With the driver weight, the left side might move down 1/4-inch and the right side down 1/8-inch. Determine your ride heights. Let's explore some ways to do this in an orderly and sensible way. "There's a lot of freedom when it comes to setups using various styles of springs" in dirt late model racing, said a source. (i.e., if we move the RF adjuster two rounds, then we will move the LF adjuster 2.5 rounds.)
I highly recommend using a laser level to confirm the 4 scales are level to one
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. Do this at every wheel. That math gives us a percentage number to . Bearings, like sealed roller bearings,solid bushings, or spherical joints. The cosine of 18 degrees is 0.95106, and that into 1.0 is 1.05146. 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. Iretighten them after I've made all my adjustments. It's
important for oval racers, especially on dirt ovals. track are left turns then having more weight on the Right Front and Left Rear
the same time. that as a result the coil springs must bequite beefy and stout, 600 lb/in or more. My car is a 1987 Honda CRX, set up according toITC class rules. (TVW LSP) - LF = 769D. much Wedge Delta and make the handling worse. T-Bucket . Disconnect the sway bar. 4. Jacking weight will not alter the left side or the rear percentages. you raise the rear of the car 10 inches or more and re-weigh it. 2. Timely refresher that leaves me with a question Ive had for the last couple years that I have not found an answer to in hours of searching. then leave them connected.
Check static weight before working on cross-weight. as Left Rear Bite + Right Front Bite. and Left Rear. Examine a modern push/pull rod suspension, particularly if it uses a crank link to transformthe Rear weight percentage for road racing and autocrossing is less definite. The roll center is an imaginary point around which the rear of the race car rolls. If you are using scales as a base, level the scales with a long level, a long straight piece of tubing, square or round with a smaller level, or better yet, an instrument level such as a construction level. Now, look into details about the matter. Always try to start with the track bars first. That's all total speculation though. Static weight distribution is the weight resting on each tire contact patch with the car at rest, exactly the way it will be raced. and measured between the outside bottom rim edge is 67.75" front and 69.875"
Before putting your car on the scales you need to power up
Leebo's Corner. It is important that you complete the corner weighting process before doing an alignment. However, you can choose to use them. measure (literally). Because we desire 52 percent, we will need to increase the crossweight percent. The less fuel in the tank the tighter the chassis will become. Here is the method to correct the corner weights and set the left rear bite or cross weight. You should also complete this process with approximately the amount of gas with which you will be racing. Wouldn't the fact that it is front wheel drive change at least the front to rear percentages? Unless you have some kind of stupid hyper-critically damped NASCAR type dampers this isn't really necessary. You can also estimate your car's
Struts and trailing arms generally arent great in this case as they have a lot of inherent bind. And what do you mean by "lots of bearings"? They're made by Proform, and are quite a bit less expensive than the ones made by Intercomp, but they got good reviews. We run an extremely high banked 1/5 mile clay oval in Alabama that is always wet and low bite. You can also use this online calculator to compute your corner
supposed to. Once static weight percentages are set, work on cross-weight percentages. Bite = Left Rear - Right Rear and a positive value means the
This is for a race prepped 1984 Audi 4000 quattro(2375lbs.
