yup common issue....bad design...my last Mercedes tbh

Change your rear diff fluid every 10-20k miles it’s so easy to do

Look under the rear of the car to see if there's a diff.

Haldex, Borg-Warner, and Aisin make most of the AWD systems (and transmissions) these days

DJ BIS and the constant change in traction/behavior must be something to get used to as well.

If you're a more experienced driver, you turn ESP off so it won't intervene. ESP actually, in most cars (except for for "sport mode", or equivalent, on RWD only cars) should be turned off if you're more experienced, since then the car will be more predictable and - in the right hands - actually safer. I know and seen AWD drive cars get into some accidents because of understeer caused by ESP intervention trying to brake the front wheels (even rear wheels, depending on how said AWD and ESP system works) on slippery conditions and making the car slide foreword.

If you are a more experienced driver and you're reaching the edge of adhesion on the road then you are an idiot!!!

Unfortunately you are totally wrong. This transmission has an inherent and well documented failure - loud crunch when engaging reverse. Poor design. Sorry

meh, electric cars are boring and not practical at all

R o n n o c Who would’ve thought that 5 years later this would be available... The new A45 has drift mode so you can set all power to the rear wheels.

@@staticjet Oh wow.. Go drive an evo with a proper centre diff and yaw diff which was doin this 20 years ago!

A bit late but buy yourself the 2022rs3 you can choose rwd 😉

@@LB83. hahaha woweee. Well at least the new RS3/A45 have drift mode now lol ended up getting myself a WRX STI in the mean time 😛

3Vimages it should be 50 % . Centre differential will lock front and rear wheels if full lock achieved it will be only maximum 50 % unless front wheels are under braking. 100 % of the power to transmit to rear on FWD based 4x4 is not possible.

the drive shaft always connected to the rear to take up to 50% of the torque to rear, but the drive shaft is disconnected to the rear wheel with clutch plates. when press those plates together, it can connect the rear axial to the drive shaft to make rear wheel turn. In this case it is a basic connect and disconnect like a light switch. For the power that send to the rear, that will depending on how the gearbox do. because it has to connect to the front all the time, the transfer power to the rear seems to be leeching to the front through simple gears. That is why it cannot detach the front to make it rwd. The other way to do it is to put the same system to the front axial as the rear and become a transfer case so that the car can send more power to rear. However, this way will require a much better and stronger gear in the back (cost and space for smallcar usually cannot allow that) and therefore like the focus RS would only allow 60% to the rear since the rear gears are cheaper and flimsier. For rwd bias awd, u can check the A4.

🤢

You left out the small details; The A45 & CLA45 weigh a scant 1550kg & will both easily crack 25mpg combined. A Evo X weighs a hefty 1630kg despite being much less luxurious and a Evo X will struggle even 18mpg combined. Sure these Mercedes MFA (FWD-based) platform cars will not hold a candle on a rally course or Auto-X, but are massively better commuters, blend right into a corporate parking lot & great occasional sporty drivers. To each their own I'd say.

Trades46 I own an evo x MR, it is pig rich from factory, with boltons and tuning it gets better, I want to make a good track street hybrid car, not 100% dedicated track, but a trackable street car. And I saw an Aussie comparison where the evo x used less fuel in a test compared to a Golf R that has direct injection, it was a surprize to me.

Trades46 The problem is that these "official" mpg ratings are produced under minimal load, it has nothing to do with reality, so when you hammer it no 300 hp car will produce anything close to 10 mpg, and they are advertized at 30+ mpg, that is at low load only, and we all know people don`t buy strong cars to go economically and slow, for that we have small engines and eco cars.

Nagy Szilard Sensible drivers will only hammer their cars on track-day or Auto-X. Sure you can occasionally punch it on freeway when Cops aren't looking, but it's rare enough that I can safely say most "performance machines" are only driven at the limit 10% of the time. (If not so, I question your driving style & the validity of your license). Let me put it this way; a STI & Evo would are better cars 10% of the time you're hammering them at the less-than-legal limit, but the Mercedes-AMG are better (more comfortable, luxurious etc.) when you drive them on the regular roads, 90% of the time. And when you're NOT trying to get yourself a speeding ticket, then a 25MPG combined vs. a 18MPG combined would mean paying a visit to your local gas station each week vs. every 2 days. I don't need a calculator to know how much petrol you'd save annually yet still have equal level of occasional fun.

Trades46 I have an economy car as a daily driver, when I use the evo for the go fast stuff, if the mercedes had the evo x awd system and a good transmission, I would buy that as a track toy, but since they don`t make cars hardcore anymore I will stick with the few that are left.

On track, maybe. On public roads there is no such thing

JeromeDH92 isn't a corner on a track the same as a corner on the road?

TigR 5hark hahaha don't give up your day job.

TigR 5hark Your put downs are just like your jokes SHIT..!!!!

TigR 5hark guys just saying that a 4wd car that only oversteers on lift off its as fun as a fwd car .. almost all fwd hot hatches do this

Subaru are just the toyotas on the boring version So there's no difference...

Oh my, that's shocking. Did the dealer cover any fix cost? what happened to the car now. I am looking at the GLA45 now and seems like it has the similar issue with the Trans

Its not misleading my friend. Its depend on the type and segment of car. For the A45 in the normal controlling conditions(cornering, acceleration or deceleration) it split up to 50/50. Check at 2:08 it send the 100% torque to the rear axle by applying brake at front axle during the lost of traction at front axle, that way they send 100% torque to rear wheel axle. Mercedes made this version for daily use sports car with good fuel economy, by keep it as a FWD in normal situation. It seems very reliable AWD system, because they use proportional valve instead of servo motor to control the plates

Abhir Malhotra The way how you communicate looks like you belong to a third world nation. Did you read my comment properly. Whats the different info that you are sharing rather than repeating same of mine

You are not the only one who spent money on your education. There are lots of people who are doing same thing. You spent on your self, there is nothing you have done for society that you are bragging about. By spending 30-40k on your study is not a big deal and there are tons of people spend more than you.

j dutt 30-40k?? lol. and why is it about society all of a sudden and not about my grammar or the country where i come from? lol

This AWD System is based off of the HALDEX ALL WHEEL DRIVE SYSTEM.

Wtf? Mercedes presented 4MATIC in 1986, VW used 4motion as name in 1999 and Audi have a quattro.

2bach The principle of operation is the same as VW 4motion. Copied from VW

2bach And VW had produced it s own 4wd long before 4motion named syncro so...

he is right, this is basicly a mercedes version of haldex 4wd system and no it is not only a vw system, it is a pathen, volvo, ford, saab and vw all use the same haldex. This is because the cla is fwd based, any other 4matic benz have a different 4wd, more genuine and that is because the engine is not transversely mounted like in the cla, so in sum, almost every fwd based car has a very simular 4wd system to this.

Absolutely shocking. How is it running now?

👍🏻👍🏻👍🏻👍🏻

+bryan916 Then buy the same beautiful A class without 4matic. Sorted.