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Nyet — Sat, 03 Oct 2026 06:19:09 GMT

The OEM philosophy

← Older revision		Revision as of 06:19, 3 October 2026
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	==== The OEM philosophy ====		==== The OEM philosophy ====

	The stock OEM calibration is designed to make the same ~250hp in every weather condition — 0°C winter mornings and 40°C summer afternoons alike. It does this by '''increasing''' boost when it's hot (to compensate for lower air density) and '''reducing''' load limits when IATs climb too high (to prevent knock). The result is a car that feels the same year-round. Consistent, predictable, and leaving a lot of power on the table when conditions are favorable.		The stock OEM calibration is designed to make the same ~250hp in every weather condition — 0°C winter mornings and 40°C summer afternoons alike. It does this by '''increasing''' boost when it's hot (to compensate for lower air density and reduced timing) and '''reducing''' load limits when IATs climb too high (to prevent knock). When it is cold on the other hand, the boost request is very low, partially because the stock calibration can add up to 7.5° timing when it gets cold, giving you equivalent performance at much lower throttle positions and leaner AFR. The result is a car that feels the same year-round and gets good gas mileage. Consistent, predictable, and leaving a lot of power on the table when conditions are favorable.

	You likely want the opposite philosophy: '''take advantage of cold air''' by allowing more boost and timing advance (cold, dense air is far less knock-prone), and '''protect the engine in hot air''' by reducing boost and timing before knock becomes a problem. A properly calibrated IAT strategy can make noticeably more power on a cold day compared to a tune that ~~ignores~~ ~~air~~ ~~temperature~~ — power that the stock mapping deliberately throws away in the name of consistency.		You likely want the opposite philosophy: '''take advantage of cold air''' by allowing more boost and timing advance (cold, dense air is far less knock-prone), and '''protect the engine in hot air''' by reducing boost and timing before knock becomes a problem. A properly calibrated IAT boost/fuel strategy can make noticeably more power on a cold day compared to a tune that pulls boost/fuel when it is cold — power that the stock mapping deliberately throws away in the name of consistency.

	==== How ME7.1 handles IATs ====		==== How ME7.1 handles IATs ====

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