Cusco lsd in ayc housing

Shax · 14-01-2021, 14:27

Hey! I'm trying to post this thread for a second time, I got banned on my first account on here in the attempt of posting my first thread, reason; spamming? Makes no sense, I tried to get in touch with the webmaster to have my original account unbanned, since it most have been a mistake, I read the rules beforehand, twice now, still can't make sense of my ban, ANYWAYS!

My car is a EVO 5 with AYC.

The Reason I came on here were to look for advice on how to mount a CUSCO LSD in a AYC housing. My thread from yesterday was more thorough, but essentially I linked to another thread on here where someone had done this but they removed all the AYC components inside the diff, I've come to the conclusion that I most likely wont do that, since there is a risk of the misalignment from what I've read, and a lot of hassle to get it to work without the AYC parts in place.

So my option right now is, only remove the mechanical diff, and replace it with the CUSCO, which I need to press new bearings on.
Are these the right bearings?
https://mitsubishi.epc-data.com/lanc...154041,154042/

And can I simply "plug" the ayc lines into the diff? And drain the AYC part of oil completely?

I appreciate all help,
Thanks a lot!

grants · 14-01-2021, 16:31

Forget anything you thought about fitting a LSD into AYC housing. It is not viable £/time

Find an RS diff kit which includes mountings and drive shafts/

Your Cusco diff may have a s/h value

kikiturbo · 14-01-2021, 16:44

The question is, which cusco it is...
Those bearings will not fit the ayc case.

I second the converting to RS diff idea.. BTW..

Shax · 14-01-2021, 17:05

Oh damn, is it that expensive? The RS kit where I live is 2500£, Cusco is diff 600£.

Also, what would the process be? Not sure of the model of Cusco yet

kikiturbo · 14-01-2021, 17:13

there is a cusco diff that is a drop in replacement and goes into the ayc housing.. ocmes with the bearings..

https://www.4turbo.pl/cusco-metal-ls...,3,48643,29661

I have no idea which cusco diff you can get for 600

As for bearings.. one of the ayc bearings is not available anymore... the other one is a standard bearing which you can get anywhere... You can reuse the old bearing...

kikiturbo · 14-01-2021, 17:14

Frankly speaking.. nothing wrong with the ayc diff..

Shax · 14-01-2021, 20:16

Quote:

Originally Posted by kikiturbo

there is a cusco diff that is a drop in replacement and goes into the ayc housing.. ocmes with the bearings..

https://www.4turbo.pl/cusco-metal-ls...,3,48643,29661

I have no idea which cusco diff you can get for 600

As for bearings.. one of the ayc bearings is not available anymore... the other one is a standard bearing which you can get anywhere... You can reuse the old bearing...

Oh yeah it's the one you linked from 4turbo.pl, it's used, but barely. The guy that had it wrecked his car just after installing it.

Also, nothing wrong with the AYC system, but the solenoids in my ayc pumped broke off inside the pump body. I have to get new solenoids and rebuild the pump, not sure what else might break during the process so I opted for the cusco diff. What would you guys have done? You still think it's cheaper to repair the pump than installing the cusco drop in?

Should only be to. Drop in the new cusco diff, check backlash etc.., good to go? Maybe plug the ayc wholes?

Arronevo8 · 14-01-2021, 20:38

It's the casing that's the weakness and it's bloody heavy. It works ok though.

alpinaturbo · 14-01-2021, 21:57

I think AYC is fabulous, and Cusco may have it's place but somehow it seems wasted on AYC housing.

Cusco would be for race-car that gets abused and you want to setup diffs, after you have exhausted all other areas of potential improvement.

Starting at the AYC..with Cusco..is working backwards and out of synch.

If anything, upgrade to Evo 8/9 SuperAYC, to get more torque transfer.
That is positive direction and plug n play solution.

RS diff is fine, but why? AYC in road car is nicer, RS will introduce understeer if plates are setup to give aggressive lock. It will drive worse, unless again..you drift through every corner, which is only viable in racecar.

Tyrone6 · 15-01-2021, 10:31

i looked at doing the ayc diff conversion with cusco diff and theres a bearing that the diff dose not come with. and its hard to find i could only get one from the usa and cost about 250+. the diff + fitting and set up. better off a RS diff set up that what i did got a kit under 2k

Madmac · 15-01-2021, 13:51

The clutch plates add substantial drag to the unit and are best removed. The casings also break away at the bearing towards the middle of the casing, especially the Evo 4/5/6 casings. The later casing is stronger at that point but still much weaker than an RS diff. One launch could see the casing break. If you take the clutch plates out you can add a strengthener as per this thread: https://www.lancerregister.com/showt...+strengthening which will remove the chance of the bearing support breaking away.

Clivew · 21-01-2021, 18:27

All the talk of weak cases etc is pointless.

The AYC Cusco diff no longer comes with the inner bearing which you need, and which is a different size to the standard inner bearing. This bearing was specially made for Mitsubishi, is no longer available, thus why Cusco don't supply this bearing with the diff for AYC install anymore. Good luck finding one!!

