2016 OVTune Tacoma 3.5L Manual Transmission / Engine ECU Reflash

By eliminating rev hang you will save fuel so it should compensate for the elimination of DFCO.

 

Don't apologize for anything, ever

 

Do you have a copy of the 109pg engine description? This guy:
https://drive.google.com/file/d/1ucIo9C_YScC1-jQ4weKRd_1zpORQVlZZ/view?usp=sharing

 

Dude, I know you want this really badly. IMO, if DFCO were to be eliminated completely there would have to be changes elsewhere to improve engine braking when the injectors are on (full lift). If you don't go off road, well I guess this wouldn't affect you quite so much. I did a little experiment quite a while ago, while going down a steep decline in 4low 1st gear. When the truck was holding back nicely and slowing down (above 1300 rpm, full lift), I cut the ignition... the engine braking stayed exactly the same (good) all the way down to just above idle. I then turned the ignition back to run, and immediately the truck began to accelerate until the RPM passed 2500. The cycle then repeated. It's annoying AF and possibly dangerous in sketchy situations.

 

Just in case anyone wants to know what 6900 RPM in 1st and 2nd sounds like.....

https://photos.google.com/share/AF1...?key=R2EzRmNMQTZBSngzSnFHVUFJSjl6dXVZczRwTlBn

 

Is that a standard practice to shut down the engine? I never did any kind of 4/4ing.

 

No it isn't,he was just explaining how the engine should be braking while running. As soon as he turned the ignition on it started giving it gas,no bueno in the situation he was describing. The last thing you want when offroading is a runaway truck from no engine braking.

 

aren't you in Montana? where is all the snow?!?

or maybe everyone has been lying to me about the normal weather in Montana

 

On Monday we had about 4" since then temps have climbed and it all melted. We are supposed to get another 5"-8" this weekend

ETA It is 50F right now

 

Are you tuned, what version?
If so how is it in the same situation?

 

I am running 1.05B 91.

TBH, I've not run 1.05b in the same exact off road situation yet. I can still feel the engine braking "letting go" in 2H at 1300 rpm though (ie slowing down in 2nd gear when fully lifted off the gas), and to the best of my knowledge Mat has not touched DFCO yet.

 

HECK YES. Eliminating rev hang and DFCO based on speed would be awesome.

PS: Love how smooth the tune is (especially at low RPM compared to 1.04) and the tip in (i believe that is what is called) is greatly improved from 1.04.

Edit: looking for engine braking not to suddenly disappear as truck is coming to a stoplight/traveling down a steep grade. Seems like there is some confusion about that.

 

Can anyone ELI5 DFCO?

 

DFCO is deceleration fuel cutoff.

Example - If you are going down a hill in gear, with foot off the gas pedal above a certain RPM, the injectors will shut off.

That is DFCO. This is because the momentum of going downhill is turning the engine fast enough where gas is not needed. As you let off the gas while coasting, the ECU cuts power to the injectors. As long as the engine is above a certain RPM, the rotational energy of the engine powers the auxiliary components like power steering, alternator, etc, but no gas is being injected/burned.

The complaints here stem from running the engine at low RPM, right at the threshold where the engine might start to stumble in some situations (1300?) To stave this off, the ECU adds fuel to keep the engine running smoothly. Once it adds fuel, RPM jumps, and sometimes passes the threshold, cuts fuel, and creates a herky jerky ride by cycling back and forth. In other situations, especially in 4lo it creates a surge that can be unnerving while you are trying to use fine throttle control.

 

Thank you
So that's what that is... So fucking annoying.

 

@OVTune i will be in Harlan, KY March 7-13. I would be willing to roll through on Sunday the 10 and hang until the afternoon of the 12th before I have to head back to south Florida if you need a heavy MT on 4.88’s for some testing.

 

So, I'm going to assume the testing of 1.05 (patched) files is coming along well?

 

Does anyone know how OVtuned would do with the new TSB thst just came out for manual transmissions?

I have an appointment this week to have my blower motor recalls work complete and they said they’d re-flash for the new TSB as well. I want to buy OV tuned soon but am curious if it will just un-do that new TSB or if it works with it ?

 

It will completely replace the TSB flash, but if Mat doesn't have that data he may be interested in having you read it out and send it to him. Regardless IMHO the tune is going to be better than any TSB Toyota is going to give you.

 

if i were you i would get the TSB, then get your OV. you can go either way, but for some they find they are good with the TSB alone.

it also gave me a baseline to compare my experience stock and each phase of upgrading.