"Never take life seriously. Nobody gets out alive anyway."
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
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
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.
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
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
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
"Never take life seriously. Nobody gets out alive anyway."
Yeaaaaaa!!!!!
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
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
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?
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)
no good then - need a shorter ratio
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'
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
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
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!
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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