Discussion
Which effect does fitting a numerically higher final drive ratio have?
Answer: A
A higher numerical ratio multiplies the torque more and reduces the road speed for a given engine speed, improving acceleration at the expense of top speed and cruising economy. Rally cars use short ratios and long distance cars long ones. The engine speed for a given road speed rises rather than falls. Most errors here come from carrying across a result from a neighbouring case where it does not hold. A symptom that appears under one condition and not another is what narrows the diagnosis quickly.
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