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Jerry, does the late cooper S G285 have a taller or shorter final drive than the SVT? I’d be interested in getting tighter gearing for around town if I can just go pull a few gears out of a trashed mini.
 

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Here are the different ratios. For your purpose, look at the "early" Mini gears, the switch came in July of 2004. The SVT should have the early (slightly taller) gearing. I started with the later ratios, which are a little stiffer:


|Mini Cooper S ratios |**** |
+---+-----------+-----------+
| 1 |** 11.425* |** 12.789* |
| 2 |*** 7.181* |*** 7.793* |
| 3 |*** 5.397* |*** 5.651* |
| 4 |*** 4.407* |*** 4.615* |
| 5 |*** 3.656* |*** 3.828* |
| 6 |*** 2.986* |*** 3.126* |
| R |** 11.130* |** 11.944* |
+---+-----------+-----------+
*** | > 06/2004 | 07/2004 > |
*** +-----------+-----------+

MINI Diesel:
+---+-----------+
| G |********** |
| e |* Overall* |
| a |** Ratio** |
| r |********** |
+---+-----------+
| 1 |** 12.570* |
| 2 |*** 6.990* |
| 3 |*** 4.510* |
| 4 |*** 3.550* |
| 5 |*** 3.050* |
| 6 |*** 2.410* |
| R |** 11.130* |
+---+-----------+

I don't know what the individual gears and rear ends are. As you know 3rd and 5th are the same gear as is 4th and 6th. I can list speed in gears for both, but I don't have a chart, so it would be a little tough to show.

Just getting acclimated, but the ratios are working exactly as I thought. 1st is almost the same, but by the time I hit 3rd it is the same as old 4th. 4th is about the same as old 5th and new 5th is a little taller than old 6th. I go from about 23 mph/1000 rpm to 30 mph per 1000 rpm in 6th. The drop on the highway (where is matters, driving in town is just in 1 gear lower) is about 500 rpm. I will get a better feel as I put some miles on it.

Am I happy? Actually, yes. I know I was giving up torque multiplication, so when I have done this on other cars (just swap the diff and reprogram computer), I always added some mechanical power to offset the loss.

I think the engine will be more relaxed on the highway, improve mpg as a side benefit and adding back power to the motor will negate the taller gears. For the Mini, the 6 speed automatic has virtually the same top gear ratio as my new setup, so I know the motor can pull the gear, even stock. Only difference (with new cam setup) is the power has moved up the power band, so if I want to hustle, I need to spin about 3500, where she really pulls hard. 6th gear will be primarily highway, above 60 or 65 mph.

Regards,
Jerry
Hey Jerry,

I hope all is well and you are continuing to enjoy your new transmission setup. Could you report on if you have noticed any difference in MPG post swap?

Thanks!
 
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