TFL: 2016 Tundra vs Tacoma, towing mpg

[Anthony]

They are testing more trucks daily it seems. Today I saw them test their 14 raptor. Also has a 6 speed. It has a little more power, but not much more than the Tundra. Its also heavier, and has 35 inch tires stock. It sat at 2000 RPM the entire time once they were locked at 70 mph.

I still think something was off with their Tundra test.

 

[supton]

Nah, Tundra just doesn't make a lot of low end torque (aka, no low end horsepower). I can't find the 3UR-FE torque curve, but I wrote down in the past some numbers:

rpm tq hp (30% hp less)
1.0k 310 59. 41
1.5k 335 96. 67
2.0k 355 135 95
2.5k 370 176 123
3.0k 385 220 154
3.5k 400 267 187
4.0k 395 301 211
4.5k 390 334 234
5.0k 380 362 253
5.5k 365 382 268
6.0k 300 343 240

5th gear at 70mph is just too tall. With a manual trans, yes it could do it, as you could hold a large throttle opening without it downshifting (plus much less transmission loss). Maybe.

 

[supton]

http://www.ezdries.net/Vidpics/TQ/LC200 5.7 V8 08pdf.pdf

Found a link.

 

[Anthony]

Originally Posted By: supton
Nah, Tundra just doesn't make a lot of low end torque (aka, no low end horsepower). I can't find the 3UR-FE torque curve, but I wrote down in the past some numbers:

rpm tq hp (30% hp less)
1.0k 310 59. 41
1.5k 335 96. 67
2.0k 355 135 95
2.5k 370 176 123
3.0k 385 220 154
3.5k 400 267 187
4.0k 395 301 211
4.5k 390 334 234
5.0k 380 362 253
5.5k 365 382 268
6.0k 300 343 240

5th gear at 70mph is just too tall. With a manual trans, yes it could do it, as you could hold a large throttle opening without it downshifting (plus much less transmission loss). Maybe.



The Raptor makes its peak torque of 434 ft lbs at 4500 RPM.
The Tundra Makes it's peak 401 ft lbs at 3600 RPM.
That graph is somewhat hard to read, but the Tundra should have plenty of low end.

Maybe it is all in the gearing. It does have a 4.30 rear end so I assume the trans is geared accordingly.

 

[rslifkin]

It sounds to me like it's a combo of the power curve, gear spread and trans programming. If it allowed you to get closer to WOT before downshifting, it could probably hold 5th in that situation, but for the sake of being responsive, it probably chooses to drop to 4th (even though an ideal gear would be somewhere between those).