- February 10, 2021
Car hooks good on tacky but is terrible off the corners on dry-slick. Running the J-Bar higher on the frame side as compared to the pinion side moves the rear end to the left through chassis roll. This is a long in-depth article. Learn more about iRacing here. he has races asphalt for many years but changed to dirt. Locate the LR lower arm in hole 5 and the LR top arm in hole 6. You can choose mounting ears that have the adjustment holes offset behind the center line of the rear end housing which will add more anti-squat under acceleration. 17 1/2” on center c. 5th hole from top d. … Wondering what all those numbers in the setup file names mean? If you run a track where the car is tough to hook up you can get some added bite to the LR under acceleration if you mount the top link closer to the LR wheel. he has races asphalt for many years but changed to dirt. iRacing setups for the UMP Modified Car at Lanier National Speedway are available for free download on these pages. rods on outside of birdcage with 3/4” spacer 3. Typically, I would run the LR trailing arm up an inch on the front. CAR SET-UP'S If you have a 2016 Late Model, please give us a call for the setup sheet! setup, more so than a fast setup. *FREE* shipping on qualifying offers. Dirt car setup is undergoing a change, and has been for about five years now. Get the latest scoop directly in your inbox. AFCO 270001 Progressive spring 600-2000# B. Often moving the RR ahead cures the loose in condition but you run the risk that the fix is short term. Dirt Modified Chassis - Dial Your Modified Setup Dirt Modifieds Are A Great Entry-Level Class For Many Racers. It would be rare that I would recommend going more than an 1/8” and really I will stick with the thought that square is best 95% of the time – maybe even 98%. Excessive amounts can cause a loose in condition or wheel hop. Influencers TikTok Star Tabitha Brown Buys Lakers Owner’s Northridge Estate By James McClain. If you run the frame side lower or level the rear end housing will move right through roll. Using your three link suspension to dial in your car is a viable adjustment option that can be performed quickly right at the track. IMCA Sportmod 3” (all 4) 2. Most sanctioning bodies the rule states 72” from the back of the engine block to the center of the axle housing. I have 19 inch long lowers center to center a 21 inch torque link at a 17.5 degree angle and a short panhard bar 17 inches center to center mounted to a pinion plate. Pull Bar 1. As the car rolls the RR Trailing are will shorten pulling the RR tire ahead. These are 3 5/8in. (adsbygoogle = window.adsbygoogle || []).push({}); Visit I have already called and talked to DW about switching mine over to a 4 bar z-link and it will cost around 700 to 800. ok so im on a pit crew for my friend its his first year in a dirt modified. Using the J-Bar mounting angle to in conjunction with trailing arm angles both up and down and left to right gives you another tool in your arsenal helping you to achieve faster lap times. In other words, if you ran 1 degree positive on the LF, you would run positive 3 or 4 on the RF. 4 Link Rear Suspension II. 2004 Warrior Underrail - Page 1 - Page 2 - Page 3 - Page 4. Offering a full inventory of high performance racing parts, racing safety equipment, racing components and more. The teams that experiment with the proper three link set up can find the set up that launches their car off the corner with more acceleration to get to the checker first. MODIFIED RACE CAR FULLY ILLUSTRATED SET UPS & TECHNOLOGY MANUAL IMCA - COVERING: Suspension Setup, Adjusting to Track Conditions, Chassis Adjusting, Torque, Springs, Shocks, Tires Rear Suspension, Dirt & Paved Track If you run the frame side of the J-bar is higher than the pinion side the rear end housing moves left through roll. The setup for wet and sloppy versus dry slick is on two polar opposite ends of the spectrum. Looking for some Dirt? DIRT LATE MODEL SETUP SHEETS 1999-2000 & Earlier Warrior 4-Bar - Page 1. Modified Shock Setup Recommendations Mini-Sprint (winged and non-winged) shock setup recommendations Micro shock setup recommendations Late Mode Dirt Car Shock Setup Recommendations Choosing the proper drag racing shock lengths AFCO Shock Dimensions by … In general your static rear setting should be dead square. Rear steer rigs turn quickly and the term “push” just would never apply. Check fuel level. I going to run a couple of more races then put it up for the summer if anybody fines something that works please post. About Us In simplest form, it limits the suspension’s allowable travel. From his humble beginnings, he has turned Bills Built into a powerhouse. Street Stock 72-77 GM/Ford full size; LF: 900 1000: 1000 1200: RF: LR: 250 250: 200 200: RR Up until the close of the 2015 racing season the series premier event was the Super Dirt Week held at the New York State Fairgrounds in Syracuse, NY. You can fine tune the trailing arm location and trailing arm toe settings by using spacers to set the left/right angle to meet your needs. the problem is in the corner when everyone gets on the gas they go and he does not. ... Advanced Setup and Design Technology for Dirt Track Racing Lower links will be in the Middle set of holes on the chassis. 