I was under the impression that one of the reasons that diesels ran efficiently (besides their high compression ratio) was that they ran very lean air to fuel ratios when cruising. To make more power at a given rpm you put in more fuel.
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Originally Posted by Graham
My SL is D-Jet. In order to do any kind of tuning, they need a way of analyzing exhaust for %CO. (AFR can be translated to %CO). That is why I installed it initially. It uses a wide band O2 sensor.
I set it more for performance than economy, but with the gauge it is easy to try different settings for both idle and load mixture (different controls)
Those engines sometimes have a hot start problem. The gauge shows that up clearly - mixture goes way lean after car has been sitting hot for a short while. Enriching idle mixture helps overcome that.
Sorry - probably more than you wanted to know  |