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  1. #26
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    Quote Originally Posted by abarth 22 View Post
    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:
    great info, i have on local ebay here about 6 of this gearboxes, from 75-150EUR each.. so probably i will buy one and ask seller to take this gears out and send to me, and he can trash everything else


    regards

    WS
    "Never take life seriously. Nobody gets out alive anyway."

  2. #27
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    Quote Originally Posted by Suzumushi View Post
    great info, i have on local ebay here about 6 of this gearboxes, from 75-150EUR each.. so probably i will buy one and ask seller to take this gears out and send to me, and he can trash everything else


    regards

    WS
    Could you send me a link please. I am interested too or if it is possible pm me for sending you money to buy a pair for me too. Thank you in advance

  3. #28
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    Quote Originally Posted by mpampis_ View Post
    Could you send me a link please. I am interested too or if it is possible pm me for sending you money to buy a pair for me too. Thank you in advance
    You have a PM
    regards

    w
    "Never take life seriously. Nobody gets out alive anyway."

  4. #29
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    Be interested to see what the mph/1000rpm of the car was after fitting these gears. Be sure to make motorway cruising a lot more comfortable.
    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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    Actually i was thinking a 0.71 ratio in 5th gear but for now i'm sure it will be great. I hope we could buy these gearboxes

  6. #31
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    I have not read the whole thread but the Fiat Coupe has a 3.1 final drive vs the 3.3 in the Q4. If you wanted a slightly longer set of gears, use the Coupe FD! I would rather have shorter gears. 3.3 or 3.5 even. Its illegal to go faster than 110km/hr on the freeway in Aus.

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    Quote Originally Posted by SteveNZ View Post
    I have not read the whole thread but the Fiat Coupe has a 3.1 final drive vs the 3.3 in the Q4. If you wanted a slightly longer set of gears, use the Coupe FD! I would rather have shorter gears. 3.3 or 3.5 even. Its illegal to go faster than 110km/hr on the freeway in Aus.
    if you want all gear longer like coupe, you need to open whole gearbox and replace final ratio gear on diff, I think it will not fit from coupe becouse coupe is FWD, but you can use it from dedra integrale or deltas, but not EVO models

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    You also can use the Dedra Box, it fits with no modifications and it has the same 3.1 final drive like Fiat Coupe.
    Only problem is the torque distribution of 56% front / 47% rear.
    You additionally could change the old dedra main diff. to the main diff from 16V Delta Integrale (my solution, fits without changes as well).
    Then you have a 3.1 final drive and the torque distribution of 47% front / 53% rear.
    I think the 30/37 gearset is too long, you then would have a very very big gap between 4th and 5th gear?! That's not nice as well!
    Much more interesting is Bacciromano solution, 29/25 ratio = 0.862
    Then the gap is not as high, it is more driveable...
    Juergen

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    Quote Originally Posted by Stichl View Post
    You also can use the Dedra Box, it fits with no modifications and it has the same 3.1 final drive like Fiat Coupe.
    Only problem is the torque distribution of 56% front / 47% rear.
    You additionally could change the old dedra main diff. to the main diff from 16V Delta Integrale (my solution, fits without changes as well).
    Then you have a 3.1 final drive and the torque distribution of 47% front / 53% rear.
    I think the 30/37 gearset is too long, you then would have a very very big gap between 4th and 5th gear?! That's not nice as well!
    Much more interesting is Bacciromano solution, 29/25 ratio = 0.862
    Then the gap is not as high, it is more driveable...
    Juergen
    I'm also afraid about gap bethween 45h and 5th gear, but I will see when I finish car...

  10. #35
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    It is all matter of torgue. For a completely stock car 0.81 is to long when change from 4 to 5 gear but if you have a modified engine with a lot of torgue it would be much better specially in trips

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    Quote Originally Posted by mpampis_ View Post
    It is all matter of torgue. For a completely stock car 0.81 is to long when change from 4 to 5 gear but if you have a modified engine with a lot of torgue it would be much better specially in trips
    I planning around 260-300 HP so I think it will be good,time will show...

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    Default Longer 5th gear - Q4 gearbox

    Two sets of 30/37 gears, scraped from TD gearboxes

    will have to mount one set to my gearbox in the near future.

    Thanks, for the tips.

    W
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    "Never take life seriously. Nobody gets out alive anyway."

  13. #38
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    Yeaaaaaa!!!!!

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    So its possible to make a longer 5th gear using the gearset from the 2.5td gearbox, but is it possible to make a shorter gearbox using the gears from another Alfa gearbox? Say the gearbox from the 155 1.7.
    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 don't know if these gears can fit to the gear axcel! 2.5TD and our Q4 gearboxe are available to handle "high torgue" and they are enhanced so i am not sure if the gears from a smaller gearbox can fit to our thick gear axcel

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    what about the other gears in the TD box - are they the same as the ones in the Q 4 box?

    maybe it is possible to make an close ration box using the 2 boxes?

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    I guess even all gears can fit, it would be a longer ratio. The only i don't know is the ratio of the differental (crown and pinion)

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    no good then - need a shorter ratio

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    gears from 2.5 TD are same like in Q4 except longer diff and longer 5th gear.
    some diff ratios:

    -2,947 delta HF 8vT 4WD
    -3,111 coupe 16vT, dedra 8vT 4WD, all delta, delta II HF
    -3,176 dedra 8vt FWD
    -3,353 Q4
    -3,562 delta II HF HPE 98-99', tempra 4WD
    -3,93 dedra II S.W. 16v AT 4WD 94-99'

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    Default Longer 5th gear - Q4 gearbox

    Created to give the longer 5th gear modification its own thread.
    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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    Quote Originally Posted by abarth 22 View Post
    gears from 2.5 TD are same like in Q4 except longer diff and longer 5th gear.
    some diff ratios:

    -2,947 delta HF 8vT 4WD
    -3,111 coupe 16vT, dedra 8vT 4WD, all delta, delta II HF
    -3,176 dedra 8vt FWD
    -3,353 Q4
    -3,562 delta II HF HPE 98-99', tempra 4WD
    -3,93 dedra II S.W. 16v AT 4WD 94-99'
    I am not a mecanic - but a psykologist
    does that mean that the dedra gears from the 4WD will fit and give me shorter rations?

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    Quote Originally Posted by peter holst View Post
    I am not a mecanic - but a psykologist
    does that mean that the dedra gears from the 4WD will fit and give me shorter rations?
    I'm not sure about that diff ratios, I've find that on: www.automobile-catalog.com/
    seems to me like big diference between dedra and other cars ratio

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    Looking forward to hearing the results of this. Ive now driven the car enough to get annoyed with its low cruising speed again.

    Unfortunately there are probably more Q4's than turbo diesels in the UK. Finding a 2.5 gearbox will be fun to say the least!

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    Quote Originally Posted by SteveNZ View Post
    I have not read the whole thread but the Fiat Coupe has a 3.1 final drive vs the 3.3 in the Q4. If you wanted a slightly longer set of gears, use the Coupe FD! I would rather have shorter gears. 3.3 or 3.5 even. Its illegal to go faster than 110km/hr on the freeway in Aus.
    Me too . I have been trying to explain Enrico (scara73.it) what i want but not good enough
    Can any one tell me what parts i need to have shorter gears (3,4,5)?

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    Enrico has already in his product a shorter ratio. Crown and pinion for making all gears shorter
    http://scara73.it/motore/motor14.html
    Look at the second picture

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