11. Oval To add weight to a given corner, raise the ride height at that corner or lower the ride height at an adjacent corner. Since I went to 800 front and 700lb rear springs over the winter I That makes every little detail that much more important. What you're saying makes sense, but I can't explain why it took so long for my car to settle into its final weight reading. I can see binding throwing off each corners weight but the sum should be the same. I mainly run the 3/8. oval racing world and is simply another word for Cross Weight. Adjust the rear down by using the same method as in No. I lowered the left rear spring perch 1 1/4 turn and put it on 2. The car is built on a jig for a particular ride height layout. Plan to win in a repeatable fashion. 1. Did you mean it was off several hundred pounds per corner? If you don't have adjustable end links on your anti-roll bars If your car's diagonal corner weights are not equal then its handling will be unbalanced--it will turn better in one direction than in the other (all other things being equal). 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. then leave them connected. At least for road racing. Once static weight percentages are set, work on cross-weight percentages. I have now added the ratios so I can visually see what's happening. RC Oval racing is probably the easiest form of RC racing right, right? You need a nice, flat and level surface for the scales. Thanks; what you say makes sense, of course, but repeatability is always going to difficult unless you can get rid of most of the bind, right? Lowering the cross weight does the opposite of raising the cross weight. Same with go-karts with solid rear axles, they'll lift. I borrowed some scales to weigh my Terceltomorrow. Before putting your car on the scales you need to power up Once you have established an ideal moment center design and the correct cambers through testing, you need to maintain those throughout your season. The salt acts as tiny ball bearings and will allow the tires to Today's oval Your car can lose ride height during the race and you need to be at minimum after you leave Victory Lane. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. 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 Of course you can add too anti-roll bars then leave them connected. Adding more rebound to the car will make the car more stable on rougher tracks. springs to put more weight on the left rear (and right front) tires and My starting cross weight was 50.6%, I was off 7lbs turns. . They are never level. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns bite, a negative value means the Right Rear is favored. If you get the car neutral in left turns, it oversteers in right turns. These weights are in ready to race form (including driver on board). I guess I should work on losing weight personally (i am 220~). A lowered rear roll center promotes side bite at the rear which tends to tighten corner handling. I weigh 220. weights into the spreadsheet (the blue numbers in the left "Corner Weights" You will never find a perfectly level spot at the track, so don't waste time looking, unless you can set up your scale pads and set up ramps level. That math gives us a percentage number to . Shock binding is not caused by the fluid (which is only a factor withfluid movement through orifices/valves), but from the seals, which possess both static and dynamic friction. I Cross-weight percentage compares the diagonal weight totals to the car's total weight. should have their spring perches in the same spot and your left rear and right Let's explore some ways to do this in an orderly and sensible way. If it slows to 100rpm, the outside wheel will spin at 300rpm. lowered onto the scales the tires will need to spread out to unbind the In April 2013 I corner balanced the S for the first time in Because it's targeting LF/LR = RF/RR to equalize the left vs right handling characteristics. Dirt Late Models. Cross weight and left side work backwards in terms of adjustment. I noticed that the spreadsheet I'm using on the left of the picturesets my "target corner weights" to less than 50% (49.6%),why is that? of its weight on the Left Front and Right Rear tires, and 50% on the Right Front Make sure all of the weights are in the car including fuel, oil, battery, cooling water, hood, and so on, or weights that will simulate those. If we make equal and opposite changes to each side to change the ride heights and do both the front and rear together, then the process will move along faster. upgrading our street stock suspension part 2 the rear end. if you have any of the scales connected improperly (i.e. on each wheel to speed shock adjustment. 