vF Tuner for the 3.5L Tacoma-AGM tuning

Mine is set to 94 from 30 and up.

change them all to 95 and check the voltage. If that’s not enough change to 96.

 

Does anyone have a photo of the stock mappings?

 

Not right this moment but you can pull any of the shared tunes that dont have the AGM settings applied and those should be stock maps.

 

I see. It looks like some people are just setting 1 value from 30 and up without compensating for temperature.
Could overheat the cells inside the battery.
The stock map looks to taper down the voltage the higher the temperature gets.
Ill continue to watch the thread until an actual engineer or trained technician chimes in. Dont want to load random values and cause heat problems.

 

04A61 (Stock)


04B14 (Stock)

 

Below are pics of my volts at different temps (ECT). Also while driving they would stabilize to 14.7v to 14.8v. I have not verified at the battery yet. I have not made any adjustments.

If I need to adjust the volts up or down a bit, what would I change?

Then what would I change to bring the volts down when the Engine Coolant Temperature (ECT) rises.











@mZiggy @banjoist13 @Shellshock

 

Change the base phase duty values up or down. Exactly which phase they correspond to, we don’t exactly know. I’d either set them all the same or bump them up all by the same amount to keep the factory curve

 

The base phase duty axis numbers are confusing.
If they are °F they kind of make more sense.
If they are °C they are even more confusing.
The 65496 & 65506 = WTF.
If the values are °C.
Then °F would be.
65496=WTF?
65506=WTF?
0=32F
30=86F
60=140F
90=194F
120=248F
150=302F
168=334F


@OVTune

 

Thats why i made all mine the same number lol ill adjust once we actually know what it means. In the mean time my voltage stays consistent.

 

The 65496 is most likely a computer-related value.

It probably represents a value with max size of 2 bytes.
1 byte = 8 bits thus 2^16 = 65536.

Edit: looking at the screenies, its probably some sort of placeholder.
Edit2: or can be used as some sort of bias value to compare against. they probably put some logic in there to do that. its like storing a variable for later use.

 

Just flashed Banjo's values on my 4B04... will test more tomorrow, but initial numbers on warmed up engine are 14.3v idle. Northstar FAQ says 14.1v - 14.8v are acceptable for charging the batteries. I know the label says 14.3v or so, though.

 

The only thing that makes sense to me for those values are that they are 16 bit unsigned integers. If that is the case 65506 would equal -30 if converted to signed a integer and 65496 would equal -40. So it would seem the temperature range for charging voltage would be -40 to 168. If it's in ferinheight or Celsius who knows. But that range In Deg F looks to make sense.

 

Yep, there you go. Thanks for the assist. Makes a lot of sense.

 

It would have to be in C. Doesn't make sense for it to be in F.

Can anyone find a data sheet on AGM batteries that list charge voltages desired for ambient temps? I just sent an enquiry to Northstar (since that's what I have) to see if they have tables already for their automotive batteries.

 

If you get the data from Northstar please share. I was looking for that also.

 

I'm running 2x Oddesy g35's (pc1400's) - i don't remember my settings but the voltage is almost constantly 14.7v. FWIW, it's been 95+ here in KY all summer and i never had any issues. However, i like the idea of things spooling down when temps get hot.
You can find my AGM settings way back in a VF thread somewhere

Edit: that's 14.7v at the terminals on my multimeter

 

Found some info for Northstar automotive AGM battries

 

I got a quick answer from Northstar. Pretty much tells us what we need to know for Northstar batteries at least:

Assuming ideal charge voltage of 14.5v @ 25C that puts the table at:

Code:

Temp (C) Voltage
-40 15.67v
-30 15.49v
0 14.95v
30 14.41v
60 13.87v
90 13.33v
120 12.79v
150 12.25v
168 11.926v

 

I still am unsure about the base duty header being in degrees C. At 168C(334F) that battery would cook, properly start melting the plastic. Even if it's using engine coolant twmp 168C is outside of any use.