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If the engine in the Audi TT is cross, then how can it be quattro AWD?
it makes no sense. for it to be quattro the engine must be mounted vertically.

1 year ago
The quattro transmision must be vertically mounted to be considered quattro. some say it's the AWD that's quattro. but when you look at the facts the quattro is the specially intended transmision with two diffs. one that locks. and you can not put the "quattro" transmision in a cross mounted car.

1 year ago
you guys don't get it.

1 year ago
DAMN.. I own two audi's. I know how AWD works. stop tellin me how it works. I know exactly how. except for the TT

usually Audi uses a Torsen differential which is located in a pretty central position. As the TT has a pretty compact chassis and restricted space at the front and central positions, Audi went with a Holdex differential mounted more to the rear of the car. It was the norm for Audis to have a 50/50 power split front to rear more recently this is closer 40/60 under normal driving conditions, with the power changing between the front and the rear in varying degrees based on where the tyres have the best traction with other differentials changing left to right, and this means, conceivabley, that majority Audi vehicles may be driven using only one driving wheel. Having to use the Haldex system in the TT means that under normal driving conditions the power is retained 100% to the front till either slippage or handling conditions dictate otherwise and power is shifted rearward.

Edit: BTW, I used to work for Audi and quattro ONLY applies to the AWD system and never referred to either a transmission gear box or engine.

A cross engine simply means that the engine is mounted crossway between the fenders. It has nothing to do with if or not the car has a drivetrain intended to deliver power to all four wheels, be it AWD or four wheel drive.

Often manufacturers of front engine cars mount the engine transversely, rather than in line with the car grill to firewall to let for a shorter hood. as well, especially in the case of straight fours all four cylinders in line the maker may also slant the four cylinder engine rearward a bit to get more rake on the hood and better aerodynamics. If the engine is upright and not transversely mounted then the hood must be pretty high up front to cover the high leading corner of the engine. therefore this results in lots of humps in the center of the hood, as you'll see on a good many Jaguars as an example.

Transfer cases, transaxle drive systems don't require the engine to be mounted one way or the other. it is just a matter of packaging.

I think you mean the engine is mounted longitudinally. Vertically mounted engines work great for helicopters,

AWD drive cars have three differentials, one for the front, one for the rear, and one to move power back and forth to the axle that needs it the most. The front and center differentials are usually housed as one unit in the transaxle in a cross mounted engine. The center diff is mounted 90 to the rest of the transaxle. this may be done either with beveled gears or a crown and pinion gear. From there a driveshaft connects the center diff to the rear diff. That in a nutshell is how AWD just works.

Edit: Maybe you have to learn to phrase your questions better so that people can understand what it's you want instead of whining about how nobody "gets it". we are only trying to assist you, so do not get your panties balled up in a wad if you ask a bad question and expect us to read minds.

Just look at the Freelander from LAND ROVER and you will find maybe an answer to what looks to get you confuse. It has a viscous coupling and and IRD, which transmitt the power to both differentials. Iternal Reduction Drive

Quattro simply means four wheel drive. Since there are four wheels this is all wheel drive. The output from a cross engine may be fed via the gear box and diff to the front wheels and via a crownwheel assembly to a second dif and to the rear wheels. Simple. All the cool stuff like stability control and locking diffs now comes from electronics applying brakes, etc.
I raced for some years usually Fords and using Mechanical diff locking produces a different effect. Faster power down to the road surface but more skill obliged

Witchcraft

The engine layout has nothing to do with an al lwheel drive capability of a car.

because it has a AWD unit made by HALDEX just as the 1st quattro did

If you really want to know how it works, check out a factory fix manual and look at the engine, transmission and driveline diagrams therein. They should answer your questions.

Audi calls its all wheel drive system quattro. It makes no difference where the trans and engine meet or the drive shaft comes out the side or back of the trans. Also it the move case that locks not the transmission. All that does is make it a 50/50 split all the time. Not something Audi says you may want to do unless your stuck.

All mix is possible
Drive.4x4 , 4x2, 4x1, 4x0
Axle...0,1,2,3
Move..Land/Sea/Sky
Fuel..Solid,Liquid,Gas, Solar,Nuke
Speed..100,200,300,600,1200kph