how to tune gear ratios in drag racing how to tune gear ratios in drag racing

With the 16 / 90 gearing, the pinion must make 5.63 revolutions to turn the spur gear once. For increased strength and efficiency, however, race cars use only straight-cut spur gears, which primarily have rolling contact on their faces, instead of sliding contact. Those of us in Southern California have three tracks within a few hours. Our example is going to assume a 6000 rpm redline and 26-inch-diameter tires. But there is a cheaper and simpler way to select ratios: using experience and experimentation, as shown in our Simpler Method Chart. 1: Go to "Transmission Settings" on the car your tuning. Sometimes the last two are at odds with each other. It all depends on how farand how fastyou want to go. For all-around fun driving with 2S LiPo power, use the 22-tooth pinion. Even after than I can't go faster than 394km/h, and base speed on not tuned gearbox was 391 km/h. If you dont know too much about cars or racing at first, it can be daunting. For example, the familiar BorgWarner T10 four-speed transmission was bought out by Richmond Gear and is available through [Tex Racing](http://www.texracing.com/). Cute, not sure which is cuter, the spelling or the defense of it. Start playing with main ration (go from 2) until you satisfied with acceleration on 1st gear. If there is one thing Ford Enthusiasts have learned over the years, deciphering which parts work with which engines is a far more difficult task with Fords than with many other engine families. I am redlining it. The 17 / 86 gears require 5.06 pinion revolutions for each spur gear revolution. Wheel spin happens when the forces applied at the contact patch exceeds the tyres grip. zDuSsJK9owpDWa8GO9fzDfseiyz4I70TFehvQ65lheUTe4xK27lJFdlcruA1SsCq. Access Drag Performance Calculator. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Your email address will not be published. Passenger car transmissions use angle cut or helical cut transmission gear teeth to reduce noise, while differential gears feature hypoid cut teeth. As i have written before, the concept of 1/4 mile and ssr7 is the same, only thing is you are making the gears longer for ssr7 to hit a decent and competitive speed, while beeing able to come there in a short ammount of time. They were at Daytona for Speed Week and the only way theycould compete was to adjust the intake, exhaust and port timing (these were 2-strokes) to all peak in the same rpm range. This way you can do the math yourself as verification. Gotcha, all good points. Was Aristarchus the first to propose heliocentrism? In 1997, the LS1-powered Corvette hit the streets. If you try to apply these high forces at low speeds, you generate wheel spin. On tracks shorter than 132 feet, a lower-tooth pinion may offer an advantage. Now let's take our theoretical 6.0-liter Chevelle with its aforementioned 4.10:1 gears and put it on the street with a set of 28-inch tall street tires. You can experiment with other gear ratios to customize performance or match power delivery to a shorter track. He also rips off an arm to use as a sword. The launch and acceleration is as important on ssr7 as on indytrust me. It has eight possible gear ratio combinations. The first is for a new large passenger aircraft, and the second for a new fighter aircraft. ODR = 0.928 x 4.10 = 3.80:1. At the time, the new LS1 garnered much fanfare, but in reality, its release marked a seismic advance in V-8 engine technology that ushered in a new era of performance. Let's assume that the gear ratios cannot be adjusted from stock. This gives us another reason to lower the 3.07:1 differential ratio. The nearest 12-bolt gear ratio to 3.80:1 is 3.73:1, and some may think this would be a huge loss of e.t., but the simulation reveals something different. You can see down the straight that there is a couple of tenths of a second gain once the power is put down. Example: 1st Gear set to around 3.4 while 2nd gear is set to around 2.8. But 10.168 / 4.70 (to determine the equivalent rear-gear ratio) equals 2.16:1, which is not realistic. Among the more interesting evolutions to the manual transmission is the new TREMEC TR-9070 DCT. With traction, the 10L80 would have been even quicker. Passenger car transmissions make this connection with friction surfaces which contact first, to match rotation speeds more smoothly. To find the ideal gear ratio for drag racing use your RPM at peak HP. Tire pressure should be lower the more advanced the tires are. But dont let that overcome the acceleration value of more gears to keep the engine in its torque peak. Benefits and drawbacks of each system as well as the impact of systems on the vehicle are explained. So if you have a Ford Mustang with a broad powerband and a transmission that takes a moment to shift; it probably isnt worth it to tighten up those ratios, he adds. #13. The quickest way to figure it out if you plan to run on a given track is to find a similarly performing car and ask the driver what their maximum speed at the end of the straight is (or peak rpm at the end), along with their gear ratio and tire size. Try to set it to 1.7. 