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Message: <blockquote data-quote="wglee" data-source="post: 141380" data-attributes="member: 610">Asking a similar question twice? If so, it was not intended. My apologies <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite7" alt=":p" title="Stick Out Tongue    :p" loading="lazy" data-shortname=":p" /> Actually, I have more queries arising from ALBundy's reply eg.1. Let's say we use 98 octane fuel as a benchmark for the highest octane fuel. With or without remapping/piggybacking, wouldn't the stock standard ECU in any event be able to advance the timing to the maximum permissible level before the onset of detonation, if 98 octane fuel is used? 2.  Let's also say that 89 octane fuel is the benchmark for the lowest octane fuel. I think we can agree that a stock standard ECU has the ability to retard the timing to the level just before the onset of detonation, if 89 octane fuel is used. Taking ALBundy's reply to its logical conclusion, such an ability is removed after a remapping/piggy back job. Assuming the answer to 1 above is in the affirmative, can one conclude that the remap/piggyback job does nothing to the car's ability to take advantage of high octane fuel other than what is already provided by the stock ECU but would adversely affect its ability to cope with low octane fuel?    But never mind, lest I be seen as asking similar questions repeatedly <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />I must confess unreservedly that ECU remapping/piggybacking is technically all new to me, but I heard that:A. Atmospheric conditions have a bearing on a car's performance eg. a car with a given ECU setting can be more powerful in colder countries due to the denser air etc, compared to the same car in a hot country. Rather than custom setting the ECU to suit different climates in different countries, every car's ECU has only 1 single compromised setting to suit all the different atmospheric conditions in different markets/countries. B. A remapping/piggyback job is to, among other things, optimise the ECU setting for the particular climate and country where the car is operated/driven.Are A and B above correct?</blockquote>

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