Quote:
|
Originally Posted by MadMax
my take on what's going on on an attempted patch laying....
I take off hard, a wheel spins since it's an open differential before the computer kicks in, then the braking differential kicks in reducing power to the spinning wheel (NOT shifting power to the wheel that isnt spinning like a mechanical limited slip unit would); the final result: tire stops spinning because of braking force exerted on spinning wheel
|
i will concede, i think we are both misinformed. Orange Crush just put up an excellent post about the computer systems in our truck:
Nissan Titan 4wd System Explained
taking an excerpt from the post about ABLS:
"ABLS, applies brakes selectively to a slipping wheel. This braking action literally fools the differentials into sending power everywhere except the slipping wheel."
"When ABS wheel-speed sensors detect a loss of traction in one or more wheels, braking force is applied to that wheel to help slow it down. This redirects power to the wheels with better traction."
based on the above (and comparing to my prevoius experience driving mazda rx-7s with and without a cluth-type LSD), it seems ABLS does act like a true mechanical LSD. if a spinning wheel is locked up with the brake, the torque has to go somewhere, i.e the other wheel. i dont know how much torque is lost though from this action, though. need to do a FBD (free body diagram) to figure that one out.
you are right in saying that there is a rev limiter associated with the ABLS, although this is a separate traction control system. still, if i'm accelerating from a dead stop, i can break BOTH tires loose (i have semi-drifted this truck around a corner) in both straight accelerations and around a corner. they keep spinning until the TCS kicks in, which i slightly notice as a pause in power.