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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #1  
Old 01-03-2013, 06:12 PM
JackDuggan JackDuggan is offline
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Location: Fredericksburg, VA
 
Join Date: Dec 2012
Posts: 65
Mein Auto: 2001 Z3 3.0 Roadster
S204A option code "shorter final drive ratio"

I did a VIN decode on my 2001 3.0, w/5sp manual and found an optional axle code of S204A. Does anyone know what that ratio is? I've looked around on the web and can't find a definite answer. I think it might be a 3.15, with stock being 3.07. Anyone know for sure?
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  #2  
Old 11-04-2014, 09:41 AM
big_cg big_cg is offline
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Location: IA
 
Join Date: Jan 2014
Posts: 31
Mein Auto: 335i
Anyone find an answer to this? What rpm on the highway will this ratio hold?
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  #3  
Old 11-04-2014, 11:00 AM
JackDuggan JackDuggan is offline
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Location: Fredericksburg, VA
 
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Posts: 65
Mein Auto: 2001 Z3 3.0 Roadster
I never found out.
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  #4  
Old 02-01-2015, 02:53 PM
cpallenjr cpallenjr is offline
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Location: Seattle, WA USA
 
Join Date: Jan 2015
Posts: 3
Mein Auto: 2002 Z3 2.5
Z3 Final Drive Ratios

I know that this is kind of old post, but I was wondering the same thing and finally found the answer! Sharing here for good karma.

This example is for a 2001 Z3 3.0i with M54 engine.

BMW Archive - VIN Lookup: Go here to get the details on you car's factory build
http://www.bmwarchive.org/vin/bmw-vin-decoder.html

BMW Parts Site
http://www.bmw.com/com/en/owners/acc...catalogue.html
Log in info can be found elsewhere on this site, or ask you dealer.

Drill down in parts to Rear Axle/Rear Axle Drive:
http://www.etk*****bmw/EN/search/sel...CE/33/33_0385/
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  #5  
Old 02-01-2015, 03:17 PM
cpallenjr cpallenjr is offline
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Location: Seattle, WA USA
 
Join Date: Jan 2015
Posts: 3
Mein Auto: 2002 Z3 2.5
Z3 Final Drive Ratios (continued)

The LSD option is shown as a separate bolt on unit that presumably then doesn't affect the final drive ratio, although there are different numbers for each combination:

http://www.etk*****bmw/EN/search/sel...CE/33/33_1075/

The information you have been waiting for:
http://www.etk*****bmw/EN/search/sel...CE/33/33_0385/

***8470; Description
1 Exchange final drive with differential I=3,07 33 10 7 508 264


For vehicles with
Automatic transmission(S205AYes)

***8470; Description
1 Exchange final drive with differential I=3,15 33 10 7 508 266


For vehicles with
Shorter final drive ratio(S204AYes)
and
Automatic transmission(S205AYes)

***8470; Description
1 Exchange final drive with differential I=3,46 33 10 7 508 262
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  #6  
Old 02-01-2015, 03:21 PM
cpallenjr cpallenjr is offline
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Location: Seattle, WA USA
 
Join Date: Jan 2015
Posts: 3
Mein Auto: 2002 Z3 2.5
Z3-3.0L Final Drive Ratio Summary

So to summarize:

Standard Transmission: 3.07:1

Automatic Transmission: 3.15:1

Automatic Trans w/ Shorter Drive Ratio: 3.46:1
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