Torque limit on our 10 speed transmission

From what I have read the Tundra transmission has a max capacity of 479 ft/lbs. Exactly what our engine is rated at except the hybrid at 583. The electric motor is between the engine and trans so it would have to absorb all of it right? Not sure that bodes well for long life especially pushing it hard or tuning for more go...so am I missing something here?

 

The AWR10L65 rating of 650nm (479 ft/lbs.) does seem like more than just a coincidence. First off, I don't worry the slightest about the transmissions ability to handle the torque, as it has performed surprisingly well in any scenario I've thrown at it. With that said, I do wonder if the engine torque is being electronically limited to 479 ft/lbs specifically because of this rating? Considering the engine is forced induction, that is very easy to do, and seems fairly logical. What came first, the chicken or the egg?? Whatever the case, I have regularly drove mine up and down large mountain passes while towing relatively heavy loads (in excess of 5k) with negligible transmission temperature rise throughout the summer months. Using Tow/haul mode, the torque converter lockup sequence is optimized to limit heat build up when towing or hauling heavy loads.

I realize this is not a scientific metric, so take it for what its worth. After doing a drain and fill (1 gallon of Redline synthetic WS spec fluid) at 10k, which was purely out of curiosity and of course not necessary by any standard, there was zero sign of over heating or burnt transmission fluid that is typical with high wear / high temp situations. Aisin is known for building some stout transmissions, and I have no reason to believe the AWR10L65 will be any different.

 

It’s definitely the same transmission. I wouldn’t worry. The capacity rating might be for the weakest gear. Modern TCM controls can have torque limits for each gear to protect the transmission and keep it from slipping. I doubt any OEM would just “send it” and not do any limiting based on rated capacities, especially conservative Toyota.

 

I wonder if this is why 1st shifts early on WOT.

 

well thats interesting, coz the diesel f33a seems using the same trans? and that engine rated at 700nm from factory. even more the dakar lc300(which by fia regulation, they should not change the hardware of engine and trans, only race version programs) have tuned up to 815+nm of torque

 

If I'm thinking correctly this early in the morning the V6 has a power pulse every 120° of crank rotation. An electric motor smooths out the power into many power pulses spread out over 1 revolution. Maybe the overall torque over time is much higher on the hybrid but the instantainous torque pulse is only slightly higher.
A comparison was made of crankshafts from a Lycoming 0-360 horizontally opposed 4 cylinder and a Plymouth 360 V8. The airplane engine crank was much larger. 1,) the power pulses were fewer and 2,) the car engine had a torque converter to smooth out the power pulses.
One of my hobbies is building RC airplanes. I started over 40 years ago when single cylinder nitro 2 stroke diesel engines were the norm. These models needed to be so overbuilt because of that single power pulse every revolution. I now build only brushless DC outrunner powered models which have the power spread out over 36 pulses per revolution. The difference in the weight of the airplane is astounding. I have a 54" wingspan Taylorcraft that weights 10 oz. That same size plane built with the old glow engine would weigh very close to 10 pounds.

 

Retired...finally: You just struck a nerve with me (in a positive way). I've been flying R/C aircraft for 40+ years, fixed wing and helicopters. 70cc gassers down to micros. Was a die hard glow power enthusiast until modern lipo batteries and brushless power systems came of age. Now only electric or gassers. Don't miss the slimy exhaust residue from glow power engines one bit...
My son and his wife own a Cessna 172 Skyhawk with a Lycoming 360. She's a CFI and a captain for a Jet Charter service, he flys for fun...

Back on topic, I personally believe Aisin Warner historically makes some bullet proof transmissions, I wouldn't worry too much about the new AJA0E/F transmissions