Track Side Quick Reference - FMI Knowledge Base - FMI Racing Or use an automotive tuning shop. The suspension of the racecar uses the same general theory and needs to be adjusted so that the car is stable. Brake pedal is soft, spongy and/or long before the car is run: Air in the system - bleed brakes. Ideal weight percentages: Front - 43-45% Left - 53-56% Cross - 52-54% What do these numbers mean? another. racers only turn left we can balance the car for better grip in left
The design has the engine and transmission scooched over to the drivers side so the drivers side weighs more empty. Jun 7, 2018 #8 . Toe inn a 1/4 inch. Then just leave them attached. Thanks for posting this. to get them exactly level. The "Corner Weight" (virtual scales) now determines the ride height and/or corner weigh . 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. 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. R. racing junky Member. Disconnect and adjust later. This was a very interesting post to me. Guess I have to try it. 2. coil over 5 turns. 3 To make changes to establish the crossweight percent, we scale the car and record the crossweight percent. Left Front and Right Rear but you'll have to test to find out what works best. and stock rear sway bars connected. For high banked tracks, the front spring rate must be increased and it is often necessary to. Even 1/8 inch difference will make a difference, especially if you have
If you want to raise the front of the car then extend only the
Now that we have established the ride heights, our weights could be anywhere. Here's a box stock 2006 Honda S2000 with 5/8 of a
The new existing ride heights are LF 3.6875, RF 4.8125, LR 4.1875, RR 5.3125. 2 1/2 turns. I have now added the ratios so I can visually see what's happening. It still pays to be thoughtful about weight placement fore and aft in your car. The height of the rear roll center (and the front also) is critical to handling. I don't like the lower weight ratings and plastic scale pads of proform. That is why it gets tighter. Right Rear. Multiply the wheel load of 685 times the motion ratio squared, 1.3611 times the shock angle cosine squared of 1.1056 and we get 1,030.8 pounds of spring preload. It is best to get 50 percent left-side weight when possible. extra weight is on the left rear and right front tires which gives them more
We also take five rounds times the multiplier for the front of 1.25 5 = 6.25 rounds out of the LF. You've tried springs, shocks, different bars, neutralizing the anti-roll bar, and nothing seems to work. 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.
Kart WHEEL BALANCE - www.KartPartsDepot.com 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. 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.
What Spring Rates To Use In Your Race Car - MotorTrend be appropriate such as making small adjustments to all 4 wheels--add preload to
In almost all cases, the loss of cornering performance in one direction is greater than the gain in the other direction. Prepare the car. stiff springs on your coil overs. Currently, dirt car racing involves a left-hand weight measurement of 53.5-55, along with a wedge between 75-125 pounds. (adsbygoogle = window.adsbygoogle || []).push({}); I still needed more weight on the Left Front and Right Rear so I added + 4
Recheck the ride heights and adjust to fine tune, making changes to the front and rear at the same time. Excessive front toe in will make a car turn into a corner quicker, & may create a loose condition. If you increase the amount of cross weight or left side, you will decrease the amount of bite in the kart. Understanding corner weights. Today's oval
Other things to take into consideration are track conditions and weather changes. important for cars with upgraded (stiffer) sway bars because they can exert a
Once you get the car up on the scales you'll
Vehicle Scales | Corner Weight Race Car Scales - Speedway Motors I
5. Wedge Delta is equal to (Right
So, deviating from those numbers will mean you have a design other than what was intended for the car. The front will show close to 60%. Right Front tires.
4m.net - The Most Opinionated Racing Message Board In The Universe Your car may be designed to run different ride heights than these. turns. Corner weighting your car is
Cross weights can be changed by making ride height adjustments to the coil-over suspension by either winding the lower spring platform up or down. In the example at the beginning of the article, this was the problem: a cross-weight percentage that was less than 50 percent, and probably off by at least two percent. Less tread on hard slick is good. You can see the article here:
Also you will obviously want to have some way to ensure all your scale pads are level with each other. At the rear, your rear control link angles are critical to maintaining rear alignment and determining rear steer angles and/or reducing rear steer altogether. However, for dirt oval RC cars, foam tires are the norm. racers only turn left we can balance the car for better grip in left
And since the necessary scales to complete this process cost in excess of $1,000, I suggest you have the corner weighting done by finding another club racer in your area who has (or knows someone with) access to scales and would be willing to help you. Intercomp 102030 5X5 Hub-Mounted Corner Weight Scale. Also double check that the
McMaster-Carr adjustable end links
Disconnect the shocks, when possible, and the anti-roll bars. Some engines are used in two different classes with the only change being exhaust system. the front ramps then jack up the rear and lower it onto the rear scales. them for the corner balance. I found that the tire will absorb side loads quite well and was repeatable. 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. You can see in the "Target Corner Weights" section that the Left
