I still think its the coolest car
Originally Posted by imageWIS
It's not possible to sell that car as an everyday car. It utilizes an anti-lag mechanism, which keeps the turbo boost always on, and while it works well and has an awesome sound when it kicks on, it severely degrades the turbo blades and usually runs the engine much harder than normal. This is fine on Rally cars, which oftentimes get their turbo blades replaced every couple of races, but on an everyday car, which doesn't have a support team of mechanics behind it, it wouldn't be too feasible.
Of course. Reliability aside there's another, taller hurdle. Anti-Lag is generally implemented by retarding the timing to extreme amounts during low boost moments (standing still or off-throttle) to open the exhaust valvles early and let some of the pre-combusted air/fuel mix into the exhaust manifold. This unburned fuel pretty much precludes any possibility of passing cold start factory emissions testing in the States.
However, the AWD split differential system is very cool, and can be applied to other cars.
This is pretty much incorrect. Not that you're wrong, but Top Gear is wrong. Just like everyone who quickly glances at the DCCD (Driver Controlled Center Differential) on the Subaru STi. Everyone assumes torque ratio can be changed; however torque split is constant and never changes. The locking ratio of the center diff can be changed from fully open to fully locked with 4 or 5 other settings in between. Torque is always 35/65 f/r (41/59 for 06+).
Of course, how torque is transferred between two shafts spinning at different speeds can be controlled instantaneously while driving, but this is definitely not the same as controlling the actual torque split, which is mechanically decided at design time to be 35/65 or whatever.
If you listen carefully to the Prodrive Engineer on Top Gear discussing how the diff works, you can assume he is discussing how the standard DCCD works utilizing steering angle (new on 06+), throttle position, yaw angle, etc etc.. nothing new there. His brief synopsis of the actual workings of the differential describe nothing new with regards to torque split.
This topic has been discussed at great length.. here a couple quotes from people who know what they are talking about..
The DCCD does not alter torque split. Torque split is a fixed property of the planetary center differential. For any DCCD setting it will be 41/59 (except for lock, which kinda renders the idea of torque split meaningless).
There are two limited slip devices in the 2006 center differential -- a mechanical one, with no means of control, and the DCCD one
It's not that the system waits before intervening, really -- it always acts immediately. It's how much of the torque from the faster rotating shaft is transferred to the slower one.