4WD Auto questions

[TheRaven]

So what you’re stating id that 60nm is whats required to overcome the clutch plate spring pressure, but then it doesn’t send any power to the front until a certain pressure point which could be around 220nm.

No. Based on the data we have, it appears that more than 220nm is needed to start sending torque to the front wheels. I never said anything about 60nm.

regardless, lets pretend all that is true…
In what application is this different in function to awd?

It really just seems to me like you are trying to justify it being this automatic on/off 4wd switch because of the name and awd being this different full time system.

I mean it’s not an on/off switch, it’s fully dynamic clutch based system. An awd system choosing to apply 10% power to other driveshaft is just how they tuned it, it’s not like the jeep could not do the same exact thing.

We've already been over this four times in this thread. Again - in an AWD system, all four wheels are getting some amount of torque all the time. In an "Auto 4WD" system, there are times when the non-primary drive axle gets zero torque. It's that simple. The technical difference is fairly small, but the effective difference is pretty big - with Auto 4WD, you have a 2WD vehicle until the system does its thing whereas with AWD, you never have a 2WD vehicle.

I've wasted enough space re-hashing this explanation, so i'm going to bow out now. Any other questions you have can be answered by re-reading this thread.

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[Bzinsky]

No. Based on the data we have, it appears that more than 220nm is needed to start sending torque to the front wheels. I never said anything about 60nm.

What? I said there is 6% clutch plate pressure, because we have data in this thread that is 60nm, which is 6% of the max of around 1000nm. You said that’s just to engage the clutch but does not provide any torque.

where you are getting this 220nm is required to send power to the front axle is beyond me and it makes absolutely zero sense

 

[Bzinsky]

No. Based on the data we have, it appears that more than 220nm is needed to start sending torque to the front wheels. I never said anything about 60nm.



We've already been over this four times in this thread. Again - in an AWD system, all four wheels are getting some amount of torque all the time. In an "Auto 4WD" system, there are times when the non-primary drive axle gets zero torque. It's that simple. The technical difference is fairly small, but the effective difference is pretty big - with Auto 4WD, you have a 2WD vehicle until the system does its thing whereas with AWD, you never have a 2WD vehicle.

you or anybody else in this thread has provided zero data or evidence to support this theory that says the clutch is just engaged but provides absolutely no power to the front. Meanwhile we have evidence that the transfer case is indeed pressurizing the clutch pack at all times when in 4 auto.

even in the slim chance you are correct, it still hardly absolves it from being labeled an awd system, and especially doesn’t mean it isn’t best to just explain it to people who aren’t aware of what it does.

Clutch based awd systems overheat, just like the wrangler system does. That’s why you shouldn’t go out mudding or doing endless donuts with 4auto engaged since we have a lockable transfer case (which btw isn’t really locked unless it’s at low speeds)

 

[JLfromCA]

If some members here would actually use their Jeep off road , instead of just reading the manual, they would understand how things work. Head up to the Rubicon Trail with your no lockers and your four-wheel-drive auto and see how far you make it. Big reality check.

 

[TheRaven]

you or anybody else in this thread has provided zero data or evidence to support this theory that says the clutch is just engaged but provides absolutely no power to the front. Meanwhile we have evidence that the transfer case is indeed pressurizing the clutch pack at all times when in 4 auto.

So basically what you are saying here is that it's your opinion that there is always torque being provided to the front wheels in "auto 4WD", correct? If so we hardly needed to waste all this space. Since you read the entire thread you know that this whole technical "deep dive" started from the question "is it a bad idea to just leave it in Auto 4WD all the time?" and regardless of if you are right or wrong, that answer remains the same - yes. It doesn't matter if there is zero torque or a small percentage of torque being pushed to the front wheels...either way, the clutch is in use and thus unnecessary wear is occurring.

So we can put this argument to bed because it's tangential anyway...ok?

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