FNBADAZ06 Posted December 10, 2011 Author Share Posted December 10, 2011 OK....the synthetic Barometer value according to the car's various sensory input showed 28.94 in Hg......well below the TRUE barometer reading from Tom's weather station (and Deer Valley Airport weather station) of 30.16 in Hg. I'm confident the car's baro value is skewed due to the MAP sensor. So the question is, does this synthetic 28.94 inHg value have ANY effect on WOT operation when the car is in open loop ? What about closed loop part throttle cruise ? Seem's if the MAP played into the equation in this operational envelope, the car would determine that the car was operating at a higher altitude than it really is, and adjust the fueling and timing accordingly....then the O2's would see this descrepency in the AFR and command injector timing adjustments. Am I way off on this ? Link to comment Share on other sites More sharing options...
Two Fangs Posted December 10, 2011 Share Posted December 10, 2011 Nope, you're not off. If the car needs to adjust fueling based on MAP at cruise, it has a wide range (+25% t0 -25%) to do so. When MAF is in control, I am not sure it really matters. By now, the car has learned these values and has adjusted adaptive strategies accordingly. In interestingly enough, my BARO showed 104 kPa. Link to comment Share on other sites More sharing options...
FNBADAZ06 Posted December 10, 2011 Author Share Posted December 10, 2011 Should this MAP thing be of any concern to me ? Am I right in that open loop WOT isn't paying any attention to the MAP ? Link to comment Share on other sites More sharing options...
Two Fangs Posted December 10, 2011 Share Posted December 10, 2011 It should not be of any concern. The car takes the value and uses it as an an absolute, even though it is not. It will take information from fuel trims and airflow data to ensure the car is running at its optimum. The big test will be to see how close BARO and and MAP come at WOT. Additionally, when I started my car, it said BARO was 97, but by the time I had driven it a couple of miles, it had corrected to 104. All is good, dude. Now, go run a 10. Link to comment Share on other sites More sharing options...
FNBADAZ06 Posted December 10, 2011 Author Share Posted December 10, 2011 It should not be of any concern. The car takes the value and uses it as an an absolute, even though it is not. It will take information from fuel trims and airflow data to ensure the car is running at its optimum. The big test will be to see how close BARO and and MAP come at WOT. Additionally, when I started my car, it said BARO was 97, but by the time I had driven it a couple of miles, it had corrected to 104. All is good, dude. Now, go run a 10. Hhhhmmmm......104 kPa. You must have some type of ram-air induction, huh ? : Thanks for all the info and education, Mr. TwoSnails Link to comment Share on other sites More sharing options...
Two Fangs Posted December 10, 2011 Share Posted December 10, 2011 The MAP going over 150 kPa may have has something to do with it, LOL Link to comment Share on other sites More sharing options...
FNBADAZ06 Posted December 10, 2011 Author Share Posted December 10, 2011 The MAP going over 150 kPa may have has something to do with it, LOL Good Lord.....you live where barometric pressure is 44.30 inHg !!!!! Link to comment Share on other sites More sharing options...
Two Fangs Posted December 10, 2011 Share Posted December 10, 2011 Yes me, and my two snails. We make our own atmosphere Link to comment Share on other sites More sharing options...
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