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Traction wise, Haldex is very good. Where you really feel it is in the dynamics of the car. Haldex cars tend to feel like front wheel drive with infinite traction.

The best explanation of the two systems that I’ve ever heard...perfectly explained and illustrated .. I now know my mk1 tt has fraud wheel drive.....love it.

Golf R owner here. A little hurt, but whatever... Faux Wheel Drive is better than Front Wheel Drive.

The 1.8 mk1 TT is a very underrated car, the haldex system leaves it at no disadvantage against other Quattro systems, it has unbelievable grip as long as you don't lift your foot off the throttle the rear wheels won't disengage.

This was a great video! It can actually be hard to track down real information about these systems and you managed to condense everything and demystify it. Much appreciated. Subscribed.

Great video on both systems! As a TT Mk2 owner, the question of the "lifetime" haldex filter often comes up in our forum. The bottom line is all Mk2's Haldex have a filter that should be changed when the fluid is changed. The confusion became apparent when I was discussing it with my Audi Service center. it turns out that from 2007-2009 the "3.2 quattro+" (JZX, JJN, JUY, KJU, KNS) parts diagram is shown WITH a filter while the "quattro" (KMC, IMD, MMO, MMK) is shown WITHOUT a filter. From 2010-2015 only the "quattro" (MMK, MML, PYG, PYH) is shown WITHOUT a filter. There are no illustrations of the 3.2 quattro+ WITH a filter, or any parts lists for it during this period. In addition, the pump should also be removed and the strainer on the end cleaned. It's actually one of two filters in the Haldex system. I have no idea why Audi's parts list has an illustration with the filter and one without and then elected to keep publishing it without one from 2010 onwards. But hopefully this may help explain why dealerships and garages always argue "There's no filter for a Haldex". They're both right and wrong depending on where they're looking. Bottom line, when you get your Haldex fluid changed, replace the filter and clean the pump strainer! If necessary, explain this in detail to your service guy or they will not do it as it's not part of Audi's Standard Operating Procedure for Haldex service. www.ttforum.co.uk/forum/viewtopic.php?f=19&t=1850793 .

A6 Allroad BiTDi owner here. Love my car. A true tank in the snow

Excellent presentation sir. Everything I wanted to know but was afraid to ask.

What a GREAT video!! VERY informative, thanks for posting!

The quality of the videos are fantastic. Always solid information when I watch. Please keep up the great information for us all.

this is the best, most comprehensive, amazing video on these systems on the internet. thank you so much for this video. great job

I own an Audi A3 with second-gen Haldex. In everyday driving, it's an awesome system. It's there when you need it. The fuel consumption is pretty good also at 6l/100km.

The most informative video I've seen yet on this topic! Thank you. How did you get the bias numbers for each generation? Logging or just from documentation? I always thought it was 90/10 because of gen 1, but never heard about the changes in gen 2, 4, 5. Interesting stuff!

Amazing video & thanks for the great explanations! I enjoyed the demo videos as well. Nice improvements to the video & keep it up!

Coming from 3 Subaru STI's to my current Audi S3 I have to say I'm impressed with the Haldex, good snow tires and I would say it's every bit as capable on snow and icy roads, even deep snow is no problem as long as I'm not high centered. Just as fast, a hundred times more comfortable and fuel economy is about 5mpg better, and I don't look like a spoiled high school kid driving around anymore. Great video!

Excellent comparison!!

Subbed, because this video is fantastic!

this is awesome, ive learnt heaps about my 8p a3 20.t quattro and ive always wondered how the awd system really does work and this has taught me heaps, thank you lots.

I have been looking for this video for long time! Thanks !!!

This is surprisingly good For once, KZfaq recommended quality content !

Love it how the TT mk1 still looks a modern car!!

Thank you for educating us. The beauty of the web. You don’t have to spend so much money to learn something anymore.

Very nice video, glad Youtbe randomly recommended me this. Thanks! I've been considering buying an old Audi TT but I had no idea it's not Torsen-based Quattro AWD system.

This is great. Gen 1 and 2 quattro enthusiast here. If you have not experienced one of these in the snow, do it! The gen 1 is a huge favorite, plus the lockable center and rear diff is a neat feature, albeit rarely needs used. I did find the humor in Haldex being "fake" awd. I use that a lot on newer Audi/VW friends, jokingly of course...sort of ;) Nice video!

According to wikipedia the 2.7 million USD Bugatti Chiron uses Haldex Four Wheel drive system.

