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SVT Shelby GT500
A/F issue
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<blockquote data-quote="SCGallo2" data-source="post: 16098978" data-attributes="member: 160791"><p>If your engine is stumbling, then it is actually running lean in that situation which isn't good. And if your main concern is after your engine should have transitioned to closed loop fueling, something is not right. Are you running a large mono-blade throttle body?</p><p></p><p>Cold start engine stumbling during open loop fueling is not uncommon with cars running 1000cc injectors or larger. Tuners can adjust fueling tables to achieve acceptable if not perfect driveability, depending on how much focus they put into this area of the calibration (some more than others), because your engine usually transitions to closed loop fueling within a few minutes of operation, where driveability should be perfect... no stumbling and AFR should remain within acceptable limits at all times.</p></blockquote><p></p>
[QUOTE="SCGallo2, post: 16098978, member: 160791"] If your engine is stumbling, then it is actually running lean in that situation which isn't good. And if your main concern is after your engine should have transitioned to closed loop fueling, something is not right. Are you running a large mono-blade throttle body? Cold start engine stumbling during open loop fueling is not uncommon with cars running 1000cc injectors or larger. Tuners can adjust fueling tables to achieve acceptable if not perfect driveability, depending on how much focus they put into this area of the calibration (some more than others), because your engine usually transitions to closed loop fueling within a few minutes of operation, where driveability should be perfect... no stumbling and AFR should remain within acceptable limits at all times. [/QUOTE]
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