Most engines make the most power in the upper limits of their rev range (like between 4,000 RPM and 6,500 RPM). having a first gear ratio of 3:1 and a second gear ratio of 1:1) will make it difficult to keep your engine revving within its peak power band. Sudden drops in the ratios between gears (e.g. Lower gears should have higher ratios, while higher gears should gradually move to lower ratios. The effect of a low ratio is slow acceleration with high top speed. 0.8:1) is harder for the engine to turn but improves top-end speed in that gear. The effect of high gear ratios is quick acceleration with a sacrifice to top speed. 3:1) makes it easier for the engine to rev high and reach max horsepower output quickly, but minimizes the top end speed of the gear. Gearing ratios determine how many turns of the driveshaft result in a single turn of the wheels (the car's wheels, not your steering wheel). Note the smooth curve of the line connecting the ratio graph bars. Gearingĭefault, conservative gear ratios. Differences of just a few psi between wheels can have a big effect, so don't get extreme with the adjustments. One thing to remember is that a little adjustment goes a long way. But low pressure comes with negative side effects that become evident during cornering, as the more pliable tire rolls under lateral acceleration and gives you sloppy handling. Accordingly, lowering tire pressure can help straight acceleration.
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Lowering tire pressure gives the tire more pliability, allowing it to conform to the ground and increase the overall contact patch with the asphalt. If your FWD car is understeering, especially as the race wears on and the tires heat up, lower the front tire pressure to keep the contact surface flat. If you've reached the effectiveness limit of inflation, try reducing tire pressure to similarly affect the grip levels of your tires. This effect is maximized as the tires heat up and the air inside expands, increasing the psi level. An over-inflated tire will bow out in the center, reducing the contact surface. However, take note that too much inflation can give you the opposite effect. When you take a new vehicle to the track, you should always make some adjustments to the tire pressure, usually increasing the pressure to all four tires to improve responsiveness and reduce tire roll in the corners. Stock tire pressure is generally tuned for comfort rather than raw conering ability. TiresĪdjusting your tire pressure is a good, simple way to improve the cornering performance of your vehicle. Since these changes don't affect your class rating, you can use tuning to improve the performance of your vehicle beyond the limits of your competition. Best of all, adjustments to your car's tuning do not affect your car's class rating. You may see some slight variation with upgrades for other cars, though the general principles to upgrading still apply.The benefits of tuning a stock vehicle for the race track can be huge. Note: This chart was made using upgrades for the rear-wheel-drive Mazda MX-5 Gen 3.
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The below chart gives an overview of how each purchased upgrade will affect your class rating. And while these changes may hurt your top-end speed, it won't matter on most courses-in fact, you may gain a decent handling boost in the upgrade. Making changes to a number of Body and Aero parts will actually drop your class rating slightly. If you find that you've broken the limit of your class, you can remove some upgrades or make some upgrades that negatively impact your class rating. For example, upgrading your brakes hardly affects your class rating, but having a better set of stoppers can dramatically improve your lap times.Ĭarefully choose upgrades that will only minorly affect your class rating. Upgrades to other areas of your vehicle will generally result in very minor changes to your class rating (sometimes none at all), though that doesn't make their effects less valuable. Generally speaking, the upgrades that most affect your vehicle class are power upgrades, weight reduction and changing tires to a stickier compound. If a particular race limits you to racing C-Class vehicles only, you'll want to put together the beefiest C-Class car you can muster without taking the upgrades too far and bringing the car to a B-Class. Higher class vehicles will naturally be better performers than others, but many races restrict how high your class can be. As you purchase upgrades for your vehicle, you affect the class rating of the car. But what makes part choosing difficult is trying to stay within car class restrictions. The more the cost, the higher the gains and the further to the right on the list they are, the better the parts-that's a no brainer. When purchasing upgrades, it's pretty obvious which parts are better.