14-01-2021, 14:27	#1
Shax Registered User Join Date: Jan 2021 Posts: 3	Cusco lsd in ayc housing Hey! I'm trying to post this thread for a second time, I got banned on my first account on here in the attempt of posting my first thread, reason; spamming? Makes no sense, I tried to get in touch with the webmaster to have my original account unbanned, since it most have been a mistake, I read the rules beforehand, twice now, still can't make sense of my ban, ANYWAYS! My car is a EVO 5 with AYC. The Reason I came on here were to look for advice on how to mount a CUSCO LSD in a AYC housing. My thread from yesterday was more thorough, but essentially I linked to another thread on here where someone had done this but they removed all the AYC components inside the diff, I've come to the conclusion that I most likely wont do that, since there is a risk of the misalignment from what I've read, and a lot of hassle to get it to work without the AYC parts in place. So my option right now is, only remove the mechanical diff, and replace it with the CUSCO, which I need to press new bearings on. Are these the right bearings? https://mitsubishi.epc-data.com/lanc...154041,154042/ And can I simply "plug" the ayc lines into the diff? And drain the AYC part of oil completely? I appreciate all help, Thanks a lot!

14-01-2021, 16:44	#3
kikiturbo Senior User Join Date: Feb 2008 Location: Croatia Car: EVO 9 GSR Posts: 2,798	The question is, which cusco it is... Those bearings will not fit the ayc case. I second the converting to RS diff idea.. BTW.. __________________ ACD/AYC pump repair video To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

14-01-2021, 17:05	#4
Shax Registered User Join Date: Jan 2021 Posts: 3	Oh damn, is it that expensive? The RS kit where I live is 2500£, Cusco is diff 600£. Also, what would the process be? Not sure of the model of Cusco yet Last edited by Shax; 14-01-2021 at 17:06..

14-01-2021, 17:13	#5
kikiturbo Senior User Join Date: Feb 2008 Location: Croatia Car: EVO 9 GSR Posts: 2,798	there is a cusco diff that is a drop in replacement and goes into the ayc housing.. ocmes with the bearings.. https://www.4turbo.pl/cusco-metal-ls...,3,48643,29661 I have no idea which cusco diff you can get for 600 As for bearings.. one of the ayc bearings is not available anymore... the other one is a standard bearing which you can get anywhere... You can reuse the old bearing... __________________ ACD/AYC pump repair video To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

14-01-2021, 17:14	#6
kikiturbo Senior User Join Date: Feb 2008 Location: Croatia Car: EVO 9 GSR Posts: 2,798	Frankly speaking.. nothing wrong with the ayc diff.. __________________ ACD/AYC pump repair video To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

14-01-2021, 16:31	#2
grants Senior User Join Date: Sep 2003 Posts: 9,743	Forget anything you thought about fitting a LSD into AYC housing. It is not viable £/time Find an RS diff kit which includes mountings and drive shafts/ Your Cusco diff may have a s/h value

14-01-2021, 20:38	#8
Arronevo8 Senior User Join Date: Sep 2010 Location: N/ireland ballykelly Car: Std vi imported january 12 mint and very nice in white Posts: 3,948	It's the casing that's the weakness and it's bloody heavy. It works ok though.

14-01-2021, 21:57	#9
alpinaturbo Senior User Join Date: Jan 2009 Posts: 921	I think AYC is fabulous, and Cusco may have it's place but somehow it seems wasted on AYC housing. Cusco would be for race-car that gets abused and you want to setup diffs, after you have exhausted all other areas of potential improvement. Starting at the AYC..with Cusco..is working backwards and out of synch. If anything, upgrade to Evo 8/9 SuperAYC, to get more torque transfer. That is positive direction and plug n play solution. RS diff is fine, but why? AYC in road car is nicer, RS will introduce understeer if plates are setup to give aggressive lock. It will drive worse, unless again..you drift through every corner, which is only viable in racecar.

15-01-2021, 10:31	#10
Tyrone6 Senior User Join Date: Jan 2016 Location: Bourmouth Car: Evo 6 GSR Toyota Glanza V X2 Posts: 170	i looked at doing the ayc diff conversion with cusco diff and theres a bearing that the diff dose not come with. and its hard to find i could only get one from the usa and cost about 250+. the diff + fitting and set up. better off a RS diff set up that what i did got a kit under 2k

15-01-2021, 13:51	#11
Madmac Twincharger Guru Join Date: May 2003 Location: Stonehaven, Aberdeenshire Car: Evo 5 850hp Hillclimb twincharger & Manual Legnum VR4 Type S Posts: 4,544	The clutch plates add substantial drag to the unit and are best removed. The casings also break away at the bearing towards the middle of the casing, especially the Evo 4/5/6 casings. The later casing is stronger at that point but still much weaker than an RS diff. One launch could see the casing break. If you take the clutch plates out you can add a strengthener as per this thread: https://www.lancerregister.com/showt...+strengthening which will remove the chance of the bearing support breaking away. __________________ "Understeer" is when you hit the fence with the front of the car. "Oversteer" is when you hit the fence with the rear of the car. "Horsepower" is how fast you hit the fence. "Torque" is how far you take the fence with you.

21-01-2021, 18:27	#12
Clivew Transmission Dynamics Join Date: Feb 2001 Location: Bedford Car: Highly Modded E6 T04Z/2.2ltr, Tesla Model 3 Performance, Renaultsport Megane RS250 Cup. Posts: 7,800	All the talk of weak cases etc is pointless. The AYC Cusco diff no longer comes with the inner bearing which you need, and which is a different size to the standard inner bearing. This bearing was specially made for Mitsubishi, is no longer available, thus why Cusco don't supply this bearing with the diff for AYC install anymore. Good luck finding one!! __________________ To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts. 'There is no worse bitterness than to reach the end of your life and realise you have not lived'

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