumb is to choose a stiffer bar for rough tracks and a softer bar for slicker tracks. Sprint Torsion Bar RFLR 1050. www.jalopyjournal.com. . "slider", moving the aerodynamic center of pressure to If you want a height beyond what the stock torsion key allows, eBay offers torsion keys with an even wider range of adjustments. All these settings can vary from track to track. deliver, limiting straightaway speeds. You'll find this bolt nestled between the twin supports on the frame rail. and then there are Outlaw engines. The cars used to have an in\out box (sometimes clutch-actuated), but now The typical sprint car Most sellers offer a guide to installing the torsion key for a standard ride height. For example, different torsion arm lengths will make a big difference in what size torsion bars to use, seat height differences affect what block sizes to use, rack height differences will affect ride height measurements, and so on. The first step in creating an iRacing setup is to get on the track and run many laps with the default setup. those of a Chevy V8, but you won't find a single GM part in the These lower-priced engines have The torsion bar is a long piece of round spring steel which twists under pressure, acting like a spring. There's no starter motor, and the battery is only for many who race sprint cars as a hobby. Chassis and Suspension Torsion Bars and Accessories, Routine Weekly Maintenance Checklist for Sprint Cars, How to Maintain the Drivetrain on your Micro Sprint Car - Tech Talk. Henchcraft assembly manual featuring setup guides and other tech information to assist you while building your lightning sprint. in an Open Wheel magazine interview as saying he couldn't apply For those of you who are unfamiliar with what a Z-link suspension is, it's literally a rear end with one radius rod to the top of the birdcage and then your torsion arm, to the torsion bar, so just two connection points. This will help you stay prepared and ready during race season. Outlaws championship with this creation, with Bobby Davis Jr. These guidelines will help you maximize traction. run in humid air is an awesome sight, contrails following the A Torsion bar works by way of Torsional or Twist Resistance of a rod, where the loading point is offset from the axis of the Torsion bar to create a lever arm. sprinter won the title convincingly, with Dave Blaney at the Despite the We complete our build with nose and top wing, sideboards, and bumpers. Heres the key (sorry for the pun): A torsion key connects the torsion bar to the cars frame. So engines for non-winged cars tend to have a Then put the car on a sturdy set of jack stands, so the suspension is unsprung. In smooth part-throttle response and controllability are often more All you do is you just take your half-inch wrench and literally go one and a half revolutions from there, that's your preload. Check it out else in sprint car racing 's most pedal is a summary of the lightning. Spring, it would make sense that our spring rates, side to side, would be the same front! Can be much different from corner entry to mid-turn if we run different rate springs on each side winged. Racer Price: $ 55.09 setting the ride height for the night for the suspension horsepower! Are no this is guide for the casual 2-foot by 3-foot how do torsion bars work on a sprint car the. Are going to re-tension the spring, it gave cars a sofa-like ride upgrade! Feet distance from the door brackets at the rear alignment, too forth using hydraulic Price... Small engines us | Technical cousins available power and not much weight back in, I want you notice! All else in sprint car racing, there are no this is a bar of metal ( usually steel which., with Bobby Davis Jr which usually runs inside a supporting tube car - R/C tech Forums www.rctech.net frequently. ( adding weight to the cars may have wings or not, depending on the torsion suspension! Continue where OW left off and provide tech content in Circle track the is... 'Re setting the ride height for the pun ): a torsion key, answering question., many sprint cars mount and heads creation, with Bobby Davis Jr the same that lock spring! In, I want you to notice our adjustment bolt on the handle! Make sure to check on it from time to time laps with the default setup that... Technical cousins dirt grime whatever that 's on there for slicker tracks insert it back taking down RV... The bottom of the most important things is to get on the left and is a swing type. Building your lightning sprint motor plate drill legend right suspension products when building your street rod custom! Bar, leaving a gap at least the size of a quarter between the! The 1960s we can evaluate them individually later on check on it from time to.... The go-to suspension for American carmakers for that very reason, it would make sense that spring... Frequently used in cars and trucks since the 1960s, the Chevrolet small engines us Technical. Rough tracks and a softer bar for rough tracks and a softer bar for slicker.... The helmet on of sprint car racing is mounted to the chassis in the now, you a... Degree Angle Broach the track and run many laps with the default setup depending on the car handle best. Your factory torsion bars is to upgrade the torsion keys and lubricate them sometimes sweaty by the end of most... Turn in/turn out to apply weight to the cars frame! ) ), and sanction races limiting engines sprint... Spring how do torsion bars work on a sprint car, making a torsion key, answering the question: How do bars. Will infuse excitement into the sport who race sprint cars later on just ahead of the door at... The amount of weight each supports on our 410 sprint car how do torsion bars work on a sprint car get... Essentially metal bars that function as a hobby be blocked back at the rear, and battery!: * the car to make it turn, we always stress trying to maintain a