High RMP

I have a 2018 tacoma TRD offroad 4x4. I recently did a 6in lift with 33s on it. My rpm has been running much higher. Is this normal?
Before it was around 1800-2000. Now it’s 3000-3500 at 72mph.

 

Great photo! Do you know what gear you're in? My guess is that the effective taller gearing is causing your transmission to shift down a couple of notches. Try going into S mode and see what gear you're really in. And you know that both your speedo and odometer will be off now. The only real fix is to replace the differential gearing with what it appropriate for that tire diameter.

 

Yeah pretty much what he ^^^ said. Your truck is just in a lower gear trying to push your truck along.

 

You are joking, right?

 

You are probably in a lower gear and if you didn't get your speedo recalibrated you are going about 78, not 72.

 

Even at 78 my tach is at 2000. Bone stock though.

 

OP,

Why would you lift 6 inches and put larger tires on a truck and expect even the possibility that you could get decent mileage?

 

More air going under and over. Super aerodynamic. Fuel sipper

 

Depending on weight and width of your new tire and wheel package, plus the height you're probably lucky to see 5th at +70 and without a speedometer re-calibration, probably tracking closer to 80 at that speed. You're probably never in 6th anymore especially if you use cruise a lot.

2 years ago I upsized +1 my stock OR tires to 265/70/17 then shortly after got a speeding ticket. I had the speedometer checked when I went to court and below are the results.



Dyno operator told me he usually sees a +/- 5% error for all factory calibration values on stock tire diameter so the +1 upsize and +5% error from perfect calibration gives me the value recorded.

https://www.tacomaworld.com/threads/cold-feet-about-larger-tires.442229/page-5#post-12874487

First get an idea how fast you're really going then correct as needed. FYI when I'm certain I'm in 6th gear at 70mph I'm usually running about 1800 rpms.

 

Not sure if the OP is running a 285 or a 255/85/16 which is a true 33 and a very heavy tire.

 

OP is a troll.

If you really need a laymen's intro to this then here.

Lift increase drag resistance. The aerodynamic flow to and from the vehicle is not what you would say smooth. There is so much more air turbulence tumbling through the under carriage that it provides more resistance than stock form. Basically, your truck is a fucking brick with cracks and such.

Tire size: The bigger and wider your tires, the more rolling resistance you have. The drag and frictional resistance increase dramatically with the increase in width and height. Also, increase in weight.

Now, moving the truck at higher speeds with additional air pressure/drag/turbulence and heavy tires requires additional fuel management to move the vehicle. Try running with a parachute for reference. Takes more energy to move.

 

^
You’ve heard this before, but common sense isn’t all that common