Re: VTM-4 power transfer
I've seen that video before. It shows the CR-V with both front wheels with no traction - a totally different situation. I'm talking about the ability of a vehicle to transfer power from side-to-side through an open differential, not front-to-rear through a 4WD/AWD system.
Let me give another example: A modest 2003 Chevrolet Impala with traction control. This is a typical, front-wheel-drive design with an open differential. You're at a stop light. One front wheel is on a solid sheet of ice. The other front wheel is on wet pavement. You press the accelerator. Without traction control, the wheel on ice spins and the car doesn't move. With traction control, the system brakes the spinning wheel. Power is the transferred through the open differential to the wheel that is not on ice and the vehicle begins to move forward. Now, if the other wheel with more traction breaks loose and begins to spin, then system will then start cutting power. This is how traction control works. The only exception to this is an early GM design that limited wheel spin, but could not apply brakes and thus did nothing to get the vehicle moving if one wheel had no traction. GM still called this feature "traction control" although that was a very misleading term. This example of the Impala applies to every other vehicle with traction control. VSA/Stabilitrak/RSC/ESC/ESP or whatever another manufacturer calls it always includes traction control. It doesn't matter whether the vehicle is FWD, RWD, 2WD, 4WD, or AWD.
Another example: 2008 Infiniti G35. Rear-wheel drive, open differential. One wheel on drive pavement, one on wet grass. Floor the accelerator. Without traction control, you'll do nothing more than spray grass and dirt everywhere. With traction control, the brake gets applied to the wheel on grass sending power the wheel on pavement (functional feature designed to get you moving). That wheel will spin momentarily as the system begins reducing engine power to limit both wheels from spinning (safety feature designed to limit tire and differential damage), but the vehicle starts moving - being propelled primarily by the one rear wheel with traction.
Last edited by zroger73; 01-29-2013 at 11:09 AM.