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Discussion Starter #1 (Edited)
Let us find the speed at 3000rpm in all gears on both 1.9 5/6 speed and 2.4 5/6 speed JTD Cars.
Remember to write your car model and engine model.

Use this link to converte from km/h to mph :
Replace "100" with your own speed and press enter

Use this link to converte from mph to km/h :
Replace "62" with your own speed and press enter

Be aware speedo reading is not as precise as GPS readings
outcome can enduring with 5% or more, again depending on tire choice

Write it this way (Just for show) :
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Alfa 147 1.9 8v 120hp - 5 speed
Speed at 3000 rpm. (speedo / gps)
1. - 20km/h
2. - 40km/h
3. - 60km/h
4. - 80km/h
5. - 100km/h
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After this, we must find out which cars can use one of the other gearboxes.

Lets begin:
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@ tomfromtelford
147 1.9 jtdm 16v -225/40/18
@3000rpm (speedo !)

1 - 32.19km/h - 20mph
2 - 48.28km/h - 30mph
3 - 80.47km/h - 50mph
4 - 104.61km/h - 65mph
5 - 140.01km/h - 87 mph
6 - 177.02km/h - 110mph

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@ TribesMan
Calculated from gear ratios

147/156/GT 1.9 JTD 16V 6 speed - 17" 215/45 wheels
@3000:

1. - 26,2km/h
2. - 44,6km/h
3. - 73,3km/h
4. - 102,7km/h
5. - 130,7km/h
6. - 163,5km/h

147/156 1.9 JTD 8V 5 speed
@3000:

1. - 27,8km/h
2. - 47,2km/h
3. - 77,6km/h
4. - 108,7km/h
5. - 138,3km/h


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Calculated from gear ratios
@ TribesMan
159 1.9 JTD 6 speed:

1. - 26,6km/h
2. - 47,1km/h
3. - 78,1km/h
4. - 106,1km/h
5. - 136,7km/h
6. - 165,7km/h

159/Brera/Spider 2.4 JTD 6 speed:

1. - 26,3km/h
2. - 51,3km/h
3. - 79,2km/h
4. - 109,6km/h
5. - 138,5km/h
6. - 167,9km/h

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Calculated from gear ratios
@ TribesMan
MiTo 1.6 JTD 6 speed - 215/45/17: (looks like it has the same gearbox as 159 1.9... at least same ratios, but different tyres)

1. - 25,4km/h
2. - 44,9km/h
3. - 74,4km/h
4. - 101,0km/h
5. - 130,2km/h
6. - 157,7km/h

Mito 1.3 JTD 6 speed - 215/45/17 (same box as above, but different final drive):

1. - 22,4km/h
2. - 39,7km/h
3. - 65,7km/h
4. - 89,3km/h
5. - 115,1km/h
6. - 139,4km/h

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@ Cuore_Sportivo_155
156 2.4 JTD 10V 5 speed worn standard 205/55 R16
@3000rpm (gps)

1. - 30km/h
2. - 51km/h
3. - 82km/h
4. - 116km/h
5. - 148 km/h

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Calculated from gear ratios
@ TribesMan

156 2.4 JTD 10V 5 speed == 1.9 JTD 8V

1. - 27,8km/h
2. - 47,2km/h
3. - 77,6km/h
4. - 108,7km/h
5. - 138,3km/h

156 2.4 JTD 20V 6 speed (same gearbox (GM) as 159 2.4 20V, but different tyres 215/45/17):

1. - 25,4km/h
2. - 48,8km/h
3. - 75,4km/h
4. - 104,4km/h
5. - 131,9km/h
6. - 159,8km/h

----------------------------------------

Calculated from gear ratios
@ TribesMan

166 2.4 10V & 20V 6 speed (same gearbox as 156 1.9 16V, different tyres) 225/45/17:

1. - 26,5km/h
2. - 45,1km/h
3. - 74,1km/h
4. - 103,7km/h
5. - 132,0km/h
6. - 165,1km/h

166 2.4 "eco" 10V (same as above, only longer final drive)

1. - 29,7km/h
2. - 50,4km/h
3. - 82,9km/h
4. - 116,1km/h
5. - 147,8km/h
6. - 184,8km/h

----------------------------------------
 

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Calculated from gear ratios and on 17" 215/45 wheels...

