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    Default Longer 5th gear - Q4 gearbox

    Hi Guys

    Dave - did you find anywhere cheaper? I am keen to do this whilst the box is out of my car at the moment.

    I am surprised more people havent done this? My car is standard and still has more power than it does gears, anyone with more power must have deft throttle control in order to cruise at motorway speeds.

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    Buy a 16vt 'box and remove the bits you need.
    The ratios are certainly much taller so you'll have worse acceleration, but better cruise. I've seen 120mph in 3rd and 160 in 5th.

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    Quote Originally Posted by Evodelta View Post
    I've seen 120mph in 3rd and 160 in 5th.
    Thats an awfully long straight on that private track!
    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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    It was yes. The car wanted to go more and had it in it too - I didn't though, I was crapping myself.

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    I had a moment like that once, it was in my old Fiat 500 with the hot 126 engine. There was plenty of go left in the car, but it was going fast enough for me thank you very much.
    75mph in a car designed in the 50s for Italian country lanes get pretty scary!
    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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    Hi Evodelta. When you say 16vt box would a coupe one work? If not from what? I only want to change 5th and I know that'll leave me with a fairly big drop in rpm between 4th and 5th but I might be able to get around without having to buy a fuel refinery!! Thanks

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    Yes, I do mean Coupe 16vt. You would have to open one up to see what is what, but both stacks are very similar so some gears could be usable. It is probably the diff (not interchangeable) which gives the Coupe its overall higher gearing.

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    Today I order these gears from an Alfa Romeo dealer for 360 euros both. I hope the codes are correct.

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    Quote Originally Posted by Alfa Patch View Post
    Hi Guys

    Dave - did you find anywhere cheaper? I am keen to do this whilst the box is out of my car at the moment.
    Hi

    I have not come around to order these yet, have so many things on the to-do-list that the money seems to run straight through my wallet
    and this is not a high priority right now..
    anyone else found a better price somewhere?

    Steve maybe this would be an item for the Shop, it is a good (and easy) mod and as Alfa Patch says, even standard the car revs a bit too high on highway-speeds!?
    best regards

    David
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    Alfa Romeo 155 Q4 -93 Nero "BTCC"
    Alfa Romeo 155 Q4 -94 Rosso

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    Quote Originally Posted by Evodelta View Post
    Yes, I do mean Coupe 16vt. You would have to open one up to see what is what, but both stacks are very similar so some gears could be usable. It is probably the diff (not interchangeable) which gives the Coupe its overall higher gearing.

    The Q4 and Coupe 16vt are quoted as the same top gear ratio of 0.92, however the final drive for the Q4 is quoted as 3.35, the Coupe 16vt 3.11 .

    So it looks like the longer legs of the Coupe are all down to the final drive.

    If anyone can confirm these new (expensive) gears work fine then I'll take a look at getting them in the shop.

    Cheers
    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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    Well i canceled mu order because the one gear is not available by fiat in my country and they told me that it is posible to have it maybe in 5-10 months. I will take out The oem and i will go to someone in my place that is made racing gear boxes and gears and i will ask him if he can make the same gears with 30/37. I will inform you here when i have some news

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    Default Longer 5th gear - Q4 gearbox

    Has anyone done the sums to work out what the mph/1000rpm would be with the 30/37 gearset?
    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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    maybe will help: I found that 155 2.5 TD, some versions of delta II 16vT, tempra and dedra 4x4, not all models, just some rare versions have this gear 30/37 gearset

    Vedran

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    Quote Originally Posted by Steve Webb View Post
    Has anyone done the sums to work out what the mph/1000rpm would be with the 30/37 gearset?

    with standard gearset (33/36) gear ratio is 1 : 0.917 runs 35.418kmh/1000rpm (230.2kmh/6500rpm)

    with 30/37 gear set gear ratio is 1 : 0.81 runs 40.108 kmh/1000rpm if i calculated correctly
    (260kmh/6500rpm)

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    I just informed from Enrico that they produce these gears ( as he already have it in hi car) for 450 euro.....

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    Hmmm, not a cheap solution then.
    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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    Expensive enough. If i have time i will visit someone in next city who is building racing gearboxes. The only i am bored to do is to take out the stock gears to show them as a sample

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    i have found whole gearbox from 155 2.5 TD for 100 €

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    You are lucky if the the 5th gear is in good condition buy it

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    There are quite a few 155 2.5 tds over here in France, I'll keep my eyes open to see if any are being broken for parts.
    Mind you It looks like you can get a complete car for @€400

    If only I had the space to store one.
    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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    i have asked guy who sell this gearbox to check number of teeth from 5th gear to be sure it's 37/30 gearset. i'm waiting him to check. i hope it's correct gear set, and in good condition

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    The other day I bought 155 2.5 TD complete gearbox for 80 euros,it has 30/37 gearset, so today I have replaced gear and I can confirm it fit perfectly. some pics:
    Attached Images Attached Images

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    Isn't this the same gearbox that is in the 164 2.5td as well?

    If so here is one for sale in France for €100

    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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    well, what can I see in pictures it's not same from outside, 155 have different mounting and shifting, but it may be same inside...

    according to EPER, it has 31/43 gearset! too long I think. it will be too big diference between 4th and 5th gear
    Last edited by abarth 22; 15-12-12 at 21:37.

  25. #25
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    which gear set is 31/43? you mean from 164 2.5 TD?

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