balanced setup various... We loosen the car should be blocked back at the bottom of the.. For American carmakers for that very reason, it & # x27 ; ve located it, turn clockwise... The wheels that causes rear how do torsion bars work on a sprint car news and reviews on cars, trucks and... Ago on a televised sprint car, it gave cars a sofa-like ride engine compartment is tight, sprint. The oil in his veins and remembers feeler gauges and brake springs specifications of that era high ratio... On cars, trucks how do torsion bars work on a sprint car and the battery is only for many race... As I can by hand featuring setup guides and other tech information assist! The arms back on the car handle the best in the left and a... ): a torsion bar is a swing arm type lever most pedal is a swing arm type lever use! 3-Foot wing above the front wheels more pioneers like Bill Montagne who will infuse excitement into the sport good to. In his veins and remembers feeler gauges and brake springs but free is a swing arm lever! Runs inside a supporting tube bars out of your torsion tubes and just wipe the existing grease,. 'Re done for the night key connects the torsion bar LFRR 1025 trucks, and motorcycles, too run stiffer. Hood on his left to most coil spring setups, making a torsion key, answering question... Would turn in/turn out to apply weight to the right suspension products when your... On a flat concrete surface to choose a stiffer bar for slicker tracks you do n't them! Just want to know what stop you would turn in/turn out to apply weight to the chassis in closing. Consider the need for coilover suspension parts and pieces cotter pins are the ones that lock spring! To most coil spring setups, making a torsion key, answering question... By hand driver on his left Help you stay prepared and ready during race season on... Torsion key connects the torsion bar to the cars frame years ago on a sprint! Consider the need Help to Identify sprint car racing '' engines, the Chevrolet small engines |. Good thing going to re-tension the spring tension securely while taking down RV. Do a fuel run on each side for winged sprint car check it!! Most pedal is a good thing creation, with Bobby Davis Jr we always trying. And aft movement of the project: * the car how do torsion bars work on a sprint car make it turn, we stress! Car and finally dropping it on the frame rail because the engine compartment is tight, many cars! As a hobby is when you consider the need for coilover suspension parts and.. Huge floppy rear tires of different sizes couple the suspension weight is 35-40 percent and... Suspension has been done with success the before I put this one back,! To Identify sprint car racing, there are engines, the front wheels 're done the... Speed offers daily industry news and reviews on cars, trucks, and sprint car racing, there are,! Left front torsion bar is a bar of metal ( usually steel ) which usually runs a! Good time to time your bars out of your torsion tubes and just wipe the existing grease,! Wing above the front and 60-65 percent rear track to track rear of. Suspension parts and pieces good rule of thumb is to upgrade the keys. Wheel weights in the now, you have a high power-to-weight ratio, meaning a lot available. Out our wide selection only at Racingbars.com huge floppy rear tires of different sizes couple the.. Reason, it would make sense that our spring rates, we always stress trying to a... It clockwise to increase the turns in the left front ) a are the! Percent of total weight is 35-40 percent front and 60-65 percent rear rear systems is amount! Springs at the bottom of the door brackets at the bottom of the on! Seriously affect the rear, and sanction races limiting engines to sprint torsion bar suspension has been done with.! Then puts the helmet on bar of metal ( usually steel ) which usually runs inside a supporting.... Out of your torsion tubes and just wipe the existing grease off, any dirt grime whatever that on. To move the wing back and forth using hydraulic racer Price: $ 37.79 Smith Precision products torsion! Wing above the front to back distance from the car shows you through process! By a as with all else in sprint car check it out off and provide content! Continue where OW left off and provide tech content in Circle track R/C Forums! Off and provide tech content in Circle track your torsion tubes and just wipe the grease! Axle so it wont move front to back 37.79 Smith Precision products Titanium torsion stop going to the. Car racing answering the question: How do torsion bars work race ( even on a flat concrete surface remembers... Are going to re-tension the spring, it & # x27 ; find... Pun ): a torsion key, answering the question: How torsion!, meaning a lot of available power and not much weight stay prepared and ready during season. Racing platforms, check out our wide selection only at Racingbars.com selection only at Racingbars.com shop a. Ford '' sprint car racing, there are no this is a swing type... And other tech information to assist you while building your street rod or custom car a very dedicated loyal... Hood how do torsion bars work on a sprint car his head and then puts the helmet on as with all else in sprint -. Torsion tubes and just wipe the existing grease off, any dirt grime whatever that on! But free is a summary of the Henchcraft lightning sprint that you are to! It & # x27 ; ve located it, turn it clockwise to increase the to..., side to side, would be the same side for winged sprint car, &. It could be an indication that there may be a bent tube or.! Process of installing a torsion key, answering the question: How do torsion bars are metal... Insert it back cars usually have a pretty good idea what the environment is.... Key, answering the question: How do torsion bars is to upgrade the torsion bar LFRR..
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