Port vs direct injection on Tacomas.

I know Tacomas use both types of injection systems on the Tacoma ( mines a 2017 TRD Sport) . What I was wondering , because I can’t seem to find a lot of information on this, is when specifically does the truck switch between the 2 systems? Is direct injection used when cruising with the Atkinson cycle and port used during acceleration ? Just trying to figure out when each is typically activated. Even a link to a document or paper describing this would be great.

 

Some engines run port and/or DI, the 2GR in tacoma does not. It cannot run port injection only by design.

It runs DI 100% of the time, and port on warm up, during cycles at idle, and sometimes load.

The idea is the keep the valves clean, which in turn keeps emissions consistent longer.

They also raise combustion temps to warm up the catalytic converters faster without air pumps or egr.

Ultimately the port injectors on tacoma is for emissions, it doesnt help with performance.

I can't share toyota documents but hopefully someone can find the graph with DI+Port and DI only.

 

I dont get why you would put the port vs direct when both are working together. Heres a video that explains more in detail yet its simplified
https://youtu.be/_KMyfpop9Fs?si=oWcIBcDx6YklGFnv

 

The 2024 highlander switches, new tacoma may switch as well.

 

Page 104

 

Holy moly did you find that fast, and what an obscure location lol.

We reference that chart often when explaining operations.

Techs ask why you cant switch all cylinders to port, only one at a time. I show this graph.

 

I wonder why on page 69 its says octane rating of 91 or higher

 

IS350 bruh

It's the 2GR FKS data sheet, usually the first production of it gets the huge sheet.

God damnit Im wrong.

Look at the HP output.

I'll leave this up to embarrass me.

 

Its all good im sure someone knows , but nonetheless they share the same engine

 

I wish 91 octane unlocked 311hp and we could all love the 3rd gen unanimously.

 

Direct injection only mode starts when you reach above 70-75% of engine load . You can see it in 6th around 1700 rpms.direct injectors spray at 320°
The rest, Either mode (direct injectors spray at 270°) and Port.

 

Is that 91 in the document maybe meant to be research? The owner’s manual says research octane 91, and 87 normal.

 

My guess is,

It's there because the engine makes "the most" power with 91.
A bigger "HP" number is better than a lower HP number.

I am probably wrong. But it's an answer.

 

I could see it going either way. I definitely feel like mine makes more power on higher octane due to not retarding timing as much. But, considering sometimes they use the research number and not the normal number, it’s hard to say. 87 octane is 91 research octane, so I could see maybe the document meaning that.

 

I have no idea.
But not all 2GR-FKS engines are the same.
It's in no less than 14 different vehicles.
And each vehicle serves a different purpose.
The car engine wont be tuned like a truck engine.
Depending on the application, even the top RPM is different.
I wouldn't be surprised if the cam profiles were different between applications.

 

Yeah, I understand all that and the Tacoma version is very differently tuned from the rest of them. Maybe for longevity while doing truck type of work? I don’t know.

I do know that @Jeff Lange has detailed out the parts before and from what I remember, the Tacoma version was mostly only different on the block itself, and not much else. IIRC the cams, crank, valves, and some other parts (heads?) were all the same. The motor was almost called the 7GR since the block was much different than the other 2GRs. The Tacoma 2GR-FKS block is more similar to the 1GR-FE than it is the other 2GR-FKS’s. It has a different bellhousing and different strengthening ribs than the other 2GR-FKS motors.

 

I didn't know all that, I know more about the 4.0.
And at that, I don't know much.

 

It is the same part number for 300+hp Camry and Tacoma. Its all about ithe intake and tuning

 

Seems like it. A quick search (not a thorough search by any means) shows this.
https://www.tacomaworld.com/threads/redline-2gr-fks-tacoma-vs-highlander.742935/#post-26450219

To be honest, I out grew "HP number days" years ago.
I'm more of a "As long as it gets the job done" type of a guy these days.

More than likely my next truck won't be a Tacoma. I find the extra power and capabilities of a full size truck better for towing my trailer.
My Tacoma is getting the job done, and I plan to keep until it "dies". But I tow more now than I did back when I bought my truck. When the Tacoma dies, I'll look at a Tundra or an F-Series.

 

Not extremely quantitative, but...



Jeff