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Discussion Starter · #1 · (Edited)
The Mini Cooper S and SVT Focus apparently have the same gearbox, just a different casing. Might be interesting to get a set of Mini Cooper S gears and put those in our tranny. See the gear ratios below. Can you say RETROFIT!

Is anyone familiar with gear/speed calculations? What would the MPH be at the rev limiter (lets say shift at 7100 rpm) at each ratio so that we can compare the 2 cars?


http://www.sportcompactcarweb.com/ro...ooper_s_works/
Gear Ratios (Overall, including final drive)
1: 11.425:1
2: 7.181:1
3: 5.397:1
4: 4.407:1
5: 3.656:1
6: 2.986:1
Differential: Open

http://www.sportcompactcarweb.com/ro...vt_ford_focus/
Gear Ratios
1 : 12.7872:1
2 : 7.6896:1
3 : 5.6525:1
4 : 4.2925:1
5 : 3.8304:1
6 : 3.1104:1
Differential : Open

Just add in a quaife. should be fun.

Just curious to see how this might help out in racing, be it drag or open course.
 
G

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Discussion Starter · #3 ·
mmm... maybe I am missing something here?
I thought that higher gearing would yield better results. I guess I'd need to see what the gears would do to the MPH for each gear.
 
G

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Discussion Starter · #5 ·
DOH... i found a mini and a svt tranny on ebay, was thinking about buying both if this would have given us some help.

So comparably, what would the final speed be in 1st gear between these with our stock size tires?
 

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The Librarian
Joined
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13,116 Posts
SVTF is right around 45mph in 1st gear with stock tires.

Unfortunately, you don't show both final drives for either car in that table.
We have 2, not just one.
And the SVTF has lower final drives than the Mini.
Sport Compact also got 4th wrong...

Here's the SVTF gears from the Tech Data Brochure:
(also found at the bottom of this page...>>>http://www.myfordfocus.com/svt)
Gear...Ratio.....Diff Ratio...Overall Ratio
1........4.44:1...2.88:1.......12.7:1
2........2.67:1...2.88:1.......7.7:1
3........1.33:1...4.25:1.......5.7:1
4........1.08:1...4.25:1.......4.6:1
5........1.33:1...2.88:1.......3.8:1
6........1.08:1...2.88:1.......3.1:1

Here's a site where you can graph your speed.
Hint: Use 1.00 for the differential gear ratio, and the overall ratios for the transmission gears.
http://www.geocities.com/z_design_studio/transmission_z28_6.html

The Mini guys don't want our trannies for the individual gears, they want them for the 2.88 and 4.25 final drives.[;)]
 
G

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Discussion Starter · #7 ·
Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.44:1...2.88:1.......12.7:1.............42
2........2.67:1...2.88:1.......7.7:1...............69
3........1.33:1...4.25:1.......5.7:1...............93
4........1.08:1...4.25:1.......4.6:1..............115
5........1.33:1...2.88:1.......3.8:1..............140
6........1.08:1...2.88:1.......3.1:1..............171

If we use the mini's individual gears....

Gear...Ratio.....Diff Ratio...Overall Ratio.....MPH
1........11.425:1...2.88:1.......32.9:1...........16
2........7.181:1...2.88:1.......20.7:1.............26
3........5.397:1...4.25:1.......22.9:1.............23
4........4.407:1...4.25:1.......18.7:1.............28
5........3.656:1...2.88:1.......10.5:1.............51
6........2.986:1...2.88:1.......8.6:1...............62

Definitely too short for the drags....
 

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The Librarian
Joined
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13,116 Posts
^^^LOL!!!
6 gears just to get to 60!
Yeah, that's not such a good idea.

Any further update on what the Mini's final drives (differential ratios) are?
 
