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SVT Shelby GT500
Tuning/throttle body issues
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<blockquote data-quote="mdoan" data-source="post: 16004064" data-attributes="member: 44126"><p>The mono blade is a pretty radical upgrade and probably isn’t the best choice unless you’ve upgraded your blower significantly.</p><p></p><p>My understanding is that mail order tuners don’t mess a whole lot with the ‘closed loop’ (ECU learning) programming that controls anything under WOT. ‘Open loop’ programming is simply a fixed fuel map specifically for WOT.</p><p></p><p>Problem is, closed loop is what is controlling your daily drive to work. Stop light idle, low rpm cruise, etc. This is a broad statement, but the TB/EGR are dynamic engineered components that may just not be easily duplicated aftermarket.</p><p></p><p>Speaking from experience, I recently upgraded to VMP Gen 2 (including larger injectors and boost-a-pumps), a 67mm VMP TB, and 148mm jlt cai (up from 127mm prior).</p><p></p><p>Car had power but couldn’t find an idle rpm and struggled a bit at stoplights. Also generally just peaky compared to prior setup w/ just pulley on stock blower + 127mm jlt CAI. I experimented with tunes returning to stock TB as well as for the smaller 127mm CAI (one at a time and both) and found the 148mm to be the primary culprit, but the car still didn’t idle right with the smaller 127mm combined with 67mm tb. </p><p></p><p>As of today I’m still happily running the blower (of course), but with the smaller 127mm CAI and stock tb. Still pulls hard and has stock driveability under WOT. Hope this helps.</p></blockquote><p></p>
[QUOTE="mdoan, post: 16004064, member: 44126"] The mono blade is a pretty radical upgrade and probably isn’t the best choice unless you’ve upgraded your blower significantly. My understanding is that mail order tuners don’t mess a whole lot with the ‘closed loop’ (ECU learning) programming that controls anything under WOT. ‘Open loop’ programming is simply a fixed fuel map specifically for WOT. Problem is, closed loop is what is controlling your daily drive to work. Stop light idle, low rpm cruise, etc. This is a broad statement, but the TB/EGR are dynamic engineered components that may just not be easily duplicated aftermarket. Speaking from experience, I recently upgraded to VMP Gen 2 (including larger injectors and boost-a-pumps), a 67mm VMP TB, and 148mm jlt cai (up from 127mm prior). Car had power but couldn’t find an idle rpm and struggled a bit at stoplights. Also generally just peaky compared to prior setup w/ just pulley on stock blower + 127mm jlt CAI. I experimented with tunes returning to stock TB as well as for the smaller 127mm CAI (one at a time and both) and found the 148mm to be the primary culprit, but the car still didn’t idle right with the smaller 127mm combined with 67mm tb. As of today I’m still happily running the blower (of course), but with the smaller 127mm CAI and stock tb. Still pulls hard and has stock driveability under WOT. Hope this helps. [/QUOTE]
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Tuning/throttle body issues
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