The Science Behind Dirt Late Model Suspension Setup Once you get the car up on the scales you'll
For information on corner
rear. Caster creates stability as the geometry . I recommend adding an eighth or slightly more to the lowest corner just to make sure you pass tech. This approach is commonly used in oval track racing. We should now be at, or near, the desired crossweight percent. If your car has coil over adjustable shocks you should consider
June 2017 -Center spring steering, corner judder w/ swing axle or beam axle . It's better to make many small changes than to try
A set up plan will help you to build a race winning effort. Measure control arm angles after each change. Are they adjustable? Of course you can add too
Astrut with its innards removed? Be sure to have the weight of the driver in the seat. If you raise the ride height at a given corner (put a turn in or add a round of wedge), the weight on that corner will increase, as will the weight on the diagonally opposite corner. Custom iRacing Setups and Paints for dirt oval and asphalt oval cars. . it would help the car turn left and accelerate better. We will deal with preload on the bar later on. over
Same goes for for swaybar endlinks. Front + Left Rear) - (Left Front + Right Rear) and tells us how much
rear. spread when the car is lowered onto the scales. Then move components like the battery or fuel cell. Strive for repeatable and take the measurement as a data point, instead of an absolute. Adjustable end links are more
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. are favoring the left rear tire for better acceleration out of left
A trucking company scale meant to weigh 80,000lbs may not be accurate enough for a 3000lb car. That is because all of the points move together. positive Bite and positive Wedge Delta. more important corner balancing becomes. The weight transfer process occurs regardless of the spring rates at each corner of the car. I didn't hunt for that missing 1 %. I sometimes watch in frustration as teams struggle to set the corner weights and ride heights on their cars. This will not change the left-side or rear weight percentages. You can
Basically so long as I don't completely overcook a corner entry, it does better than any car this heavy has any right to Good stuff. Yep, old struts that are drained of fluid and have little to no resistance.
RC Dirt Oval Car Setup & Tuning Guide [5 Key Steps] Get it right and your car launches down the corner, hits that hard hairpin just right and holds the corner at full throttle. as Left Rear Bite + Right Front Bite. want balanced turning in both directions. 1 of the section on "Adjusting The Corner Weights," and that is 685. Additionally, it is much more difficult to change rear percentage much, since rear weight is mostly a design function. If you shocks are working normally they are not worth worrying about. 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? height and corner balance new springs. If you want to raise the ride height then extend both LF and RR coil overs
This obviously means that decreasing cross weight or left side weight So as long as you are draining the fluid from your shocks, also remove or cut away the seals. My track width with CE28 17" x 9" wheels
If you want to lower the ride height then retract both RF and
Dirt Late Models. Doing the multiplication to square that number, we get 1.1056. Wedge Delta and what values work best for certain tracks and conditions
springs to put more weight on the left rear (and right front) tires and
The driver is optional based on No.
Weight Training: Everything You Need to Know About Race Car Weight For dual a-arm solutions, dead shocks can be used with springs and they can be built with much less bind out of the box. Before putting your car on the scales you need to power up
To increase rear weight, move weight as far back as possible. The only way to change the static weight distribution percentages is to physically move weight around in the car. For our example, we use LF 4.00, RF 4.50, LR 4.50, RR 5.00. Make sure the floor is perfectly level; use shims under the scale pads if needed. An analogy which is commonly used is to imagine that the car is a four-legged table. how and why to corner balance a car. knew I needed to put the car on the scales. For that level of caring, I wouldn't think too much about it. split the adjustment between all four wheels--extend the LF and RR 1 1/4 turns
Auto-Ware (Autoware Inc) auto racing reference library If your car's diagonal corner weights are not equal then its handling will be
11.
Setup Routine - JOES Racing Products Our current setup is as follows - 270 lbs Car & Driver Cross Weight = 48% Rear Weight = 61% Left Side Weight = 51% LF = 56 lbs RF = 48 lbs LR = 82 lbs RR = 83 lbs Small angles can throw off your readings significantly. Example: RF = 643, LR = 751, so, (643 + 751) 2,800 = 0.498, or 49.8 percent. It's one reason why racing pushrod suspensions tend to employ geometry with minimal shock/spring movement,requiring ultra-high spring rates and very high damping force shocks. Moving or removing weight is one Replacing a heavy battery with a light weight one allowed me to get close . Now that we understand why we need to maintain a set ride height, let's go through an example of how to set ride height. I painstakingly leveled the scales and marked their locations
the scales and zero them with no weight on them. racers discovered they could insert an actual wedge into the left rear
Even on a track with mostly right-hand turns, the problem in the left-hand turns costs a lot of time.
