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Thread: My Q4

  1. #76
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    nice work J.
    looks like you had to move a few things to get that inlet to fit!

  2. #77
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    Great job!

  3. #78
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    I have just broken my rear diff

    Do you guys know for sure, what other cars are equipped with the same diff (lancia/fiat etc ... )

    Also, do you know what could possibly be the cause of the failure. My car is far from being very powerful (no more than 270 hp I guess)

  4. #79
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    Bad luck! I am not certain for sure which cars share it...sure someone will though.

    Perhaps it leaking the oil and seized and broke?

  5. #80
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    I have found a used q4 diff, thanks. Hopefully this one will not brake.

  6. #81
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    That was quick! Dont know where I would begin looking!

  7. #82
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    Quote Originally Posted by AlfaJack View Post
    That was quick! Dont know where I would begin looking!
    Yes, I was pretty lucky this time. Found it in a big junk yard, that has a lot of stuff. Had to travel 300km however to pick it up.

  8. #83
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    it broke again

    I need hints, what could be the cause. Material fatigue ? What do you guys think, have anybody here had similar problems ?

    also I'm in a desperate need of a diff. Some gears would help me too, if you have a broken diff laying around.

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    Something is not right at the back to break two diffs! Will have a think...

  10. #85
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    Prop out of balance???

    Dunno...

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  11. #86
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    Is there much vibration from the car you think when driving?

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    I think the Dedra Integrale's is the same, don't know about Bulgaria, but here there's a whole bunch of them for low price, as opposed to Alfas.

    My guess would be that there's something wrong with the torque distribution. Did you, by any chance, drive the car without the prop-shaft on?

  13. #88
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    there was vibration yes ...

    a have not driven the car without prop, however I had to pull it once for over 130km with the prop disconnected (the car rolling on its rear wheels)

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    Can you post up some pics? It's no good just guessing without seeing what the diff looks like from the outside and what damage has occured (presumably) internally

  15. #90
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    1st - sorry for my english

    Inside the diff it's the torsen part that brakes - the small helical gears in it. they are like cut in the middle with a knife. I will try to make some pics of the broken parts.

  16. #91
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    one more thing. I saw on the eper that the price for a new 156 Q4 rear torsen (the torsen part only) is not quite expensive (~250 euros)

    Does anybody have any details about it ?

  17. #92
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    Disregard my comment about driving without the propshaft, that could hurt the central diff I think...

    I'll have to read more carefully next time, sorry.

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    Wink

    Quote Originally Posted by veki View Post
    Disregard my comment about driving without the propshaft, that could hurt the central diff I think...

    I'll have to read more carefully next time, sorry.
    Quote Originally Posted by j1v View Post
    1st - sorry for my english

    Inside the diff it's the torsen part that brakes - the small helical gears in it. they are like cut in the middle with a knife. I will try to make some pics of the broken parts.

    Don't worry about your English, for sure it's better then my Bulgarian.

    I wanted to know if your diff was like an integrales, I doubt it is as they are pretty bombproof.
    How are you breaking it? Are you launching the car suddenly like in a drag race? This is what breaks transmissions, not outright power at these levels.

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    I launch carefully. Especially with the second diff, I was very careful, actually it almost haven't been launched at all. There where however vibrations form the rear of the car with it.
    We were not able to open it prior to putting it on the car, because of the "warranty" they gave me. It was sealed and I had a couple of days money back warranty if it was not in good condition. We only changed the oil in it and put it on the car. I will for sure not want a warranty diff next time

  20. #95
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    I just bought a dedra rear diff. It is an open diff with el. blocking via a solenoid. The housing is almost the same, and it fits without any modifications.
    I drove it for a test, and its OK. Haven't tried it on a track or launch however.
    Later I will probably try to connect the blocking device somehow (it works needs vacuum and some kind of control of the solenoid)

    If someone has more info on it, please let me know.

    Meanwhile, I sound dampened the hole car, replaced everything on the brake system and installed new seats. I have to say it became a different car. Will post pics later. Time for bigger injectors, 3 bar MAP and some serious tuning finally ....

  21. #96
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  22. #97
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    I'm assuming its not finished yet, and are you going to be fitting an external wastegate? That first pic looks like you have closed off the one in the turbo itself.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
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    1994 Alfa Romeo 155 , 1995cc Std Standard Black

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    Quote Originally Posted by Steve Webb View Post
    I'm assuming its not finished yet, and are you going to be fitting an external wastegate? That first pic looks like you have closed off the one in the turbo itself.
    absolutely right

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  25. #100
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    Great work going on there. Can you tell us what are your plans for the car, are you using it on the street or just on the track. ps.. nice welding.

    JimN~

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