No, it tries to run the mapped advance. If it knocks, it'll back off the timing. It won't keep advancing beyond the ECU map.
the ecu has an ign map inside that it runs off at different revs and loads, knock occurs when the ign is too far advanced or from hotspots which ign the air/fuel mixture before tdc, the knock sensor detects knock and gives out a voltage, this voltage is processed by the ecu and the ign is retarded until the knock stops the knock sensor does not advace the ign the high octane fuel burns stronger so increasing power output the fuel/ign map puts the amount of fuel required against the ign timing required at differing revs and loads so the map doesnt need a better octane rating, its how the fuel burns and the power it produces the map cannot advance past its own limits, again this has nothing to do with fuel octane ratings
burns stronger? more explosive? lol thats a new one. so what are the callorific values of optimax vs normal 95? i think its shell's own site that confirms the callorific values are basically the same, so it doesnt have 'more bang' lol
you been reading up on the internet again oh and optimax doesnt exist anymore and i didnt say it was more explosive, but i will correct myself on what i did say shell v power contains friction reduces so making better use of the stored energy within the fuel thats fact, the increase felt by the driver tho might not be noticable but the fact tests prove the fuel helps to clean off deposits within the engine which helps to produce a more effiecent engine is good enough for me
didnt tope gear/fifth gear do a test and sow that shell is better than bp and is only really makes difference in the higher bhp cars. i think they did tests on 3 different cars varying in bhp and shell came out on top. recent autosport show had tesco's showing off there 99ron fuel and there was a lor of interest. i read in the auto express mag that the fuel comes from the same refineries but then has additives put in by shell/bp in there brands but its pretty much the same.
