How Does AWD Work?
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- čas přidán 31. 05. 2024
- Here's how an all-wheel-drive system works in your car!
AWD is a term used in vehicles that have the ability to transfer power to all four wheels. The transfer of power is often computer controlled, and features a central clutch that allows for a difference between the speed of the front and rear wheels, which suits it best for on-road use. AWD systems also differ from 4WD / 4x4 systems because there is no LO speed transfer case.
Many modern cross-over utility vehicles employ a part time AWD system, known as a "slip and grip" system. If slippage is detected in the front wheels, some torque is sent to the rear wheels. The design and control of the system dictates how much of that power is sent to the secondary axle. Other vehicles have a full time AWD system, which sends even power symmetrically to all four wheels.
In this video, the ATTESA AWD system from a 2006 Infiniti G35X Sedan is taken apart to show what's inside and how it works. Inside consists of a shaft that links the transmission's output to the rear wheels directly, with a chain and electromagnetic clutch linking the prop shaft to transfer power to the front.
Skip to section in the video:
0:00 Introduction
0:56 Overview of the Transfer Case
2:08 The Teardown
4:59 How it Works
8:01 Electromagnetic Clutch Operation
Keep your AWD vehicle well maintained by rotating tires and changing transfer case and transmission oil regularly. You may purchase items for this here:
Gear Oil:
amzn.to/3mD45K5 (US)
amzn.to/3mBPoXJ (Canada)
Transmission Oil:
Nissan transmission Fluid:
amzn.to/2HbhPve (US)
amzn.to/3chZNTE (Canada)
Hex Sockets for drain plugs:
amzn.to/3iRnTXY (US)
amzn.to/2ZTfwUg (Canada)
Snap Ring Removal Tool (Angle Grinder) used in this video:
amzn.to/2FBL5uX (US)
amzn.to/3kAcuME (Canada)
This is the Camera I use:
amzn.to/2Y24ixX (US)
amzn.to/2Yhb3eo (Canada)
Link to Etsy shop where you can purchase speedkar99's brother's socks, t-shirts or hoodies:
www.etsy.com/ca/shop/Speedkar
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Its impressive how easy it is to understand this man, especially considering the speed at which he speaks, must be some kind of mechanical witchcraft
Thanks I'm glad you appreciate my style
@@speedkar99 I'm glad you work hard on making these videos accessible and in-depth enough for all, keep up the good work man
I agree
I have to put at .75 speed. Only way I can catch up
I think it has something to do with the toothbrush he uses to point the parts, haha.
I don't know why, but I smile whenever I see your old toothbrushes. I appreciate your sharing of knowledge. Keep up the good work!
Awesome thanks! Glad you could learn something
I can’t tell if you’re a mechanic or a full on automotive engineer or some mix of the two but you are exceptionally skilled at both explaining and demonstrating the mechanical principles of everything you cover
This is an old school youtube video. No self promotion , like subscribe bullshit. Just straight information, keep it up. love it
Thanks. I like to keep things simple and to the point. That being said.... Subscribe please 😉
"State-of-the-art snap ring removal tool" lol
Hilarious
Hahahahahah, yeah, state of the art 😅
I have my special snap ring removal tool and I am heading to my neighbors AWD Cadillac to see if this tear down is accurate...
Please keep me updated I've never opened a GM
@@speedkar99 I had to rethink the process, his watch cat was out.
Just use an angle grinder.
Special snap ring removal tool such as toothbrush like in this video?
@@CatarineausArmory lol easy man..
This guy explains concepts better than any other channel, and sounds like a better engineer than Engineering Explained
It's better to see real things and learn than draw it
You speak like somone run after you.is to fast
Dude this video is INCREDIBLE
I google searched for 20 minutes to get a vague ideo of how this worked but you told me so clearly in amazing fashion
Best car channel that I know on CZcams!
I love those old T-shirts that you use lol pretty universal. Thanks for Video man👍
Wow! Mechanical Genius + Expert Communicator + Flawless Editing = Perfect Video!
You gotta love this guy. He doesn't beat around the bush, doesn't mince words.
Why waste time??
@@speedkar99 Amen to that, brother. It was a very enjoyable and educational video. Thank you. We have a 1999 AWD Ford Explorer, and I don't think I can get the cover off the front differential without dropping the whole front axle assembly out. But that would mess up the alignment, and I'd have to remove at least one front wheel bearing assembly. The Ford dealer charged me $22 for just one of those "single use" wheel bearing nuts the last time I removed a front wheel!
It sounds like the previous owner never checked or changed the fluid. In fact, it sounds like it's dry and already damaged.
