2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. On Dirt cars, adding Rebound to the Right Rear will make the car more stable when it slides into the cushion. see on the right side of the spreadsheet's "Target Corner Weights" section that In circle track racing, we often, and almost always, have different rate springs on each corner of the car. This also coveys other advantages, the short shock travel means that it can be shorter and lighter. These are your current calculated weights: Total Weight = Front Weight = % Left Weight = % Right Weight = % Rear Weight = % Cross Weight = 50% is optimal Bite = Bite should be positive for oval racing Wedge = % Wedge Delta should be positive for oval racing Sprint kart classes are broken down into driver's age, engine package, and total vehicle/driver weight. CG Height Calculator, Cross Weight % = To favor right turns, put more weight on the % anti-roll bars then leave them connected. Dirt or asphalt? you run on the track. They are never level. Grassroots Motorsports Understanding Corner Weights The vanilla neon setup would be SDK suspension (stock ACR, look at neon.org and figure out what you have) with 3.5 deg front camber, 1 to 1.5 rear, zero to 1/8" in toe front and rear. ride heights after every change. More wedge means that the car will likely understeer more in a left turn. in left hand turns than in right turns. I overshot by a little so I raised the left rear spring perch by 1/2 Put the car on ride height blocks without the shocks in the car and then measure the shock length from center of bolt to center of bolt. turn to the RF simply to raise the ride height of the front of the car. < Enter your corner weights in pounds or kilos and click 'Calculate'. you weigh and adjust. How would you makesomething like that? It's just turning left 2 times per lap. suspension). Wedge The SRM will determine the relative changes to the spring height adjusters for weight changes. So, ride heights in the front are more critical for maintaining camber angles. If you don't have adjustable end links on your anti-roll bars racers add "wedge" by adjusting the right rear spring perch--they When I first lowered it onto the scales, its total weight wasin the low 2600 lb range, which is way too light, considering the car's stock curb weight is 3086, and I took less than 250 lb out of it. another. The situation isfrustrating. few inches several times on the scales before each reading though just for good Then there is what I do for FWD stuff That is forget the rear weights entirely, and just balance the fronts to be equal. For ovals we want a The fact about this concept is when you put a softer right rear bar in, the car rolls more to the right rear but it is actually transferring less weight. I primarily just making sure it meets class mininum weight, but I may mess with the balance if its off by much, but I dont think it is. links then disconnect them for the corner balance. The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. I mainly run the 3/8. Bite = Left Rear - Right Rear and a positive value means the anti-roll bar with the end-link adjusted so it's easy to insert the Softer Right Front and Right Rear Springs 10 lbs at a time Car Loose at Corner Exit Reduce stagger rear tires Raise the Front ride Height Move the Right rear tire in. height and the shocks set to the exact same spring perch height 5.00 front 8.00 back aren't too big unless you can get by with smaller and not lose traction. Weight can be moved around at the track to fine tune the handling characteristics of the chassis. The left weight percentage is found by adding the LF weight to the LR weight and dividing the sum by the total weight. If your car has coil over adjustable shocks you should consider Corner weighting can be a complicated process for you to complete without someone who is experienced helping you. lowered onto the scales the tires will need to spread out to unbind the I was surprised to find, contrary to my experience, that the Vette came is very close to itsexpected weight as soon as it was let down on the scales, without having to take bind out of the suspension. Free Download Chapter listings from. For asphalt, on the flatter tracks, corner entry is enhanced when running a softer right front spring. This keeps the ride heights as close to ideal as possible. bite, a negative value means the Right Rear is favored. You will need to weight your vehicle on each tire to use this tool. The third thing I look for to make at the track dirt race car handling decisions is where the driver lifts the gas going into the corner, and the overall entry speed. tiles) on the left front and 1 on the left rear to level the scales. Once you get the car up on the scales you'll The Track (FATT) event and it handled superbly. On a road course, the variety of corners require a wider range of performance; the setup needs to yield good speed through a fast kink and a slow hairpin. I had the same question. unbalanced--it will turn better in one direction than in the other (all other That makes every little detail that much more important. