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They must either have formulas or they can simulate all kinds of weather conditions in their lab to have them programmed in ECU. On the other hand, just use my coolant temp correction map for example, I haven't covered all the way from freezing to normal operating temp. And I still haven't played with air temp correction map, barometric correction, full throttle correction, post start correction, TPS load correction, end of injection correction... just taking the default on them. I just don't have the time to collect a large sized sample for all kinds of conditions to study them and make adjustment like the factories can in a controlled environment.
www.ztechz.net ICQ # 14337317
 
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