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Cobra Forums
2013-14 Shelby GT500
What's changed in an aftermarket "stock" tune?
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<blockquote data-quote="VNMOUS1" data-source="post: 15239089" data-attributes="member: 36794"><p>Dinosgt, the knock sensor limit statement is incorrect. We can command the amount it pulls, the sensitivity, the rate in which pulls as well as how it recovers. As a rule, it will pull quicker than it adds back. So, it's important to have the calibration spot on and not pull any at all. The Spark Adder For A/F @wot will add x amount of timing if everything is in good shape. It's far more efficient and provides better power to command a little less timing in the table and let it add than to have the net result of rapidly pulling then slowly adding back. The KS adding and Spark Adder for A/F@wot are two different things btw. </p><p></p><p>Downstream temps. Ford stock cal pulls at 110f and scales more aggressively moving upward in the table. </p><p></p><p>IAT2 averages 30f above ambient so on an 80 degree day you can be pulling timing while idling in your driveway. This is why a fanned heat exchanger like our Triple Pass Dual Fan unit is SO important. When you have one, we raise that threshold in your cal to start later but act more aggressively at higher temps. Not only does it reject heat but the recovery time is monumentally faster. </p><p></p><p>Throttle angle. Yes, it's 82* at wot. Log both commanded and actual and compare them. </p><p></p><p>It could be shutting due to torque limits, clutch protection or a couple of other things. </p><p></p><p>At the risk of sounding like a pitch, this closure isn't something you have to deal with any longer if we tune your car. </p><p></p><p>Feel free to contact me directly at <a href="mailto:bj@vmpperformance.com">bj@vmpperformance.com</a> if I can assist you further.</p></blockquote><p></p>
[QUOTE="VNMOUS1, post: 15239089, member: 36794"] Dinosgt, the knock sensor limit statement is incorrect. We can command the amount it pulls, the sensitivity, the rate in which pulls as well as how it recovers. As a rule, it will pull quicker than it adds back. So, it's important to have the calibration spot on and not pull any at all. The Spark Adder For A/F @wot will add x amount of timing if everything is in good shape. It's far more efficient and provides better power to command a little less timing in the table and let it add than to have the net result of rapidly pulling then slowly adding back. The KS adding and Spark Adder for A/F@wot are two different things btw. Downstream temps. Ford stock cal pulls at 110f and scales more aggressively moving upward in the table. IAT2 averages 30f above ambient so on an 80 degree day you can be pulling timing while idling in your driveway. This is why a fanned heat exchanger like our Triple Pass Dual Fan unit is SO important. When you have one, we raise that threshold in your cal to start later but act more aggressively at higher temps. Not only does it reject heat but the recovery time is monumentally faster. Throttle angle. Yes, it's 82* at wot. Log both commanded and actual and compare them. It could be shutting due to torque limits, clutch protection or a couple of other things. At the risk of sounding like a pitch, this closure isn't something you have to deal with any longer if we tune your car. Feel free to contact me directly at [email]bj@vmpperformance.com[/email] if I can assist you further. [/QUOTE]
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2013-14 Shelby GT500
What's changed in an aftermarket "stock" tune?
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