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2013-14 Shelby GT500
What's changed in an aftermarket "stock" tune?
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<blockquote data-quote="Dinosgt" data-source="post: 15238309" data-attributes="member: 169099"><p>Thanks to to you both for the replies. </p><p></p><p>I appreciate the real world experience on driveability lmatk. Also, I wouldn't expect to get any guarantees on safety, but I also don't want a tune that squeaks every last drop of power out when conditions are ideal, vs one that accounts for real world driving conditions ( high heat, variable fuel quality at your local pump, etc.)</p><p></p><p>BJ - many thanks for the reply from a guy who has tuned more cars than most of us can imagine. I don't want the secret sauce in this thread, as I understand your hard work, as well as other reputable tuners is at stake, but I am just trying to get some basic understanding of what I am "giving up", in a tune. </p><p></p><p>For example, a very reputable tuner told me that Fords PCM wil only pull a max of 1 degree timing when knock is detected, but other lookup tables are used for additional timing considerations if needed (IAT2 for example)</p><p></p><p>Forgive my ignorance, but if we go to a more agressive spark curve with a leaner mixture, will the knock retard function be relevant anymore? I know it will still " work", but if we added in some more aggressive timing, and its limited to pulling only 1 degree, it seems that we have essentially negated its function.</p><p></p><p>Also, I have heard that Ford agressively starts pulling timing at IAT2 over about 130 or so. If we change that as well, same concern? </p><p></p><p>I am presuming most tunes turn on the intercooler pumps sooner than Fords which I think is at around 110 or so (from my data logging this seems to be the spot).</p><p></p><p>Finally, I noted that I only see about 65-70 throttle on my datalogs. I presume that this due to some type of clutch protection of torque limited function? (BTW this with the trac OFF). If we tune that out as well, and go with commanded WOT at 82% across the board, what do I "lose" in that change? Will I toast the clutch in short order for example?</p><p></p><p>Again, many thanks for the insight.:beer:</p></blockquote><p></p>
[QUOTE="Dinosgt, post: 15238309, member: 169099"] Thanks to to you both for the replies. I appreciate the real world experience on driveability lmatk. Also, I wouldn't expect to get any guarantees on safety, but I also don't want a tune that squeaks every last drop of power out when conditions are ideal, vs one that accounts for real world driving conditions ( high heat, variable fuel quality at your local pump, etc.) BJ - many thanks for the reply from a guy who has tuned more cars than most of us can imagine. I don't want the secret sauce in this thread, as I understand your hard work, as well as other reputable tuners is at stake, but I am just trying to get some basic understanding of what I am "giving up", in a tune. For example, a very reputable tuner told me that Fords PCM wil only pull a max of 1 degree timing when knock is detected, but other lookup tables are used for additional timing considerations if needed (IAT2 for example) Forgive my ignorance, but if we go to a more agressive spark curve with a leaner mixture, will the knock retard function be relevant anymore? I know it will still " work", but if we added in some more aggressive timing, and its limited to pulling only 1 degree, it seems that we have essentially negated its function. Also, I have heard that Ford agressively starts pulling timing at IAT2 over about 130 or so. If we change that as well, same concern? I am presuming most tunes turn on the intercooler pumps sooner than Fords which I think is at around 110 or so (from my data logging this seems to be the spot). Finally, I noted that I only see about 65-70 throttle on my datalogs. I presume that this due to some type of clutch protection of torque limited function? (BTW this with the trac OFF). If we tune that out as well, and go with commanded WOT at 82% across the board, what do I "lose" in that change? Will I toast the clutch in short order for example? Again, many thanks for the insight.:beer: [/QUOTE]
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2013-14 Shelby GT500
What's changed in an aftermarket "stock" tune?
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