A-Class (W177) [Official] Mercedes-AMG A45 S And CLA 45 S

[Giannis]

@Giannis,
Could we get a little use of your recent specialisation in Turbos with your mechanical engineering study?
What is the advantage for MB in using roller bearings for their turbos in the A45S?
My guess is that in that way they do not need pressurized oil lubrication and is better suited for heavy thermal loads, but in t...

Turbochargers with roller bearings can withstand much higher loads, especially impact loads (such as a sudden acceleration, which comes from a spike in boost pressure) and they also perform exceptionally during start up and shut down, the two phases in which a typical journal bearing turbo would have its shaft touching the housing (i.e. wear). Also, since roller bearings have no compliance (they do not displace/ move under load) the shaft is much more stable (against unwanted oscillation) and can spin up to much higher rotational speeds. Also, reduction of oscillation can help achieve much tighter tolerances, thus improve efficiency.

The biggest downside is wear. Roller bearings at such speeds wear fast. And replacement means a complete removal and disassembly of the turbocharger. Also, since you have no oil, you have no cooling medium. So you need a different method of thermal management. Also, roller bearings for such applications are very damn expensive.

Size and weight of the rotating parts are a function of the volumetric flow rate you need to achieve, ie how much air you want to shift and at what pressure. Inertia is an issue, but keep in mind that with a proper roller bearing you can achieve a much lower coefficient of friction than with journal bearings, and that helps a little (not with reducing inertia).

 

[Centurion]

I think they went a bit too far on the styling of the A35 - too little differentiation IMO.

There is also two sides to the A35.

Without the aero kit it is too similar to the AMG line. With it, the resembles to the A45 is too strong.

 

[Ted]

What

More info on the Drift Mode, please.
When is the SB 45s coming out?

What the hell is the SB 45s ???

 

[Betty Swollocks]

And here it is, to my knowledge the first family hatchback to dip into the 3 second zone for 0-100 km/h. Insane.

Only if you don't count any bog-standard rental car.

 

[donkeykong]

What

What the hell is the SB 45s ???

CLA Shooting Brake 45s

 

[Ted]

Cheers

 

[LaArtist]

Mean as hell.
As expected by amg

 

[CrunchSlaughtered]

From Daimler.com:
" The active, fully-variable AMG Performance 4MATIC+ all-wheel drive distributes the power to the rear axle wheel-selectively by AMG TORQUE CONTROL – for top traction and the spectacular Drift mode. This is made possible by a new rear axle differential featuring two multidisc clutches – one for each rear wheel."

 

[Rolf]

This is hot hatch redefined. It will probably set new benchmarks and will most likely be the fastest accelerating hatch and most entertaining handling hatch on the market with its drift mode. Awesome car.

In acceleration it will be faster than the C63S to 100kmh and maybe nearly a match to 200kmh as well.

 

[mini_cooper4]

"In this way the drive power can not only be completely variably distributed between the front and rear wheels, but also selectively between the left and right rear wheel"

So... how much power can be sent to the rear wheels at the very maximum?

@Wolfgang
When will the SB 45s be unveiled?

 

[DjordjeC63]

Where is A45 Sedan?

That would be enemy to CLA45.

 

[CrunchSlaughtered]

That would be enemy to CLA45.

As is A250 to CLA 250

 

[Grosser]

That would be enemy to CLA45.

Um, the point of creating A Class sedan is to rival A3/S3/RS3 sedan..So I don't get why they didn't show it. Are they planning A45 limo?

 

[DjordjeC63]

As is A250 to CLA 250

Ok. Why Merc didnt make CLS63 AMG in this gen?

 

[CrunchSlaughtered]

Ok. Why Merc didnt make CLS63 AMG in this gen?

Because they also make mistakes.

 

[donkeykong]

There are no plans for a A45 sedan currently.

 

[Grosser]

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This dude says A45 is rear wheel drive biased...I wish there is some proper info about AWD system. Maybe it's the same AWD as in Focus RS.

There are no plans for a A45 sedan currently.

You have a link or a source?

 

[donkeykong]

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This dude says A45 is rear wheel drive biased...I wish there is some proper info about AWD system. Maybe it's the same AWD as in Focus RS.



You have a link or a source?

Source? MB hasn't given any indication for an AMG 45 version of the A sedan. We've seen CLA 45 SB and GLB 45 spy shots but none for the A sedan.

 

[CrunchSlaughtered]

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This dude says A45 is rear wheel drive biased...I wish there is some proper info about AWD system. Maybe it's the same AWD as in Focus RS.



You have a link or a source?

Yes it is similar to the system in Focus, I posted the description on the previous page. Mind you, this system is far from optimal for most of the situations.

 

[Matski]

@CrunchSlaughtered

Max torque split front to rear is 50:50 it's then full variable left to right at the back. This gives one of the rear wheels the most torque out of the 4 and can be used to push the outside rear wheel into a power oversteer situation..

.. Apparently.