A-trac in 4lo on all 2016 4x4 Models Non Trd Offroad

That is correct.

 

That's correct. 2WD is a little odd and it's because of AUTO LSD. Perhaps before ALSD it would have gone through the stages the same as in 4HI, who knows.

 

For real world testing. If anyone is interested, and lives near Hungry Valley. OR’s/Pros and the rest of the Tacoma Gang can have a get together. We can test side by side in different conditions. So many there. Loose stuff, steep stuff and so on. Plenty of room to get severely sideways too. That will give us time to observe on the sidelines so to speak watching the different models/modes take turns?

 

I think understanding the VSC-OFF and TRAC-OFF lights were really where it was all at. I think you have it correct, and possibly more elegantly than I have now. I am not happy with the addition of columns for throttle and braking for stability control... but

[Edit, latest data see https://www.tacomaworld.com/threads...non-trd-offroad.437814/page-22#post-16989593]

 

"4Hi TRAC OFF and VSC ON. In this mode TRAC is off from 0-30mph and on over 30mph."

TRAC is to get you moving when a wheel spins.. ie. from 0 mph. Why would it not be on until 30 mph, for what purpose? This is the point VSC comes on after being off from 0-30 mph in AUTO LSD MODE. I actually have not a clue as to why VSC is shut off at all in this mode (to 30 mph).
TRAC or TRAC OFF has no purpose once you are moving or lose momentum as they only kick in if you are stopped or begin to stop moving from a loss of traction.

 

You'd have to ask Toyota. I agree with what you say and it's not apparent to me why it turns off past 30mph but it does. My guess is that it's safety related but I do wonder what exact circumstances Toyota had in mind when they decided to turn TRAC back on over 30mph. In fact when you originally asked me to test this I would have bet good money that it would not turn back on past 30mph. I was surprised when it did.

Edit: On second thought here's a scenario. You are in 4HI TRAC OFF in snowy conditions going 45mph. You have it in that mode because you were struggling to get moving from a stop but later down the road you down shift and stomp on it to pass someone (stupid I know). If TRAC was still off at that point you would spin the tires and potentially get into a very serious accident. Perhaps Toyota thinks that there is no reason to NOT have TRAC on past 30mph unless you explicitly say I don't want any traction control at all (hold down the button and turn everything off).

 

I get what you are thinking there, but wouldn't that line of thinking need to hold true for 2wd- auto LSD?

 

I would be 'down' for testing at Hungry Valley. Let me know the date and time.

 

Well you aren't "TRACless" in ALSD mode like you are in 4Hi TRAC OFF. I think in their eyes ALSD is sufficient traction control for any speed and once you break 30mph they do turn VSC back on, just like they turn TRAC back on in 4Hi. I'm not sure why they turn VSC off under 30mph in AUTO LSD mode. Seems like they would have just left it on from a safety standpoint. Only thing I can think is that in some circumstances VSC interfered when trying to use ALSD so they went ahead and turned that off at low speeds.

 

The more i try to understand what really happens the less i actually understand.

 

Make sure you guys make a youtube video! lol

 

I'd love to join you guys, unfortunately I'm stuck out here in the midwest

 

Latest summary picture is in post 322. Want xls file? I will have to go get laptop out of car, be a few minutes.

 

Really... and a lot has to do with the mode called "TRAC OFF"! As you can read, we still are thinking TRAC is turned off, rather than TRAC having the engine regulation off for stronger traction control (if this is still true for 3rd gens). TRAC OFF is AUTO LSD in H2, afterall.

Could it be that an 'unnamed' traction control is present, and then there is TRAC which is regulated traction control? TRAC turned off (TRAC OFF) is changing to the unnamed traction control? Only VSC OFF is to turn off any traction controls (as it is for us 2nd gens)?

The problem with this is that some of you are posting in H4 TRAC OFF MODE that you have LESS traction control... ???

Please try the hill climbs, but not like the video... Don't do a running start for momentum. Let the 4WD do the job as far as it can... just drive slow and up the hill. Do it in the normal (TRAC) mode and mark how far you get. Then from the bottom, quick press for TRAC OFF and exactly the same light pedal for the climb. Finally, do VSC OFF MODE for no traction control and see how far you get.
Thank you!

 

I am available this weekend. Actually, I was going to haul my bike out to Hungry Valley and take advantage of the nice traction and low dust, after the week's rain.

 

Latest XLS file (one tab is summary, other has all dash light observations)

 

Dang, I was thinking of seeing if the following weekend would work, but if you’re heading out there this weekend, I can change plans. Anyone else care to join for the good of the team?

 

I just did some 4 Lo test runs on the farm roads behind my house. I got 3 pulls in before the farmers were on to me, I had to

I will try to duplicate tomorrow morning to recheck.

Let me tell you this thing pulls like a bat out hell at 40mph and 6000rpm with ECT on and OV tunes 91 a shift


My findings are as follows, when switched in to 4Lo:

SR/SR5/TRD Sport/Limited
7. 4Lo TRAC ON and VSC OFF
8. 4Lo TRAC ON and VSC OFF Short push does nothing.
9. 4Lo TRAC OFF and VSC OFF In this mode TRAC is OFF from 0-41mph, I had to shut it down due to power polls and strawberry fields.

 

I really feel like this supposed 4HI TRAC OFF mode that provides strong LSD and no engine regulation is non-existent. I'll go so far as to say even on 2nd gens. Toyota makes absolutely no mention of it any where. I think if it did exist it would be called ALSD in 4HI because that's exactly what the proposed mode is. But that's not a mode. Toyota explicitly states in the manual that ALSD is 2Hi only. I may go do some testing to definitively determine it for myself but this just doesn't make any sense to me. Why would you get increased traction control by going from TRAC ON to TRAC OFF. If the exact opposite is true I do not think Toyota would have left that labeled as is. The confusion may lie in the real world testing, at least for the 2nd gens. It wouldn't surprise me one bit if while offroading people have better success in 4Hi TRAC OFF in certain circumstances. Toyota even explicitly says it may be necessary to turn TRAC off for certain situations (in particular when cutting engine power is detrimental). I think some may have confused that success with LSD like functionality when in reality is was simply the disappearance of engine regulation that allowed them to better traverse obstacles.

Really the test that proves this mode doesn't exist on 3rd gens has already been done. Jacking 1F 1R in the air putting it in 4HI TRAC OFF and going. If there was any LSD functionality in that mode it would have kicked in, but it didn't according to the guys who did just this.

 

I tested in 2WD ALSD on at a freeway onramp when it rained here not too long ago. Slippery conditions, I floored it (safe conditions, no one was around and it was a long on ramp with plenty of side room) Slightly going up hill. The Taco got sideways big time ala John Force doing a long burnout until I backed off of the gas pedal. VSC never kicked in.