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Old 01-30-2008, 02:58 PM   #4 (permalink)
tasdrouille
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In diesels we don't absolutely need to compensate (up to a certain point) as our cars are designed to run lean and are cold when running lean. By default they are very underfueled so we can add some more fuel until the engine runs rich and you start seeing black smoke out the exhaust and the exhaust gas temperature goes up.

Nonetheless a lot of people will also go with a chip to use custom fuel/boost maps to increase power and control smoke.

What does the ECU do in a gasser when it sees it's running rich? Let more air in or reduce the injected quantity?

The key here is that you can get your fuel injected in a shorter period of time with bigger holes which has the potential to be more efficient (inject all of the IQ at the right time). Now it's up to you to keep a light foot if you're shooting for FE.

The better atomization part is a no brainer.
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