Thank you, at last I have been able to find someone who can do a great explanation of how the Haldex all wheel drive system works on my Audi TT Mk 1. Even better you have compared how the system compares to normal four wheel drive including pro's and con's of each. Thanks for doing a great informative and interesting video :)

Very entertaining video, answered all the questions I had when researching this topic

Thanks, a great video, I've been looking for something that compares these differences for a while. The strange thing is I had one of the first TT's a 220 Quattro and that didn't feel like a FWD in terms of handling and it wore the tyres like you would expect of a full time 4WD, i.e. pretty equal all round where you would expect to scrub the fronts out using a primarily FWD system

Awesome Vid!, thanks for explaining a much heated debate on the audi world. :)

I like watching your video keep it up.. love how in depth and how organized your videos are..

Great in depth video. Thx for the effort you put in this video ❤️

Nice video man and nice breakdown of the Gen one Haldex! As an avid Mk1 TT enthusiast and aspiring Motorsports driver, there are solid solutions to turn the sluggish reactive Haldex into a reactive weapon! For example, HPA and UM both provide solutions to manipulate clamping conditions including those based off of throttle positions and engagement under heavy breaking as well. Biggest advantage is that in the 8.5 years of heavy exposure with the car and it's community, I have yet to see any documentation of a failed or failing Haldex system due to over stressing (this is of course assuming proper maintenance due to increased abuse). The thing is nearly bullet proof and takes the abuse like a champ!

I have had a 2001 MK 1 225 Quattro TT coupe for 17 years. And regardless of the Haldex's supposed shortcomings, it has been great in the snow with all season tires and awesome with winter tires. It works so well in both snow and other slippery conditions that I am thinking that maybe those Audi engineers knew something.

Best classic tech video on YT, but in the future I expect 4-electric-engine drives with fully electronic control.

Great video! Loved the detailed breakdown of both systems!

Very funny! :) I have a Saab 9-3 Turbo X 6MT. This uses the Gen 4 Haldex, but has E-LSD in the rear. Absolutely fantastic AWD system put a lot of Subarus to shame this past storm here on hard, long life commuter tires. In addition, I'm not sure about Audi, but the SAAB can put up to 85% to even a single rear tire if needed... I, too, would prefer a torsen mechanical as far as simplicity, robustness and life expectancy of course, but as far as function goes the E-LSD in the rear of this Gen 4 is exceptional.

I think this shit is great. Thanks so much for doing videos like this. Makes you appreciate all the systems so much more. Cool.

I never new this. Keep teaching me new things. I live in Gastonia NC, I need to swing thru your shop for my b5.5.

Wow Txn for these infos! Clear! Well made! Kind of information I don't need but really interseted to learn precisely!

Haldex is from Sweden. Before haldex vw 4 wheel drive was called synchro. Volvo and saab use also haldex.

Was getting ready to fire up my flamethrower after the first half of the video - good thing I kept watching. My RS3 might be faux wheel drive but you wouldn't know it from just driving it. I was able to get some fun rear-end-slide outs in the snow last week without even turning traction control off. In any scenario where i want 100% power going to my rear wheels, I'd be in an M3, not an Audi anyway. But there are other reasons I preferred the RS3 (and have been very much enjoying it).

this was very educational, good vid.I have that mk1 TT model

I have a 2015 Golf 7 with the Haldex 5. It works way better than I thought, great system for everyday driving. And the reaction to the rears when losing grip with the front wheels is just ridiculous. It’s as if the car is a full time awd. I’m impressed!

I'm still happy with the AWD system in my 2018 S3. With winter tires, it's just as good as by 2015 Subaru Forester XT was.

Haldex Gen 1 was not only found in the Audi TT! At the same time they were also found in the MK4 GTI’s and Golfs in Europe. You can also get a performance parts for the first gen Haldex system.

A fantastic explanation ! Keep up the great work!!

Really great video, needed something to better help me understand what lies underneath my 2018 S5. Very glad I went for the optional sports diff on the rear now!

Hilarious! How did you keep a straight face? My guess is you don't like the faux wheel drive system. Forgery wheel drive! Dude, this is your best video! Love it and I learned a lot.

Controller upgrades to the GEN 1 Haldex systems were also available: Blue and Orange controllers. I had a couple MK1 TTs with the upgraded Blue controller. They worked great in Minnesota snow.

Very informative! Thank you for sharing

i have a 2002 audi tt quat and a lot of thanks to the guy who made this video very informative to the point's thank you very much really enjoyed it.

So as the owner of a B7 Auto and Manual and a 2017 GTI, I have to say that while I LOVE Quattro and will always own a Quattro vehicle, there is something to be said for dailying a car with just front wheel drive for fuel economy. Also, if you haven't test driven the Mark 7/7.5 please do yourself a favor and check it out. It's absolutely uncanny how much performance is packed into this Golf.

I would like to watch a video with the same quality as this one about the AWD system that is on current TTRS and RS3. Thank you

Awesome video, very informative. Thanks! 👍🏻

Good detailed info, thanks. I have an A6 (C7) 3.0 with non-faux all wheel drive and I love it. I've gotten use to the front-heavy feeling of the car, and really appreciate its performance here in 🇨🇦.