3000lb car 2jz boosted . Thats it babyYou want to jump of the line regardles of how long you are racing. This trans has a torque capacity of 664 lb-ft. An overdrive spins the driveshaft at a much faster speed. Our subjects will be a pair of Grand American Rolex-class Porsche GT3 Cup cars from Team Sahlen, and the exercise will involve comparing two different gearboxes, a wide-ratio box and a close-ratio one. Caster is usually best served as a higher number when it comes to Forza Horizon 4 tuning. Most Popular Codes: Active Promo Codes for Survivor!.io: The Full List and How to Redeem Them. 1st Gear: 3.708. If you have a data acquisition system to record your speed history, then its also useful to record throttle position. Not only will you be prevented from flipping over or doing too high of a wheelie, but you will get traction on the rear wheels unlike anything that would be possible without the wheelie bar. Less shifting also avoids the tenth of a second or so of acceleration loss from shifting downtime between gears. Learn more about Stack Overflow the company, and our products. Wheel spin is only beneficial when the friction coefficient of the tires while spinning is greater than the engine's power, so in an Enzo, maybe off the line, (when RPM's would be very low) and that's it. The math works out as 1.28 / 1.89 = 0.677, a 32.3-percent rpm-drop. Specifically, it focuses on the core components of a game engine, audio and sound systems, file and resource management, graphics and optimization techniques, scripting and physics, and much more. You can bring this setting down in order to red-line without One way to improve this without having to completely change over to an overdrive automatic might be a Gear Vendors overdrive bolted to the back of our TH400. . For example, a 4 speed manual trans with 1:1 will make more power than 3rd gear. Also different settings are used when racing 1/4 mile or 1/2 mile. CMS 2021 is good but it needs more and I hope they do more as opposed to just churning out the same formula every few years. The book explains variations between the various B-series designations and elaborates upon the features that make this engine family such a tremendous and reliable design. A gear with a lower numerical ratio, like 3.08:1, does not multiply torque as much, but, all else being equal, will produce a higher axle or tire speed. If you are going to retard the timing (set it backwards a bit), then run the car a little bit leaner. [Richmond Gear](http://www.richmondgear.com/) also bought the rights to the old Doug Nash five- and six-speed transmissions, which have at least eight ratio possibilities in every gear for an almost unlimited number of combinations. The first chapters explain the fundamentals that govern high-performance engines: thermodynamic laws, gasflow, mechanical efficiency, and engine materials and construction. Let's investigate the advantages and disadvantages of plugging a gear into a drag car and those same ratio options for the street. Up the redline to speed up your engine at the risk of slightly more engine damage (strengthen the engine in upgrades to offset this). We simulated that tire-change situation of a 26-inch versus a 28-inch tall tire using a taller 3.55:1 (versus a 4.10:1 gear) ratio, and the car lost barely 0.07-second running 10.30s at 130 mph, but cleared the lights with the taller tire at 5,800 rpm instead of 6,700. Though heavy, it offers a killer 4.70:1 first-gear ratio with six close-spread ratios between first and seventh (1.00:1). Otherwise, the synchronizers or lugs may be rapidly worn or broken, requiring the driver to match speeds even more closelyor perhaps even hold the shift lever in gear. Otherwise, the driver must observe all these straight-away rpm points, possibly by voice or video recorder. With the advent of 8- and 10-speed GM automatic transmissions, the close-ratio approach is taken to the next level. Many drivers who have these kinds of boxes either power shift without letting up on the throttle, or only use the clutch for standing starts. 