How the AWD System Works in a Mitsubishi Evolution. AYC ACD AWC S-AWC Explained!
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- เผยแพร่เมื่อ 27 ก.ค. 2024
- In today's video I explain the principles behind the AWD system found in a Mitsubishi EVO.
These animations are not accurate or scale drawings, they are simply for teaching purposes. - บันเทิง
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Really informative video....just a bit of clarification the evo 7-9 did infact have ACD (JDM spec) and all evolutions prior to the Evo x all wheel drive systems could be referred to as AWC.....the S-AWC came with the evo x as this platform now features drive by wire technology which saw the introduction of stability and traction control which further enhances the all wheel drive system.....
I rarely feel the need to comment on videos. However, I feel the need to thank you for helping me understand my own car and teaching a bit of history as well. Exceptional explanation and visuals. Deserves the like
No wonder why I love my 2022 Mitsubishi Eclipse Cross!
Just subbed, became a new evo owner 2 weeks ago. Videos like these are priceless.
I've been obsessed with this car for so long. I knew what the specail perks about the car I just never understood how it worked. Thank you so much for explaining it to me. I learned a lot.
7s onwards come with ACD . The introduction on S-AWC on the Xs just meant that all these systems could now talk to each other and compliment each other and also used the ABS the control the handling of the vehicle. Something that the 7,8 and 9 didn't do.
I have to say, MASSIVE kudos! This video is super simple, yet perhaps the most on-the-nose explanation of Mitsubishi's best drivetrain options. I find it hard to keep explanations concise to friends who ask me the same roundabout questions. I just forwarded a link to this to another friend, to better explain why an Evo X's drivetrain might be a great option to consider (for the reasons you've described in your video), compared to an older setup.
I really wish Mitsubishi weren't in such a bind. I'd love to see what would have happened if they didn't stop mass production of the Evo, nor killed off RalliArt.
One last note - there's one more variant of S-AWC that you didn't get to cover. And that's the S-AWC on the Outlander (and now, Eclipse Cross) PHEV. Same concepts as what you've described in the video, but instead, torque to the rear wheels is controlled electronically, and directly, by the electric dynamos connected to the rear wheels. This incidentally is the same roundabout blueprint for most AWD hybrid performance vehicles, that are being produced or slated to be designed for any e-Series homologation going forward. Go figure --- Mitsubishi got that right again, but hardly gets any recog for gleaning it before the rest of the herd.
Very clear explanation. The rally cars didn’t come with any form of torque vectoring (essentially what the diffs are doing), but rather employed LSD’s in the form of the RS diffs. It’s general consensus that if you go for big power hikes, the AYC rear diff is a weak link and most, myself included, swap out the AYC for the RS diff. Arguably it’s easier to push on the limit as it’s more predictable.
I always liked the AYC diff and could drive to its abilities. But going high torque means it had to go.
Nice video, but there is one major inaccuracy, at around 4:15. A normal LSD transfers more power to the most loaded wheel. It a normal differential that transfers power to the least loaded wheel.
JDM (and possibly ADM) 7-9 come with S-AWC by your definitions.
Nice vid on the Pump repair. I just did mines this weekend.
Cheers, that was super helpful.
Very good explanation
That was really informative, great narration and graphics 😁.
Thanks :)
How did EVO managed to counter the imbalance of the driveshaft position?
Very informative video
The ACD actively adjust the preload(lockTorque), and the AYC actively adjust the TBR.
Subscribed brother love it
Loving my EVO C
Nice Video! Thank You
It was definitely interesting. I am not entirely sure if i got it 100 % but at least 80 % was easily comprehensive
ACD does NOT send over 50% of power to either axel. it merely enforces a 50/50 toeque split when 1 axel is getting more engine power due to slipping. when the clutch pack in ACD clamps together, the 2 piece drive shaft essentially becomes 1, forcing rear diff and front diff to rotate at the same speed.
Exactly what I was going to comment
I love my 06 IX, love the clip to further remind me of how incredible of a ride she is 🙏🏼
Hey very cool video keep going on :) but something I have to correct the Evo 9 has ACD and AYC. At least in Europe.
All basic evolutions 7-9 (including RS models - they have no AYC) have the ACD. Evo X, in addition, has the analog of the ESP, that's why X' AWD system is called S-AWC
Amazing video thank you for this brother, I was wondering why the Evo 4wd was so good, wondering if it would easy to set up an ayc on a car other than an Evo if it's just essentially a clutch pack triggered on loss of traction to single wheels?
Ok so I get how the front diff works (mechanical lsd), but I'm still confused on how the center and rear diffs work. If they are, at their core, mechanical diffs (spider gears and all), wouldn't any clutch pack on any of their gears merely control the amount of slip between the 2 outputs? How can they achieve varied outputs to the front and rear or left and right?
Unless they aren't diffs at all, but merely 2 clutch packs in each unit. In which case, one of the clutch packs has to be constantly locked and the other partially or fully released. If they're both fully locked, it feels like a truck in 4wd on dry pavement. And if they're both partially released, you get power loss, heat, and a short lifespan. The rear unit makes it even more complicated, because it can't power the wheels symmetrically without one of the two above scenarios occurring.
Great video, may sound like a silly question but how do know if your EVO 7 has an AYC? Is it as simple as there is no mump mounted to your inner rear quarter panel??
Look under your car on the left side there should be the AYC pump
so next year I'm potentially looking at buying myself an Evo. I'm torn between an 8 or a 10, which would you recommend and why? and what is the good and bad points of both?
I went for an 8 its just a bit more classic rally the last of its kind if you like. The 9 and X just look too "street" for me not as rally looking.
