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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 01-15-2012, 03:04 PM   #1
TheRiddle
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Gearbox swap (5 to 6 sp) info

I dunno if someone already did this, i tried to search but didn't found anything useful..

maybe ther will be someone that will know this better that me..

the fact is this my gearbox is having problem with those spring for the leverage (i've 2cm of play in lateral movements),to change them i must drop down the entire gearbox and open it ($$$)..
i've a 2.8 engine but my car is a 323cic (with 3.23 diff)..
lots of fun but it seems that a gear is "missing"
i found a guy that has some 6sp g.boxes (from a 330ci,some from diesel models, plus an M3 e36 6sp)

they will be mine for cheap, cheaper than fixing mine and remain with a car that redline in 5th gear really too easily

the question is: which one do you suggest me to look for to keep more or less the same speed (more is welcome but not necessary) but distribuited on 6 sp?
i'm talking about ratio....


i already know that the driveshaft must be changed but that is the minor problem (clutch comes with the gearbox)

thanks mates
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Old 01-18-2012, 09:17 AM   #2
mrshelley
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If you are going to put a 6 speed in it (from a 330) then you'll need a flywheel, clutch assembly, complete shifter, rear mount, driveshaft and maybe a different input flange for the diff (depends on what your car has in it). I suggest looking at http://realoem.com/bmw/ which will give you a good idea of what you need. As for ratios, here's a handy chart:
http://www.bokchoys.com/differential/GearRatios.htm
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Old 01-18-2012, 11:13 AM   #3
lab rat
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The link does not include gearboxes from diesels, there is good chance they have taller gears. 330 would be ideal (I know it fits as I just finished this swap). The ratios are pretty much the same as 5 speed and you get a .85 overdrive. This will drop your cruising RPMs in top gear so you could use shorter final drive (like 3.46).
I would stay away from e36 and M3 stuff.
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Last edited by lab rat; 01-18-2012 at 11:16 AM.
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Old 01-19-2012, 12:45 PM   #4
TheRiddle
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Quote:
Originally Posted by lab rat View Post
The link does not include gearboxes from diesels, there is good chance they have taller gears. 330 would be ideal (I know it fits as I just finished this swap). The ratios are pretty much the same as 5 speed and you get a .85 overdrive. This will drop your cruising RPMs in top gear so you could use shorter final drive (like 3.46).
I would stay away from e36 and M3 stuff.
in fact diesel's might be the best ones (for ratios)
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Old 01-19-2012, 02:19 PM   #5
mrshelley
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Diesel Gear Ratios:
1 - 5.080
2 - 2.804
3 - 1.783
4 - 1.260
5 - 1.000
6 - 0.835
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Old 01-19-2012, 02:45 PM   #6
TheRiddle
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Quote:
Originally Posted by mrshelley View Post
Diesel Gear Ratios:
1 - 5.080
2 - 2.804
3 - 1.783
4 - 1.260
5 - 1.000
6 - 0.835
ooohhh that's cool !!!

from which model these come from? (even if for what i saw on bokchois 330ci has the same ratios of mine + a 6th)...
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Old 01-19-2012, 04:46 PM   #7
mrshelley
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from which model these come from?
Really?
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Old 01-20-2012, 06:48 AM   #8
TheRiddle
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Originally Posted by mrshelley View Post
Really?
...really..,
dunno you,but in europe there are 4 diesel engine for 3 series and 5 for 5 series..
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Old 12-02-2013, 01:25 PM   #9
TheRiddle
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up

the swap is temporary aborted, but that absurd play stills in....

anyone knows the story of the 2 springs into the gearbox for the "center position" of the leverage?
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Old 12-03-2013, 04:57 PM   #10
TerraPhantm
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Quote:
Originally Posted by mrshelley View Post
If you are going to put a 6 speed in it (from a 330) then you'll need a flywheel, clutch assembly, complete shifter, rear mount, driveshaft and maybe a different input flange for the diff (depends on what your car has in it). I suggest looking at http://realoem.com/bmw/ which will give you a good idea of what you need. As for ratios, here's a handy chart:
http://www.bokchoys.com/differential/GearRatios.htm
If he has the 4-bolt diff, I think he could use a 325 SMG driveshaft instead of the 330 6-speed driveshaft
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