6.2.3 One-way front diff
A one-way front diff contains two one-way bearings; one for each wheel. So it acts like a diff, but only in the forward direction: the front wheels can only rotate faster than the rears, but not slower. So off-power it acts much in the same way as a completely loose one-way pulley, but under power (accellerating out of corners), it makes the car a lot more stable, and provides more and more consistent front traction. this is because the inside front wheel can't 'unload'. Front traction stays extremely consistent, no matter how much power you apply to the front axle. Another difference is that there's no more front differential action off power, just freewheeling. So difference between a fully loosened center one-way and a one-way front diff is that with the one-way pulley, you'll still experience a little friction from the front diff when turning in. This can make chicanes and difficult tight turns a little more managable. But on the downside, you lose the sweet on-power feeling of a one-way diff. No pain, no gain.
So, with a one-way front diff, you get no front braking, no front differential action off power, high cornering speed, and excellent accelleration out of the corner. On really high-grip, open tracks with smooth, flowing high-speed corners, you need to use a one-way in order to be competitive.