747heavy wrote:As far as I understand it, the drivetrain/gearbox is based on S2000, just the engine is a 1.6 I4 turbo now. There is no center diff, and the front and rear LSD´s can only have mechanical locking (ramps/friction plates).
Visco couplings are not permitted.
So, I would like to think, that the Xtrac value of 50/50% still holds some weight,
put I can´t say 100% for sure.
747heavy wrote:In the article it says that power of the new engines is ~50hp less then the current 2l turbos and torque is said to be at ~50% of the current engines.
The engine must have direct fuel injection
max. body width of the cars is 1820 mm.
This type of all wheel drive does not have a center differential - when all wheel drive is engaged, the front and rear driveshafts are mechanically connected and rotate at the same speed.
When a vehicle is turning, the front wheels travel a greater distance than the rear wheels.
Because this all wheel drive system does not have a center differential, the front wheels cannot go faster than the rear wheels.
This type of all wheel drive cannot be used on pavement.
Turning on pavement (even on a wet pavement) with all wheel drive engaged causes transmission windup and increases the chances of the transmission breakdown.
When all wheel drive is engaged, the vehicle heavily understeers and this can lead to an accident.
The all wheel drive mode shoud only be used on surfaces with low traction (mud, snow, ice, sand), for short periods, and at low speeds. In these conditions the transmission windup is eliminated by slipping of the wheels.
Hydraulic clutch couplings
Again, not really a differential, but another type of device used in AWD cars to engage the rear differential. With these types of coupling, the front and rear differentials drive hydraulic pumps - normally filled with oil. Any difference in the speed of the two pumps causes a pressure imbalance in the system that activates a clutch pack in-line to the rear differential to engage it. So again, when the front wheels spin faster than the rear (meaning slip), the clutch pack is engaged and the rear differential comes into play. These types of coupling typically also have braking and thermal overrides so that if the gearbox oil in the rear differential becomes too hot, or the car is braking, the clutch pack can be overridden and disengaged (without this, ABS-equipped vehicles would not be able to sense all four wheels correctly under braking).
The freewheel controlled drive from the gearbox to the front axle, which disengaged on the overrun.
This allowed the vehicle to have a permanent 4 wheel drive system by avoiding 'wind-up' forces in the transmission.
This system worked, but produced unpredictable handling, especially in slippery conditions
64.7 LIMITATION OF TRANSMISSION & SPARE PARTS
64.7.1 For a Manufacturer or a WRC Team, a list of linked rallies intended to be run with the
same transmission and spare parts must be notified to the FIA prior to the first rally in which they will
take part as:
- 4 links of 2 rallies per car and 1 link of 3 rallies per car for a Manufacturer or a WRC team which
has nominated all Championship rallies.
- 4 links per car for a WRC Team which has nominated 10-12 rallies.
- 3 links per car for a WRC Team which has nominated 7, 8 or 9 rallies.
64.7.2 For rallies which are not linked, Articles 64.9.2 & 63.3 will apply.
For Manufacturers and WRC Teams 2 gearbox and differential assemblies per car will be sealed on
the first rally of each link. Only these units must be used on the linked rallies. If 2 gearbox and
differential assemblies have been used on the first rally of a link, only once per season, 2 different
gearbox and differential assemblies may be sealed without incurring a penalty.
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