04-20-2008, 03:19 AM
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Enthusiast
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Join Date: Dec 2005
Posts: 1,098
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Quote:
Originally Posted by revetec
One thing I have found from setting fuel mixtures on a dyno is that once you put the engine in a vehicle you have to adjust the fuel mixtures to that vehicle a 14.7:1 or lean mixture at WOT produces a surge type feel, which is eliminated by richening the mixture up to 13.5:1.
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Can you explain this alittle more. What do you mean by a "surge type feel"? Normally maps are designed to use open-loop rich mixtures at WOT to protect the engine from knock.
Quote:
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Originally Posted by revetec
You may or may not agree with me, but this is why all electronic fuel management systems go into "Open Loop" at high loading situations. If 14.7:1 was optimal at WOT, there would be no need for "Open Loop"
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But running at stoichiometric (14.7:1) is optimal (even at WOT) the only reason it needs to be rich is because you don't want the engine to knock at high load, high RPM.
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