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2011-2014 Mustangs
Engine/Tuning
SCJ Monoblade P2112 Code.... discussion
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<blockquote data-quote="Shaun@AED" data-source="post: 15337076" data-attributes="member: 32381"><p>We've been seeing the same issues for years with the MonoBlades.</p><p>I spoke with Mihovetz about it and he says it's due to the tight clearances of the blade vs housing, but we've found these TB's do not stick at idle, they stick on decel, typically 12-20 degrees from full closed. Therefore it's not a tolerance issue with the blade vs housing.</p><p></p><p>What we've found is that it's actually a quite complicated problem. Any little hickup in the gears will cause the throttle to close slower than the ECU is looking for thereby increasing the voltage necessary for the throttle motor to close the blade, which crests a preset threshold and triggers limp mode. A stiffer return spring would solve this but.... the spring tension in the TB cannot be increased as it will trigger an error on the opening of the blade.</p><p>Due to the blade being so large across the X-axis and the fact these engines pull a significant amount of vacuum on decel (26+ inches) the force on the blade is significant at 13+psi (lbs per square inch), especially when you figure this TB has an area of over 13 square inches (that is 169lbs of force trying to bend the throttle blade). Therefore the shaft and blade need to be much thicker/stronger than a twin bore. The drawback is this adds weight and inertia to the blade, and since we cannot put in a stiffer return spring any little hickup in the gears on decel triggers the P2112 as we have a very low margin of voltage error to run the TB properly.</p><p>The GT500's don't have as tight of a threshold for the voltage draw of the TB motor, so they don't suffer from this as often as the Coyotes.</p><p></p><p>The solution is to either increase the spring rate (can't do it as it will trigger limp mode on throttle opening) or decrease the weight/inertia of the blade/shaft and according to Accufab they cannot do this. Therefore, there is no solution aside from running a twin bore on the Coyote applications or run the risk of getting these codes with the MonoBlade. It's roughly a 20% rate we see of the MonoBlades going into limp mode on decel.</p><p></p><p>We recommend the FRPP Twin65 and the VMP Twin67.</p></blockquote><p></p>
[QUOTE="Shaun@AED, post: 15337076, member: 32381"] We've been seeing the same issues for years with the MonoBlades. I spoke with Mihovetz about it and he says it's due to the tight clearances of the blade vs housing, but we've found these TB's do not stick at idle, they stick on decel, typically 12-20 degrees from full closed. Therefore it's not a tolerance issue with the blade vs housing. What we've found is that it's actually a quite complicated problem. Any little hickup in the gears will cause the throttle to close slower than the ECU is looking for thereby increasing the voltage necessary for the throttle motor to close the blade, which crests a preset threshold and triggers limp mode. A stiffer return spring would solve this but.... the spring tension in the TB cannot be increased as it will trigger an error on the opening of the blade. Due to the blade being so large across the X-axis and the fact these engines pull a significant amount of vacuum on decel (26+ inches) the force on the blade is significant at 13+psi (lbs per square inch), especially when you figure this TB has an area of over 13 square inches (that is 169lbs of force trying to bend the throttle blade). Therefore the shaft and blade need to be much thicker/stronger than a twin bore. The drawback is this adds weight and inertia to the blade, and since we cannot put in a stiffer return spring any little hickup in the gears on decel triggers the P2112 as we have a very low margin of voltage error to run the TB properly. The GT500's don't have as tight of a threshold for the voltage draw of the TB motor, so they don't suffer from this as often as the Coyotes. The solution is to either increase the spring rate (can't do it as it will trigger limp mode on throttle opening) or decrease the weight/inertia of the blade/shaft and according to Accufab they cannot do this. Therefore, there is no solution aside from running a twin bore on the Coyote applications or run the risk of getting these codes with the MonoBlade. It's roughly a 20% rate we see of the MonoBlades going into limp mode on decel. We recommend the FRPP Twin65 and the VMP Twin67. [/QUOTE]
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SCJ Monoblade P2112 Code.... discussion
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