4 LINK DIRT SUSPENSION TIGHTEN CAR ON CORNER ENTRY • Raise left side frame mounted panhard bar on chassis • Lower panhard bar on pinion mount • Stiffen left front spring • Raise left side ride heights (rock up) • Soften 6th coil spring LOOSEN CAR ON CORNER ENTRY • Raise panhard bar on pinion mount • Soften left front spring 14” tube b. Got questions? We provide help through education. Bite Development. By thinking out the trailing arm angles in conjunction with the J-Bar angle you can guide the rear end housing on the path that helps your set up through the turn. the problem is in the corner when everyone gets on the gas they go and he does not. I think you should probably work your way up to this from a very wet track. To really add over steer at the rear end housing you can mount the front pivot point of the RR trailing... Slotted Pinion Mount. When racing on dirt, watch the conditions and be prepared to make changes accordingly, not just to the setup, but also related to rear steer. Terms & Conditions, Address: 1410 80th St SW Unit F,Everett, Washington 98203, Hours: 7AM to 6PM Monday-Thursday7AM to 4PM Friday, Sweet Mfg. I want to avoid having the RR tire to move back and avoid having the trailing arm travel through level which would cause the RR to begin moving forward. After my thirty-plus years of working on various types of race cars, I came up with the setup and logbook which I always wanted while working on cars. Typical HP; Typical Rear End; Typical Axle Lengths; Axle Type; Forward Bite; Most Throttle Turn (a bit Loose On Exit) Some Forward Bite & Throttle Turn; Big Block. Understanding your three link suspension can give you adjustment tools to help you roll through the center of the turn or help to hook you up on exit. Mar 19, 2014 - Nick Hoffman dirt modified chassis pull bar setup 4 Link Rear Suspension-continued G. 4 Link Rods 1. This is my third book and it is a setup log and notebook geared toward the dirt late model racer. Adjusting the anti-squat for your car, driver and track can maximize exit grip getting your team to the finish line first. In your shop you need to spend the time needed to ensure that your rear end is exactly square. Adding or subtracting from my initial set up would be based on the feedback the car provides. While I try to avoid messing with the rear end square it is an amazingly effective adjustment. In many of our articles on various aspects of chassis setup, we try to include both sides of the coin-dirt and asphalt. Knowing What to Adjust Most racing chassis come with a ^standard _ or ^Kit _ setup. 800+ QC; LR = 25.50″ to 27.50″ RR = 33.00″ to 34.25″ All Gun-Drilled Axles; L = 1.115″ R = 1.165″ L = 1.115″ R = 1.180″ L = 1.130″ R = 1.180″ Small Block. 14. View (11) $9.99 More Info. Featuring Dirt racing as well as NASCAR, sports cars, open wheel and more, iRacing is the place to go online racing. In 2001, Bob Bills would become a full-time modified chassis manufacturer with Bills Built Race Cars. That move took this design to the next level. These set-ups are to provide a reference only. Mounting the LR trailing arm with the inner pivots towards the center of the car coupled with the J-Bar running downhill from the pinion to the frame will pull move the LR tire back during roll promoting under steer. It is always my goal to maintain a square rear end and use all the other adjustments to find the right set up. All of my shop set ups include a rear end that is absolutely square. If a track you run is consistently tight then mounting the top link closer to the RR will free the car up under acceleration. 39 1/8” center to center. Merritt was instrumental in helping develop several of the dirt modified chassis manufactured by Dirt Works Race Cars over the years. A place for racers to share and help with modified setups and adjustments “We really didn’t know what we were doing.” These days the dirt … If the car has a push in the center then I might shorten the LR trailing arm 1/8”. 2. Troyer Race Cars offered a four-bar rear suspension during the late 1990s to early 2000s. View (1) $97.99 More Info. My modified uses a 15-inch long rubber biscuit upper link attached to a roll cage cross bar … Once your rear end is square it helps to record the measurement from the brake rotor to the frame as well as from the trailing arm brackets to the frame both left and right. Dirt track race cars can be very difficult to set up. This style of dirt racing vehicle is manufactured for the appropriate series classification, often with a coil-over front suspension, and either a full tube chassis or use of a stock car frame as part of the chassis. Maybe a 1/2” up is a starting point. What used to be standard setups are a thing of the past for the top teams competing in dirt late models, modified, and even the stock classes. Modified race vehicle designed to race in one of the categories of dirt modified racing series and classes include Super DIRTcar, IMCA, World of Outlaws and others. With the trailing arms toed in at the front you can use the J-Bar mounting angle to help steer the rear end through roll. I do earn a small commission from the links to Amazon which are connected to these links. RR: 15 psi. Dirt modified/limited mod setup and adjustment help. To place this concept in perspective I would say 95% of the races I have ever been around in involved a square rear end. Street Stock 72-77 GM/Ford full size; LF: 900 1000: 1000 1200: RF: LR: 250 250: 200 200: RR 3200 - 3400 Lb. 600+ The design of the car is different