2016 Tacoma Dyno Torque HP Crve

By "because of the EPA", do you mean to be a more efficient truck at speed?

 

Look at the numbers you posted. They made 5th shorter, not taller

They made 6th taller because of the rear end

 

Rock Lobster!

 

The 5th ratio in the new transmission is 0.69 which is taller than the old at 0.72. If they used the same tires that's a 0.05% difference due to the rear end change; In my book that's the same. (Plus, I'm sure that is not the exact trans ratio.)

Sixth is taller for efficiency.

Now somebody find/make a dyno so we can move on.

 

Look what you wrote. One of them is incorrect

 

One refers to transmission, rear, and tires together as I said.

The other only refers to transmission which is what you were talking about.

 

bump. Seriously, no dyno's have been posted yet? It's a new engine folks! Isn't anyone else curious?

 

Yes, very curious. I joined this forum last week specifically to find some dyno's in comparison to the 2nd gen... all I've gotten was some tired old joke showing a dyno curve edited to look like a dinosaur (which, much like the real dinosaurs, dates back to the Mesozoic) and someone telling me to just "go drive one" if I want to know.

 

That's not a dyno curve, it's an Atkinson use chart

 

Nothing to do with Atkinson; D4-S.

Edit: D-4S

 

More accurately, it is a load map that illustrates the distribution of fuel between the two injection systems. It is not a torque curve at all.

 

Oh yeah, shoot, sorry.

I was close, though. Ehh

 

Here is another version from 2GR-FSE which explicitly states rpm v torque instead of engine speed v load. So, why isn't the upper curve a torque curve?

The problem is that this diagram from the 2GR-FSE is identical to the one from the 2GR-FKS (Tacoma); so, it is not likely the curve we are looking for.

 

"these aren't the curves your looking for"

 

The top line may be a suggestion of the actual torque curve, but without scaling and units of measurement, it is meaningless as actual torque.

The original map in question represents load vs rpm. Load can be expressed several different ways, such as throttle position %, manifold pressure, or mass airflow. We all know what rpm is.

Choose any particular spot on that lower line. All the map is saying, at this rpm point, less load (below the line) means you will be using both sets of injectors, and more load (more throttle - above the line) means you will be using the direct injectors only - port injection shuts off.

Another way of saying it, is the port injectors only work in the lower speed and throttle ranges, and when they shut off depends on the rpm and throttle position - represented by the lower line.

It might be more helpful if I drew a scaling graph on top of the Toyota graph.

 

Could this be what we are looking for from the Chinese Prado brochure? They list the engine as 7GR-FKS; but, it has the exact same specs and almost exact output as 2GR-FKS (Tacoma). 365Nm=269lb.ft@4500; 206kW=276hp@6000

I divided the graph into 1k rpm assuming that it starts at 1k and ends at 7k (and added a 1500 rpm line). Assuming it is an accurate graph:
At ~1500 it is ~220 lb.ft. (that's as high as 5VZ max torque).
From ~1700 to ~6100 it is above 235 lb.ft (89% of max).

 

Wow, this is intriguing!

If this is for real, it's nice to see the torque coming on pretty strong at only 1500 rpm. Also, the significant mid-rpm dip in torque suggests an opportunity for consumer tuning, if only the ECU was accessible.

If the two Y-axis were equalized, would the lines cross at 5252 rpm?

Thanks for posting this, and for doing the math conversions for us.

Frank

 

You would need to convert from Nm and KW to Lb/ft and Hp, then scale both sides equally in order to get the curves to intersect at 5252, but once you know that, it is pointless.

Tq and Hp are always equal at 5252 rpm. Below that, torque is higher. Above that Hp is higher.

The mid rpm dip is likely due to a combination of the intake runner tuning and the tuning of the variable valve timing attempting to compensate and flatten the curve. Aftermarket tuning may show some gains at the expense of fuel economy and emissions.

 

Nice find. The first leaked docs about the 3rd gen had the engine listed as 7GR. The power numbers are a bit different probably due to slightly different emission standards between China and USA. It would be nice if Toyota would just release their SAE dyno charts like they do for a lot of their other engines. Instead we have to rely on intrepid internet detectives to pull that shit out of the bowels of the internet.

 

The dip is from the change over from multiport to direct injection IIRC.

Yes, the Torque and HP should meet at 5252 but this is a graph of KW (metric measurement of HP) and Nm (metric measurement of torque). Also bare in mind this is only a graphical representation of the dyno curve. Both HP and Torque axis are also independent of each other.