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D-Jet 120-130

posted by  JohnMc on  Thu Nov 24 02:39 CST 2005
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last visit: Thu Oct 23 07:42 CST 2014
[RELATED]

"I don't know why you would need an O2 sensor either, other than to look after a cat-con."

In a perfect world you wouldn't, and the fuel map built into the D-Jet computer would always be valid. But in reality, things happen. The fuel pressure varies a little. A non-stock exhaust system changes the flow. The temp sensor stop working quite right. Without feedback D-Jet can only blindly inject as much fuel as it thinks there should be, and can't adapt to any changes in outcome. Without feedback, D-jet is typically tuned somewhat rich, because it doesn't really hurt much to burn extra fuel, but going lean is bad. This might give you as much power as the motor can make, but it can't pair that up with the best mileage at the same time.
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I'm JohnMc, and I approved this message.






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