Tacoma - OVTUNE - VFTUNER - Update Info and Original Development

No no. But atom splitting doesn't require Microsoft OR Macs!

 

@OVTune Mat, One thing I would look at that I have noticed that will cause the never ending shift cycle between say 4th and 5th or 3rd and 4th on hills. The truck will upshift to say 4th, stabilize and then the torque converter will lock (small drop in RPM). After the torque converter locks the truck can not maintain the speed so instead of unlocking the converter first and more than likely being able to maintain the speed it will down shift and easily recover the to the speed and then upshift and then torque converter lock and repeats. Not sure what the TC lock map looks like but would think it would be looking at throttle position as one input. One could then adjust this value so it would unlock when the throttle position is increased. I sent this in an email also.

 

This is 1,000% why I would LOVE to have the ability to lock the transmission into a gear for highway cruising. Could just lock it into 5th gear and go. On a slight incline, it doesn't need to downshift a gear and then stick in 4th running at 3000 RPMs for the next 2 miles.

 

The problem with that maybe the truck can not maintain the desired speed in that gear with the TC locked and would bog or you could be right if locked in the gear the TC would unlock. The TC needs to unlock so the engine can spin up a little to make more power. The TC should unlock prior to the down shift or I think it should anyway.

 

Yes, gear lock would be the best!

 

Is this not the same as flicking the shifter over to S mode and selecting a gear to hold? Can this be done on CC Or even not on CC and does it still shift on its own at a certain rpm? I'm new to Tacoma and learning.

So far I think my truck is pretty damn smooth but I have noticed the CC downshift with any highway hill..

 

S mode just limits the truck to the selected gear as the highest, it'll still start in 1st, shift to 2nd etc, but won't go over what you've selected. I have no clue why they bothered with it, it doesn't even let you set off in 2nd like every other automatic transmissions ever.

 

Well I'm in Afghanistan, so as soon as they either let us kill Taliban or they quit shooting at us I can go home lol!

I'm stationed 7 hrs north of him but plan on making a trip down to the area, I'd be willing to drop the truck, or trade vehicles, etc so he could have it for a few days.

 

I'm working now to make the map changes to stop it from bouncing back and forth between 5th and 6th at highway speed.

from what I understand or am reading.... people don't want to the truck to go into 6th gear at 60-65mph


for people who emailed about 87 / 1.01B / etc you'll have it today

 

FYI the truck goes into 6th at 72mph in ECT mode

 

thanks. We can change this now too.
Testing now to see if we can make D mode shifting = ECT mode shifting params

 

There's no way you'll please everyone here some want it to rev out and fly up hills others want to to granny out and get mpgs. I think the biggest issue (in a MT driver but have been reading all the AT complaints) is the truck is in SUCH a hurry to get to 6th for mpgs that it bogs itself down, even in a hill when it shouldn't, then panicks and downshifts to make up for the lag and loss of power and and speed, then just as it gets up to speed and comfortable level again it shifts and looses it's power. Rinse, repeat. I think if you could make this trans act like it should a respond to load and speed variables etc and stop of from constantly trying to change it's mind people will be more happy. My bronco had 4 gears /OD. That transmission was incredible in how it performed. If I double tapped the gas it dropped gears if I was steady and not on a lot of load it went into OD. Up a hill? Drop a gear and go, it didn't do that cyclic freak outs that Toyota has this truck doing.

Perhaps the 5.8L power helped, not sure the limitations of the 3rd gens or not... You sir are in a world completely unexplored and it looks like a mess, and you're the only one who can fix it lol.

 

The truck will go into 6th gear at 35-40 mph. The issue is in "D" the truck wants to move as fast as it can to 6th gear to try to save on fuel. What I'm trying to say is that its just not a 6th gear problem as even 5th at 35-40 mph makes the truck feel like a slug.

A good first step would be to take the ECT maps and make then the "D" map.....you'll make 75% of the people here happy with that alone

 

This is pretty much the issue, but going the opposite way is an issue too.

I find ECT holds on too much when you're trying to drive around normally, it'll stay in 4th until 52mph which is about 2400rpm.. which means the engine is noisy and feels like it's crying out for a gear change. Using ECT when towing works wonders though.

It needs to be load based, if my throttle input is enough that I'm clearly trying to get to 50mph, don't change to 5th/6th until I release that load(heh). The issue now is that we're trying to get to a decent speed at a relaxed acceleration but it's deciding that we need to be in 5th/6th at 35mph then we give it more throttle to get it to change down and actually continue accelerating to the speed we want.

Very difficult to get over via text lol.

 

this will be a huge step in the right direction and by you time to refine the transmission without being bombarded with the constant "tune is good but the tranny still feels sluggish" comments !

 

Just for the record Mat, I'm not one of those people. I'm not picky about holding 5th gear.

What I emailed you about a week or so ago was how at moderate-light throttle, it locks up torque converter and falls flat on it's face around 27mph and just upshifts. The 0 to 27mph is perfect with 1.02b tune, great pick up, then just bogs there afterwards.

 

same shit happened to me. had to re DL and unpack.

 

THIS!!!

 

Good news, better news:

Confirmed testing on these maps. We're dissecting shift log data now.

We can change shifting for D mode and ECT mode.

We can make each gear, in each mode, shift however we want, at whatever RPM peak we want

Now begins dialing each gear.


We're going to need some forum member feedback. As I understand different people want the truck to react differently. We may offer 3 different shift settings.

 

I REALLY feel like you should drive one of these auto trans Tacomas for a few days and you'll be very annoyed with it shooting up through the gears into 6th at like 35 mph or whatever it is. Its great if you drive like a 90 yr old lady, but not for those of us who enjoy the go pedal.