I don't know man, I have haldex in my MK1 TT 3.2 VR6 and she rips in the snow and wet weather. Never have grip issues, it hauls ass. Deep snow or anything, I've never had issues. I understand he calls it's fraud wheel drive but god damn does it work well all wheel drive wise.

I've got both a B5 quattro and a Skoda 4x4 with gen4 Haldex. Having no ESP at all, the quattro is more willing to send the power to the rear axle on throttle while removing much of the power from the front. This makes it predicatable for me on snow as it will act like an RWD, sending the car into fishtailing and still remain in the curve while also responding to countersteering. From that point, it can be held on track with throttle. The Skoda on the other hand, will not go into a spin with ESP. With ESP off, the turn has to be entered with no throttle (since revving would make the front axle spin and understeer) and even then it needs a lot of work to keep the drift, because the front wheels lose the ability to steer once the start to slip.

upgraded from 4motion to Quattro.. Very insightful video

the vid i ve been looking for thanks !

QUATTRO !!!! the world's best permanent all-wheel drive.

What about the HPA gen 1 Haldex controller? This makes the car either front wheel drive for fuel economy or full time yes full time 50/50 split!

Good point on the handling advantages of transverse engines with the Haldex set up. I remember jumping out of my 8N TT into a B6 A4 (a loan car) when the TT went in for a service. The TT was always front heavy, but it was nothing compared to the big lump hanging out the front of the A4. Compared to the TT, the A4 turned into corners grudgingly, even at moderate speeds.

Great video...WOW! Even after all these years the Mk 1 TT is still a lovely looking car.

Haldex is actually what we all want in every car. FWD for the day to day, because lets be honest, when on earth do we actually need 4WD? (Apart from the one and only time you do a hard launch in your new car), and 4WD when the a few bad winter days arrive. Perfect.

You can set up more traction to the rear in Gen V in VagCom.... That said, I think my old "real" quattro is still better than my decades newer Haldex system. Also, when I do launch control, those rear clutch packs "Grunt" on take off (Stage II with TCU tune also). I think the biggest difference for me is on-limit handing which is much worse in my Haldex hot-rodded S3 than my old Big-Turbo Torsen A4. The A4 you could tail out like an M3, but the S3 even after thousands in suspension and chassis mods, still won't rotate and ends in understeer.

Superb video about the quattro system. Thank you!

Great video. I absolutely love my 98 B5 A4 1.8t Quattro. That little thing is a beast in terms of walking through snow, wet roads, even mud to a certain extent. Mine has the 5spd manual and a decent k04 turbo upgrade...so I definitely get slightly less gas mileage - lol. I had to search for a while to find one that had that setup...without being ragged out by someone running 25+ psi! It's a fun little car...it actually came with the AEB head and all. For an all around fun little project - it checked every box that I wanted it to come with. By the time I'm done...it'll be my little toy from here on out. I actually had a daily driver already when I bought this...so the limited space wasn't a big problem. I have been absolutely amazed at the handling and the ability of this little sleeper! It's just a little 1.8l with a big turbo...so it's not smoking Mustangs and other sports cars - but for a little 4 banger with awd...it'll blows people's minds routinely, lol. Like I mentioned earlier - I bought it for a project - I had always liked the Audi sedans of that era...before they came with a massive amount of fluff that nobody really needs...and I was originally looking for the s4 with the 2.8 or possibly even the 4.2l v8...but as I searched...I came to appreciate the 1.8 turbo and decided that I would go with it and just upgrade to a big turbo setup. I like the versatility - and with the exception of finding upgrade parts for the AEB - it's not real difficult to find whatever I want pretty reasonably priced. The quattro like my B5 - especially with the 1.8t and 5spd manual setup - is a great little car for a custom build project. IMHO anyway. There aren't too many extras to worry with...and you don't have to be a top notch import mechanic to end up with a pretty nice, decent priced, easily maintained, custom project that turns heads and inspires smiles pretty much everywhere I take it - yet at the end of the day - it wouldn't completely crush me if I had to start all over again. A good friend of mine told me not long ago that "Although he's not at all surprised that I am so hopelessly in love with a sexy German beauty - practically HALF my age....she's not quite how he pictured her!"

Nice video, however max 50/50 torque split for haldex is not exactly correct, that is just in static terms. But the actual, dynamic torque split may go much beyond that value, in theory almost to 0/100, in reality rather up to 10/90. This system cannot spin rear wheels faster than front ones, but it can send much more than 50% of torque to the rear.

