The processors’ performance is measured in megahertz allowing performance in millions of calculations per second.Īll of these advances in performance and fuel mileage are running concurrently with stringent manufacturer emissions standards. These standards are very restrictive in nature power output is greatly affected as a result. A single vehicle model will sell 100,000+ units worldwide and each unit must meet varying countries’ emission standards. In the US, the EPA requires manufacturers to cover specified major emission control components for the first 8 years or 80,000 miles. A manufacturer cannot risk their reputation or their bottom line if they sell a car that has difficulty passing post-sale emission testing. To meet required standards, a significant margin for error is built into the calibration, which leaves power on the table.Įngine sensors are built to read within certain tolerances. As these sensors age they will often degrade and the reading sent to the ECU will vary slightly. Knowing this, manufacturers err on the conservative side to help avoid emission/warranty issues by building in a margin of error. In addition to building in flexibility for ailing sensors, manufacturers are also forced to consider other wear items either from lack of service or neglect. As a proponent of performance you wouldn’t do such a thing, right? Old spark plugs, dirty air filters, low grade fuel accidently or intentionally run through the engine are all taken into consideration when calibrated by the manufacturer.
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