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2015+ S550 Mustangs
5.0L Coyote V8 Engine Modification/Discussion
Problems with surging and driveability - datalog attached
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<blockquote data-quote="markmurfie" data-source="post: 15684803" data-attributes="member: 177031"><p>As you can see your angle actual and voltage are inverse from each other and move with each other. You want to compare throttle to accel pedal. I think its doing what it should be doing.</p><p></p><p>[ATTACH]1389170[/ATTACH] </p><p></p><p>Looking at your fuel, I don't see anything wrong. LTFT are +/- 1%. STFT are +/- 4-6%. This is totally normal. Your measured lambda is exactly where it should be with no deviations.</p><p></p><p>[ATTACH]1389171[/ATTACH]</p><p></p><p>Your cam movement is normal as well. When the load goes up (from A/C, alternator load, ETC.) the exhaust cams retard to boost engine torque to handle extra load.</p><p></p><p>[ATTACH]1389172[/ATTACH]</p><p></p><p>Looking at the air flow from your MAF it looks fine as well. thottle body moves with load to increase airflow. It does it with out the driver knowing or needing to move their pedal. You do get torque source 13 intermittently when load increases. This could be what you are feeling.</p><p></p><p>[ATTACH]1389174[/ATTACH]</p><p></p><p>Torque source 13 is OSCMOD / Anti-Shuffle. This mode is to reduce the chance of bucking and surging from starting that can occur from the engine or drivetrain changes during steady state accelerator pedal conditions.</p><p>When TQ source happens you can see spark is reduced and fuel is kept stoich. When it doesnt happen your fuel goes rich for a couple seconds.</p><p>[ATTACH]1389173[/ATTACH]</p><p></p><p>I would say try to note where you are feeling the surging/hesitation and if it correlates with the TQ source 13 or when it misses the TQ source 13 and load increases. This can be disabled in a aftermarket tune if it does correlate. If it correlates with a missed torque source 13 your dealer may need to update the ECU's tune.</p><p></p><p>Can you get a log with output shaft RPM? you can compare it to engine RPM and vehicle speed to isolate where the surging/hesitation may be coming from.</p></blockquote><p></p>
[QUOTE="markmurfie, post: 15684803, member: 177031"] As you can see your angle actual and voltage are inverse from each other and move with each other. You want to compare throttle to accel pedal. I think its doing what it should be doing. [ATTACH]1389170[/ATTACH] Looking at your fuel, I don't see anything wrong. LTFT are +/- 1%. STFT are +/- 4-6%. This is totally normal. Your measured lambda is exactly where it should be with no deviations. [ATTACH]1389171[/ATTACH] Your cam movement is normal as well. When the load goes up (from A/C, alternator load, ETC.) the exhaust cams retard to boost engine torque to handle extra load. [ATTACH]1389172[/ATTACH] Looking at the air flow from your MAF it looks fine as well. thottle body moves with load to increase airflow. It does it with out the driver knowing or needing to move their pedal. You do get torque source 13 intermittently when load increases. This could be what you are feeling. [ATTACH]1389174[/ATTACH] Torque source 13 is OSCMOD / Anti-Shuffle. This mode is to reduce the chance of bucking and surging from starting that can occur from the engine or drivetrain changes during steady state accelerator pedal conditions. When TQ source happens you can see spark is reduced and fuel is kept stoich. When it doesnt happen your fuel goes rich for a couple seconds. [ATTACH]1389173[/ATTACH] I would say try to note where you are feeling the surging/hesitation and if it correlates with the TQ source 13 or when it misses the TQ source 13 and load increases. This can be disabled in a aftermarket tune if it does correlate. If it correlates with a missed torque source 13 your dealer may need to update the ECU's tune. Can you get a log with output shaft RPM? you can compare it to engine RPM and vehicle speed to isolate where the surging/hesitation may be coming from. [/QUOTE]
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5.0L Coyote V8 Engine Modification/Discussion
Problems with surging and driveability - datalog attached
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