than a lot of cars out there and we hope to bring a new perspective to dirt modified racing. RR: 14 psi. A top link mount that is slotted will allow for ultimate fine tuning of your top link anti-squat settings. Our second design in our dirt chassis line this IMCA legal metric clip car designed in 2006 was already proving itself to be a successful chassis. They can't beat a 4 bar off the corner. How to Setup Your 4-Link Rear Suspension: Set Your 4-Link Rear Suspenstion Right for Ultimate Speed and Bite! Center all 4 link rods in brackets on frame 4. Sprint Cars. Here's some general reminders to remember during set up! If there are more than 9 iRacing setups available for this car/track, look for the navigation links near the bottom of the page. Have you ever driven a forklift or other hot rod that had the steer wheel in the back instead of the front? How to Open […] Hey, sometimes you miss the setup and it is what it is. RR: 3” offset RR: 14 psi. This is my third book and it is a setup log and notebook geared toward the dirt late model racer. (Racers Edge Books) (Volume 10) Jon Roetman. Speed Shop In general, tracks that are small & have tight corners will require a higher caster split to help you turn into a corner better. Jet Racing. Most caster stagger settings will be between 2 & 3 degrees. You can think out your rear link setup and by understanding how and when the car rolls, you can use the trailing arms to help dial in your setup. Setup Tips: These tips are for an independent a-arm front suspension and 3-link rear suspension type of car, but may apply to other types of suspensions as well. 2009 MODIFIED SETUP SHEET (3-LINK & 4-BAR) (Feel Free to Print Out) RIDE HEIGHTS-(NEW CHEVELLE FRONT CLIP): LF: 7 7/8" to 8" from ground to center line of lower A-Frame bolt RF: 7 7/8" to 8" from ground to center line of lower A-Frame bolt LR: Will be set by amount of wedge RR: 2 3/4" top of lower underslung to bottom of axle tube for under rail By using the trailing arm with plenty of angle I could reduce the angle in the top link creating a more stable entry while maintaining the anti-squat I desired. Dirt car setup is undergoing a change, and has been for about five years now. If you run 60% diagonal then running the top link and trailing arm closer to level is a good starting point. All you need is a PC, an Internet connection and a controller to get started. (adsbygoogle = window.adsbygoogle || []).push({}); The school’s subject matter is comprehensive, well-organized and is presented in a student-friendly manner. As the car rolls the RR trailing arm will push the rear end housing back on that side. Using trailing arm brackets with multiple trailing are mounting holes gives you additional adjustment options. Wondering what all those numbers in the setup file names mean? A slotted pinion mount allows you to quickly set the J-Bar angle. Catalog If you do not have this program, you can download it for free from the link below! Does anybody know where I can get it down cheaper? 400# 5” 6th coil or medium rubber biscuit 2. When it comes to trailing arms I try to avoid linkage arrangements that go though center under roll. It may be an affront to most dirt racers to say that technological changes that have taken place in asphalt racing have trickled into the realms of dirt racing. Again, you can make adjustments based on your set up. Experienced crew chiefs use the three link set up as part of their set up package. Click. Adjust the upper links to be sure the indexing the birdcages is correct. But what benefit does this have for you the racer? RaceKnowHow.com is an educational website that focuses on teaching and showing racers and race car enthusiasts how to work on and how to improve their cars and racing program. (Racers Edge Books) (Volume 10) Left Rear Upper Link‐ 16 1/8 (21‐23 deg. Keep in mind that anti-squat only takes advantage of the available grip through the use of mechanical leverage. Looking for a diagram and explanation of how the suspension works and set up tips any help would be apreciated. We talked to Rex about dirt track modified driving techniques that can improve on track performance. Experience at a given track plays a big role here. I would look for consistent tire temps on short runs with new tires and longer runs with the same new tires. My Big T.O.E. In the Rear Suspension chapter, you talk about using a 3-link rear suspension on dirt, with the upper link having an ideal length of 41 inches and mounted downhill at a 20-degree angle. Topic: 3-Link Dry Slick Setup: 12modracer Dirt Full Roller Total posts: 68 posted August 25, 2004 08:56 PM Need some ideas on how what changes to make to a 3-link short bar lr and long bar rr. A slotted pinion mount allows you to quickly set the J-Bar angle. I always feel that changing the square is a crutch that can create late race handling problems and potentially make your late race tires under perform. They sanction races in four classes including the Big Block Modifieds, 358 Modifieds, Sportsman and the Pro Stock Series. ASPHALT MODIFIED (Standard 3 Point and 4-Link Cars) 2006 Set-Up and Technical Guide. Subscribe Dirt. The Dirt Forum for More Information. 3,052 likes. After my thirty-plus years of working on various types of race cars, I came up with the setup and logbook which I always wanted while working on cars.
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