While watching your video, I realized that there is no differential between the FWD clutch pack and and the rear drive shaft, but, instead, that the two operate in a tandem setup, with the rear differential being directly driven by a continuous shaft from input to output of the transfer case. Now I can go home and take a cutting torch to one side of that front axle and just drop it and the front drive shaft out completely with no regrets or second guessing -- and without changing the alignment. We'll just use the car as a rear wheel drive vehicle. It's too old to waste time, money, and work to repair a feature I've lived without all my life, anyway. Thanks a bunch!
Why is this guy not having 2 million subscribers yet, because his videos are worth that much and more.
I wish! Maybe soon, please share! Thanks
Really interesting, thank you!
And the editing is perfect as always.
The video isn't to long or to short 👍🏽
That's my style! Thanks
too long or too short is correct
It’s the subtle touches of humour that make this channel so great
State of the art snap ring removal tool. I just love it!. This guy is AWESOME!
Did anyone get overwhelmed? I was lost shortly after! This guy is so knowledgeable I wonder how long it took him to learn all this stuff. Good to know there are exceptionally knowledgeable and qualified technical mechanics like this gentleman who are able to explain and demonstrate so simply without skipping a heartbeat. Very impressed. Did I mention how explicit he was during the process? Kudos to you, sir!
Thanks im glad you appreciate all the details
Your vids are the best. Very informative and entertaining. Thanx, brother. 👍
Great information. Very easy to understand and simple description. Great job!!
Nice one, thanks for that, it's so much easier when someone else does all the cutting and grinding
Awesome explanation and simplifying it!!!
Excellent Video. You are a gifted explainer. Thank You!!
I really enjoy watching your videos......you are excellent at explaining the inner workings......👋😷👍
Great explanation, also video editing and details choosing in your explanation. Normally follow someone disassembling something is hard to follow due to the mechanic to explaining together with the activity. But the way you do is great. Great video.
Also answered some questions I had such as "why with so many clutches this system is not hot like hell?" and "if this is a center diff, when opened all torque would go to the front free axle"
Good video 👍😊
You put alot of effort into making these so you definitely deserve a like 👍🏻💜💜
Love your breakdowns and explanations, i look forward to seeing you put it together one day! :-D
Not with that snow ring removal tool!
@@speedkar99 sorry boss
I really can’t put my finger on how or why your videos are so clean/easy to follow. Even if it’s something straight forward and common knowledge, somehow your explanation is cleaner then my internal dialogue. And I usually have no issue understanding me...maybe that’s my problem.
Always a master of teaching !
I like your pointer!!!
Thanks for the video!!!
Thanks for sharing your thoughts and great videos
You are really good at communicating in these videos
Glad you appreciate my video style
Excellent. That transfer clutch is from a nissan G35X. I used this in a BNR34 getrag box to eliminate the stock electric over hydraulic system with the electronic system. This enables true 2wd or 50/50 awd but enables me to control the centre diff for some magic results. Launch control being one of many tricks. This has allowed my 350Z to become a supercar
Is this bolt on BNR34 Getrag transmission?
Incredibly great video. Thank you very much.
Absolutely great video exactly what I needed to learn about awd
Awesome videos! Besides educational, they're very entertaining!
Very impressive !
Nicely done !
Liked/Subscribed a long time ago !
Thanks man.
Ur presentation is amazing
Thank you for the video, very clear and intuitive
Thanks glad you enjoyed it
Great video! Enjoyed every second of it.
Thanks
Thank you a lot for making this video
This guy is fast and furious, great video and a great job!
This channel is very informative!
Outstanding explanation. I was hoping you'd describe the clutch pack as a sangwich! Thanks for another great video
Sangwich 🤣
Happened upon your channel. Glad I did-very good explanation of something I’ve been curious about.
Glad you enjoyed it
It is good to realize that both the input and output of the clutch pack are rotating at nearly the same speed when driving only the rear wheels.
The non-driven front wheels drive the clutch pack via the front differential and shaft.
This greatly reduces wear.
Nice video. Much better than expensive and often inaccurate 3D animations.
They have to rotate the same speed almost all the time otherwise the clutch will wear out.
Really great video! explained things so well!
Thanks!!
best AWD tutorial ever made! 👍
Thanks
Thanks for the information i really appreciate it
You Are doing great in all your Videos. Keep up the good work 👌🙂
Thanks I'm glad you appreciate it
Great video!
GOOD JOB! very informative, interesting
I love your videos man keep them coming!
New video out today!
One of the best car videos I've seen
Thanks. What about it makes it the best ?
@@speedkar99 don't push it
That was damn interesting. I remember the early ones kept burning out the clutch!
you bro always come when I need your videos
Love watching your videos and learning more stuff. Clear and easy to understand, just brilliant!
Do you ever accidentally take one of your brother's new t-shirts? :D
Great explanation.
Man, I love how how concise this video is, plus the old tee shirts and special tools make it funny too. Keep it up!
