![]() ![]() This test illuminates differences in powertrain flexibility. The larger the difference between a 5-to-60-mph and a zero-to-60-mph run, the more lag an engine has this is particularly relevant today with the flurry of turbocharged engines. Top-gear acceleration, in a manual-transmission car, where we simply goose the throttle and don't downshift, highlights midrange power. In a vehicle with an automatic, the transmission downshifts (and the times are much quicker), so this metric represents a combination of transmission and engine responsiveness. And that means the times between vehicles equipped with manual and automatic transmissions clearly aren't comparable. No matter what you call it, this is the test that most people care about. We test in street conditions, so launch traction is low and not the level of stick you'd find at a local drag strip. We also do not power shift, which is keeping your right foot pinned while completing a shift. It is up to the tester to determine the best launch technique, and this process can mean that some cars (for example, a launch-control-equipped Porsche 911) require just two or three launches to get the best possible time. Conventional automatics may only require five launches. High-power, rear-wheel-drive cars equipped with manual transmissions are the most time-consuming, and finding the sweet spot of balancing wheelspin and clutch engagement (usually in the 3000-to-4000-rpm range, but it varies depending on the car) may take 10 runs or more.Īll of our straight-line acceleration results are the average of the best run in opposite directions, to account for wind. ![]() #Download toad diagnostic software manual Ambient weather conditions-we record absolute barometric pressure and wet- and dry-bulb temperatures trackside-determine how much power an engine makes. Because of that, we also correct acceleration results to 60 degrees Fahrenheit at sea level. #Download toad diagnostic software fullĬooler air is denser and contains more oxygen, allowing the engine to burn more fuel and make more power.#Download toad diagnostic software manual. ![]()
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