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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > Differential Swap. Change Gearing.



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      12-06-2005, 02:08 AM   #23
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Quote:
Originally Posted by Compos Mentis
I had a fleeting thought to put in a longer gear, taking advantage of the wide torque band for 'normal' driving, with less shifting. I know, it's sacrilege, and I'd never do it. I do occasionally skip 2nd if I'm just getting up to a 30 mph speed limit.
Is this car really drag limited at the top end? I am just thinking that that the ratio is matched to the drag limit fairly closely.

Just talking here, please don't flame me too bad.
CM
You´ve got an xi. Changing (just the rear) diff will mess things up really bad. No matter if you choose shorter or longer, you´d have to change both diffs (front and rear). Hardly doable.
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      12-06-2005, 02:09 AM   #24
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Btw, what happened to the Blackberry King and this thread. No comeback?
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      12-06-2005, 02:16 AM   #25
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Quote:
Originally Posted by Robin Hood
It's a Drexler lsd (0-100% just like the M3 E46 etc)

Makes the car mor fun to drive. I'm thinking about buying it for my 330i next year.But it has some disadvantages in the connection to the DTC/DSC electronical units when they are normally switched on: The DTC/DSC interference is much faster/heavier than normal. So you have to drive always with those systems turned of or get used to power-loss when flooring it...
That´s exactly why LSD conversions are offered so seldom. It does mess up DSC / DTC big time, unless the DSC/DTC is adapted. Which it is on the M-cars but which hardly any aftermarket company can muster.

Just imagine the liability issues....

While switching off DSC/DTC for serious performance driving is fine, on a non-dedicated track car for daily use, I would allways want a fully operational (switchable for moments of fun) DSC. You cannot allways foresee what´s coming up and in certain situations DSC really can be a life saver.

So I guess i really need an M3
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      12-12-2005, 06:27 PM   #26
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My mom and i both picked up e90s about a month ago, Mine is a 6 speed 330i and hers is a 330Xi Automatic. I did a diff swap in my 330Ci and loved it. I am thinking about taking my moms car for the day and swapping My 3.15 into her car and taking her 3.64 and putting it to my car. I wonder how much slower her car would be with a 3.15... at lease she will get better gas mileage. Will this affect the X drive taking her diff or no? anyone?


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      12-13-2005, 02:15 AM   #27
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Quote:
Originally Posted by Artz 330
My mom and i both picked up e90s about a month ago, Mine is a 6 speed 330i and hers is a 330Xi Automatic. I did a diff swap in my 330Ci and loved it. I am thinking about taking my moms car for the day and swapping My 3.15 into her car and taking her 3.64 and putting it to my car. I wonder how much slower her car would be with a 3.15... at lease she will get better gas mileage. Will this affect the X drive taking her diff or no? anyone?


Thanks.~
That´s a good recipe for trouble

You can put her diff in your car allright.

But put yours in her car and all hell will brake loose. She´ll have a different final drive on the rear wheels than the front which means the central diff will be running unequal speeds at the two outputs, will wear like hell, the X-Drive electronics will be in "WTF-mode", the brakes will be applied by X-drive to slow down the "slipping" wheels etc.

In short, that´s one helluva expensive mod.

Besides, the diffs will probably not fit anyway. You might have to shorten drive shafts etc. to make them fit.
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      12-13-2005, 06:17 AM   #28
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Quote:
Originally Posted by Tierfreund
You´ve got an xi. Changing (just the rear) diff will mess things up really bad. No matter if you choose shorter or longer, you´d have to change both diffs (front and rear). Hardly doable.
Doh! You're absolutiely right. I wasn't seriously considering a change for my xi, but I was trying to rationalize any gear change. The power band is so wide, there may not be much gain to change the gearing anyways...for me that is. I guess if 1/4 mile times are what you're after, it makes sense. Who would do that to a E90 though?
Now that I'm starting to get some miles on my xi, I'm getting more and more appreciation for how it is set up right now. Wow.
I'm still breaking in, so I'm not pushing too hard...yet.
Went out last night for some break in miles and found a great road. It's either me or the shifting is getting better.
It just keeps getting better...

CM
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      12-13-2005, 02:37 PM   #29
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lol, oh well shell be like damn i need to buy a new diff.. better her then me LMAO







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      12-13-2005, 10:49 PM   #30
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Quote:
Originally Posted by Artz 330
lol, oh well shell be like damn i need to buy a new diff.. better her then me LMAO







Jk~ Mom
"The son I wish I never have."
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      12-14-2005, 12:12 AM   #31
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I think the perfect combo would be a 2.93 diff with a Supercharger on the I6 pushing 320hp. 2nd gear would be a beast, like in the MINI 2nd gear 70 MPH
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      12-15-2005, 01:04 PM   #32
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Wow this is a very interesting post. We got some high rollers going back and forth. Still, I find myself confused with all this numbers and formula getting tossed around. Maybe I should just stick with my stock setup. But very interesting to see what people have done or consider doing to their $37K-$44K cars. I am still paying off the car notes.
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      09-25-2011, 08:46 PM   #33
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Back from the dead. Where can i get a 3.6 differential and what car is it out of? (325 auto maybe?)
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      09-25-2011, 10:32 PM   #34
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Quote:
Originally Posted by Tierfreund View Post
That´s exactly why LSD conversions are offered so seldom. It does mess up DSC / DTC big time, unless the DSC/DTC is adapted. Which it is on the M-cars but which hardly any aftermarket company can muster.

Just imagine the liability issues....

While switching off DSC/DTC for serious performance driving is fine, on a non-dedicated track car for daily use, I would allways want a fully operational (switchable for moments of fun) DSC. You cannot allways foresee what´s coming up and in certain situations DSC really can be a life saver.

So I guess i really need an M3
an LSD doesn't affect DTC or DSC... the parts are internal that lock up when needed... the Traction Control features are an electronic command to put power to whatever wheel it needs.

On the other hand, putting a NO SLIP differential WILL affect traction control... the computer can't tell a wheel to move independently...

info courtesy of TurnerMotorSports when i asked them about the OS Giken 3.64:1 LSRD (the one they sell is for M3, but they can special order one for other models)

OS Giken Super Lock (adjustable differential) for E90 N52 based engines
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      09-27-2011, 06:45 AM   #35
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Back from the dead. Where can i get a 3.6 differential and what car is it out of? (325 auto maybe?)
www.performancegearing.com
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      09-27-2011, 07:00 AM   #36
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Why not hit up Dan at www.diffsonline.com IMO the most knowlegeable shop when it comes to BMW drivetrain.

He does nothing but custom gearing and LSDs for BMWs.
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      09-27-2011, 08:49 AM   #37
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Damn 05!? I was a junior in HS, hahahahahha
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      09-27-2011, 09:55 AM   #38
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Looks like a 1series diff will fit the e90. Can anyone confirm?
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      05-16-2013, 07:27 AM   #39
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Massive thread revival!
Will the computer recognize its running a different gear ratio after swaping the differential with say, a higher gear ratio? Or, does the car need to be coded?
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      05-16-2013, 11:04 AM   #40
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Quote:
Originally Posted by cuco View Post
Will the computer recognize its running a different gear ratio after swaping the differential with say, a higher gear ratio? Or, does the car need to be coded?
When I swapped my diff for diff with 3.46 ratio my BC was showing to shift up when I was in sixth gear. After a while it adopted itself and it doesn’t do it anymore.
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      05-19-2013, 05:57 PM   #41
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If you have a MT car it will not care.
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      05-19-2013, 07:26 PM   #42
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If you have a MT car it will not care.
Mine has the 6AT.
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