02-20-2011, 12:00 PM | #127 | |
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Maximum gear box torque is maximum torque output. This relates to automatic gearboxes only and takes into account the torque multiplication provided by the torque converter. Although there are ratings for manuals, that rating usually doesn't impact any engineering decisions. Maximum Gearbox Torque rating is guidance for people who might want to change or mod their torque converters or help engineers when the transmission is used in a varity of vehicles like a passenger car and a heavy duty truck. If an engine providing an input torque of 551 lb-ft (1 more than the 550 torque rating) and GM wants to use the transmission in a heavy duty truck, they need to use a torque converter suited for that application. It would produce a 2:1 torque multiplication at/near stall. the 551ft lbs the LSA produces would input x 2 becomes 1102 lb-ft which exceeds the GM Maximum Rated Gearbox Torque of 885ft lbs. This is why the Silverado cannot use the powerful LSA... Maximum engine torque rating is input from the flywheel... Check the PDF again |
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02-20-2011, 12:03 PM | #128 |
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02-20-2011, 12:10 PM | #129 |
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Now that the torque ratings for both possible transmissions are known, how does GM tune the engine to exceed the CTS-Vs 551ft lbs when the 6M and 6A are rated at 551 and 550?
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02-20-2011, 01:00 PM | #130 |
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Pill, you may be misinterpreting the ratings, I understand it's not a rating but a validation, does not necessarily mean that it is all it can handle...a little more research may be in order...
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02-20-2011, 01:06 PM | #131 | |
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Edit: unless GM is over-rating their engines... |
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02-20-2011, 01:28 PM | #132 |
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What's this thing going to weigh? 4200, 4300?
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02-20-2011, 04:03 PM | #133 | |
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02-20-2011, 04:15 PM | #134 | |
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Tremec T-6060 555 bhp 551 lb-ft Hydra-Matic 6L90 555 bhp 550 lb-ft
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02-20-2011, 04:27 PM | #135 | |
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__________________
Looks: AAC P13W DRLs, Heritage Grille, RS Embroidered Headrests, GM Door Sill Plates, GM Premium Floor Mats, Body Color Engine Cover, LLT Mobile 1 Oil Cap, ZL1 Sport Pedals, 3M Clear Bra.
Performance: Vararam Ram Air Intake, Hurst Short Throw Shifter w/ Hurst Hard Drive Pistol Grip, IDEALG Clutch Master Cylinder, RX Catch can, GTO clutch fluid reservoir, Brembo Brakes, 1LE Track Pack, GMPP Exhaust Upgrade. |
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02-20-2011, 05:49 PM | #136 | |
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It is all the same though, a Maximum engine torque rating would be measured higher where a torque capacity would be measured by force/time. One would be more "real world" like a Dynojet vs. a Mustang dyno.. just two different test... Edit: That means, your transmission could have a maximum engine torque rating of 550, because your engine only operates at peak torque for a few milliseconds per shift. But the torque capacity would be much lower because the capacity to do so would reduce the engines life... Has anyone ever had a friend that drove home drunk in 2nd or 3rd gear? He tested his transmissions sustained torque rating... Last edited by thePill; 02-21-2011 at 01:52 AM. |
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