Truth Squad: Strenght Of ACD DIFF
Originally Posted by Juiced
I totally agree with the statement that when electronics are introduced to control mechanisms that work almost perfect on their own it reduces reliability and longevity.
at least I'm not the only one....
Originally Posted by Juiced
(side note) Hey Hatch what to you specialize in engineering?
- Steve
Thread Starter
Evolving Member
Joined: Aug 2005
Posts: 450
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From: SO CAL
I'm not talking about abusing the car, I'm talking about driving it hard and making power.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
Thats awesome,
When i first started out i applied and got offered a job at lockheed martin but it wasn't what i was looking for specially since i knew i would never get to test any of the products.
Now i work for a small firm (with some DOD work) that works on Hi capacity Electric motors (we have the first electric 3 rotor motor), and alternative fuel internal combustion engines.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
Thats awesome,
When i first started out i applied and got offered a job at lockheed martin but it wasn't what i was looking for specially since i knew i would never get to test any of the products.
Now i work for a small firm (with some DOD work) that works on Hi capacity Electric motors (we have the first electric 3 rotor motor), and alternative fuel internal combustion engines.
Last edited by Juiced; Dec 6, 2005 at 03:28 PM.
Originally Posted by SuperHatch
On topic...
I only see one problem with whether the ACD will hold the power or not. The torque at the Center Diff could overwhelm the clamping pressure of the ACD's Elecrohydraulic Clutch Pack. I do not know how the ACD works, but if it gives everyone a warm fuzzy I'll get the schematics out and disect it myself and figure it out.
If the system works as I envision it, a simple revalving of the hydraulic portion may increase line pressure and in turn increase the clamping pressure of the ACD. This will be detrimental to the behavior of the ACD in daily driving, but it will allow it to hold a greater torque load in a drag race situation. This is a similar approach to the revalving of an automatic transmission.
- Steve
I only see one problem with whether the ACD will hold the power or not. The torque at the Center Diff could overwhelm the clamping pressure of the ACD's Elecrohydraulic Clutch Pack. I do not know how the ACD works, but if it gives everyone a warm fuzzy I'll get the schematics out and disect it myself and figure it out.
If the system works as I envision it, a simple revalving of the hydraulic portion may increase line pressure and in turn increase the clamping pressure of the ACD. This will be detrimental to the behavior of the ACD in daily driving, but it will allow it to hold a greater torque load in a drag race situation. This is a similar approach to the revalving of an automatic transmission.
- Steve
Keith
Originally Posted by Juiced
I'm not talking about abusing the car, I'm talking about driving it hard and making power.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
Originally Posted by SuperHatch
http://www.z1auto.com/prodmore.asp?m...ine&prodid=133
"Does not work on US Spec Evos"
Anyone know why?
- Steve
"Does not work on US Spec Evos"
Anyone know why?
- Steve
Keith
one of the reasons i thought the jdm acd ecu's would not work would be due to a different coding than the us spec. not suer im correct in this statement but it would kinda make sense when the acd ecu is trying to communicate with the main ecu to recieve information from sensors. let me know if im on track with this or not
Originally Posted by Juiced
I'm not talking about abusing the car, I'm talking about driving it hard and making power.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
Any dumbass can dump the clutch on a car and grenade the drive train, i'm more concerned with high speed runs or long roadcoarse straights were high tq for prolonged time might cause the clutch plates to fail.
On a long strait the front and rear wheels WANT to turn at the same speed, especially with the downforce of the wing putting more load on the rear wheels somewhat making up for the static forward weight bias of the car. In a situation like that the EVO puts very little stress on the center diff and clutch packs. It is when you have a high potential for different speeds between the front and rear and the ACD tries to make them spin at the same speed that you are loading it up and putting a lot of stress on it.
Keith
Originally Posted by Fourdoor
From the reading I have done seems to indicate that the ACD locks up hard compared to the VCU used in the 03/04 EVO's (in tarmac mode) and the ACD mimics the VCU close when in snow mode. That would seem to indicate that it will put more stress on the spider gears than an older EVO. I am not sure what effect the helical limited slip will have on the stress level on the rest of the drivetrain.
Keith
Keith
- Steve
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Joined: Dec 2005
Posts: 23
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From: Miami DSM
I believe TRE has an option to build a transfer case with 4 spyder gears instead of 2, atleast for the DSM's.
For those of you wanting the strongest DIF available, simple weld your venter diff, there, now your weakness will transfer to your axl's hehe.
For those of you wanting the strongest DIF available, simple weld your venter diff, there, now your weakness will transfer to your axl's hehe.
Originally Posted by Miami DSM
I believe TRE has an option to build a transfer case with 4 spyder gears instead of 2, atleast for the DSM's.
For those of you wanting the strongest DIF available, simple weld your venter diff, there, now your weakness will transfer to your axl's hehe.
For those of you wanting the strongest DIF available, simple weld your venter diff, there, now your weakness will transfer to your axl's hehe.
Yes, you could weld the center diff if you decided you didn't want to turn anymore.
- Steve
not sure why you guys have such doubts on the ACD. in general a multiplate design is very strong. if anything the point of failure would be something electrical in nature... which is just the luck of the draw in terms of whos going to break and who doesn't.
so far the 05's have for sure had less tranny issues than the 04' and 03'.
so far the 05's have for sure had less tranny issues than the 04' and 03'.
Originally Posted by propellerhead
Somewhere on EvoM someone photochopped a factory diagram that showed the transfer of power between the two parts. I'll see if I can find it.
Look halfway down on this page at the post I made. It shows some actual drivetrain components photoshopped together.
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