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SVT Shelby GT500
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<blockquote data-quote="mustangc" data-source="post: 11006048" data-attributes="member: 87570"><p>I know with the Shelby sporting 510 ft lbs of torque that it is tough to categorize a 6-speed transmission with a 375 ft-lb capacity as a 'high-torque' application, but it is. A little bit of gear whine is perfectly normal in a high performance application. It is impossible to diagnose a 'normal' vs. 'abnormal' noise over a forum, so my advice to your friend is to test drive another 2011+ mustang with a manual trans and compare. If concerned, take it to a dealer for evaluation.</p><p></p><p>As for the question, "how can an OEM spec out a transmission with a torque capacity lower than the peak torque an engine produces?" Here's how: and I know this because the my current employer provides transmissions to an OEM manufacturer or two...</p><p></p><p>First, the torque capacity of each gearset is independent. Meaning that the torque capacity for first gear is different from second, which is different from third, and so on. The spec sheet lists the lowest torque rating of all of the gearsets as the overall torque capacity. Now, when an OEM sends out a quote for a certain application, and the supplier has an off-the-shelf transmission that is close, here's what happens: rather than retooling to upgrade the gearbox at an enormous expense, the OEM and the supplier design team will get together and configure the engine parameters to work within the constraints of the transmissions limitations. In plain English, that means that the OEM can limit the torque production of the engine in certain gears and certain situations. ;-) The OEM still gets to advertise their peak torque value because the engine really does peak at ### ft-lbs in say, fourth gear. But only the OEM and the supplier know that several of the other gears are torque limited by the PCM to a lower threshhold.</p></blockquote><p></p>
[QUOTE="mustangc, post: 11006048, member: 87570"] I know with the Shelby sporting 510 ft lbs of torque that it is tough to categorize a 6-speed transmission with a 375 ft-lb capacity as a 'high-torque' application, but it is. A little bit of gear whine is perfectly normal in a high performance application. It is impossible to diagnose a 'normal' vs. 'abnormal' noise over a forum, so my advice to your friend is to test drive another 2011+ mustang with a manual trans and compare. If concerned, take it to a dealer for evaluation. As for the question, "how can an OEM spec out a transmission with a torque capacity lower than the peak torque an engine produces?" Here's how: and I know this because the my current employer provides transmissions to an OEM manufacturer or two... First, the torque capacity of each gearset is independent. Meaning that the torque capacity for first gear is different from second, which is different from third, and so on. The spec sheet lists the lowest torque rating of all of the gearsets as the overall torque capacity. Now, when an OEM sends out a quote for a certain application, and the supplier has an off-the-shelf transmission that is close, here's what happens: rather than retooling to upgrade the gearbox at an enormous expense, the OEM and the supplier design team will get together and configure the engine parameters to work within the constraints of the transmissions limitations. In plain English, that means that the OEM can limit the torque production of the engine in certain gears and certain situations. ;-) The OEM still gets to advertise their peak torque value because the engine really does peak at ### ft-lbs in say, fourth gear. But only the OEM and the supplier know that several of the other gears are torque limited by the PCM to a lower threshhold. [/QUOTE]
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