Spring Rate Calculator - Ridetech end-link into the anti-roll bar's hole. If you want to raise the rear of the car then extend the RR
The more power a car has, the more that static weight over the drive wheels helps acceleration off the corners. 3. A place where you can add in your Photo Galleries.
Weight Distribution Theory | Bob's 4 Cycle Karting It is defined as the total weight resting on the right-front (RF) and the left-rear (LR) tires added together, and then divided by the total vehicle weight. Raising the rear end will also provide a little more on-power grip by keeping more weight directly above the rear tires during acceleration. For our example, we need to go from 49.8 to 54 percent. And if you hold the inside wheel so it can't spin, the outside wheel will turn 400rpm. 6. I guess I should work on losing weight personally (i am 220~). The other two corners will lose weight. weights: Corner Weight Calculator if
Chassis FAQ | Hyper Racing A good starting point would be tank of gas. So if you have 60% on the front , you should have 30% on each front wheel. Bounce the car at each corner to free the suspension from any bind, then roll the car onto the scales. ZJjtX0xiMzjbfb86GLC7qpXBkrSlFeSNVds8hGW514OXUKSxf6kBDIneIL3TzHQV.
Dirt oval racing tips/ Go karts - Don Terrill's Speed-Talk
Because karts have so much caster having the steering turned even slightly will cause a big change in the corner weights. 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. This spreadsheet will also give you an estimated center of gravity height if
Crossweight is calculated by adding the RF and LR weights and then dividing that sum by the total weight. Cross Weight Calculator | Eldridge Racing | Micro, MiniSprint Parts and .
Whats your SETUPS Dirt Track Racers? - Racing Forum - j-body On oval track cars, cross-weight is usually used in conjunction with stagger (where the right rear tire is larger in circumference than the left rear tire) to balance handling. you run on the track. used cheap linoleum tiles (49 cents each at Home Depot) to shim two of my scales
Positive Caster is created when the caster line lands forward of the contact patch. not to push it off the scales, to unbind the suspension (as the car is
the sway bars because they fail so often and the bars only added a couple of
I
Search for: We have 4.1875 front and 5.1875 rear. 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.
Need some dirt oval setup advice! | Hobbyist Forums The overall effect is much like having no shock in the equation. retract the right rear tire which puts more weight on the Left Rear and
1. turns. you don't use Microsoft Excel. in left hand turns than in right turns. tires. A perfectly corner balanced car will handle the same when turning left and right, and will maximize the tire contact area on all four corners.
Understanding How Weight Distribution Affects Your Race Car Since this article still gets a bunch of traffic, just bumping it up. But stagger is not a good idea on a road course or autocross either, where the ideal is 50-percent cross-weight and no stagger. battery (-15lbs), ride height lowered approximately 1 inch, all 4 Bilstein PSS9 coil over
For now, we don't want the bar to influence the ride height or the weights we set later on. 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. %, Bite =
To favor right turns, put more weight on the
It's
(adsbygoogle = window.adsbygoogle || []).push({}); If you prefer Microsoft Excel a Corner Weight spreadsheet is available for download here
The ultimate goal is to find the balance that will eventually lead to faster lap times.
Dirt track racing - Wikipedia Basically - after you finish the set up routine, the car goes in the hauler. weights into the spreadsheet (the blue numbers in the left "Corner Weights"
over). Using dead strut inserts could be an option for cars with strut suspension. The Circle Track Analyzer is a computer program that simulates most any car you can design, racing on most any size oval track. 13. There are legal issues too at the front. Here are some setup tips that will help you really get the most of of your Slash: > Keep it clean. We do this by jacking weight into, or adding preload to, the RF spring and the LR spring. Dirt track racing in Australia has a history dating back to the 1920s and 1930s. You can estimate your car's center of gravity
Some of the most popular engine packages are the Yamaha KT100S, Parilla Leopard, Honda CR125, Briggs L0206, Honda Clone, TaG (Touch and Go) and many more. Bite should be positive for oval racing, Wedge =
Setting static weight distribution and adjusting cross-weight percentage is one way to assure good handling. should have their spring perches in the same spot and your left rear and right
Cross Weight % =
Wedge is a term used in the
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. Here is what you do. Finding these values and maintaining them is at the top of the list for being consistent in your racing effort. This article explains everything pretty clearly and I feel like I could tackle the job myself now! preload (extending the shock) to the Left Front, and one positive turn to the Right Front. Tuning with anti-dive probably won't be . Bite = Left Rear - Right Rear and a positive value means the
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. suspension). I mainly run the 3/8. The intent of the track scales is to determine a car's total weight to meet minimum weight rules and left side percent (or right side weight) to meet a side weight rule. That makes every little detail that much more important. It would just automatically settle. 12.
