2GR-FKS more 'Atkinson' than Prius.

Should pay more attention:
Quote from Seatbelt bracket Mike about cleaning...
https://www.tacomaworld.com/threads/2gr-fks.390119/

Let me know if you would like me to show you how to Google too..

Re-read what you just wrote, atkinson cycle allows to burn less fuel ... less than what normally would be absolute minimum which is how they save fuel. And if you burn less air/fuel mixture (still at correct ratio) than whatever burns it burns with less energy produced, in this case, when idling, that means less energy wasted. If you engine needs to provide power (driving you need more than minimum it can deliver)

So your facts are correct, but you draw wrong conclusions.

 

Actually only 30% are required to have it installed from the factory to preserve the MPG rating.

 

The less oxygen in the chamber, the less fuel the ECM will put in which should be significantly less than without 'atkinson'. So, it should burn less fuel per rev AND burn it more efficiently (at low output). AND, the exhaust valve can stay open until 46.5° past top dead center pulling back in some exhaust gas to further reduce the oxygen in the chamber. (Don't know how much other EGR there is.) I just don't see how all this doesn't translate into significantly better EPA MPGs.

 

Read your article, it doesn't use more gas. Stop it!

Wrong. My facts and conclusion are very correct.

Atkinson cycle does not simply burn less gas, it improves efficiency by using as much of the potential energy created by the detonation as possible. Otto cycle wastes a lot of that potential energy out of the exhaust pipes. Atkinson cycle will give major benefits on the highway, yes while idle, and even small benefits during city driving. Go back to your Chevy forums.

 

Do you have a new number .. ?


Old ones (for 2012) were

https://www.google.com/url?sa=t&rct...sg=AFQjCNHBhY9XwEFLgbtpcfZvxVGg2GDQ-w&cad=rja

Coefficient of Drag
0.357 4x2 Regular Cab
0.368 4x2 Access Cab
0.357 4x2 X-Runner
0.419 w/Off-Road Pkg
0.394 PreRunner Access Cab
0.419 w/Off-Road Pkg
0.394 PreRunner Double Cab
0.419 w/Off-Road Pkg
0.394 4x4 Regular Cab
0.419 w/Off-Road Pkg
0.394 4x4 Access Cab
0.419 w/Off-Road Pkg
0.394 4x4 Double Cab
0.419 w/Off-Road Pkg

 

5 minutes ago you did not know there is cleaning cycle, now you think some leprechauns with tiny brushes clean your fuel injectors ?


Its fuel that is sent through side slits on fuel injectors, so Unless you are calling Mike Sweers a liar its fuel that does the cleaning.

You are so wrong,
Here lets do some numbers..

If my 2007 runs at 0.34 GPH at idle, will 2016 be at:
A The same amount of fuel
B. Less than 0.34 thanks to Atkinson cycle

Simple.
You want me to go to Chevy forum. Why ? Do I cramp your style posting garbage information?

 

Stop feeding the trolls, they'll go away eventually.

 

Is that your actual 1GR idle consumption? I was wondering this. My 5VZ is ~0.32 GPH. (Measured by SGII in LPH, converted to GPH. How did you measure?)

Any guess for 2GR-FKS idle?

 

Yes thats from SGII as well. Interesting so your smaller engine only consumes 0.02 GPH less when idling. Now I don't feel bad.. To give you idea my other Toyota with V8 idles at 0.5 GPH but it has 180 Amp alternator for all the entertainment crap so I think that big difference is not only engine but also all the on board electronics.. my 07 has almost nothing when it comes to electronics so idle draw is tiny.

BTW My 0.34 GPH is when idle. all warm up, no A/C, no radio, no lights.
Whats curious is that with 21 gallons in the Tank we can idle for ..: atleast 61 hours on full fuel tank of gas (nice to know if you ever get stranded in winter)

No idea for 2gr-fks but I would guess if does use Atkinson cycle during idle it should be at least 20% ( its my fake number so dont hold me on this one but thinking 10% saving for D4-S at low RPMS and thinking 10% saving for Atkinson Cycle)
So 0.272 GPH which would make 21 gallon last 77 hours of idle
People who are stuck in California traffic and NY traffic will be thrilled to save money...

