Artical on Torsen front Dif

[M1919A2]

Follow-up question

With the 4Hi or 4Lo engaged, does not power go to both front wheels through the LSD when there is NO slippage of either wheel? If this is the case, and I don't know thus this question, why the need for a braking of the brakes cause the slipping wheel to receive power via the LSD? An explanation would be much appreciated. Thanks in advance.

 

[Squatting Dog]

With the 4Hi or 4Lo engaged, does not power go to both front wheels through the LSD when there is NO slippage of either wheel? If this is the case, and I don't know thus this question, why the need for a braking of the brakes cause the slipping wheel to receive power via the LSD? An explanation would be much appreciated. Thanks in advance.

It is more about one of the front tires being in the air spinning.. The torsen front diff uses torque multiplication between front wheels. So if one wheel is in the air spinning, the other is left with no power. If brakes, or traction control stops the tire in the air from spinning the other tire receives power..

-Greg

 

[M1919A2]

It is more about one of the front tires being in the air spinning.. The torsen front diff uses torque multiplication between front wheels. So if one wheel is in the air spinning, the other is left with no power. If brakes, or traction control stops the tire in the air from spinning the other tire receives power..

-Greg

So it's about one of the wheels spinning. As long as there is SOME traction, even intermittent, to both wheels the LSD distributes torque to both (such as on loose gravel/rocks or snow/slush/mud. Is that correct?

 

[Squatting Dog]

The Torsen differential is simply a torque multiplier (raptor is 2.5:1, I believe) that works through the use of friction generated by thrust forces from the internal gearing. It multiplies what torque is available from the wheel that is starting to spin-up or lose traction and sends that available torque, multiplied by the TBR, to the slower turning wheel with the better traction.

What happens when I have a wheel in the air?

As mentioned above, the Torsen differential is a torque multiplier. The Torsen requires some type of resistance or friction in the system to function properly. A wheel in the air provides zero torque or friction on the system and as the Torsen multiplies the available torque, zero, by its TBR, the end result is still zero.

Old school guys use to drag the brake to transfer the torque. The Raptor and its computers automatically apply the brake to spinning wheel and transfer torque..

-Greg

 

[M1919A2]

Thank you. That explains it very clearly.

 

[Squatting Dog]

Thank you. That explains it very clearly.

You are welcome... That is why the mudrats and crawlers are excited about 2012 Raptor.. It is now more than just a desert truck.

-Greg

 

[BigJ]

... The 2012+ Raptor and its computers automatically apply the brake to spinning wheel and transfer torque..

-Greg

Greg, just to be 100% clear... my edit above is correct? Those of us who retrofit will have to work the brakes, right?

 

[Squatting Dog]

Greg, just to be 100% clear... my edit above is correct? Those of us who retrofit will have to work the brakes, right?

Yes, good catch BigJ! Prior to 2012 the traction control would just cut the power..

-Greg

 

[Chrisandalex1]

has anyone done the retrofit yet?

 

[surfer]

GOOD to know