There are upgrade modules for Gen1 Haldex also, highly recommended (I got the blue unit). They engage based on throttle pedal position. 40/60 torsen feels much more RWD like and TT requires very different driving style and is harder to drift. This is also due short wheel base and very nose heavy design vs A4.

awesome video! I am new to this platform. I moved on from an old school gc8 subar to a 2004 Audi S3. I am happy with the car :)

Excellent video and illustration. Perhaps an updated video on the latest tech would be useful.

I have the Sport Diff in my S4. Everyone says you NEED it, but I beg to differ. Im not racing my car everyday...

What should have been the number one Pro for for Haldex is packaging. The Haldex system can easily be packaged for a transverse engine unlike a Torsen or Crown gear setup. Also, in the current longitudinal AWD a Torsen center differential isn't used anymore but a Crown gear center differential. Also, recently the Longitudinal cars are getting the alleged Quattro with Ultra systems which acts pretty much like the Haldex does. It can completely disengage AWD too. In Haldex, the driveshaft to the rear always spins and a clutch pack engages the rear diff. Quattro Ultra can even stop the driveshaft. The longitudinal cars such as the Allroad and Q5 lost that permanent connection to the rear wheels and can send 100% torque to the front axle just like Haldex. The longitudinal S and RS cars will maintain the Crown gear for now but Quattro with ultra is finding it's way into the longitudinal line up. The explanation in this video is dated (Crown gear replacing Torsen, Quattro with Ultra) and the landscape has changed recently. There isn't just two systems. One of the advantages you list for the so called torsen system (crown gear actually on your car) is the possibility of adding a rear sport differential. That is not a system capability per say but a audi choice. Volvo had some Haldex cars with a torque vectoring rear. It can be done with both Crown gear and Haldex systems but Audi only does it for some longitudinal cars.

Amazing! Great explanation!!

Very informative, thanks a lot!

I just did a service on my haldex system on my mk7 4motion wagon and it cost me $25 for the fluid and took 10 minutes, so the service cost is minimal

@15:50 TT with Haldex still gets away quicker though, doesn’t it? 😉

Very informative video, thank you.

thanks man, good job, clear and neat.

The TT is a Haldex (Not actually Quattro but a Volkswagen 4Motion because it has no space to fit a Torsen) and the S4 has Torsen which is "Actual Quattro" because it can fit one, this has always been the case with smaller vs. bigger Audis, old S3s for example were as small as the TT and Golf so they had Haldex instead of Torsen. The main difference is that Torsen is always on and Haldex isn't.

He pokes fun at Haldex BUT Haldex is used in the Bugati Chiron and Lamborghini's. Neither of which have cost or fuel consumption as a design requirement.

Thank you for it! Waiting for Sport diff narrative!!

Yes. Keep doing videos like this. This was great. Oh and do a mk7 is38 install video while you're at it.

ok but the most important part of any drive system is the tyres ie i have a landrover 1990 defender with BF goodridge MS and have fitted air locking diffs (never got it stuck) also i have a 1982 Audi quattro turbo flying fin replica which summer time Michelin 225/15 winter time proper soft compound snow tyres best of both worlds only downside is exhaust on Audi which rots quickly

Well, my fraud 2001 TT quattro behaved excellently in the snow compared to the drivers stuck on the side of the road trying to put snow chains on their cars.

Great explanation! I've actually driven the mk1 tt and currently own a a4 b8!! obviously the Torsen is the way to go just because you get that throw into the seats but in my driving experience I think Acuras Sh awd is probably one of the best awd systems using torque vectoring. Quattro engages the brakes a lot in the snow which is safer I guess but Sh awd makes me feel like I'm in Tokyo drift and powers out of any corner. For the simplistically of Quattro torsen being almost fully mechanical other than sensor monitoring it for brake application I prefer it.

I learned a lot here. Thank You

So Quattro vs 4motion...

Gen 1 Haldex also have an upgrade and makes a huge difference.

Tank you . Now I finally understand how it works the Torsen and Haledex sistem . I have an A 3 with Haldex sistem , obviously ,but I’ve never had any problems in the winter season ...and the winter season ,where I work ,there’s a lot of snow ( Dolomites ,Italy )

Thanks for the in depth info! 1966 beetle, 2016 gti, 2016 audi tts. My first quattro! Kinda wish it was full time awd! Still love the car!

Fraud Wheel Drive hahaha

There is an Error: Haldex Gen I has 70-30, not 50-50. Haldex Gen II has 50-50

Thanks for explaining this!

Good video, good explanations 👍🏻

where is the quattro ultra?

Torsen reacts without any delay, constantly switching power, without usage of computer and sensors it is purely mechanical. Haldex have delay, sensors have to detect slip, then computer acitvate valve then it will put power on rear axle.

Thank you for this information it was very interesting 👍

Thank you! Finally someone did a comprehensive comparison between real Quattro and a new Quattro-Ultra (Haldex)!