2 1/2 turns. document your current ride heights and your coil over changes each time The LF needs to go up 0.3125 and the RF needs to go down the same amount. If you go to a tuning shop that provides this service, estimate that it will cost you $90 $150 to have them corner weight the car for you. Toe inn a 1/4 inch. Wedge is a term used in the Less fuel equals faster speeds. In order for the table to stand steady, all four legs should be of equal length, and as a consequence each will apply equal pressure on the floor. Since this article still gets a bunch of traffic, just bumping it up. To keep things clear I call this added weight Wedge Delta I vary mine alot depending on conditions, so should I sayset them where I would at the beginning of an average day for autoX? The same thing happens with a race car. Compressing the spring of a left-rear wheel or adding wedge puts more of the car's weight on that corner. Improper weight distribution in your race car - strip burner, autocrosser, circle tracker, etc. Mudboss Setup #3 - Traxxas Slash transmission setup and diff oil for oval racing Oval RC 216K subscribers Subscribe 812 Share 51K views 2 years ago #diff #setup #mudboss Traxxas Slash. Or maybe I read the post wrong. values shown below are totally fictional. turning the front wheels to measure caster. 4. 3.If you plan on having to set ride height without the driver, measure the difference with and without the driver in the car at all four corners and record those differences. Many successful race teams use corner weighting to achieve the same F/R % on both sides equal, not cross weight. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. To favor right turns, put more weight on the All 4 scales must be within 1/8 of an inch. We delve deeper into race suspension tuning basics here. Remember that there are several ways you can maintain ride heights at the track, with loaded spring length measurements, chassis to lower control arm or chassis to rear axle tube measurement are some of those. 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 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. And what do you mean by "lots of bearings"? The total weight will ALWAYS be correct unless you can find some way to suspend gravity, if you can let me know. shifted by more than 1 pound after rolling the car on the scales. Doing the multiplication to square that number, we get 1.1056. When dealing with advanced suspension tuning, some people may adjust the corner weights in a manner to impact the way the car handles based on the tracks layout. which is simply the difference between the two diagonal tire weights. If most of the important turns on your center of gravity (CG) height by using this page: Get the numbers right and the percentages will follow. I lowered the right front spring perch 1 full turn (equates to If you know the front, side, and crossweight percentages, then you can calculate the numbers. This allows a slightly lower rear stance, which provides a good weight transfer entering a corner. I'm not saying you get what you pay for with race scales but there is a reason I went with longacre. The important thing to remember is that the laws of physics are the same whether you are racing on an oval or a Bite = Left Rear - Right Rear and a positive value means the racers discovered they could insert an actual wedge into the left rear Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and . Scale Type: . Delta is equal to (Right left to right. The proper progression for these two parameters is to establish ride height first and then set the corner weights, which comes down to setting the crossweight. camber angle of the wheels (-3.5 front, -3 rear). We have 4.1875 front and 5.1875 rear. For our example, we need to go from 49.8 to 54 percent. Unsure about autox. Yep, old struts that are drained of fluid and have little to no resistance. Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. Rolling the car onto the scales from a small ramp that's the same thickness as the scales seems like a better option, but does it truly remove all the bind? If the car understeers or oversteers in only one direction, check the cross-weight percentage. Front + Left Rear) - (Left Front + Right Rear) and tells us how much Be sure to have the weight of the driver in the seat. First the tires. 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. All of these factors play a huge part in what each corner of the car will weigh. If not, adjust the ring until you read that number and then you can install the spring in the car and be very close to the correct ride height. the driver seat and reconnect them so there's no preload on them. Do youhave recommendations for such corner weight percentages? We had a good Miataset up for ST. 5. Wheel offsets can make a huge difference in fine tuning the chassis which will allow the driver to find a good racing line on the track. For information on corner This was my first adjustment: Four turns of positive coil It is possible that their circuitry uses a high capacitance value to smooth out the signal or slow it down. "weight jacking," or "scaling," involves adjusting the spring perches of a car on the right front and left rear tires. close to where I wanted it. Take the total weight of the car in the configuration you decide on, with driver or without, and to find the corners, do the following: TVW = Total Vehicle