Help me understand atrac, center diff lock, etc

[Gecko123]

Hello

I have a few of questions...

1. Is A-TRAC available when driving under normal conditions (differential not locked). I know it doesnt kick in until a wheel starts to slip.

2. I have 2006 4runner so it has center differential lock so does that mean when the diff is locked the front and rear wheel apply the same amount of torque?

3. What is the difference between TRAC and ATRACT


Thanks

 

[BlackWorksInc]

Hello

I have a few of questions...

1. Is A-TRAC available when driving under normal conditions (differential not locked). I know it doesnt kick in until a wheel starts to slip.

2. I have 2006 4runner so it has center differential lock so does that mean when the diff is locked the front and rear wheel apply the same amount of torque?

3. What is the difference between TRAC and ATRACT


Thanks

-A-TRAC is available when in 4Lo, CDL (Central Differential Locked) That's if you consider A-TRAC as a separate entity, Toyota gets vague about this as the model years progressed.

-When the Central Differential is Locked, the transfer cases forces a 50/50 split of engine torque to the front and rear differentials themselves, from there the differentials are open and they will manage power like normal open differentials (without assistance from VSC/TRAC/A-TRAC)

-A-TRAC is a more aggressive form of TRAC, designed to engage under stricter thresholds and act as an LSD for the differentials. Again this is a nomenclature thing, A-TRAC is really TRAC with more aggressive parameters so they aren't really different form each other...

If you reference the .PDFs I posted in this thread http://www.toyota-4runner.org/4th-gen-t4rs/131835-traction-control-off.html They give a good description of each system's function and usage.

This thread also goes into depth about A-TRAC & TRAC and how its kind of semantics... http://www.toyota-4runner.org/4th-gen-t4rs/123332-does-atrac-abs-work-reverse.html

I hope that helps.

 

[Gecko123]

-A-TRAC is available when in 4Lo, CDL (Central Differential Locked) That's if you consider A-TRAC as a separate entity, Toyota gets vague about this as the model years progressed.

-When the Central Differential is Locked, the transfer cases forces a 50/50 split of engine torque to the front and rear differentials themselves, from there the differentials are open and they will manage power like normal open differentials (without assistance from VSC/TRAC/A-TRAC)

-A-TRAC is a more aggressive form of TRAC, designed to engage under stricter thresholds and act as an LSD for the differentials. Again this is a nomenclature thing, A-TRAC is really TRAC with more aggressive parameters so they aren't really different form each other...

If you reference the .PDFs I posted in this thread http://www.toyota-4runner.org/4th-gen-t4rs/131835-traction-control-off.html They give a good description of each system's function and usage.

This thread also goes into depth about A-TRAC & TRAC and how its kind of semantics... http://www.toyota-4runner.org/4th-gen-t4rs/123332-does-atrac-abs-work-reverse.html

I hope that helps.

Thank you very much

 

[Gecko123]

Atrac

Toyota Active Traction Control (A-TRC) - YouTube


Interesting video