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Note that you can test anytime and check how it's working for your car. Depending on the car, the race distance, the upgrades chosen, and your driving style, tuning optimisation will change dramatically, because of the number of changes you can make, the total combination of tuning setups and resulting race times is unfathomably big. With a 0.64 overdrive, this effectively converts a 3.55:1 rear gear to a 2.27:1. Suspension tuning is more of an art than a science, and you will have to retune it as you increase the power of your car. Archimedes would recognize that gears are a form of leverage. You have three options to improve the situation, although your paths can be limited by budget, available equipment, or the rules dictated by the sanctioning body. But the truth is, you maybe gain 1 mph by making your front high.. +1 enough arguing. (iOS/Android): All Classic and Challenge Answers and Solutions: Full Walkthrough (UPDATED), Active Promo Codes for Survivor!.io: The Full List and How to Redeem Them, Active Promo Codes for Genshin Impact: The Full List and How to Redeem Them, Punch Kick Duck: Tips, Cheats, Tricks, and Strategy Guide. 2: Press "Reset To Default". Or, if you even have a single channel of data, just record your speed while youre at wide open throttle. The only thing is that, those cars that has good acceleration or 4wd will have a huge advantage at a short straight, because the other one will just keep spinningThe GTR is good i guess, i use all kind of cars. Thats why some manual boxes may now come with up to six speeds, with possibly the top ratio being an overdrive. The old school of thought was to plug in a deep gear and spin the wee out of the engine, but with today's greater power levels, good performance results require less leverage than before. Lets first look at the professional approach, and then reduce it to a practical level. Do yu wnt to communicat liv? I mentioned launching in 2nd gear if you can't get a tall enough first gear to launch with minimal wheel spin. Not only does gearing have little return influence on those factors, its one thing thats relatively easy to adjust at the last minutein race cars that have quick-change ratios. Time to put away the slide rules and see how gear ratios affect lap times. First Edition Hb (1998): 0-521-59330-1 First Edition Pb (1998): 0-521-59674-2. Start off by tapping the first gear down the most, and tapping the next gears down slightly less (such as fifteen taps for first, 10 for second, 9 for third, etc). But whether youre a beginner or pro, the optimum solution for competition will always be the same: First, identify the ratios that create the maximum area under your engines torque curve between minimum and maximum rpm in each acceleration segment or straight; and second, reduce the gear shifting workload on the driver. Let's assume that we're running a 26-inch-tall rear tire and a 550-hp small-block in a 3,600-pound Chevy Chevelle, and it runs low 11s at 120 mph. In How to Supercharge and Turbocharge GM LS-Series Engines, supercharger and turbocharger design and operation are covered in detail, so the reader has a solid understanding of each system and can select the best system for their particular budget, engine, and application. Gearbox tuning makes a massive difference on the Tuscany map or race track, having power out of a corner at any speed is vital. As a result, you wont have a shift point right in the middle of a straight. Pinion gears with 25-29 teeth are for speed runs and drag strip use only, not general driving. But for road racing, if there are no standing starts or pit stops, you can be less concerned with a low first gear and instead make it higher and possibly useable on the course. Brain: IQ Evolution/Trick Puzzle Game - All Answers and Solutions for All Levels and Questions, Brain Out: All Questions Guide - Levels, Answers, and Walkthrough, Active Promo Codes for Survivor!.io: The Full List and How to Redeem Them, Active Promo Codes for Genshin Impact: The Full List and How to Redeem Them, Punch Kick Duck: Tips, Cheats, Tricks, and Strategy Guide. If you have a five-speed box, then you want to select the five ratios that would give you the maximum area under their curves in the shaded area. Not surprisingly, the 10-speed was quicker, at 11.06 at 123.3 mph, compared to the TH400/4.10 gear package, at 11.25 at 121.8 mph. But at SSR7 you have to incorporate aerodynamics and many other factors at high speeds. Keep in mind that the highway cruise rpm needs to remain at or above the converter stall speed to prevent building excessive heat in the fluid. Your second option is to equip your car with a quick-change transmission with many ratios available in