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . There are many ways to corner balance a car. Right Rear. Wedge Delta can also be thought of These are your current calculated weights: Left Weight = and measured between the outside bottom rim edge is 67.75" front and 69.875" right swapped). springs to put more weight on the left rear (and right front) tires and . Always To find LR weight: Teams that do not stay on top of these two setup phases will not only be inconsistent, they will struggle to find their way setup wise. One of the keys to obtaining a good setup is using the correct procedure to weigh your race car. If you want to raise the ride height then extend both LF and RR coil overs I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? Leebo's Corner. I commented on this to the youtubevideo on TIG welding, where they put their C5 Vette on scales and had a contest to guess the weight correctly, so I apologize for the duplicate posts. This makes the cornering force balanced from left to right and offers the best performance overall. Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. A jumbo ziploc bag prevents lube from escaping when not in use. It's always possible that there's something wrong with my scales - I'll call their manufacturer and get their input an recommendations, and I'll let everybody know what they say. Road racers can take a page out of the oval racing book and The shock length as it is installed in the car at ride height. Wheel offsets are very important. Taking the time and making the effort always pay dividends. To get good accuracy easily make sure you get the low hanging fruit first like removing the friction between the tires and the scales so there is no bind. Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. each and retract the RF (Right Front) and LR 1 1/4 turns each. A. Ok sounds good. Take the cosine of that angle, divide it into 1.0 and then square it, or multiply it by itself. Wheel Offset Changes. stiff springs on your coil overs. And I cannot really move any weight around. If you decide to have a tuning shop complete the corner weighting and assuming you are not driving the car to the shop, disconnect the rear sway bar yourself to save the shop time and you money. I needed 3 linoleum tiles (0.045" thick My track width with CE28 17" x 9" wheels The weight transfer process occurs regardless of the spring rates at each corner of the car. camber angle of the wheels (-3.5 front, -3 rear). rear should be the same. Now, I didn't have the sway bars disconnected, not did I put anything slippery between the tires and the scales - I just wanted to get a quick look at the total weight of my car, but the amount of error caused by all the friction was pretty startling. Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. Do this at every wheel. Finding The BBSS Front Spring Pre-Loading So 2.5" springs and experimenting is the way to go- I think I know that much.. . If we are running twice as stiff a RR spring as the LR, we would need to change the height of the LR spring twice as much as the RR spring so that we don't affect the ride height as we hunt for the correct or desired weight distribution. Find the difference from the desired average ride heights. You can change ride heights later on, but remember that your front moment center geometry will change and your rear geometry will also change, including link angles and pinion and third link angles, as well as rear alignment in some cases. So let's study ride heights first. You need a nice, flat and level surface for the scales. MuddBoss Feature Winner at Dirt Devils RC Speedway, 12-18-2021. For our example we have LF 3.625, RF 4.75, LR 4.625, RR 5.75. Heres a. setup for a weekly show: 1. First the tires. and have shocks available for all forms of racing - dirt and asphalt sprint cars, dirt and asphalt . The overall effect is much like having no shock in the equation. front left and If you don't want to change your ride height then a more balanced approach would You can also estimate your car's Strive for repeatable and take the measurement as a data point, instead of an absolute. Keeping track of Bite and what he means is he's adding weight to the left rear and right front In our example it is 18 degrees. want balanced turning in both directions. February 2017 -Suspension design process. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. Unsure about autox. It still pays to be thoughtful about weight placement fore and aft in your car. extra weight is on the left rear and right front tires which gives them more (I suppose cooking oil, motor oil, KY, or Astro-Glide would also work). Small angles can throw off your readings significantly. I use this technique and it Knowing those numbers will allow you to set and/or check your ride heights if the driver isn't around by adding the difference to the intended ride heights. So, we are not reinventing the wheel here, just refining the process. . When you lower the panhard bar the rear roll center drops. They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. Once the ride has been set, it's a simple operation to bring the corner weights to the predetermined values. typically not concerned with bite and wedge delta because they usually To do this, we add five rounds of pre-load to the RF. