newb question
No, it is a VR6 engine. The 3.2L used in the TT is 15* bank angles with a single head, which equals VR6. It is modified from the original VR6, it has larger displacement (3.2L from 2.8L) and higher output for starters. The same VR6 is used in the VW R32 and the Porsche Cayenne V6. It has one head and is one half of the W-12. If you want full specs from Audi's technical manuals, PM me, I'll get them at work.
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Oh, while we're talking about the differences on the TT, let's talk quattro. The TT does not have a TRUE full time all-wheel drive system for it's quattro all wheel drive system. It uses a Haldex clutch and rear differential assembly. The TT is front track until the front wheels are recognized as slipping. You still can't put a TTQuattro on a two wheel dyno, the front wheels will register as slipping, then the clutch will engage, and the car will lauch off the dyno (possibly causing damage). Audi training materials also say that the haldex coupling is disabled while the parking brake is engaged. The A3 will use the same setup when it is released with quattro in December '05. The A4Quattro, A6Quattro and A8Quattro all have a TORSEN (torque-sensing) differential mounted to the rear of the trans case. This does not disengage at any time, like the TT does. The Haldex only uses the rear wheels when needed, the TORSEN always distributes the power between all four wheels.
If you can get under your TT (get it on a lift or something) Look at the rear diff. The front of the case houses an electronically controlled clutch, like what you use in a manual trans. They couldn't use a TORSEN center diff in the TT and soon in the A3 due to their transverse motor mounting. The trans is a front wheel dirve type transaxle. Rather then the engine being front to back, the cylinders go from left to right. If they could've fit the engine in normal configuration, they would have been able to use the TORSEN center diff. You can really feel the quattro kick in on the 3.2 TTS when the road is wet. I spun the front tires and before I could back off the throttle for traction, the Haldex clutch engaged and I was planted into the seat abruptly.
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