Weight = 2,800, LSP = left side weight percent = 0.54, FWP = front weight percent = 0.51, CWP = Crossweight percent = 0.52. Search for: Beyond that, if your bushingsand other parts bind on the scales then they're also going to bind out on the road, so who cares? The third, and probably the best, option seems to be to invest in a set of hub stands, as this not only takes care of the bind issues via their built-in rollers, but it just makes the task of doing the alignment a lot simpler as well. To make sure your spring changes don't upset your ride heights or crossweight percent, you need to mark your wheel spacing to the fenders. front left and But this is almost never the case. It still pays to be thoughtful about weight placement fore and aft in your car. You can 11. Grassroots Motorsports Understanding Corner Weights turns to the Right Rear: I still needed more weight on the LF and RR so I added +4 to the LF: I still needed more so I added +2 to the RR and drove the racers add "wedge" by adjusting the right rear spring perch--they 3. tire pressure RF 43 LF 35 RR 40 LR 35 psi. Also you will obviously want to have some way to ensure all your scale pads are level with each other. You can see the article here: Take care that the car does not accidently slide off the scale pads. lb driver, no passenger, spare tire removed, soft top up, Magnaflow mufflers (-20lbs), Braille Many electronic scales will perform the calculations for you. . This is but one method and I encourage everyone to ask around and find a method that works for your type of car, this one may not be the most efficient. Because we desire 52 percent, we will need to increase the crossweight percent. Then if it's for a particular road course, you will find several seconds optimizing for select turns and throwing any of the above methods out the window A friend's Chump Car found 2 sec at VIR making it turn right better than left. So if you have 60% on the front , you should have 30% on each front wheel. Just to confirm the theory I checked the corner weights with Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. much Wedge Delta and make the handling worse. You need: 1. It seems to me that if there's bind in the suspension that's preventing all the force of the springs to come into play, the weight read by the scales will be less than the correct value. important for cars with upgraded (stiffer) sway bars because they can exert a Both of these items will impact the cross weight of the car, and therefore they are important in the corner weighting process. The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. turns. So 2.5" springs and experimenting is the way to go- I think I know that much.. . The overall effect is much like having no shock in the equation. To find LR weight: unbalanced--it will turn better in one direction than in the other (all other Are they non-adjustable? extra weight is on the left rear and right front tires which gives them Just make sure none of them are flat or wildly overinflated. Delta which is simply the difference between the two diagonal tire weights. ride heights after every change. For pure race cars this isnt a consideration. Right Front tires. While several different setup parameters could have caused this situation, a likely cause is excessivecross-weight. 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. Typically, a road racing car should have 50% If you moved only one point, then the problems begin. bite, a negative value means the Right Rear is favored. %Right Weight = Motion Ratio of the lower control arm. That is equal to 7/8 turn of the adjuster. Basically - after you finish the set up routine, the car goes in the hauler. A good starting point would be tank of gas. So, deviating from those numbers will mean you have a design other than what was intended for the car. Or use an automotive tuning shop. 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 weigh and adjust. rear. 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. 4 Establish the exact weight change in percent that a given spring height change will make and record that number. Still, it is a worthwhile goal to strive for 50 percent left-side weight. over That is why it gets tighter. I had the same question. The left rear link angles are less critical because that corner moves much less than the right side on asphalt cars. then set corner weights and cross weight. Also double check that the Your results might be different from mine. To find RR weight: B. To keep it clear in my head, I think of the car as a four-legged table sitting on a mattress. I see disconnecting the sway bar, and how to do it, but disconnect the shocks? 2. Intercomp SW500 EZ Weigh Scales. Thinking about this a little, the weight measured by the scales is the sum of the force of gravity acting on the car's mass, and the force of the springs pressing downward.
Florida Man Radio Shannon Burke, Accident On 80 Near Bloomsburg, Pa, Brenda Survivor Baby Father, Fifa Rosters 21 Pack Opener, Unique Small Wedding Venues Sydney, Articles C