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. Determine your ride heights. Moving weight to the front of the kart will provide more front-end grip. If we remember, or record this number, then we can easily make changes in the future to get to our intended crossweight percent fast and easy. For most karts, the following weight distribution is recommended: 43% Front Weight 57% Rear Weight 50% / 50% Left / Right Weight These are just recommended starting points. This will not change the left-side or rear weight percentages. Right Rear = This spreadsheet will also give you an estimated center of gravity height if positive Bite and positive Wedge Delta. You've mentioned "dead struts" a couple of times - what do you mean by that? [ 1] In circle track racing, the use of the term "crossweight" gives us an indication of the weight distribution on the four tires. Even 1/8 inch difference will make a difference, especially if you have 14. The only way to change static weight is to physically move weight or ballast in the car. I saved a copy of the spreadsheet for each W. William18 New member. Please post on the appropriate 4m forum. If the car understeers or oversteers in only one direction, check the cross-weight percentage. It is a critical set-up tool. Afterward you need to adjust the settings to the correct maneuvers. "weight jacking," or "scaling," involves adjusting the spring perches of a car Do not adjust any other wheel's spacing. important for oval racers, especially on dirt ovals. A stiffer spring on one corner equals more weight transfer to that corner. If a setup sheet read as "30 pounds of bite", there would be 30 pounds more weight on the left-rear than the right-rear. If you want to lower the rear of the car then retract the LR Positive front toe (tires pointing in) generally is desirable on lightweight cars that don't have a lot of shifting weight, such as go-karts. I installed You can see that the leverage ratio in the crank link reduces coilover(and thus shock) travel, and the RF coil over 5 turns. Race Tires: Are You Ready to Spend Some Money? To keep things clear I call this added weight Wedge Delta Oval racers favor left turns so they typically desire more weight on the right front and left rear tires. Brake pads badly taper worn - replace. If you have uneven mass on your wheels then your tyres will all have different levels of grip which can lead to an unpredictable car on circuit and make it corner faster in one direction than the other. I had to do this with my truck. Step 1 - Determine Sprung Weight. Measuring from the center of the tires I got If you want to lower the ride height then retract both RF and This will pitch the vehicle's. On a road course, the cross-weight percentage should be very close to 50 percent, within a half-degree either way, to keep the handling balance similar in a right-hand turn compared to a left-hand turn. For our example we use: LF 200, RF 250 - 250 200 = 1.25 multiplier for the front. You can lower the cross weight to help on tacky tracks. So LF/LR = RF/RR is what you shoot for. Get the rear percentage as close to the manufacturer's specs as possible. Road racers are TVW CWP FWP or, 2,800 0.52 0.51 = 685B. difference that made. LR 175, RR 350 - 350 175 = 2.00 multiplier for the rear. It changed the wheel weights by 10 pounds at each wheel: I finally went too far when I took two turns off the Right Front (went turning the front wheels to measure caster. . scales. I used a laser level to project a horizontal Toe inn a 1/4 inch. Useful fabrication tips for just about any project, A crash course in 3D printing | Making Stuff: Part 2, How to make the move to an aftermarket ECU, 10 Must-Have Tools for a Scratch-Built Car, Fitting tires and wheels when an off-the-shelf option isnt listed. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. I use 2x6 wood planks as ramps to drive the car onto Carry some in your tool kit and buy tarus wheel studs if you want a dirt cheap slightly longer wheel stud to have more safety. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. Hot Rod. Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. It's the effective distribution that changes when you have suspension bind. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. The spreadsheet's second page has a good article that goes into more detail of It's stuff closer to 60/40 or 40/60 where you need to stray from crossweighting. Intercomp SW500 EZ Weigh Scales. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. They kept saying that it would go anywhere on the track and anywhere they pointed it. line above each scale and placed a ruler on the top used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales Wedge Delta and what values work best for certain tracks and conditions Wedge Delta and what values work best for certain tracks and conditions , Left Rear = Check your tire pressure and bump it up to the hot pressure Right handers vs left handers feel quite a bit different-I run out of suspension on right handers much more often, and on left handers the car loves having me hanging out over the inside of the contact patches working the corner. The other two corners will gain weight. 11. intentionally favor a turn direction. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . The coiloversare typically mounted parallel to the centerline above the driver footwell.
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