Tacoma - OVTUNE - VFTUNER - Update Info and Original Development

How does an OV tuned 3rd gen compare to the previous gen 4.0 motor in stock form (meaning no lift and stock tires). My Mom's got a 13' Taco with the 4.0 and her truck is noticeably more powerful.

 

Happens to mine also .. 17 Texas

 

Engine braking is almost nonexistent in D on 1.03... compared to stock. Which has its pluses and minuses - good on the highway when you want to just coast without throttle, hotter on the brakes when driving in slow moving traffic. You adapt but somewhere between the stock pseudo engine braking and nonexistent would be the sweet spot

 

2016 tacoma sport 04B03 and it never did it with 102 shift a or c so it's something that was changed in 1.03. I'm sure matt will figure it out, just want to give info on what's happening. Sucks cause matt has this truck so close to being perfect for me. Just the touchy throttle from the takeoff and coming out of the corner and the truck saying "what do you want me to do"

 

You mean, “feels more powerful” the 3rd gens have more HP and torque

 

IRT all the engine braking talk, wouldn’t having a tune that eliminated the Atkinson cycle (full OTTO cycle with no decrease in effective compression ratio) increase engine braking at low loads and low rpm? A tune that didn’t allow Atkinson seems like it would be great for towing and off-road, especially for the MT crowd.

 

Ok, I can go with "FEELS". So how do they compare? Does the OV tune make the 3.5 feel more comparable to the 4.0?

 

Now V1.04 I'm down for. Order #2968

 

That theory was definitely talked about along with altering DFCO over in the M/T thread.

 

I’d like to see an updated dyno sheet with the release. Curious if these issues have required him to tune it back a bit.

 

Hmm well he did tease us with that pic of his pro on the dyno...

Would that be a show stopper for you to purchase?

 

I *BELIEVE* OV said it was eliminated in gears 4-6 as that is what early adopters wanted. It is unclear wether

Thanks! "Non-existent" while in D - ALL gears? I agree about the +- you mention if that is the way it acts. I'd add that for towing and some types of off-road, no engine braking is not good at all.

 

I don’t have many of the issues others do. It’s a manual so none of the automatic issues apply. I have two complaints about the truck: one it struggles to keep pace on any kind of hill and two the rev hang/shifting can be terrible. Many people have reported that it accelerates much easier in 5th an 6th which is what got me to buy in. Some of your recent reports suggest this is no longer the case with the test file. So long story short, if it no longer improves in that area it may be a deal breaker.

Being it was on the dyno I would be a little sketched out if that info isn’t shared. (Would be nice to get a manual on the dyno as well, hell if others chipped in I’d be more than willing to do an independent before an after)

 

Well, as you are most likely aware 1.03B/C don't cause issues on all trucks. The rub there is of course, you won't know until you buy in and try those files yourself. I can understand why you wouldn't want to take that risk, and then have to run a file with reduced power to avoid other problems such as stutters and/or throttle tip in issues.
To be clear about my comments on the T2 91 Octane file - another member running the file on a different ECU has reported the same thing - reduced power compared to 1.03B/C (that symptom was captured and the log file was sent to Mat BTW). Best to wait on our reports of the official release and/or new dyno results if you want to be sure.

Edit: AFAIK, rev hang has not been directly dealt with yet. What I mean by that is Mat has never mentioned it in any of his M/T updates as an issue he's altered/fixed. There was only one post a long while ago where he showed us a map and made a brief reference. Some have said they feel like rev hang has been "reduced" but that's not the case on my truck.

We'll know soon enough.

 

if i could get away to SoCal i'd do it myself in a heartbeat.

after reading what you say i have a question, since you mention 'dealbreaker'. are you looking for a perfect, 100% factory style fully developed tune? as in how it would look if Mat himself has full access to all the Toyota internals? i ask because it's something like 90-95% there. the last bits could take forever to reverse engineer if it's even in the cards.

i ask because if i had the choice between a 90% complete OV tune with some slight side effects vs. the factory stock tune, I'll do OV for $800. the factory tune was utter misery, and i can't justify sitting in the truck with that shit. ever. but I'm just curious what you're actually wanting. i know you have experience with tuning, so I'm kinda confused.

 

I know it will never be perfect (perfect for everyone), kind of like I said earlier I don’t have many issues with the stock tune except for a lack in power in 5th and 6th on the highway (and the rev hang). My concern honestly is paying money, hoping to get that upgraded power in 5th and 6th but then realize it’s not achievable without having other issues such as stutters happen (I either don’t have or notice stutters stock). I commend Matt for taking this on and there is definitely a lot of positivity that has come from it, not trying to take anything away from the guy.

I’d just like to see the updated dyno (no reason a new one shouldn’t be shared) and once people get the updated tune, see if that original power in 5th and 6th are still there.

 

All I can say is if the power is back in the new file or you can run 1.03B/C without issues, you will definitely like the added power with the 91 Octane tune. Highway cruising is just effortless, and once your'e up around 2500 in 6th the thing starts to gooo. It was unfortunate for me that the stutters plagued my rig on those files.
I'm running stock gears/rubber BTW.

 

Has to do with the atkin cycle because theres no negative pressure its being pushed out by the valve hanging open longer.

 

1.04 development Dyno use wasn't to find more power. It was to further test shifting, torque maps and improve throttle control. Power was not lost.

For example MT versions B and C. No difference in WOT power, just throttle changes that change how the engine responds per accelerator angle.

So, since 1.04 was not in search of new power I Wasn't doing full power runs. Sorry if this is a deal breaker.

 

yeah it's different for everyone. i have no complaints on highway power for certain. that's where it all shines for me now. but i get what you're saying. i didn't buy the tune to address highway power, so the add is a huge bonus for me. i got it for driveability in all driving up to highway speed and that's where the value started for me, so it's a different case for us. i see.