2GR-FKS Direct Injection

What happened with the IS250? Do you have any evidence on the rich claims of the 2GR-FKS? I'm not saying you're wrong, I just want to get to the most correct information.

 

4GR-FSE came with D4 system (direct injection only) and folks had issues related to carbon build up.

Black box is DI only mode. Thin blue line inside of kit is about Lambda 1. Lambda dips to 0.814 (AFR 11.9). here are fuel trims for this lambda


Fuel is not added and being taken away.




AFR in the article is a not AFR we measure by O2 sensor. This is more internal combustion process

 

AFR is AFR, internal or turbine; Though the AFR for Stoic. is different for different fuels being burned, so maybe what you are meaning is that the 50:1 AFR mentioned in the turbine does not directly correlate to a 50:1 for a gasoline engine (though as a description of being VERY LEAN, it holds true for both).

More important is that the the conversation is largely centered around reducing oxides of nitrogen (NOx) while increasing performance and economy. NOx occurs at high temperatures, and in an internal combustion gasoline engine; NOx historically increases with lean mixtures (in conflict with best fuel economy); but for Kerosene (jet fuel) and Diesel, this is not the case. As the video shows, lean burning of jet fuel dramatically Decreases NOx; opposite of gasoline internal combustion (historically). BTW, running a diesel engine VERY Lean also runs cleaner than running rich; and is why every diesel vehicle produced over the past 2 decades has been with Turbo.

This is where Gasoline Direct Injection (DI) has developed some advantage. DI under certain circumstances, with specially shaped pistons and combustion chambers, has allowed computer controlled fuel injection to be precisely injected during combustion, in a manner that burning the fuel in an environment that is full of oxygen (very lean burn), the burning is controlled (slowed) in a manner to reduce combustion temperatures and avoid making NOx; by spreading the injection (burn) over time. I believe this is commonly called maintaining a flame kernel. If you have ever seen an experiment that shows how low-octane gas burns like an explosion, and high-octane gas burns more like a grass fire (not slow, but more controlled and slower); then you might understand how the controlled burning spread over time, has advantages to our gasoline engines.

The major motive for lean burn in gasoline engines, is less un-burned fuel out the tailpipe, for better fuel economy; but unless accomplished without increasing NOx, it is unacceptable. DI is developing as means to accomplish this. Perhaps, someday, the gasoline engine will run with a wide open air intake (no throttle body), and control power and emissions solely by varying fuel injection; similar to Diesel engines?

 

The 2gr-fks on the 3rd gen tacoma from the factory, the rev limiter is set to 6000 rpm, however the highlander with the same engine revs to 6900 why is that?

 

Fast Forward to 5:35

https://www.youtube.com/watch?v=ei5yC4IdDhs&list=PLeFzfl0Q8rQXkSiT50RyVAkC_JIHXw318&index=2

 

Thank you

 

Could i just upgrade the valve train?

i ran into a site that sells 2GR-FKS performance parts, I’m thinking billet cylinder heads, upgraded valve train, upgraded valves, upgraded connecting rods, stage 2 cams.

If I wanted to put harrop super charger how much psi is safe with, and without rebuilding the engine.

and if someone rebuilt his engine please give advise

https://www.monkeywrenchracing.com/...ategories=1&attributes=1&tags=1&sku=1&ixwps=1

 

I am can't really say yes or no about that. You would need someone who knows this engines very well and done it. 2GR-FKS isn't just in Taco, its in other cars too, Lotus car too btw, also in Bolwell Nagari 300. So that will make it easier probably to find someone. The engine is similar in highlander and lexus models but its not same since Taco is a truck and has different way of needing power. Its same as before 1GR-FE 4.0 was in 4runners, Taco, highlander but it still felt different.


That guy in video has his own shop in IL https://tccnautomotive.com/, but he works on repairs. Not sure he is doing any upgrading etc. You can prob email him and see what he has to say

My advice would be, don't do something that can go south and you may regret it. If you do decide to go thru with it, make sure its reputable mechanic who can offer some warranty after work.

 

Thank you, right now it’s just an idea and if I ever do it I’ll make sure to update

 

Do research and make sure you know the effects of these parts. I don’t know of any other legit performance mods for the 2gr-fks other than the Magnuson supercharger.

It’s interesting that the linked website lists fuel system upgrades. I’m not a forced induction guy, but I have read enough to know that boost on the 2gr-fks is limited by the fuel system and few of none solutions exist. I would check out the various forced induction threads on here.

Keep in mind that the 2gr-fks isn’t a performance modders dream engine. There’s not much support out there.

https://www.tacomaworld.com/threads...acoma-unboxing-install-diy-dyno-video.693562/