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Old 07-13-2011, 12:22 AM   #1
titan320ci
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Join Date: Apr 2011
Location: london, UK
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My Ride: 2001 320ci auto
Diff Blew Up!

Hi guys, so i have been a little too enthusiastic with the steptronic recently when i had a custom s/s back box added, and destroyed my diff! i have managed to get a good replacement 3.23, the original was 3.38. i've trawled through all the threads, but want to know will the acceleration loss be very noticeable? the 320 2.2 motor is only 170hp

BTW, taken advice form you guys and having the front dropped 55mm and the rear 30mm!!
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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Old 07-13-2011, 12:28 AM   #2
bwallace530
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How did you blow the diff up?
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Old 07-13-2011, 12:28 AM   #3
mkodama
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The different diff will probably be noticeable. On the positive side you might get slightly better mileage when cruising on the freeway over long distances. The bad thing is I doubt you do much freeway cruising if you live in London.
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Old 07-13-2011, 12:31 AM   #4
titan320ci
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I was just racing around like a lunatic, and the car started to make a nasty noise and judder each wheel revolution. So i stopped and called the auto club, and had the worst confirmed. thank god, i found a good replacement part on ebay for 175.00. I think the diff must have not been in the best condition anyway, but i sealed its fate by ripping the sh*t out of it!
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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Old 07-13-2011, 12:34 AM   #5
titan320ci
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Quote:
Originally Posted by mkodama View Post
The different diff will probably be noticeable. On the positive side you might get slightly better mileage when cruising on the freeway over long distances. The bad thing is I doubt you do much freeway cruising if you live in London.
LOL! worst fears confirmed! Having said that, i am looking for a garage to swap my mother's 325i motor with my 320ci, and then supercharge!
but this is when funds allow
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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Old 07-13-2011, 01:09 AM   #6
Rob43
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The 3.23 Diff is a 4.5% loss, you'll feel it a little.

Question: what tire size do you run front & rear ?
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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
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Old 07-13-2011, 01:16 AM   #7
titan320ci
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Quote:
Originally Posted by Rob43 View Post
The 3.23 Diff is a 4.5% loss, you'll feel it a little.

Question: what tire size do you run front & rear ?
I guess i'll have to take the hit, its not that bad i guess. tyre size is standard actually, maybe i can get the car chipped until i engine swap and s/charged.
thanks for the calculations though!
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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Old 07-13-2011, 08:45 AM   #8
Jim Murphy
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Did you ever change the diff lube per the "good" maintenance schedule?

Jim
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Old 07-13-2011, 09:00 AM   #9
RockLee
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Well at least you will have a higher top speed. That you will probably never reach. lol
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Old 07-13-2011, 09:05 AM   #10
Lemonsqr
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wow, I thought diffs on a stock car would be bullet proof on the E46......
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Old 07-13-2011, 11:03 PM   #11
titan320ci
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Originally Posted by Lemonsqr View Post
wow, I thought diffs on a stock car would be bullet proof on the E46......
It turns out that the diff I ordered will only easily fit a 325ti model, so have returned the diff and paid an additional 70 for a 3.38 item. so there will be no acceleration loss after all, but another 48 hours wasted!
i've only had the car since april, so can't say for sure if the diff lube was ever changed or looked after, but this is something i will be rigorous with myself now. but so far including the springs being changed at the sametime (could have done myself really) this episode is costing nearly 500!. but hey, these cars are worth spending on
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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Old 07-13-2011, 11:09 PM   #12
bwallace530
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Originally Posted by titan320ci View Post
It turns out that the diff I ordered will only easily fit a 325ti model, so have returned the diff and paid an additional 70 for a 3.38 item. so there will be no acceleration loss after all, but another 48 hours wasted!
i've only had the car since april, so can't say for sure if the diff lube was ever changed or looked after, but this is something i will be rigorous with myself now. but so far including the springs being changed at the sametime (could have done myself really) this episode is costing nearly 500!. but hey, these cars are worth spending on
Where did you order from?


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Old 07-14-2011, 12:57 AM   #13
titan320ci
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Originally Posted by bwallace530 View Post
Where did you order from?


Sent from my PC36100 using Bimmer App
ebay bmw parts specialist based in manchester, excellent service!
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TITAN SILVER 2001 E46 320CI
XENONS,
REAR LEDs
RED SPORT LEATHER
PEWTER DI NOC TRIM
ALPINA B3 FRONT AND REAR SPOILERS
ALPINA GOLD STRIPES
ALPINA 18" Classics
55mm front and 30mm drop
custom s/s exhaust
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