How To Set Up RC Dirt Oval A Guide - Explained! If you want to lower the front of the car then retract only
Bottom line, you can strive for perfection, but ultimately youll just make yourself crazy. Afterward you need to adjust the settings to the correct maneuvers. Equal weight on each front wheel, same on the rear. Most chassis manufacturers will tell you what ride heights are best for their cars. Can do to just left sidesor right sides, or to all 4. Since oval
I gave up on running adjustable end links on
The outer rear tire drives "around" the outer front tire, allowing the chassis to efficiently turn into the corner because the rear tire the front ramps then jack up the rear and lower it onto the rear scales. We had a good Miataset up for ST. you run on the track. I use 2x6 wood planks as ramps to drive the car onto
If you think you need to make crossweight changes, remember the amount of change per adjuster number, in our case it was 7/8 turns per percent of crossweight at the right sides (left sides again are times the multiplier), and make even percent changes, such as a half percent or whole percent. Please post on the appropriate 4m forum. after this adjustment we still need to add 39lbs to the Left Front and
anti-roll bar with the end-link adjusted so it's easy to insert the
Check your tire pressure and bump it up to the hot pressure
TVW CWP FWP or, 2,800 0.52 0.51 = 685B. Right Front tires. When that time arrives, you walk across the racing surface, into the dirt oval's imperfectly defined center, and meet your instructor. If you want to lower the rear of the car then retract the LR
One of the most important aspects of car setup is the static weight distribution and the cross-weight percentage. You've mentioned "dead struts" a couple of times - what do you mean by that?
How To Understand Differentials - RC Car Action turns. I dropped my integra off at edge to have this done today. When Wedge is balanced at
If we are talking of weighing a stock type vehicle, not a lot can be done since there are no adjustable parts. Thanks. used are 0.045" thick. This will pitch the vehicle's. The typical goal in corner weighting cars is to make the cross weights equal. So 2.5" springs and experimenting is the way to go- I think I know that much.. . I stretched my tires to get the RR right and now I'm . need to roll the car back and forth a few inches several times, being careful
We don't ever move weight around to get crossweight, but we do move weight to change our front-to-rear percent or the side percent of total weight. 2) Stagger: Stagger is how much bigger the right side tires are compared to the left side tires. The car is built on a jig for a particular ride height layout. < Enter your corner weights in pounds or kilos and click 'Calculate'. 2 coils cut off springs 4 corners. 4. - can make your car dive like a dump truck or a block of wood on ice. So, ride heights in the front are more critical for maintaining camber angles. I made a 4-scale system for my off-road cars. Delta which is simply the difference between the two diagonal tire weights. You will have to repeat this every time you lower the car onto
At the right rear, a quarter-inch change in the height of the end of the link will change the angle and can make an asphalt car undriveable. does not change when a driver is added. Wheel Offset Changes. 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
When you lower the panhard bar the rear roll center drops. surface. To find RR weight:
2018 Arrow Chassis Street Stock. - zwrw.barettobeltrade.it Basically, I don't see much of a relationship between 'static' corner weighing via adjusting spring length and the addressing of fundamental L/R weight imbalance as those difference are what drive suspension and mass motions when moving. Right Front =
11. Corner Weighting To increase left-side weight, move weight as far to the left as possible. Avoids a mess on scale pads and tires,prevents dirt fromcontaminating lube. Once the corner balance is complete put someone in
2 When you make a spring change, bring that corner back to the measured distance from the wheel rim to the fender mark by adjusting the spring height.
Roll Center Explained - FMI Knowledge Base - FMI Racing