147/156/GT 1.9 JTD 16V 6 speed @3000:

1. - 26,2km/h
2. - 44,6km/h
3. - 73,3km/h
4. - 102,7km/h
5. - 130,7km/h
6. - 163,5km/h

147/156 1.9 JTD 8V 5 speed @3000:

1. - 27,8km/h
2. - 47,2km/h
3. - 77,6km/h
4. - 108,7km/h
5. - 138,3km/h

I dont know the gear ratios for 2.4 engines... so I cant help you there...
 

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Discussion Starter #3 (Edited)
Calculated from gear ratios and on 17" 215/45 wheels...

147/156/GT 1.9 JTD 16V 6 speed @3000:

1. - 26,2km/h
2. - 44,6km/h
3. - 73,3km/h
4. - 102,7km/h
5. - 130,7km/h
6. - 163,5km/h

147/156 1.9 JTD 8V 5 speed @3000:

1. - 27,8km/h
2. - 47,2km/h
3. - 77,6km/h
4. - 108,7km/h
5. - 138,3km/h

I dont know the gear ratios for 2.4 engines... so I cant help you there...
Thank you, I updated my first post.
How about 159 ? does it use another box ?
 

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Yes 159 uses another box... 225/500/17:

159 1.9 JTD 6 speed:

1. - 26,6km/h
2. - 47,1km/h
3. - 78,1km/h
4. - 106,1km/h
5. - 136,7km/h
6. - 165,7km/h

159/Brera/Spider 2.4 JTD 6 speed:

1. - 26,3km/h
2. - 51,3km/h
3. - 79,2km/h
4. - 109,6km/h
5. - 138,5km/h
6. - 167,9km/h

MiTo 1.6 JTD 6 speed 215/45/17: (looks like it has the same gearbox as 159 1.9... at least same ratios, but different tyres)

1. - 25,4km/h
2. - 44,9km/h
3. - 74,4km/h
4. - 101,0km/h
5. - 130,2km/h
6. - 157,7km/h

Mito 1.3 JTD 6 speed 215/45/17 (same box as above, but different final drive):

1. - 22,4km/h
2. - 39,7km/h
3. - 65,7km/h
4. - 89,3km/h
5. - 115,1km/h
6. - 139,4km/h

156 2.4 JTD 10V 5 speed == 1.9 JTD 8V

1. - 27,8km/h
2. - 47,2km/h
3. - 77,6km/h
4. - 108,7km/h
5. - 138,3km/h

156 2.4 JTD 20V 6 speed (same gearbox (GM) as 159 2.4 20V, but different tyres 215/45/17):

1. - 25,4km/h
2. - 48,8km/h
3. - 75,4km/h
4. - 104,4km/h
5. - 131,9km/h
6. - 159,8km/h

166 2.4 10V & 20V 6 speed (same gearbox as 156 1.9 16V, different tyres) 225/45/17:

1. - 26,5km/h
2. - 45,1km/h
3. - 74,1km/h
4. - 103,7km/h
5. - 132,0km/h
6. - 165,1km/h

166 2.4 "eco" 10V (same as above, only longer final drive)

1. - 29,7km/h
2. - 50,4km/h
3. - 82,9km/h
4. - 116,1km/h
5. - 147,8km/h
6. - 184,8km/h

I think thats about it... there is no info about Q-tronic gearbox ratios online...
 

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Well the only gear ratios I could find for 156 2.4 JTD 10V were exactly the same as the ones on 1.9 JTD 8V engines... Maybe I got the wrong data. Can anyone provide gear ratios for 2.4 JTD 10V?
But I guess you might be right CS155, because with the torque the 2.4 can provide it would be quite stupid to use the same gear ratios as on 1.9 JTD...
 

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This what I get with 225/40/18 @3000rpm
147 1.9 jtdm 16v

1 - 20mph
2 - 30mph
3 - 50mph
4 - 65mph
5 - 87 mph
6 - 110mph

6 can do 130 @ 3800ish rpm
 

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Bump
 

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Discussion Starter #13
Thanks.
Yours number differs from TribesMan's calculation.
But you also run tires with 2.98 percent smaller rolling circumference than those who TribesMan calculated from.
But it makes only a tiny difference !



---------
@ TribesMan
Sure your math i right?
 

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Speedo, I also have a tunning box.
 

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So if you compare that to my calculations I guess it is quite right, because speedo lies at least 5%... and your tyres are a bit bigger...
 

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Can you please test 4rd gear ?

Then i'll update the chart with your numbers.
4rth gear 116 km/hr...

and on a related note: never found my speedo to be off more than 3 km/h (at least not under 200 km/h), unlike the one in my 155 and 145... the 155 UNDER read when speeds got over 150, the 145 over reads by about 8-10 km/h...
 
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