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The BMW Range
3 Series
E46
ron 95 or ron 97
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<blockquote data-quote="astroboy" data-source="post: 487562" data-attributes="member: 4527"><p>It takes 1 to 2 week to get the timing to be optimal for a change in fuel grade despite the millions of calculation per second done in the ECU. </p><p></p><p>From 97 to 95, u will feel immediate lose of power, quieter engine, losing FC but after 1~2 weeks, FC will slowly improve and power will regain a bit but not like 97.</p><p></p><p>From 95 to 97, no immediate gain in power despite the more stable fuel as it takes time for ECU to slowly advance the timing from the optimal for 95 to adapt to 97. Again, 1~2 week to get it right.</p><p> </p><p></p><p></p><p>If u keep switching fuel grade within 2 weeks, the ECU will be never get it right and as a result, u not only can't get the full potential of 97, your FC suffer big time too, with either fuel.</p><p></p><p>The key knowledge here is the 1~2 week rules of ECU adaptation to a change in fuel grade.</p></blockquote><p></p>
[QUOTE="astroboy, post: 487562, member: 4527"] It takes 1 to 2 week to get the timing to be optimal for a change in fuel grade despite the millions of calculation per second done in the ECU. From 97 to 95, u will feel immediate lose of power, quieter engine, losing FC but after 1~2 weeks, FC will slowly improve and power will regain a bit but not like 97. From 95 to 97, no immediate gain in power despite the more stable fuel as it takes time for ECU to slowly advance the timing from the optimal for 95 to adapt to 97. Again, 1~2 week to get it right. If u keep switching fuel grade within 2 weeks, the ECU will be never get it right and as a result, u not only can't get the full potential of 97, your FC suffer big time too, with either fuel. The key knowledge here is the 1~2 week rules of ECU adaptation to a change in fuel grade. [/QUOTE]
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