AYC Issue/Confusion

Discussion in 'Engine, Transmission and Drivetrain' started by Rowie94, Sep 4, 2018.

  1. Rowie94

    Rowie94 Hesitantly Boosting Lifetime Member

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    So, after my car came back from insurance repair, I noticed that the AYC was being very loud going around slow tight corners, like roundabouts. It seemed to squeak like a squidgee on a window on right hand turns, and creak and clunk on left hand turns. Using the guide here, I change the fluids inside the diff and AYC reservoir (GL5 and SP3 respectively) to see if it would make a difference.
    Well, yes and no. At first, it still kept making exactly the same noises, and even going around a roundabout made the AYC gauge light up like a christmas tree.
    Then the little red AYC light came on, my christmas tree went totally dark, and there were strange sounds no more.

    What does this all mean? Did the diff realise that it was fucked so it just turned off the AYC system and is functioning as an open diff? And should I start looking for a new one?
     
  2. LDundon

    LDundon Violent Violet Lifetime Member

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    Sounds like the pump is stuffed mate. Was it due to the service? Or just happened to happen at the same time? Did they service the rear diff for you? Maybe they used the wrong fluids? Possibly just by chance... it might mean the diff itself is stuffed, but sounds like just the pump.
     
  3. Rowie94

    Rowie94 Hesitantly Boosting Lifetime Member

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    It wasn't a service, it was an insurance repair from a failed theft attempt. They wouldn't have touched the diff. Fluids were changed by Sam before I bought it. Is the pump a big deal? Is it expensive or hard to change?
     
  4. LDundon

    LDundon Violent Violet Lifetime Member

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    Pump isn’t to bad to replace from my understanding, although I am well known for preaching just putting an LSD rear diff in and getting rid of the AYC all together. I have an LSD and I prefer it to the AYC personally and means I don’t need the pump anymore
     
  5. Rowie94

    Rowie94 Hesitantly Boosting Lifetime Member

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    That's the direction I'm honestly considering. Just so I'd never need to worry about it again, and I am simply not an aggressive enough driver for AYC to make a difference for me. Do you have any pointers for finding a decent one?
     
  6. LDundon

    LDundon Violent Violet Lifetime Member

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    If you’re not an aggressive driver you probably don’t want to go down the track of an LSD... as they’re honestly better suited at aggressive driving. plus there’s plenty of second hand AYC’s and pumps around.
     
  7. Rowie94

    Rowie94 Hesitantly Boosting Lifetime Member

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    It's more like... I'm sick of worrying about the diff. I feel like I would never worry about the LSD again.
     
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  8. naughtika

    naughtika OzVR4 Stalker Moderator Trader

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    I suggest you get s-ayc or ayc from evo 7 or 8 ad they are much stronger than ours.

    Also, from the pic you posted in the fb page, it needs a good servicing

    Also open diff part uses GL-4 from memory and not gl-5 just in case this is what you used as replacement
     
  9. Gav

    Gav 1 AYC Bar Lifetime Member

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    You want a sayc from the Evo 8-9 or go the lsd option.
    You don’t want the Evo 7 diff
     
  10. Rowie94

    Rowie94 Hesitantly Boosting Lifetime Member

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    I hope it's GL5, because that's what I just put on it. 75-90 syntrax just like inn Macca's guide.

    Screenshot_20180905-122142_Samsung Internet.jpg
     
  11. naughtika

    naughtika OzVR4 Stalker Moderator Trader

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    What's with the evo 7 ayc?
     
  12. Gav

    Gav 1 AYC Bar Lifetime Member

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    They are just a plain ayc. Not as strong as the S-ayc that’s in the Evo 8-9’s.
     
  13. TME_Steve

    TME_Steve 3 AYC Bars Trader

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    Evo 4-6.5 have the same ayc diff as vr4.
    Evo 7 has a stronger version of that diff.
    Evo 8-9 super ayc runs a torsen LSD in addition to the ayc clutch packs to increase torque transfer. They are stronger again in the housing and have the same stronger crown wheel and pinion.
    Evo X is similar to 8/9 but will not fit a vr4 without a new centre despite a thread on here saying they 'machined' something inside the diff. They did not. They put a vr4 diff centre into the Evo X housing making it an ayc diff without the LSD of the Super. It would still be stronger than the regular ayc though. I know this as we just did one but we used an sayc diff centre from an Evo 9. Lucky I had one....
    VR4s seem to eat rear diffs, far more than evo's, maybe the extra weight, maybe the open front diff means more torque goes to the rear, who knows. But in evo's, ayc are usually good for 250awkw, sayc mid 300kw at least, but there are also evo's running 10s with 500+kW and stock sayc diffs. We also have strengthening options for sayc....
    As you all know I'm really a fan of sayc and ayc to a lesser extent. I feel that moving to open or viscous or plated LSD is a backward step and you lose something from the car. They do slide easier but then so do commodores
     
    GT-Pete, jungle, pretzil and 3 others like this.

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