everygear. However, that will change the ratio in every gear by the same multiple, which will probably upset you in another corner. Boost control is not typically necessary early on as this is mostly taken care of by modifying the gear ratios, but if you get to the point where even just changing the gear ratios around, having the best tires and having the right suspension tune is not stopping the wheelspin, then take the boost down in the early gears, increasing it . If you also want to get relatively good fuel economy, a 3.55 is a good compromise. If higher, how much? The suspension is also the same, but on ssr7 cars the front is a litle bit higher (so i can hit higher top speed, and then shorten my gears even more). I figure it should stay in 1st whole autocross. Tips, Cheats, Tricks, and Strategy Guide, ACE: Space Shooter Tips, Cheats, Tricks, and Strategy Guide. number than first gear, but not too much. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Remember when a 10-speed bicycle was considered exotic? Conversely, a 540ci big-block making 700 hp and 680 lb-ft of torque will not need as much gear because the engine produces more power to accelerate the car. If we plug in 3.20:1 to the formula, it works out to 2,688 rpm as our new cruise rpm, a reduction of over 750 rpm. Provides step by step strategies to analyze, control, and design diesel engines, their systems, and major components. This gear should be set a bit lower than the third gear, so set it around 0.3-0.5. You all go to think different about gears, you tune your first gear to come quick of the line and reduce wheelspin, this is the same, regardles of which track you are using. This means that rear gear ratios are a compromise. Hi guys, I posted this in another thread but figured I would share it here as it took a few minutes to write. The 10-speed, for example, offers gear-splits of 17 to 18 percent, compared to a TH400's 33 percent, between second and third gears. Gearing for race cars is pretty simple, but track dependent. The torque capacity of this unit is sufficient to live behind 3,800-pound Drag Week cars running in the 7s. In the Grand-Am Cup cars, you have to wait a brief moment or you will grind the transmissionand rip up the box. Wayne says looking at the particular car is important when discussing gear ratios. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. This is one of the most valuable justifications for electronic data acquisition systemseven the simplest ones with just a few channels. Thoroughly updated and revised, this edition includes a new appendix on noise control and expanded treatment of combustion emissions. Watch as David Freiburger, Steve Dulcich, and Steve Brule strap a ProCharger centrifugal supercharger to a bone-stock Chevy 350 bottom end and keep stepping up the boost to find the breaking point. Make sure to upgrade the tires and drop some of the weight on the car first, so your car is capable of gripping better during take-off. Wheelies can be mitigated by the wheelie bar, which allows you to raise the rear end of your car extremely high in order to deal with massive amounts of power, similar to how real life Funny Cars do it. It only takes a minute to sign up. Shifts are controlled by a computera version of this transmission is in the C8 Corvette as a transaxle. Never tried it. A boy can regenerate, so demons eat him for years. This is a seven-speed manual that uses a wet, dual-clutch arrangement in a housing that looks like a torque converter. For Mustangs built for drag racing, there are a lot of factors to consider. In pure racing gearboxes, the gears are alternately connected to the mainshaft by stepped cogs, also known as dogs, which are designed to engage or grab the next gear very rapidly and firmly, an action too harsh for everyday driving. Sign up for a free trial to MotorTrend+ today. However, there is a different approach to gearing that can make your . Connect and share knowledge within a single location that is structured and easy to search. If you have nitrous, then tuning nitrous is similar to tuning your boost psi, but even easier to modify. Selecting Tune and buying the drivetrain will allow you to fine tune your car. This means keeping it in the powerband is essential. For competition with 2S LiPo power, install the optional 29-tooth pinion supplied with your Drag Slash. All of this is an attempt to approach what a continuously variable transmission, where ratios are always changing, does during acceleration. They won the race, but if you were in the wrong geartrying to exit a corner, you had nothing. High Ratio = Short Gears. This guide is perfect, check it out here