Originally Posted by edyvw
Yeah, Mazda mechanically does not slaughters Audi. Also, Haldex is tuned in certain applications (MB) for 40:60% split with 20:80 and 80:20 max. torque split.
It is in category of Toyota, Honda etc.and ot is probably better. However, leave luxury class out of this. It is out of Mazda's league.
I'm curious how a Haldex would be able to push more than 50% of the torque to the rear, as 100% lock-up is a 50/50 torque split. To achieve this, you would need more than just the Haldex Gen 5 unit, but also other sub-systems. I am unaware of what other AWD components are under an Audi or MB that would allow this, which are also equipped with the Haldex unit. The Torsen units can indeed torque bias, but a clutch is a clutch, and all it can do is transfer 100% of the torque given to it, so unless the front is de-coupling, the rear is only seeing 50% of engine torque, and that, only in a 100% mechanically perfect world.
marketing speak/semantics are the only way you can get 100% or 80% or whatever torque to the rear, using only a Haldex. If the front wheels are on ice, and the rear's are on tarmac, yes, technically the torque is going to the rear...but the rear wheels are not capable of spinning faster than the front wheels, because the Haldex only locks the drivetrain. It cannot bias past full lock. There is no gearing component or decoupling of the FRONT drive, as I understand it, with Haldex.
This is an AWD dyno, and the vehicle being used is the Golf R, tuned with a HPA competition race controller, to allow the most aggressive torque transfer possible (the clutch pack is 100% locked). The turquoise line is the rear wheel power measurement. It is simply impossible to transfer more than 50% of total produced power to the rear, using a Haldex (or mazda, or any other clutch type system that won't de-couple the front drive wheels or use bias gearing) system.