gearbox upgrades

[Mickb]

looking to upgrade sport gearbox, other than the lsd what else.

tuning the dci lump, till time/money is free'd up to get super charger:dapprove:

help please.

 

[ben_r1]

I dont understand.

You have a diesel clio and plan to fit a 172 box?

 

[Mickb]

yes. fact is that sport box is better..... plus doing it now says doing it at the conversion.

so whtas there to understand. im asking about what all i can change that would be worth while. other than lsd

 

[ben_r1]

ClioSports dont have a limited slip diff as standard.

Other than that the ratios will be wrong for your engine, it'll still have to played round with come conversion time and im sure you need a new subframe for either the RS block or box...

Wouldnt bother mate, save it for the conversion.

 

[Mickb]

im changing to a lsd.

front subframe getting changed this week for the wide track, plus boxes are the same just different insides.

all im asking for is what can be done to improve it

 

[480bhp.com]

Change the ratios, if your fitting a 1*2 box, or you'll struggle to hit 100mph and you'll never be off the clutch pedal.

1*2 box gives roughly 20mph per 1000rpm

In a diesel that would be pretty poor.

Other than an lsd, that's it, as the other option is close ratio gears.

This would lower the top speed even more and add even more frequent gear changes.

Chris

 

[Brett]

Change the ratios, if your fitting a 1*2 box, or you'll struggle to hit 100mph and you'll never be off the clutch pedal.

1*2 box gives roughly 20mph per 1000rpm

In a diesel that would be pretty poor.

Other than an lsd, that's it, as the other option is close ratio gears.

This would lower the top speed even more and add even more frequent gear changes.

Chris

+1 70mph is just over 3k where as 3K on the dci box is over 80mph closer to 90 iirc.

 

[mx1_champ]

diesel and petrol gear box's are very different , diesels have longer gear ratio's ans they have more torque to pull through the gear .
were as petrols have shorter ratio's but rev higher to make up for it
depending on what the purpose of the car was you could use your dci box to attain i higher top end speed with a 1*2 engine fitted .

 

[Martin_172]

lol at all the people saying dont fit a 172 box to a dci when a dci80 comes with a jc5 172 box as standard......

 

[Russ_16v]

as long as its in good nick, id chuck an lsd in it job done, as long as you look after the box it will last

 

[Andrew Cooke]

lol at all the people saying dont fit a 172 box to a dci when a dci80 comes with a jc5 172 box as standard......

not a JC5-128 then?

 

[Mickb]

least 1 person answered my question ta

 

[Andrew Cooke]

AFAIK

DCI80 uses a JC5-128 box has ratios around:
3.73/2.04/1.32/0.97/0.76 final drive 3.29

172 with a JC5-129 box has ratios:
3.08/1.86/1.32/1.03/0.8 final drive 4.07

Advertised rpm at 100mph
172 = 4,800
DCI80 = 3,700

 

[Martin_172]

mick dont know if you got a proper shot in my old 65 with it running full power but its running a JC5 129 172 box and its fine!