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Message: <blockquote data-quote="renxun" data-source="post: 3514967" data-attributes="member: 33177">scott- my own experience tells me tuning a map is easier that afm. well it doesnt hold true for all tuners but why i said this is bcuz i deal wid a lot of turbo cars hence tuning wid a map sensor is more handy for me in a few factors. first is the map for fueling. as usual we need a load reference and i would prefer absolute pressure as my load. some pl prefer to use throttle sensor position but i couldnt catch this one so its my bad on it. afm wise, the load will be in voltage form and i couldnt predict it since its not linear. unless im using e manage ultimate i can datalog it and ran map trace to trace back which cell i need to tune if i notice somewhere needs adjustment in my dynojet datalog. still can be tuned but on my side will be definitely take some time as im not too good at it.theorytically ligther internals is more rev happy because it have lesser inertia in its movements and prone to less vibration if compared to heavier internals. why i said so.? im not sure whether pl here would except my example. last time im afraid my 1jz might twist my main long shaft and i did a custom shaft wid steam pipe. mind u its thick and its heavy. altohught its balanced, it would not be 100% balance..and that little error is enough to cost superb excessive vibration to the whole car and damaged the joint. changed to a light truck shaft and re-customized it n balanced, vibration is no more be felt. it should still be there but at least the effect is much less obvious n its much more rev-able. the theory applies to internals that rotates.why they normally say the response and idling can be improved on idling is just as simple as trimming down fuel maps to ideal and slightly bump up the timing.</blockquote>

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