vF Tuner for the 3.5L Tacoma-AGM tuning

Ah yeah that's what I meant, I have the numbers reversed. It was around 14.5v at 30F and dropped to 14vish during the day here when it was warm. I need to actually start writing down the ECT vs the voltage, my brain doesn't work anymore haha.

 

I have to lower mine a bit, but using 96, 96, 96 resulted in 14.8V recorded by OBD Fusion App

Ambient was 65* F this morning and when I got to work (15 Min) I was only down to 14.6 / 14.7 with Coolant Temp at 199*F and IAT at 88*F

I've unfortunately missed Summer here in Alabama, but will continue to log temps and voltages if I get a warm day here. I'm going to drop the lower temp numbers to 95.5 or 95 to get that initial voltage to 14.7V


This is on a 2020 Tacoma and a Group 31 Odyssey ADM.


Best,


John

 

I was able to flash a few changes at lunch and have some information.

65496 (-76f) 65506 (-22f) 0 (32f) 30 (86f) 60 (140f) 90 (194f) 120 (248f) 150 (302f) 168 (334f)

Stock 91.843 91.843 91.523 90.242 88.96 87.679 87.039 86.398 86.398 = 13.8 v Resultant (At Driving Speed)

Change #1 96 96 96 95 92.5 90.5 88.5 87.5 87.5 = 14.8 v Resultant (At Driving Speed)

Change # 2 95 95 95 95 92 90.5 88.5 87.5 87.5 = 14.7V Resultant (At Driving Speed)


I was able to see the charge voltage drop from 14.7V to 14.6 when coolant temps finally reached 188*F to 190*F

Charging Voltage then dropped to 14.4V - 14.5V when the ECT was reading 199*F - 202*F / IAT's remained 88*F - 92*F


My initial logic would have called for IAT to determine battery temperature within the engine compartment, but looks like the ECT (Which is listed as the factor in VfT) is the variable. More testing is needed....




A few items of clarification on the thread IMHO:

• Charge Voltage needs to decrease as temperature increases. I haven't found any AGM literature that shows otherwise.

• I had a National Luna Dual Battery kit in my 80 Series and it would disconnect the 2nd battery when my IAT's hit 180*F (Sitting in summer traffic) - I talked with NL AUS and they stated this is a safety feature to not destroy a battery when it over temps. I would recommend that you follow the stock Toyota map of decreasing charging voltage as temperature increases. I would not do a flat value across the entire temperature threshold.

• Lastly I do not believe that the temperature sensor is the Ambient Air Sensor. The testing today shows otherwise, but I'm still looking for a list of all sensors in the Tacoma that can measure temperature.. They might have snuck something in there, but I'm not sure..

Hope this might help someone~


Cheers,

john

 

@OVTune
There are many theories in this thread.

Are the axis values for ECT Fahrenheit or Celsius?

Are the axis numbers for ECT:
Engine Coolant Temperature?
Engine Compartment Temperature?
Ambient Air Temperature?
Something Else?

Is the developer still going to fix the Negative Values?
Or can you confirm what the values should be (-40 & -30 or *** & ***)?
Maybe a negative number will not work properly. I am ok with 65496 and 65506.

 

Thank you for this..

 

ECT is engine coolant temp

Values will always be in Celsius.

Yes we will get neg values fixed.
Furthers value is -40.

 

Thank you.

 

I have not contributed to this thread. I have made and monitored many changes trying to verify the different theories. I have not come up with anything conclusive, so I have not shared. Now that Mat has chimed in, I am going to make some axis changes and see if I can get something to make things more clear. Most of us have come up with a method to increase our alternator output. I am one of those that would like the voltage to drop some when things warm up.

 

Mine drops from 14.7 on initial start to 14.5 / 14.6 when fully warmed up. Note that until I see summer temps and some engine compartment heat soak, I probably won't see less than that during driving and a battery that needs to take some charge.

After the truck running around for an hour tonight I did see 14.3 but that also had IAT at 89* and ECT at 199* so this is showing the alternator decreasing voltage as the battery is reaching a point where it does not need more.. Not decreasing from an increase in ECT / IAT or both.

I'm happy Mat made this available as even though I have the truck on a Ctek AGM charger every night, the constant short trips to work and back at 13.8V was slowly decreasing capacity as I was easily seeing 12.6V resting voltage. Today after coming out of work I was at 12.8V so thats showing that the updated settings are working for my battery. YMMV

Best,

John

 

Hey guys
hope everyone had a great and safe thanks giving.

AGM / Battery tuning is probably one of the biggest / most common requests we get, and we want to have a central resource for settings/ batteries, etc.

How could I convince some of you guys to post your information about tuning your battery on our forum? forum.vftuner.com

It would be great if we could create a thread with battery type, settings used, voltage achieved, etc

 

Or you could just post a link in your forum to this thread?

just a thought

 

https://forum.vftuner.com/

 

Lol I meant the other way around. Since there’s a lot of info here to have a link in the VFtuner forum pointing to the TW thread ha.

Good stuff all around

 

Post your ECU and Settings Please for all to to use!

 

Getting started with some tuning in vF. My first attempt is the AGM adjustment. Looking like people are dialing it in to adjust with temps. Kudos to the genius’!

can I get a quick quality control check before I flash? since I’m brand spanking new to vF? Do these values look right for a 17? I’m running a northstar, so charging voltage should be 14.4-14.8 at 77 deg F.

Do I need to adjust any other tables?



thank you @Boltripper for your work!

 

What ECU is it 04b04? 30 and up i have set at 94

 

yes, B04. What voltage are you seeing at idle and at rev, and at what ECTemps?

 

You also want to change the Phase duty2 base voltage 13.6 up to 102.398 and up Phase duty base voltage 13.6 to 102.398
I get a max 14.5 and a low of 14.3 works great for my northstar 31

 

Ok.

The float charge is supposed to be between 13.5 and 13.8. My understanding is that is supposed to be what the battery receives at idle, and then the voltage goes up to the cycle service of 14.4 - 14.8 when RPM's go up. Does that sound right to everyone else?

 

I'm trying to consolidate information and maybe make it more useable (at least to me). I put together this google sheet with the 04A61 stock and @mZiggy AGM settings. Maybe it's a useful repository for all the different confirmed settings for the different ECU's? Not sure if the stock settings are useful or not and if they are all the same between MT and AT. I'm guessing they are but I'm not 100% sure on that. The sheet is editable, so hopefully it doesn't get messed up. I'll try to make backups if people are using it so not all is lost if someone messes up. Feel free to edit and add to it!

https://docs.google.com/spreadsheets/d/1fMjzUojKWOj_kI3BmHQ7TFgJiR3k4SztWwjS3NCojuQ/edit?usp=sharing