Bro, you're so funny, I'm just pointing that you're wrong. It doesn't matter if our friend's car here is turbo or NA. Leaner A/F ratio will not make the engine cooler.

Gas detector? Do you mean air/fuel sensor?   

Basically, the closer to A/F ratio of 14.7, the more optimum your engine will be. Too lean and it will cause problems, too rich and you're wasting fuel.

How to know the hydrocarbon chain inside petrol? So you mean the mechanic/tuner must first study Bachelor in Chemical Engineering first?

STOP SPREADING WRONG INFO ALREADY!

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Added on April 16, 2011, 11:14 amAnd enough of your sinkalan!

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Added on April 16, 2011, 11:16 amAt least try to Google or Wiki first before you say anything from your "intuition" or "experience".

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Added on April 16, 2011, 11:20 amThat's why for fuel injection engines, ppl buy management to tune after they have done some significant mods on their car. They want the max power they can get though their mod and this is done by bring back the A/F ratio as close as stoich as possible.