Wow this is amazing content. Instant subscribe! I like how he is pointing using a tooth brush
Really great content! It's as equally informative as it is entertaining. I'm also glad that you only use the highest quality tools such as the "state of the art rotary snap ring remover", and the "precision Oral-B teaching pointer".
Thank you for doing this i learned a lot!
You are welcome
Epic work and info
Best info as always👍
You're a real master I'm so impressed 😂
Very good explaination! Enjoyed the lesson. Always wonder what separated a 4 wheel drive from a all wheel drive. Thanks for making this video.
Very welcome! Check out my 4WD video next to see the difference
It’s such a simple but yet interesting system
Yea interesting indeed. I'd love to see more complex setups
The whole internet is full of writer styles that explain this delicate mechanical gadget as if they are talking to an journalism loving audience. This gentleman, while he gets fully dirty in oil, he moves forth and back from mechanic level to schematic engineering level explanations, through schemes. He is so dedicated to go to the deepest knowledge and show it to us, that he kills the equipment fixers. The video has been quite smartly produced, combining quick, non-boring and non-academic speech with touchable knowledge, saving us from a long video with boring and anemic theories.
Perfect 👌. Thanks.
My cardboard studio. LMAO
He is a humble man somehow......
Can't really see myself needing to know all this info but it's still interesting to watch.
great work
you should do videos on different styles of awd systems. there's a lot of different designs. that'd be really cool! anyways this video is really informative.
Yeah that would be sweet if I could get transfer cases from all of them
Thanks for the info! 👍👌
Id like to see a video like this but with proper 4x4 transfer case, like patrol, land cruiser, wrangler, defender that kinda thing
It's very intresting... I smiled 🙂!
Thanks
Is that your brother's old cardboard?
Looking forward to the re assembly video .
It’s good.
Thank you for this video
You are welcome
Cardboard Studio :) Thanks for the informative video!
Great teardown, this is a alot simpler than I thought and it has a backup. You still get rwd if the clutch fails.
@@steph_tsf good observation
Thank you heartfully for the vidio
You are welcome!
Super dooper explanation I’ve got all wheel drive on my RAV4 never really wanted all wheel drive but the model I wanted didn’t give the option of 2 wheel drive but hey ho at least I know how it works now
All clear awd
Very good
Nice job
I am Indian boy 👦
Thanks
Excellent.
I appreciate my Outback even more now. Thanks for the tutorial...now put it back together, lol.
Haha
Great video :)
Some people are just made to teach 🤙🏽good job meng
Thanks
I do like Roti and its good to see another way of making it!
My brothers tshirt and my wifes toothbrush...I love your channel bro.
This is great!
Seeing this relatively light duty thieving clutch system design it doesn't seem like it would function at its peak for long even being a wet clutch. Good video.
Damn man, you’ve got videos all about the G35, saw your DE Rev-Up tear down and got curious, and the awd system you showed is the one in my car! Nice to know what’s going on every time I hit the gas (:
This is the vid i was waiting for sir! I have my awd fuse removed in my g35 effectively making it full time rwd. Always wondered if there is any sort of damage and this explains it. Thank you
Is it the G35 hr or de ?
@@automotivetv9861 de
@@octacore9976 can you do the same to the hr?
@@automotivetv9861 it works on 04-06 g35x. And i think those all are de but i dont think it has anything to do with de/hr
Yeah my brother rigged a switch to his G37X HR's AWD ECU to cut it off and turn it into a RWD at the flick of a switch. It also disabled traction/ABS so it's a really fun switch 😉
Newer 4WD transfer cases do allow for slippage for use on highways at high speeds. My truck currently allows for use of 4WD up to top speed ~98 MPH
What car?
Nice! Looks very similar to a BorgWarner Torque on Demand system, except with the actuator inside the transfer case. Early versions had a 2WD mode and a 4WD mode, but versions with integrated automatic all-speed traction control don't have a 2x mode for burning rubber. :(
Worth noting is that in US-made light trucks, a part-time 4x4 system typically has a dog clutch to lock together the front and rear axles, and either manual or auto-engaging front hubs. Full-time 4x4 systems have a differential that can be run open or locked, and front hubs typically don't disengage. The TOD system started with a computer-controlled clutch on a differential, but B-W found that the differential was superfluous, so it was dropped entirely. TOD is pretty effective for light truck and SUV use, though off-roaders & rock crawlers look down on it as "weak".
Thanks for that note
Well Done!!!!!
Thats the real What's Inside channel.
Yes Thanks
Another awesome video brought to you by Colgate .
I liked your video...perfect explanation...but it would be better if u disassembl it tidy
LOL.. I love your commentary and editing style..here's one for you..a 100% mechanical awd system with the ability to lock any or all tires at need with a Hi/Lo range to boot..hint..only one manufacturer ever did it between 1999 and 2004
Very good video men 💪😎 what about the toothbrush 😅 so funnie
It's the teach-brush