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Discussion Starter · #9 · (Edited)
I'll keep looking. We might be able to find some interesting combos.

http://www.helix13.com/html/products/productview.php?p=1&h=m
They offer a different final drive gear, but no info on the site. I will call when I have a chance.


http://www.carfolio.com/specifications/models/car/?car=138677&automobile-MINI
Transmission........6M
Drive....................FWD
Top gear ratio.... 1.09
Final drive ratio.. 4.24

http://www.johncooper.co.uk/JohnCooperSite/motorsport/Challenge+2004+Archive/
GEARBOX
Six speed Geetrac manual. Final drive 2.74-1.

http://www.supercarsite.net/cooper_s.htm
Transmission
Gear Type Getrag 6 Speed Manual
Final Drive 2.74:1 (1st, 2nd, 5th, 6th) / 4.05:1 (3rd, 4th)
1st Gear Ratio 4.17:1
2nd Gear Ratio 2.62:1
3rd Gear Ratio 1.33:1
4th Gear Ratio 1.09:1
5th Gear Ratio 1.33:1
6th Gear Ratio 1.09:1

Seems to be a lot of misinformation out there.... Not sure exactly where people get these numbers.
 

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Turbo!!!!
Joined
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5,797 Posts
any way to post the mini with stock gears and with svt gears just curious about the results
 
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Discussion Starter · #11 · (Edited)
So lets compare the supercarsite.net ratios to our car since those seem the most logical.

SVTf (using our stock tiresize and 7250rpm)
Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.44:1...2.88:1.......12.7:1.............42
2........2.67:1...2.88:1.......7.7:1...............69
3........1.33:1...4.25:1.......5.7:1...............94
4........1.08:1...4.25:1.......4.6:1..............124
5........1.33:1...2.88:1.......3.8:1..............139
6........1.08:1...2.88:1.......3.1:1..............171

MinicooperS (using our stock tiresize and 7250rpm)
Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.17:1....2.74:1.........11.426...........46
2........2.62:1....2.74:1.........7.179.............74
3........1.33:1....4.05:1.........5.387.............99
4........1.09:1....4.05:1.........4.415............120
5........1.33:1....2.74:1.........3.644............146
6........1.09:1....2.74:1.........2.987............178

Now.... How about Mini Individual gears with SVTf final drive ratios
Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.17:1....2.88:1.........12.001...........44
2........2.62:1....2.88:1.........7.546.............70
3........1.33:1....4.25:1.........5.653.............94
4........1.09:1....4.25:1.........4.633............115
5........1.33:1....2.88:1.........3.830............139
6........1.09:1....2.88:1.........3.139............169

And SVTf individual gears with Mini final drive ratios.
Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.44:1...2.74:1.......12.166.............44
2........2.67:1...2.74:1.......7.316...............73
3........1.33:1...4.05:1.......5.387...............99
4........1.08:1...4.05:1.......4.374..............121
5........1.33:1...2.74:1.......3.644..............146
6........1.08:1...2.74:1.......2.959..............179
 

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Turbo!!!!
Joined
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5,797 Posts
acording to these numbers the mini s is faster than the focus SVT but the svt has a lower 0-60 time 7.8 compared to 8.1 (I think thats what I read i"ll double check those numbers)
 
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Discussion Starter · #15 · (Edited)
I think I found an optimal gearing, but would require some parts from the Mini Cooper S (MCS).

Gear...Ratio.....Diff Ratio...Overall Ratio---MPH
1........4.44:1...2.88:1.......12.7872.............42
2........2.62:1...2.88:1.......7.5456...............70
3........1.33:1...4.05:1.......5.3865...............99
4........1.09:1...4.05:1.......4.4145..............120
5........1.33:1...2.88:1.......3.8304..............139
6........1.08:1...2.88:1.......3.1104..............171

Changes would be: 3/4 Final Drive ratio, 2nd gear, and 4th gear from the Mini.

This should help in the drags, so that we don't need to shift to 4th towards the end of the run. We would be good up till 99mph in 3rd.

Supposedly the 6spd Mini Cooper Diesel has lower first drive ratio, which would definitely help. I'll try to find specs for that tranny.
 
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