 

Hate to break it to everyone but my 03 dc v6 taco with 265/75/16 a/ts gets 16/21mpg acording to my SGII. So 2015 v6 didn't really do and better in that department, just got more power. I bet of toyota put the new 3.5 in a compact truck it would get crazy mileage

 

Don't listen to him. Its been confirmed a while ago by another member that he's a member of the Colorada forums and owns a Chevy Colorado. Probably why he trolls so hard in the 3rd gen section.

Atkinson cycle will benefit you much more than just at idle. Period. Cleaning cycle, as shown in his own link, doesn't burn extra gas. Period.

This troll can be convincing. People who don't know better actually listen to his lunacy and fear mongering.

 

Why not give it another ~10% for being 3.5L instead of 4L? ~0.24GPH? (I'll let you know when I get one in a few months.)

 

That quote from Dagosa fits you very well

You can cook whatever you want in that little brain of yours ...

Check out, they have tinfoil on sale at Amazon

 

Well you have 3.4 and saves you only 0.02 GPH over 4.0 so 3.5 will not get better saving than your engine.(due solely to a displacement difference)
Also Your 3.4 uses belt which is lower resistance than chain. So I can't see them beating your engine.
D4-S will beat both our engines because it gets nice efficiency at idle, and Atkinson will save fuel at idle by not injecting as much fuel as normally would do.
I would say first person that gets 2016 V6 should get that number to see how new engine stuck up to older ones. That will be a true comparison.

 

The "cleaning cycle" just involves injecting more fuel in the intake port, and less directly into the cylinder. The mixture doesn't change, it's just injected farther upstream. The same amount of fuel is burned either way.

In your mind did you envision the engine running super rich and spewing fuel out the exhaust during the cleaning cycle? Did you stop to think that just MAYBE the EPA might have a problem with that?

 

I dont see how that would clean carbon from DIs..



But I see @Jeff Lange is lurking so maybe he can look into Toyota for reference and answer if in self-cleaning mode truck will use more fuel. I don't see how they would clean DI with fuel with out using extra fuel. But I could be wrong.. and there is some kind of miracle process working in the background..

 

Fuel is a solvent. Port-injected engines never got carbon on the tops of the valves because the fuel was always cleaning them. Top of valves never see fuel in a pure DI engine, so Toyota just sprays a little fuel in the intake port from time to time to dissolve the buildup. The fuel still gets burnt.

Direct+indirect injection is not even that new of an idea; VW/Audi have been doing it for a while (in Europe), the BRZ/FR-S had it from the get-go, etc.

Go scrub some grime off your engine bay with a gasoline-soaked rag. Then set it alight; you are arguing that it won't burn, because that gas vanished after it was used to clean.

When in doubt; Conservation of mass, energy, and momentum always apply. This simple concept will save you the embarrassment of losing so many internet arguments.

 

My semtements too. I wonder also if this technology is really that specific to Toyota and Mazda . Aren't we just doing what we used to,,,... Bragging about fuel injection for example when everyone had it regardless. Wow, overhead cams and disc brakes. Reliability has it's down sides.

 

You are talking about cleaning the valves, Thats not what Seat belt bracket Mike was talking about. He was talking about injectors itself being cleaned from carbon build up.
http://wardsauto.com/vehicles-technology/toyota-advances-d4s-self-cleaning-feature-tacoma

Injectors that sit inside the cylinder in own recess. (look at the picture i posted )
No amount of port spraying will clean them look at the Toyota drawing....

 

my problem with DI engines was not the fuel injectors getting dirty, it was the valves. I spent $800 getting the valves scraped by hand in my Audi at 80,000 miles. the port fuel injection will go a long way toward solving the specific problem I had. injectors themselves can be cleaned with an additive if need be.

Carl