Absurd no manual transmission
#91
02-08-2016, 08:12 PM
Cargo Master
To be fair, most torque converters can multiply torque as much as 2x. So multiply the 3.97:1 first gear ratio of the 6R140 by 2 and you may have an equivalent as high as 8:1.
The current automatic behind the 6.7L can put more torque to the driveshaft unless the guy with the NP435 sidesteps the clutch.
The current automatic behind the 6.7L can put more torque to the driveshaft unless the guy with the NP435 sidesteps the clutch.
#92
02-08-2016, 08:14 PM
A locked torque converter behaves identical to a clutch that's fully engaged. There's no slip and no torque multiplication; torque multiplication requires slip. It does generate a lot of heat, torque converters are why automatic transmissions require coolers but most manuals do not.
#93
02-08-2016, 08:18 PM
Cargo Master
That's true.
Looks like SuperDuty trucks get the 1410 series u-joint which yields somewhere under 3000 lb ft. I don't know how much torque these SuperDuty transmissions are allowing to pass, but just seems to me that something is absorbing some of the power from today's diesels because I don't see how a 1410 joint could take the full power multiplied by a tranny's low gear ratio without breaking...especially if the truck bed is fully loaded and max trailer weight is hitched behind while on dry pavement. That's not to mention the occasional shock of spinning a tire on an icy puddle and then having it hit dry pavement under heavy throttle. Something is allowing some give.
Looks like SuperDuty trucks get the 1410 series u-joint which yields somewhere under 3000 lb ft. I don't know how much torque these SuperDuty transmissions are allowing to pass, but just seems to me that something is absorbing some of the power from today's diesels because I don't see how a 1410 joint could take the full power multiplied by a tranny's low gear ratio without breaking...especially if the truck bed is fully loaded and max trailer weight is hitched behind while on dry pavement. That's not to mention the occasional shock of spinning a tire on an icy puddle and then having it hit dry pavement under heavy throttle. Something is allowing some give.
Here is what Dana has to say on the subject...
#94
02-08-2016, 09:33 PM
http://www2.dana.com/pdf/DSAG-0200.pdf
Here is what Dana has to say on the subject...
Here is what Dana has to say on the subject...
#96
02-09-2016, 07:27 AM
#97
02-09-2016, 07:39 AM
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You're exactly right about the arms race, everytime one adds 50 lb*ft of torque, the others add 60.
Ya'll are talking about the torque converters, but the PCM and TCM severely reduce the amount of torque that is applied in many situations. I don't know what year Ford started doing it (I assume they have), but you CANNOT powerbrake an 07+ Chevy. It's next to impossible to spin the tires even though on an 2001 with less torque and horsepower you can burn 35" mud grips down to the rim.
Even though these engines are capable of producing 7 million horsepower and 9.5 million pound feet of torque, the computer does not allow them to reach their full potential until the vehicle is in a situation that that application of power will not damage the axles, drive shafts, transmission, etc.....X RPM in Y Gear.......(ie at 55 mph when you go to climb that hill with 15,000 lbs) you don't get it all from a dead stop.
Ya'll are talking about the torque converters, but the PCM and TCM severely reduce the amount of torque that is applied in many situations. I don't know what year Ford started doing it (I assume they have), but you CANNOT powerbrake an 07+ Chevy. It's next to impossible to spin the tires even though on an 2001 with less torque and horsepower you can burn 35" mud grips down to the rim.
Even though these engines are capable of producing 7 million horsepower and 9.5 million pound feet of torque, the computer does not allow them to reach their full potential until the vehicle is in a situation that that application of power will not damage the axles, drive shafts, transmission, etc.....X RPM in Y Gear.......(ie at 55 mph when you go to climb that hill with 15,000 lbs) you don't get it all from a dead stop.
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