vF Tuner for the 3.5L Tacoma

The ECT shifting maps have been modified to not downshift, regardless of pedal input, unless at minimum speed for that gear. So once you have ECT on its not going to downshift unless you slow down. You have to put it in S to manually pick your gear but its still limited to the gears you can be in so it wont damage anything.

On another note, If anyone is trying to fine tune the slip locking. It only works in one direction. Meaning you can go from full unlock to slip lock to full lock, but you cannot go in the other direction, full lock to slip lock to full unlock. I don't see the point of slip lock since its essentially only used under 10% throttle on the stock maps so I'll be getting rid of it on my tune.

EDIT: For further reference, on the stock maps 10% pedal was basically never used because the accelerator maps were so numb.

 

Thanks to the guys discussing transmission clunk during decel a few pages back. Finally got that cat skinned.

Edited because apparently I accidentally gave myself a placebo pill

 

share a screenshot of what you are talking about for some of us less inclined please

 

I spend most of my time on here on my phone. Will try to remember to do this next time I fire up my tuning laptop. OVTune posted a tutorial on this somewhere back in the dreck behind us.

 

https://www.tacomaworld.com/threads/vf-tuner-for-the-3-5l-tacoma.662948/page-271#post-24256395

 

The maps are airload control - control airflow and airload control - expected airflow. Here is what the stock maps look like:



Those dips / humps cause a drop in airflow around 1200-1600 rpm. Making the maps look smoother by using the ctrl+I interpolate function helps with this. Supposedly. Because I just opened up my file and apparently I did not save my work, which means it did not flash to my truck. So I guess I got placebo'd . Anyways the rest of my tune is running nice, lol.

 

That's not the one, there was an earlier post if I remember correctly.

 

https://www.tacomaworld.com/threads/vf-tuner-for-the-3-5l-tacoma.662948/page-206#post-24143210

 

I'm tying to get tc unlock in 5th while going uphill. All tunes are getting stuck in locked and sucking the available power to get to the top, causing kick down to 4th and ACIS activation. I'm hoping to unlock TC at conditions below to get a small acceleration. Here are the parameters:
-speed 75-78 mph
-engine load 90-95%
-accelerator 40-45%
I'm looking at unlocking tables for 5th gear 1-4


and tables 5-6.


I'm thinking to lower numbers in 5-6 tables for 32 and 42 accelerator. It seems TC should be unlocked if looking at tables 1-4. Did anybody play with these 2 tables? Is it safe to unlock at 90% of the load?

Thanks.

 

I'm nearly positive tables 5+6 are for trans warm up only. Then it uses one or all of the first 4. I've changed the first 4 to all be the same and have raised the values. This certainly seems to be the case. As far as unlocking at 90% load. Isn't that what it does to downshift?

 

TC and shift maps don't care about load, they shift / lock / unlock based on gas pedal position.

 

Short of eliminating TC locking in 1-3, I haven't played much with the TC values, but If I understand correctly, the unlock would only happen at speed less than the value in the unlock tables. If that is the case, the TC will not unlock until you are below 56 @ 20 degrees, or 64 @ 26 or greater. Perhaps modify one of the 100 values to be 50 degrees or so and set it and the 26 degree value higher working through the tables until you find the one that controls what you are looking for.

 

Yeah, the TC is the honey badger of the automotive industry.

 

Lower the values to make the torque converter unlock more. I agree with you @Mooseditty17 5-6 is for warm up.

 

Thanks. Just sent email to @OVTune via zendesk.

 

It occurred to me the these maps look sort of like the inverse of one another.
i.e. where one has a peak, the other has a trough.
Maybe they are used together and means the output is 'smooth'.

I didn't notice any difference after changing them. It certainly didn't give 100% throttle; which, I'm still not convinced would make a difference... I compared a few 1st and 2nd gear full pedal logs where the throttle was and wasn't 100% at various rpm... the airflow was nearly identical. The throttle appears to give the engine as much air as it can take, except...

Where the throttle is apparently limiting airflow (briefly) is just after the initial stab of the pedal... it opens, closes some, then opens again... it only appears to limit the airflow for ~150 milliseconds; so, it's not like removing that is going to significantly improve everyday performance.

 

Yes as inksin posted, OVTune has said they are the inverse of each other. But, we are still in the dark as to exactly how the ECU uses them to calculate throttle.

I think it makes sense that the ECU doesn't give full throttle at low rpm. My testing is showing I can get 100% load at low rpm, which if I understand load correctly, means the engine is already flowing the max capacity of air that it can at that rpm. Opening the throttle further would not get you anything.

The other thing I have noticed just as you stab the pedal, is that in a lot of scenarios the intake valve immediately retards (further into atkinson), then you need to stab the pedal further to get more throttle, advance the timing, and sometimes a downshift. I have a tune ready to go with advanced intake valve timing which I am hoping will fix this; but I'm not sure I want to flash my truck given my limited knowledge of tuning timing.



The hole in the map at < 50 load and < 2400 rpm is what I want to address. I am considering making all values at least 18.559.

 

Do it do it do it do it

 

I'm only going to talk about the tables for the 1-4 maps but I'd also like to see your TC lock tables because just looking at this, your map is setup so that IF it locks and you're driving about roughly 57 MPH or higher it will NEVER unlock no matter how much pedal you give it. But this is where the TC lock map needs to come in and I need to see what you've set that up as to find out whats wrong.