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Sanctifier
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Joined: 07 Apr 2005
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Location: Good question!
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 Posted: Sun Oct 02, 2005 11:11 am Post subject: Active Yaw Control Maintenance - "How-To" Guide |
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Does your Evo "squeak" when going around a corner, or when reversing and turning?
Have you ever noticed that your Evo "fishtails" (often violently) when pushed hard in a corner?...
... and there was nothing you could do about it?...
... Even more "opposite lock" didn't help... It often made it worse??
Here's the answer... and if you ever noticed any of the above you better do the following NOW!
Does every Evo-owner regularly replace the fluid in the rear AYC differential?
Have some of you Evo-owners ever replaced the AYC fluid?
In earlier versions (Evo 4 to 6 GSR's) the AYC fluid was supposed to be changed
every 4,500 miles according to the Workshop Manual.
"It has been suggested that Mitsubishi may extend this service interval for the AYC
to 18,000 miles at a later date." - MLR
BTW failure to do this regularly will lead to premature wear, noisy daily use
and IMO maybe dangerous operation.
But how do you really service them and change the fluid???...
The simplest method is to take it to the Dealer and let them use their MUT II/III diagnostic unit.
This communicates with the AYC's ECU (behind the front dashboard/console) to open and
close the AYC pump's valves in the correct sequence to eliminate "air-bubbles" and ensure
trouble-free (squeakless) use.
There's only one small problem... The Dealer does not service "foreign used" (R.O.R.O) cars.
A manual method is available and it's possible to "Do-it-Yourself"...
if you know what you're doing... Now you do!...
OEM "How-To" Guide - Active Yaw Control Differential Maintenance
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Okayyy!... Now how many of you do all that again???
Humm!... I think I'll definately stick with my RS's rear LSD instead, thank you very much! 
Comments and suggestions please. 
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Walk softly... and carry a BIG stick! 
Last edited by Sanctifier on Sun May 15, 2011 4:29 am; edited 1 time in total |
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crazybaldhead
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Joined: 12 Jan 2006
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| Posted: Fri Jan 20, 2006 10:09 am Post subject: |
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All that sounding like real stress dread.
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haywire
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Joined: 29 Apr 2006
Posts: 6
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| Posted: Sat Apr 29, 2006 8:59 pm Post subject: |
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Hello Sanctifier ! What are the specs for the OEM ayc fluid or what would be a good alternative?
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Sanctifier
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Joined: 07 Apr 2005
Posts: 1794
Location: Good question!
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| Posted: Sun Apr 30, 2006 5:39 am Post subject: |
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| haywire wrote: | | Hello Sanctifier ! What are the specs for the OEM ayc fluid or what would be a good alternative? |
This is the data for the Evo 4-6:
As far as substitute fluid, I don't know. It looks like good old...
Heavy duty Hypoid Gear-oil (API GL-5 or better) for the differential - '90' body or '80W'.
Automatic Transmission Fluid (ATF SPII specs) for the Hydraulic system. *
and Vaseline for the "Oil-seal lips" ...
Never heard of specific "AYC Fluid" it may be the same ATF used in the system. (see above*.)
To be sure, register (free) with Mitsubishi Lancer Register (UK) and post a question in
relevant Tech section or General forum.
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haywire
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| Posted: Sun Apr 30, 2006 8:18 am Post subject: |
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Thanks!
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Sanctifier
Zorce Moderator
Joined: 07 Apr 2005
Posts: 1794
Location: Good question!
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| Posted: Mon Aug 02, 2010 12:17 am Post subject: |
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UPDATE: Evo I - Evo X AYC oil recommendations, 2010...
| CoOrdSport wrote: | Evo Gear/LSD Oil Recommendations
We’re always getting asked which oils and how much to use in Evo’s. Our sister company X-treme UK, who are a high performance vehicle specialist based in the West Midlands, recommend the following:
Lubricant quantities as follows:
5 and 6 speed gearboxes: approx 3 litres of oil (this feeds front diff. part of transfer box, as they are inter-connected)
Transfer box: approx 0.6 litres of oil (this oil is for the transfer gear CWP)
Rear diff: approx 1 litre of oil
AYC hydraulics and reservoir: approx 1.5 litres of oil
Oils that Xtreme use/alternatives:
GEARBOX Oils
5 speed gearboxes – Castrol Syntrax 75/90semi synthetic/Cusco 75w-85
(with plated LSD fitted at front, use Cusco / KAAZ 80w-90)
Competition gears, especially dog-type gears – Cusco / KAAZ 80w-90
6 speed gearboxes – Castrol SMX-S 75/85fully synthetic or Cusco 75w-85
TRANSFER BOX Oils
Transfer box Evo 5/6 - Castrol Syntrax 75w-90
Transfer box Evo 7~9 – Castrol LS (LSD oil)
Special Note – some tuners/gear specialists, such as ShepTrans, strongly recommend the MMC official oil Diaqueen LSD Oil SAE 90 or for extreme use Motul PA90, but that Diaqueen is not readily available in the UK, Mitsi Dealers use Morris XEP80W/90 LSD Oil
Rear Diffs
GSR Rear diff (diff.section of AYC type – all GSR) – Castrol Syntrax75w-90 or Cusco / KAAZ 80w-90)
RS Rear diff (all RS, RS2, GT) – Castrol LS or: Cusco / KAAZ 80w-90 or Cusco 80w-140
AYC system
MMC Diaqueen only
SST Transmission – Evo X, R35 GTR, etc.
(these semi-automatic DSG type gearboxes need very special oils, as they are very susceptible to problems, especially when hot).
The normal recommendation for Evo X by MMC UK is SST F1 Diaqueen (when available)
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FYI... X-treme UK is the name of that old  tuning firm called... RalliArt 
RalliArt's $0.02¢
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