English to Portuguese Tech/Engineering Automotive / Cars & Trucks

In the case of internal combustion engine vehicles, the user manual of the vehicle must include guidelines on **early shifting, maintaining a steady speed at low revolutions per minute (RPM) and anticipating traffic flows.

"NORMAL SHIFTING
In order to understand short shifting, first, you need an understanding of what “normal” shifting looks like. Typically, as drivers hit the peak range of a gear and cannot accelerate within that gear more, they shift to a different gear and gain more acceleration range.

The typical “rule of thumb” with shifting is that when you reach around 3,000 RPM it’s safe, and desirable, to shift. Of course, shift any sooner than reaching 1,500 RPM and it’s safe to say you’ll stall out. Short shifting aims to hit the mid-point between these two numbers.

While shifting, the clutch of the vehicle has to be disengaged, losing precious acceleration and torque. This should only last a second, which for most drivers is trivial, but for the track shifting at the wrong time can be the difference between a when and a loss. Short shifting is one way that drivers choose where and when they’ll shift.

Really, short shifting should be referred to as **early shifting, since that’s what you’re doing."