for the AT guys, whats the difference between the S5 AT and the 2.0t AT?

[Mercuri]

Anyone ever look into this? I bet the gearing is more geared toward accellaration , does the transmission work with our engine?

[ABanT]

I'd have to assume you didn't try looking into it at all?

They're completely different transmissions.

One is an automatic with torque converter and the other is a dual clutch automatic "DSG" which is essentially an automated manual transmission.

I'd imagine it would work since other markets you can get DSG with the 2.0t but I'm not sure if it's the same exact transmission.

[Steve_K]

To be more specific, the S5 Auto box is a tiptronic automatic transmission, or basically a torque converter.

The A5 comes out with 2 different types of auto boxes, depending if you have the normal, front wheel drive, or quattro. The normal, front wheel drive comes with Multitronic, which is crap and you want to avoid this type of auto transmission at all costs. It's basically a CVT type of transmission where the gearing constantly changes and IMO does not work, unless you 100 years old and drive like Miss Daisy. The Quattro on the other hand would be the A5 to go for as this has the Audi S-Tronic transmission, or what was mentioned, "DSG". This is the dual clutch transmission and works like a charm.

I only wish that Audi had bought out the older V8 S5 with S-Tronic, but apparently it could not handle the torque of the engine at the time. Obviously the newer S5, RS5 and even the R8 now has S-Tronic.

Funny enough, the RS7 still uses a similar Tiptronic transmission as the older V8 S5, due to torque issues with the engine. It produces so much torque, the S-Tronic from the normal S7 will break.

[ABanT]

I'm too lazy to quote on tapatalk but since when did the A5 come with a DSG in North America? B8 had a 6 speed tiptronic and B8.5 came with an 8 speed tiptronic. Unless you meant the B8.5 S5?

[superswiss]

Yeah, North America didn't get the A5 with S-tronic. Steve is located in South Africa, but OP is in the US. Also, the FWD A5 was only sold initially here. It hasn't been sold for a while now.

OP, you are not telling us what model years you are asking about. The B8 A5/S5 automatic transmissions were 6-speed tiptronics. These are traditional ATs with torque converter, but allow for manual shifting. The B8.5 A5 as stated above then got the ZF 8-speed tiptronic that's now found in about every car out there. The S5 on the other hand got the 7-speed S-tronic dual-clutch transmission.

The S-tronic is a completely different transmission, it's basically two manual transmissions merged together, one for the odd gears and one for the even gears, but the shifting takes place by wire instead of a mechanical lever. There is a clutch, in fact two, hence the dual clutch nomenclature that engage either the odd or the even transmission. The clutches and the gear shifting is controlled by the computer, but can either be initiated manually by the driver or automatic by the computer.

However, the thing with the Audi transmissions is that they aren't just transmissions. Audi integrates the Quattro drivetrain pieces into the transmission for compactness and efficiency. The S-tronic in the S5 contains an entirely new Quattro system, which was first introduced with the 2010 RS5 in the ROW. It uses an all new center differential called the crown-gear center differential. This diff works quite different from the older torsen system. It is mechanically self-locking and allows for brake-based torque vectoring on both axles. In order to put the S-tronic from an S5 into an US spec A5, the software of the car would have to change along with probably a few control modules in order to work properly with the new central differential.

Aside from that, the gear ratios in a transmission are specific to the engine to make sure that the thrust curves are lining up properly. So if you swap transmissions from an S5 to an A5 at a minimum you will need to adjust the gear ratios.

[Mercuri]

Talking the US S5 tip and the US A5 tip.

US didn't get DSG s5 until the b8.5, correct?

[superswiss]

Not sure what you are hoping to gain from switching a B8 S5 tip into a B8 A5. The gear ratios in each transmission are optimized for the engine's powerband. Without looking at the actual ratio's, I would expect that the S5 tip among other things has a shorter first gear to quickly get the naturally aspirated V8 into the sweet spot from a stop. My B7 S4 6MT which had a similar engine was like that. The first gear was very short. So is the RS5. Gearing can make up for lack of low end torque. You don't need that in an FI engine like the 2.0T that makes peak torque at lower rpms.

Yes, the S5 didn't get the DSG until MY2013 (B8.5).

[FaceSmA5h]

Just don't get an automatic if you're getting an A5