Quote:
Originally Posted by apk919
It's the schematic that has me convinced that the IAT shown as an OBD-II parameter is from the TMAF... the TMAF is labeled IAT in the schematic, and there's a large note saying that the temperature signal from the TMAP is not used.
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let's swap the wires and see what happens
no seriously shooting in the dark here, but assuming post SC is the optimal "correct" IAT position, perhaps lotus thought the engine could run faster and handle running on the "misinformation", and because they knew the IC couldn't cool charges enough anyways, so they left pre SC (knowing if they hadn't the SC cars would be dog slow). If so, any cars planning on boosting up, should seriously consider compensating for this eitehr via relocation or ecu map. Or... figure out a way to cool the charge down nearer to TMAF temps.
even though I am sure there's more inputs that determine spark advance (one of pids and logged), it would be interesting to establish thecorrelation between spark advance, fuel trims versus the IAT data. This would help us understand in relation to other inputs, which is most important. For example, I suspect ECT is pretty important but doesn't appear much attention is spent to control this variable. wheres the statistic/regression analysis software when you need it... time to dig through those econometrics class materials...