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Message: <blockquote data-quote="DanPromote" data-source="post: 141398" data-attributes="member: 1834">The answer is no. Stock ecu maps have limits where they cannot exceed. By remapping the ecu those limitations are removed and a higher limit is now set to improve performance. Whether the ecu can handle lower octane fuel depends on the ecu capabilities and the engine requirements.On the question of atmospheric conditions, actually it refers to the air intake. The ecu will adjust its air/fuel ratio setting depending on the how much air goes into the intake, so in a way yes at different atmospheres you get different results because of the different air density. On stock ecu as explained earlier it will have safer settings (richer than required) while remapped ecu tends to have leaner air/fuel ratio settings to get better performance.</blockquote>