Gear Ratios Guide. If it were possible to have an unlimited number of gears, or a continuously variable transmission, then the rpm could remain at peak torque and the thrust available would be one smooth curve. This generally makes a small difference unless you shift the way a massive amount. It doesnt matter very much whether you go with a higher differential like this or to a lower differential and then upshift earlierunless you can use your top gear, which will probably be direct (or 1:1), and will have slightly less driveline power loss. However, if you are running an Integra Type R where your transmission shifts rather quickly and the band is very peaky, then it will likely be worth it to tighten up the ratios.. Get a look at it. Example: If your max HP is at 6300 RPM use 6300 for . The manuals gearing chart makes it easy to see which ratios are safe to use, and which you should reserve for racing and speed runs. As far as launching goes, this is not important if you pay no attention to the tachometer, but youre only making it easier for yourself to change this. Survivor!.io Pet Guide: All Pets, Pet Upgrades, Best Pets, Pet Cookies, and More! amount of time. You can change tire diameter, but this usually has a minor effect on gear ratio and a major effect on handling and ride height. This is necessary because vehicles are heavy and require leverage help to accelerate briskly. You start by selecting the lowest useable gear that doesnt go way over the wheelspin limit (as 6.87 obviously does), then run it up to its maximum speed in rpm (or the point at which its thrust intersects the next ratio curve), and then it is shifted down to another higher ratio. Can I gain compression by using older model cylinder heads? RPM's are at 8 - 9 thousand. (The faster you go, the closer you want your gear change ratios to be, but thats another, more complex story.) There comes a time in every automobile's life when the engine just doesn't perform as it should anymore. The clutches are connected to two separate input shafts. Im hr >>>ujeb.se/eTflAZ, Brain Test: Tricky Puzzles - All Answers and Solutions for All Levels: Full Walkthrough, Easy Game - Brain Test: All 300+ Answers and Solutions for All Levels and Questions, Stump Me! Tuning the weight of the car will allow you to shift the Weight distribution of the car from front to back. Raising the rear end and lowering the front and a little bit can increase traction and put more weight on the rear wheels, renting your car from fishtailing or spinning. Or not. This pulls an engine speed of 6,500 rpm in second down to 4,400 in third. By reducing the 6ths gear ratio you'll let your car achieve a higher speed (and thus you will beat the computer). Parabolic, suborbital and ballistic trajectories all follow elliptic paths. is powerful enough to launch you to 4th Gear in an extremely short You are using an out of date browser. Which is better for your truck? (Dont forget that raising the car will also affect aerodynamics.) (The .003 just converts inches and minutes to mph.) Of course, if every last hundredth is important, then the deeper gear is worth the change, but for a street compromise, the taller gear would work just fine. We'll call this overall drive ratio (ODR). It's a complex subject, but when using overdrive in a high-speed situation, you must consider something called critical speed. Enter your 1/4 mile race car's information into our calculator to see how well you will perform. This is a very generic question. However, they are a lot more expensive and therefore cost prohibitive for all but professional racers. For example, a 4.40:1 final drive is actually lower than a 3.70:1 gear. On a TKO-600 five-speed for example, second gear is 1.89:1 and third is 1.28:1. Maybe second gear is too low and you have to shift right away into third, or perhaps that gear is too high and you dont have enough torque. Another thing to take note of is that second gear should be a lower As I can see by the screenshot, you purchased tune for BMW M3 E92. The best answers are voted up and rise to the top, Not the answer you're looking for? The beauty of having a redline a lot higher than peak power is that you can increase your average horsepower to the ground by running past horsepower peak. 4. Gear Ratio Tuning Guide by StarFirebird. If engine torque falls off sharply, or has noticeable dips due to cam selection or intake ram tuning or exhaust tuning effects, then it will be more difficult to avoid drops in the thrust curve by using ratio selections. For top speed runs: decrease final drive values until the simulated top speed hits a max. Wider wheel spacing can increase stability, but if they are too wide, they can increase drag. The simple answer for selecting the best gear ratios is to find the ones that make the driver happy, partly by minimizing the number of shifts, but more importantly by minimizing the lap times. