2016 OVTune Tacoma 3.5L Manual Transmission / Engine ECU Reflash

That’s been my experience as well.

I didn’t really wanna have to move to VF, but figured the appropriate tables would be available there eventually. I’m more of a -set it (properly)and forget it- kinda guy.

 

Okay so the ECU is degrading things based on learned parameters.

This is something that will be extremely hard to "tune out" because this exists as *code* not maps/tables.

The ECU takes all values from the tables, uses them in various calculations, adjusts, changes, and modifies the end result based on so many different and complex internal controls.

fixing this would first require figuring out which table data the ECU is modifying, finding the code and altering the algorithm.

This could take *years*.

Even fully understanding the entirely of the ignition control, MBT and cylinder efficiency calculation, ignition burn calculation based on AFR would take me a year or more to fully understand top to bottom.

 

No, or at least not yet. Because modifying them makes it worse. Because the ratio calculations are set in code, not tables. So no way to just "shut it off" without rewriting code.

Funny I had a patch that rewrites the entire ratio routine, skips all stock stuff, uses my designed table.
Released it asa 2.0 beta to test out, and got into the carbon build up mess. (And it did need adjusting for cranking).
So I have a bunch of code I already wrote to just "go around" the stock Pandora's box. But it's in the folder of "not for official use." I actually developed that patch for boost because I got so tired of dealing with the stock junk calculations. I use a version of it for the TT Tune.



This is assuming the surging is related to that.

 

It is definitely something that appears after a long time. Say a few tanks of fuel.

It was more pronounced on the unedited SFOB Prem. It seems softened on my edited version, but I don't know if that is due to the lower octane or the edits?

I understand your thoughts on it though. It would be killer to have a total rewrite, but I can see the pitfalls there without a full program and controlled testing.

Still, the 2.0 tunes are great as are the edits. I'm looking forward to the upcoming goodies.

 

Can't see how it would hurt it.

Also, it only constantly gets flashed if you're constantly flashing it.

If you flash it to say, 2.0, then follow along in the VF thread for a bit, then maybe make some tweaks, save it as 2.Slow or 2.1 or ILovelucy.0 and flash it, whamalam should be good to go.

 

My truck has been flashed well over 100 times. Twice today, just testing things that I changed in Vftuner.
I haven’t heard of anyone yet having a problem from too much flashing.

 

Uh yeah you should do that. b14 was pretty noticeable for me

 

Everything you need is found here
https://www.tacomaworld.com/threads/ecu-tsb-update.562550/

 

I've flashed my trucks ECU well over 1000 times. It doesn't hurt anything

 

If you have been tuned for 3 years, why did you say you are concerned about the health of the motor over the long term? If you're concerned, wouldn't you have returned to stock long ago?

 

I feel this is a more prevalent issue when transitioning from low load to medium or high load at low rpm.

I dont reset my learned values ever, even for major changes.

If you wouldn't mind answering some questions.

1) the FOB files you made to eliminate atkinson cycle, did you do this through VVT or elsewhere? looking into the intake maps, at low load and low rpm the advance is 0 degrees. but at high load low rpm the advance is between 30 and 70 degrees. seems like a lot of advance. - im assuming the 0 degree advance is the atkinson zone. i raised those values to add more intake advance, in theory increasing the amount of air and compression at the low load and rpm area and lessening the transition zone between low rpm and low load to low rpm and high load. it seems to have helped with that surge, but not 100% sure.

2) the ACIS low vs high - is low for low load and high for high load? ie, it opens the ACIS valve earlier on low load vs high load? if it is open during low load and you stab the pedal does it close and then reopen at the high load location?

3) when the engine is cold, it runs really really good, it seems to only happen when its warm. is the engine trying to run too lean or with too much ignition advance and knock correction is dragging it down?

4) how can we monitor or log this stuff and have you look at it , which PIDs from your software do we need to log?

 

I was searching "rev hang" today and stumbled upon your post. I was reminded today about how irritating the rev hang is in a spirited 1-2 shift.

Has this really not been completely addressed by now in 2.0? Does anybody tune it out or is it some hard coded feature of the ecu?
I updated to the newest calibration from toyoda (0b14?) and it drives the way it should have new, but that dang rev hang is obviously still there.
I would literally buy the tune just for the elimination of this "feature". But this post made me doubt. I could have sworn many months ago, the rev hang issue had been identified.

 

Yes. 04B14 Stock is really good.

You're right, OVT 2.0 does not address Rev Hang yet, but keep an eye out, there is a map edit coming in a future version of vF.

 

Good to know thanks!

 

You're welcome!

 

What i found is that i could almost completely eliminate rev hang but in the process i just eliminated the ability to accelerate at higher throttle.

It was a mix of the primary throttle table and the request to air load tables

You can do the same thing by just not accelerating hard.

So i abandoned that quest and went for smooth performance while we wait for Matt to release more things

 

Having troubles. Got TS Downloaded all good. Wants me to update anytime I try to connect. What's the go-around..?

 

See the 1st Post in the ECU Update thread. This is explained.

Basically, close that, turn off wifi, and continue on.

 

Thanks. I feel dumb for missing that part. lol...

 

No worries!