1<!DOCTYPE html> 2<html lang="en-ca"> 3<head> 4<meta charset="UTF-8"> 5<meta content="Find out what influences vehicle performance." name="description"> 6<meta content="performance, tuning, hot rod, racing, brake, acceleration, speed, maximum" name="keywords"> 7 8<title>Vehicle performance</title> 9 10
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17 18 19<div id="main"> 20 21<style> 22.boxchart 23{ 24 border:0.125em solid #000060; 25 background-color:#f0f0fe; 26 color:#000060; 27 font-weight:bold; 28 font-size:100%; 29 padding:0.1em; 30} 31</style> 32 33<table cellspacing="0" cellpadding="0" class="boxchart-table" border="0" title="Click on a subject"> 34<tr><td colspan="9" rowspan="1" > </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('performance.html','_self')">Performance</td> <td colspan="3" rowspan="1" > </td></tr> 35 36<tr><td colspan="7" rowspan="1"> </td> <td colspan="3" rowspan="1" class="rightbottom"> </td> <td colspan="2" rowspan="1" class="bottom"> </td> <td colspan="1" rowspan="1"> </td></tr> 37<tr><td colspan="7" rowspan="1" class="right"> </td> <td colspan="5" rowspan="1" class="right"> </td> <td colspan="1" rowspan="1"> </td></tr> 38 39<tr><td colspan="6" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('lateral-acceleration.html','_self')">Lateral Acceleration</td> <td colspan="3" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('acceleration.html','_self')">Longitudinal Acceleration</td> <td colspan="1" rowspan="1"> </td></tr> 40 41<tr><td colspan="4" rowspan="1"> </td> <td colspan="8" rowspan="1" class="rightbottom"> </td> <td colspan="2" rowspan="1"> </td></tr> 42<tr><td colspan="4" rowspan="1" class="right"> </td> <td colspan="7" rowspan="1" class="right"> </td> <td colspan="2" rowspan="1"> </td></tr> 43 44<tr><td colspan="3" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('braking.html','_self')">Braking</td> <td colspan="5" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('accelerating.html','_self')">Accelerating</td> <td colspan="2" rowspan="1"> </td></tr> 45 46<tr><td colspan="1" rowspan="1"> </td> <td colspan="10" rowspan="1" class="rightbottom"> </td> <td colspan="2" rowspan="1" class="bottom"> </td> <td colspan="1" rowspan="1"> </td></tr> 47<tr><td colspan="1" rowspan="1" class="right"> </td> <td colspan="1" rowspan="1"> </td> <td colspan="2" rowspan="1" class="right"> </td> <td colspan="3" rowspan="1" class="right"> </td> <td colspan="3" rowspan="1" class="right"> </td> <td colspan="2" rowspan="1"> </td> <td colspan="1" rowspan="1" class="right"> </td> <td colspan="1" rowspan="1"> </td></tr> 48 49<tr><td colspan="2" rowspan="1" class="boxchart" onclick="window.open('accelerating-power-limit.html','_self')">Power Limited</td> <td colspan="1" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('accelerating-traction-limit.html','_self')">Traction Limited</td> <td colspan="1" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('accelerating-speed-distance-time.html','_self')">Speed, Distance & Time</td> <td colspan="1" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('hill-climbing.html','_self')">Hill Climbing</td> <td colspan="1" rowspan="1"> </td> <td colspan="2" rowspan="1" class="boxchart" onclick="window.open('accelerating-axle-load-distribution.html','_self')">Axle Load Distribution</td></tr> 50</table> 51<br> 52 53 <div id="article"> 54 55<!-- ************ ARTICLE BEGINS HERE ************** --> 56 57<div id="theory"> 58<h1>Performance</h1> 59<p>We <a href="selecting-tires.html">already said it</a>, vehicle performance is measured by its <b>acceleration</b>.</p> 60<p>Lateral acceleration is often used as a performance «yardstick». For braking, we usually use the «100-0 km/h» distance. For acceleration, we usually use the time from the «¼-mile» or the «0-100 km/h». <b>All of these measurements depends solely on the acceleration capability of the vehicle</b>.</p> 61<p>The tire friction coefficient will be the most important factor affecting maximum acceleration in any direction. <b>The stickier, the better</b>
61.</p> 62<p>Once that is set, some basic vehicle dimensions and configurations will limit what you can get out of the tires. <b>No matter what type of suspension, brakes, engine or transmission you will use</b>.</p> 63<p>By introducing some aerodynamic <b>downforce</b> (or negative lift), <b>you can extend those limits</b>, even eliminate them.</p> 64<p>At high speed, the maximum longitudinal acceleration is usually <b>limited by the amount of power available at the wheels</b>, no matter what type of engine or transmission is used.</p> 65<h2>Weight transfer</h2> 66<a href="http://www.clker.com/cliparts/1/b/7/c/1195436491922377373ryanlerch_fabia_-_all_views.svg.hi.png"><img style="border: 0px solid ;float:right;" alt="weight transfer under lateral acceleration" title="weight transfer under lateral acceleration" src="images/weight-transfer.gif" width="340" name="mainImages"></a> 67<p>The major effect of the basic vehicle dimensions is <a href="http://en.wikipedia.org/wiki/Weight_transfer">weight transfer</a>. <b>Weight transfer is unavoidable</b>. Although, with proper suspension design, it can be redistributed between two different wheels to maximize performance.</p> 68<p>It is important because <span class="citation"><a title="click for source" href="http://www.ozebiz.com.au/racetech/theory/wttranspge2.html">two tires equally loaded will always generate more cornering force than two tires carrying the same weight, unequally distributed between them. So it is evident that <b>weight transfer hurts grip in cornering and braking - we would like to have tires equally loaded</b>. Weight transfer to the rear of the car will help grip for acceleration though</a></span> (RWD only).</p> 69<p>So, in most cases, the «perfect» vehicle would always have 25% of the total vertical force (weight and downforce) on each tire.</p> 70<h2>Theory</h2> 71<p>The preceding is an organizational chart showing how <b>acceleration</b> and other related criteria are calculated.</p> 72<p><b>Click on a subject for more info</b>. The chart is reproduced on every page. Each page explains the theory used for the <a href="car-performance.html">ACCELERATION SIMULATOR</a>.</p> 73</div> 74 75<!-- ************* ARTICLE ENDS HERE ************ --> 76 77 </div> 78 79 <div id="side-menu" class="hide-to-print"> 80
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