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Passing negative parameters to a wolframscript. Here is a down-and-dirty way of picking the best gearing for a particular car from three choices: 3.07:1 final drive with a wide-ratio transmission, a 3.07:1 final drive with a close-ratio transmission, and a 3.36:1 final drive with a close-ratio transmission. Is there a generic term for these trajectories? Really Cool Cars Pictures Top Of The Line Sports Car Porsche is big on heritage and continuity, and a hint on model positioning for the production 2020 porsche taycan suggests that on the way to the future, the sports-car maker may not be , Your email address will not be published. As stated, The Dro has an excellent tunning tutorial. Change the gear ratios with an eye on what your top speed is in each gear. Adjust following gears as in p.4. The higher the gear ratio number, the "shorter" the ratioyour truck will have less top speed, but stronger acceleration. JavaScript is disabled. For street driving, we want to know our highway cruising rpm. The key is to find the best balance of acceleration, top speed, and tire grip. Privacy Policy. No other book gives you better insight into the expert preparation of engines for racing and high-performance road use, whether your interest lies in street, oval track, drag, or stock car racing. Like we said, the realities of the situation may limit which of these choices you can make. This made me remember when Kenny Roberts was riding for Yamaha. The second thing Power is now easier to make than ever, and with that comes an evolution in the approach to gear ratios. We haven't forgotten the autocross and track day heroes. We'll use our 4.10 rear-axle ratio and the 2.48 first-gear ratio of the popular GM TH400 automatic (ignoring the multiplication factor of a typical torque converter to keep things simple), to demonstrate. Sign up for a free trial to MotorTrend+ today and start watching every episode of Engine Masters, plus much more! Pro Series Drag Racing is unique among racing games in that its as simple or as complicated as you want to make it, but the complicated parts are very rewarding for experimental people. At this point, the serious racer might take his dyno torque curve and use a computer to convert it to thrust at the rear wheels in each possible gear ratio, then plot it against speed along with the bar charts of track speed. To tune rear antiroll bars, take "64" and multiply it by your rear weight distribution percentage (for example, 46% will translate to "0.46"). Well, the first gear is the same on my ssr7 and indy cars. 1. Somewhere between 5.5 and 7 works best, in my opinion. Road course Mustangs tend to have longer rear gear ratios, which means less time shifting. This book addresses the two-stroke cycle internal combustion engine, used in compact, lightweight form in everything from motorcycles to chainsaws to outboard motors, and in large sizes for marine propulsion and power generation. Still, there is alwayshope. For a better experience, please enable JavaScript in your browser before proceeding. Sometimes there may be just two options, with the choices limited to a close-ratio or wide-ratio transmission. However, when ratios are to be selected to fit the torque of a modified engine, or to meet the requirements of a particular road racing courses turn speeds, then it helps to have a wider selection. Gear Ratio, RPM = (MPH x Gear Ratio x 336) Tire Diameter. Of course, one downside to the five-speed is an additional 35 pounds of added weight. You want to be near the top of the rev range in top gear at the end of the fastest straight. The final part of the book focuses on modifying specific engines: American V8s, Porsche 911, Volkswagen Air-cooled and Water-cooled, Cosworth BDA, Formula Ford 1600, Datsun 4- and 6-cylinder, and Mazda rotary engines. (I can provide the math for this if you are interested). Browse other questions tagged, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site. And by fitting a shorter final drive you can achieve better acceleration, since you can increase the amount of torque to the wheels, or you can fit a taller one and increase your top speed. For more information, please see our Posted on Published: 20161227- Last updated: 20190517. Episode about a group who book passage on a space ship controlled by an AI, who turns out to be a human who can't leave his ship?