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Message: <blockquote data-quote="f8." data-source="post: 138714" data-attributes="member: 923">i agree fully with albundy's opinions above.i think the crux of this ecu tuning lies with narrowing down tolerances.as an example, say main bearing clearance, for my engine, nissan states that the main bearing clearance is 0.004-0.022mm. so the tolerance range here is 18microns. but the max limit is stated as 0.05mm.as such, nissan will set settings in the ecu that take into account this range, along with tolerances in other things from local market petrol octane to spark plug quality etc etc and come up with a tune that is still safe enough to cover a warranty of say 3 years/60,000km.now they will naturally assume the worst case scenario ie if everything was at the worst end of the range all stacked up, ie worst quality fuel with really loose bearing clearances(22microns here) such that oil pressure is on the low side etc etc, the car will still survive 3 years of use without engine failure, statistically speaking.on the other hand, if you find that your engine is relatively well built etc, then you can confidently take away some of these safety margins and go for a more radical state of tune. of course nothing comes for free so you can expect accelerated wear and tear etc.but to my mind, a good tune is one that pushes more performance with the obvious increased wear and tear, but within reason and certainly no catastrophic sudden death failures which would be the case if say you run too much ignition advance at high rpm and load.</blockquote>

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