Цитата
C. How the ACD works
In short, the ACD unit hydraulically controls the limited-slip locking state of the center differential which ranges between full locked, full open, and every point in between these two states. It calculates what the optimum locking amount would be using real-time input from the previously mentioned sensors and which ACD mode is selected. The ACD is extremely fast in operation, bettering the performance of the standard VCU and Viscous units. (3) (7)
When the car is accelerating or decelerating rapidly, the ACD begins to engage the limited-slip locking on the differential. The harder you accelerate or decelerate, the more it locks. This is done to provide maximum lateral stability and wheel traction. (3) (8)
The ACD allows the differential to operate in more of a free state when steering movements are made. When turning, the wheels in the front have to travel a further distance than the wheels in the rear. This is because the wheels in the front travel using a larger turning radius than the rear wheels as you can see from this picture. (turning radius.gif) So in order for smooth turning, the center differential needs to become open to allow for the front set to turn at a different speed. If you were to leave the center differential locked, the wheels would skip and skid badly. (1) (3)
(Picture from www.howstuffworks.com and www.mitsubishicars.com)
If the front wheels are spinning faster than the rear wheels, then the ACD begins to lock the clutches up. If the amount of force exerted by the front wheels is less than the amount the clutches resist, then the slip is stopped and both front and rear spin at the same speed. However, if the force the clutches can resist is less than the force exerted by the slipping set of wheels, then the wheels will slip, but only by how much remaining force the slipping wheels overpowered the clutches with. (1) (9)
D. How the Tarmac/Gravel/Snow switch influences the ACD
Despite popular belief, this switch DOES NOT change the torque split. The differential is geared at 50:50 and cannot be changed by the push of a button. What this switch actually does is quite simple. Each setting determines how long the ACD will delay in freeing the center differential after a steering input is made. In addition, it will determine how much locking force the ACD will exhibit on the clutch pack and center differential. (10) (11)
Tarmac is the setting to be used in dry, paved conditions. In this setting, the ACD will almost immediately allow the center differential to go into a free state upon detecting a steering input. Additionally, this mode provides the strongest limited-slip clamping force of the three modes. (7) (12)
Gravel is the setting designed for wet or loose roads. In this setting, the ACD will delay in freeing the center differential for a moment (possibly 2-3 seconds). Of the three modes, this one has the second strongest clamping force. (7) (12)
Snow is the setting designed for, you guessed it, snow. In this setting, the ACD will delay in freeing the center differential for much longer than the other two settings (possibly 4-5 seconds). Of the three modes, this one also provides the least amount of clamping power. (7) (12)
**************************
вариант отсюда
http://forums.evolutionm.net/showthread.php?t=175195
может все же разберемся?
хочется действительно правдк знать.
кто может перевести? мой английский говорит что ближе к истине
idono
стоит ли верить данному ресурсу, вот в чем основной вопрос???
Добавлено спустя 2 минуты 20 секунд:
Фак, думаю, тоже полезен оттуда.
вопрос в компетентности...
Цитата
IV. FAQ’s
1) All of this is over my head. What can I do to not be so stupid?
- SEARCH! All of the answers I provide in this guide were found searching on EvolutionM.net, SoCalEvo.net, NorCalEvo.net, & LancerRegister.com in a few hours. Digesting it took a bit longer though. If the issue is that you don’t understand the basics or basic terminology, then I would suggest starting at howstuffworks.com or picking up a copy of Car Hacks & Mods for Dummies by David V.
2) What do the Tarmac/Gravel/Snow settings do?
- They determine how long and how strong the ACD will engage the limited-slip of the center differential before allowing to go into a “free state”. See section II – D
3) What is the torque split in each mode?
- 50:50. The center differential is geared at 50:50. The modes do not determine the torque split. See Section II - D
4) Can I change the torque split with a new Center Diff?
- Yes and no. As of the time that this guide was written, there are no center differentials that change the torque distribution for the USDM Evo’s. However, there is supposed to be one made by Cusco that works on other market Evo’s. See Section III - F
5) Is the ACD weaker than the non-ACD Evo’s?
- The center differential itself appears to be similar to the version in the 03-04 model years, but it is connected to the ACD clutch pack instead of the VCU. Since there are hydraulics & electronics involved with the system, some have expressed concern that something is bound to show signs of weakness. At the time of this writing however, there have been no obvious weak points in the ACD system. See Section III - G
6) Where is the ACD?
- The ACD clutch pack is located inside the transfercase, the center differential itself is located inside the transmission and the ECU is located to the right of the glove box. See Section II – B
7) What controls the ACD?
- The ACD ECU reads several sensors that control the limited slip action of the center differential. The Tarmac/Gravel/Snow button further determines is actions. See Section II – B
8) What models have the ACD?
- All 2005 Evo VIII’s and all 2006 Evo IX’s. See Section II – A
9) Is the ACD just a LSD (Limited Slip Differential)?
- Basically, yes. It’s a computer controlled LSD. See Section II – B
10) Can I put any downpipe I want on my ACD equipped Evo?
- No. Before you purchase one, ask the manufacturer or vendor if it clears an ACD equipped Evo. See Section III - B
11) Which downpipes CAN I put on my ACD equipped Evo?
- Many different kinds. Most manufacturers have fixed the downpipe fitment issues with ACD equipped Evo’s, but not all. Eventually this guide will have a list, but in the mean time, ask the vendor you buy from. See Section III - B
12) Do All Upper Intercooler Pipes work with ACD equipped Evo’s?
- Possibly. There have been reports of some UICP’s having minor fitment issues. Again, ask your vendor if it will fit. See Section III - E
13) Which UICP work with ACD equipped Evo’s?
- Just like the downpipes, this guide will eventually have a list, but in the mean time, just ask your vendor. See Section III - E
14) All of my ACD lights are on. What does this mean?
- It means your ACD is experiencing a fault and it needs to be serviced. Take it to a dealership. See Section III - D
15) Can I just service the ACD myself?
- The ACD requires a special tool from Mitsubishi to engage the ACD pump. This is a very expensive piece to purchase. For most people, it would be wiser to just take it to the dealership to service. See Section III - D
16) Why doesn’t my model come with the ACD?
- Because Mitsubishi didn’t want it to. Sucks for you. See Section II - A
17) Why didn't the USDM Evo's get equiped with the ACD & AYC like everyone else?
- It is believed that the reason our Evos don't come with the full AYC & ACD combo is because the AYC equipment goes into the same place that the US emissions regulations equipment goes. That's why the US VIII and IX will not see the full AYC/ACD package. The emissions equipment is all the stuff hanging next to the fuel tank under the driver's side of the car. See "Evaporative emission canister and fuel tank pressure relief valve" as shown on page 17-21 in the service manual. (18)
**************************
http://forums.evolutionm.net/showpost.php?...amp;postcount=5