So I recently got a 09 Ralliart and it has the AWC button. But I’m unsure if it is has AYC or ACD. But when I press the button 3 modes appear; tarmac, gravel, and snow. Anyone help me out?
Which is better awd system, ayc or new gt-four in GR Yaris?
Ev8 mr and post 2004 came with ayc and acd its a popular delete they do for racing and drag, also first evo 8 didnt have juet regular awd like the rs but not front lsd
so how does this S-AWD compare to the SH-AWD and the Quattro that they have on the RS models, thank you for your video and it was very nice to explain.
That's a good idea for a future video!
Mitsubishi also installed AYC in the MK3 Galant VR-4 but only the automatic gearbox not the manual version.
I didn't know that. That's funny how they only put it on the auto
Galant VR-4 Type-S 1996-2002 has AYC, but I'm not sure that if Type-S variant only INVECS-II transmission is available.
I want to build a vw golf 4 with the AWD system from Evo 3 or X . I have enough money for that but not for an Evo. So I decided to mix them and luckily many things are identical
Might be a bit tricky
Is this valid also for Raliiart models ?
That is why EVO X is not as bad as you think
I was expecting to see what is the power split was between front and back with the transverse engine layout
Different power settings on those Tacmac gravel snow
which has the better system subaru or mitsu lets say 1999 model evo vs sti
Thanks for the comment. I'll start working on some more explained videos 🙂
My buddy tried to tell me our usdm evos had ayc, i knew it was too good to be true. We have a semi-optimally shimmed lsd rear diff
US Evo X do but thats all sadly
You say LSDs will always send power to the least-loaded wheel, but the opposite is the case, isn't it? I've been watching a bunch of videos on LSDs and I'm under the impression the entire purpose of an LSD is to send more torque to the wheel with better traction- open differentials will always send power to the wheel with least resistance, which is exactly what LSDs are designed to combat..?
Good question. The clue is in the name. They don’t stop slip or provide drive, they simply limit slip. Thats why AYC is so special.
@@rowanlewisuk Oh I think I see what you meant- that LSDs never COMPLETELY cut power to a loose wheel? True!
Cosine Hyperbolic check out my explained on the subaru sti you might find that interesting
With lsd you always have more slip on the least loaded wheel, in comparison to the loaded wheel. In active yaw control you can divert more power to the loaded wheel. This is not possible with a normal limited slip differential.
@@TheeZakjeNL21 Not sure what you're saying- having more slip on the wheel with less grip will essentially always be true, that's what that means. And a traditional LSD does provide more torque to the higher-traction wheel- the following explains this pretty clearly:
/watch?v=WeLm7wHvdxQ
In fact as I understand it, all LSDs divert more power to the loaded wheel than the loose wheel- even something like a Torsen (which you wouldn't expect upon first understanding how it works). That's the point of an LSD.
Is there a source with this info, I just watched a donut media episode and they say 7+ has ACD in combination with AYC (JDM)
AYC was available from Evo 4 and ACD got introduced at Evo 7 (JDM spec evos)
This is by far best explanation of ACD and AYC system I ever saw :)
Please can you explain why the fiesta st180 is more desirable than a lancer evo? 😋
I can't explain what I don't understand
I think you need a psychiatrist to explain the mind of the kind of person who would think this 😂
Q: What is the difference between a Ford and a porcupine?
A: Porcupines have pricks on the outside.
because the masses are generally ignorants, lazy for the own research and easily lead by the media
Sorry I can't explain the impossible
The acd opens to make the car turn, not locks up
Very good video.
Now I know why they say; you drive the Subaru, the Evo drives you.
My Outlander has AWC and it kicks ASS
What dose the 2010 Ralliart have in us if it has the evo 9 drive train ? Supposedly
It doesn't. The 2010 RalliArt... if you're talking about the Lancer, not RalliArt variant of the Evo, has the same Evo X MR drivetrain. Same exact components. Only, that it has a mechanical, torsen-type rear diff. That's the same part as that of an Evo 4-9 RS - and the only thing in fact that you might consider that's part of an Evo 9, in a manner of speaking.
My JDM evo 9 come with both ACD +SAWC should be posting some pic on IG @evonation_ix
Your explanation of the ACD is incorrect. It does not send more torque front or rear. That is a common misconception, because Subaru centre diffs work that way, but that's not how the Evo's ACD works.
It is ALWAYS a 50/50 torque split. It is physically gear that way. The ACD just goes between a locked limited-slip state (accelerating in a straight line) and unlocked open state (when turning.)
www.evoscan.com/technical-vehicle-manuals/62-acd-ayc-sayc-at
stephen is correct, a very common misconception. it's always 50:50 power, and the center diff is like an lsd between the front and rear axles. the LSD explanation is also incorrect... it's purely about lockup between left and right. in that sense, it wants the outside wheel (more grip) to travel at the same speed as the inside wheel (less grip).
Ayc is like an atb diff?
Don't forget the evo 9 wagon had not front lsd but it was a drift wagon 😈
2:39 you mean the other newer STI models do not use an ACD ?
Abc
I have an x lol
Correct me if I'm wrong ( tacmac 50/50 ) ( gravel 40 front 60 back ) ( snow 60 front 40 back )
That's a common bit of misinformation. Torque split is always 50:50. The explanation of the ACD in this video is incorrect.
www.evoscan.com/technical-vehicle-manuals/62-acd-ayc-sayc-at
@@StephenStrangways yeah good clarification. ACD only has one clutch pack and just locks up the centre diff. Prior to ACD they used the Viscous Coupling Unit (VCU) but it takes a lot longer to lock up so you have to wait for it to catch up.
AYC has two clutch packs (one for each wheel) and therefore can actually bias torque between the left and right rear wheels.
It's pretty much a haldex system right?
👍👍👍
Evo 9 UK came with SAYC.