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With the lean burn engine in my car, as the temperature drops, I can maintain lean burn to a higher throttle position, i.e. a wider injector pulsewidth as shown on the SuperMID. On a hot summer day it drops out of lean burn at 6.0 usec, but at 25F it will rise to 6.3 usec before dropping out. Since I have a driver adjustable radiator door/grill block on my car, I have the equivalent of a WAI.
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