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  1. #1
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    Default Front ARB thickness

    found a ARB from a dedra integrale at last (24mm). I now need to kvow the thickness of the original alfa 155 Q4 front ARB so I?m sure to get the right one

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    I can measure it later on as my car is up on axle stands at the moment.

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    I thought the Q4 ARB was 22mm, I've got a dedra ARB one on my car as its a quick and easy upgrade.

    Fit a strut brace and Dedra integrale ARB and the front end of the car feels much more positive.

    Steve
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

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    narrow body is 23mm and wide body is 22mm. Just measured both.
    1 or 2 mm of difference wont give you such an improvement, I believe.

    @ Steve
    which is the dia from the front ARB you use? Are all the Grale's ARB {16V - Evo1 - Evo2} with the same dia?

    Nick

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    Remember that the stiffness of the ARB is going to depend on the cross sectional area, so seemingly small increases in diameter are going to cause larger % increases in stiffness.

    22mm diameter cross section = 22/7 * 22? (pi x r?) = 1520mm?

    24mm diameter = 22/7 * 24? = 1810mm?

    1810/1520 = 1.19

    The 24mm diameter ARB offers an approx 20% increase in stiffness over the 22mm ARB

    A little simplified but thats the general gist of it.

    And the 24mm ARB is from a Dedra Integrale not a Delta Integrale.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

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    Thanks Steve,

    is the Dedra's Integrale front ARB a direct replacement?

    Nick

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    Quote Originally Posted by Steve Webb View Post
    And the 24mm ARB is from a Dedra Integrale not a Delta Integrale.
    Interesting....unfortunately not many (if any!) of those in the UK

    wrinx
    My Q4 in the Garage

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

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    Eibachs and whiteline are *really* stiff so you should be doing just fine with 26mm. Be aware that the balance between front and rear (over- and understeer) is partially controlled with the balance between the ARBs. If you put a stiffer rear ARB on, you'll get more grip on the front and vice versa. Just changing the front will make the car even more going into oversteer than it does now, so you might want to make some different sizes for the rear to get the balance right. (I'm assuming the rear ARB is more easy to swap out here)

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    I have now given up having made a custom front ARB so I am going to use the one from an dedra Integrale.
    Q: the weelbase of the widebody is 2 cm longer than my narrowbody. how can I be sure that the arb from the dedra fits?

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    all suspension parts are shared between the widebody and narrowbody cars, the difference in trackwidth is due to a different offset on the wheels (ET = Einpress Tiefe or something very similar), the arbs excepted and possibly dampers excepted. But even those are interchangeable.

    The wheelbase is the same for all 155's IMO, 100" or 2.54m

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    Yes, as far as I know the extra track is just the wheel offset and 5mm spacers!

    wrinx
    My Q4 in the Garage

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

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    Suspension arms at the back definitaly not interchangable between sb and wb!
    I once damaged one and the one i bought turned out to be a sb one.

    wich is shorter... So the rear wheel came very much inside on the botom part.
    155 Q4 wb 1995
    S2000 2005
    V70R 2005

    www.alfa155club.nl

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    Quote Originally Posted by wrinx View Post
    Yes, as far as I know the extra track is just the wheel offset and 5mm spacers!

    wrinx
    saying this, the 5mm spacers, you answered a question I always wanted to ask!
    Do you know if there were spacers at the wb's front wheels too and how many mm?

    Nick

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    well, whaddaya know... did the arb fit the sb arm?

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    Quote Originally Posted by cuore_sportivo_155 View Post
    well, whaddaya know... did the arb fit the sb arm?
    Not sure if this has to be removed.

    Everything was fitted before i saw the car.
    Including arb i guess.

    The wheel offset made the mechanics look kinda silly.
    The car was lifted on the bridge because putting force on the wheel like that was not a good idea.
    155 Q4 wb 1995
    S2000 2005
    V70R 2005

    www.alfa155club.nl

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    Sorry, I was only talking about the front wheels...they were definitely fitted with 5mm spacers from the factory, in fact they can still be bought from Alfa.

    Rear wheels are a bit unknown...some reports that cars had spacers on all four wheels, some say not.

    wrinx
    My Q4 in the Garage

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

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    On mine are missing both front and rear and with Speedline rims is quite ugly - mostly for the rear wheels.

    Nick.

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