2016 Tacoma Dyno Time!!!

That is where peak torque is on my 2002, between 3 and 4k rpm. I get that power output to the wheels will be less than from the actually engine, but shouldn't the torque curve be the same as what Toyota advertises at 4600?

 

Graph looks strange to me due to torque dips and peaks. Not sure why those are so pronounced. Also run should be made at tranny's 1:1 ratio to minimize gear ratio deltas. Autos are next to impossible to get good results on since they cant lock it to a gear.

 

Fuel remap may find a small bump in torque output but the only thing that's really worth fixing is that dip at 4300. Other than that it's a pretty smooth and decent torque curve..

 

Is OP's engine modified somehow? So many questions! Also, I too want to know why there are so many peaks and valleys between 2000 - 5200 rpm.

 

The peaks and dips are so pronounced because of the Atkinson cycle vs. Otto cycle and Direct vs. Port injection. The engine operates in both cycles and uses both injection types as needed.

 

I'm not smart enough to tell you why they are so pronounced. However I can tell you that while driving the manual I can clearly feel those peaks in tourqe number in the same spots.

 

Which graph are you looking at? I only see the k&n one

 

I'm looking at the photo of the computer screen in post 101.

 

I am not sure this is correct.

 

"That's a little silly. I would assume that it would select one mode that makes the most power for a full load but then again it is a Toyota."

Toyota engineers have said that the engine operates in Atkinson cycle for efficiency and switches to Otto cycle for the power. If you gradually transition the throttle, Atkinson cycle is how the engine will operate. If you mash the throttle, it will switch to Otto.

Injections methods are similar concept from what I hear, but less is said about that.

 

My conclusion from this dyno test is that I don't have a conclusion.

 

Missed that one, definitely needs a fuel remap to smooth out the torque curve. But as advanced as this engine is it may need more tweaking. I would disable Atkinson altogether if possible then dyno.

 

I guess without a gen 1 4.0 or a gen 3 auto doing the same test on this machine, it's not really possible to see how the new 3.5L compares. Just by going off the dyno chart OP posted, it would seem that the torque curve isn't as bad as people said it would be. While the 3.5L is meant to rev, you still get some pretty good torque sub-4200 rpm.

 

Engine cycles are my only thought. I'm guessing (just my hunch) that Toyota might have programmed the computer to run on Atkinson for low rpms and Otto for higher rpms. Again this is just a guess. Until someone is able to "unlock" the engine control module and tune it, we likely will never know the real cause.

 

DUH!

 

Why do the torque and power curves not cross at 5250 rpm? Something looks off with that chart.

 

It looks like as the load is increased the Torqe is sawtoothing because of ECU controlled fuel limitations. Just a guess.

 

They would if the Y axis were the same scale.

 

Is this the only known dyno chart of the 2016 out there?

 

I haven't driven the 3rd gen, so bear with me. My understanding though is at full throttle, which you should be in for a dyno run, that it will not drop into an Atkinson cycle or injection mode, they should stay in full power mode, eg, open loop.