2016 OVTune Tacoma 3.5L Manual Transmission / Engine ECU Reflash

Thank you, to add a few extra points:

A true atkinson cycle engine has unequal stroke lengths. Compression and Intake are shorter then the Exhaust and Power strokes. This is an otto cycle engine that has been adopted to simulate the atkinson concept. The engine, including intake plenum, exhaust manifold, head porting, and cams are designed around this concept.

A supercharger (if sized correctly) can make boost very quickly as the belts directly drive the charger. Using an atkinson cycle with boost creates what is known as a miller cycle. Im sure its possible to use the cam timing to go from a miller concept to a normal otto cycle and make more power with the same supercharger, the issue is getting the charger sizing correctly to fit both use cases. See here: http://jimroal.com/pic/boost.gif

 

Well sorry that I don't have the time to obsess over engine cycles since I work about 12 hours a day 6 days a week

 

You have the time to postulate and conjecture about engine cycles, that is until you are proven wrong, friendo

 

Waiting for Matt to chime in on the whole process instead of a bunch of keyboard warriors who think they know it all. Alot of speculation being tossed around. If it were as easy as some think we would have boost from multiple companys by now ide imagine...?

 

Ok hoss, let's stop the puffy chest horseshit and talk some shop. You guys keep shouting about the 2GR-FKS being a simulated Atkinson cycle engine. Well yeah, take a look at the REAL mechanism:



Holy crap! The inventor himself realized that this was almost impossible to balance properly, and subsequently went through two more variants so that his engine could run at "high speed" - LOL 600 - 1000 rpm!. That last variant was actually a two cycle.
Can we get past the true/simulated argument and on to the more important stuff please?

WRT the miller cycle info posted calmly. Thank you for that. Very informative.

 

All I'm really saying is the reason it hasnt been boosted has nothing to do with the "atkinson" function. It most likely has everything to do with the engine management being so difficult. Who else tunes these engines to the degree OV does? Nobody AFAIK.

 

Lol, puffy chest. I was making fun of him for posting drivel that he knew nothing about, and then saying he didn't have time to learn about it. If you read my post, you would see that I wrote it is not a true Atkinson engine, but a simulated Atkinson.

Edit let me make it clearer - the point of the Atkinson cycle is to reduce engine displacement in a gas engine, so you can burn less gas per rev. Usually you can't do that, because it will lean out. Instead of doing it the way mr Atkinson tried (which didnt work), Toyota accomplished it through valve play, SIMULATING an Atkinson cycle.

 

I was merely speculating. Then I tried to have a civil discussion. Then people flipped out for no reason. Is it illegal to speculate things?

 

Ok, I understand now. You're no better than the school yard bully. Got it

 

And THIS is going to be the crux of the issue IMO. It's been a bastard to get this thing tuned reasonably well and it's fucking NA!

Mat had to play with VVT and actually extend Atkinson functionality to stop my engine from stuttering like mad during testing. It was so bad I couldn't run 1.03B/C 91 in the 2200-2500 range under light to moderate load - drove me nuts. One file later and he had it smoothed out completely. Now, that was my truck and a few others (across different ECU's BTW). Other guys had no problems at all and thought I was just whining.

 

For the record, I know what the Atkinson cycle does and why Toyota implemented it. I've read about it and watched the videos long before this discussion. Again, why hone in on the simulated part - we know lol.

 

Is this the alpha thread now?

 

Dude, I've seen ppl get banned for posting pics like that.. check the memorial thread if you don't believe me. Just a PSA, I could care less what anyone thinks of him.

 

Yes, all the automatic guys found out this is where the action happens

 

No actually, trying to steer towards a better discussion on boosting this engine and whatnot.

 

Thought I'd inject a little levity but ill take my licking if necessary.

I read about 240 of those pages in the weeks between test drive and when I took delivery, until I realized there was an m/t thread. I saw a certain man's vacation photos...

Anyway.... patiently waiting until Matt is back to buy my own kit, and maybe I'll shut up until then. Then post my order #

 

I hear Mr. bubba is selling his kit.

 

halibut v. anchovy

 

Title match. Taking bets now.