LSD in front differential

Twin_Turbo_S54 · 12-30-2012, 04:44 AM

can we install LSD into XI front diff?

Kubica · 12-30-2012, 01:43 PM

Better off trying to make the TC into limited slip. I've been told it's possibe to put an LSD up front, however. I was also told it would cause more understeer. Modifying the TC is probably a better option. You could most likely make an e90 TC fit, but wiring that unit up to an e46 is way above my pay grade. Something I'm interested in though since it wouldn't change the class I run it at autox.

redbull 325is · 01-01-2013, 09:01 PM

Quote:

Originally Posted by Kubica

Better off trying to make the TC into limited slip. I've been told it's possibe to put an LSD up front, however. I was also told it would cause more understeer. Modifying the TC is probably a better option. You could most likely make an e90 TC fit, but wiring that unit up to an e46 is way above my pay grade. Something I'm interested in though since it wouldn't change the class I run it at autox.

I wonder if the e90 xdrive transfer cases bolt up or even fit under our cars

bikesandcars · 01-02-2013, 08:04 AM

Can we? I tried a google search and didn't get any hits. If the front is the same as the rear you could probably find a LSD to fit. If not I doubt it as I didn't get any returns for that part.

Should we? Probably not. In the offroad world people don't usually run a LSD on the front differential in a street vehicle due to the understeer it creates and the handling issues that insue when fighting the rear wheels while turning. Many guys will install a manual locking differential up front so they can use it if they are stuck but leave it open during normal use... which begs another question

Which one would you use? There are basically 3 types (not counting spool/welding spider gears). Gear driven, Clutch/Plate type, or manual locking. Gear driven LS differentials (like Eaton's) seem much more popular in the import scene (not sure why over clutch / plate type), my guess is because they might work better with front wheel drive vehicles. If you can find one for the back and a back one fits the front you might be in luck. clutch would not be highly recommended I feel because it always provides some lockup and slips under load (vs the gear type that only provides lock under slipping torque). manually Locking would be best but I'm sure that's not available, never seen one for any imports

And why again? Why would you need this in a BMW, that is what the traction control system is for. In the winter it doesn't matter if your car uses the brakes to enhance traction. Just use the stock system IMO.

12-30-2012, 04:44 AM	#1
Twin_Turbo_S54 Registered User Join Date: Nov 2012 Location: Istanbul Posts: 295 My Ride: M3 View My Garage	LSD in front differential can we install LSD into XI front diff? __________________ 8 seconds 1/4 mile & sub 3 seconds 60-130 mph AWD M3X coming soon 4,23 s 60-130 mph E46 M3 TT 4,49 s 60-130 mph E36 M3 TT, 3,49 s coming soon RWD mode 8,45 s 60-130 mph 997 Turbo

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12-30-2012, 01:43 PM	#2
Kubica Registered User Join Date: Apr 2008 Location: Boston Posts: 3,907 My Ride: 2003 325xi View My Garage	Better off trying to make the TC into limited slip. I've been told it's possibe to put an LSD up front, however. I was also told it would cause more understeer. Modifying the TC is probably a better option. You could most likely make an e90 TC fit, but wiring that unit up to an e46 is way above my pay grade. Something I'm interested in though since it wouldn't change the class I run it at autox.

01-02-2013, 08:04 AM	#4
bikesandcars Registered User Join Date: Oct 2012 Location: Allentown, PA Posts: 98 My Ride: 2002 325xi-sport pkg View My Garage	Can we? I tried a google search and didn't get any hits. If the front is the same as the rear you could probably find a LSD to fit. If not I doubt it as I didn't get any returns for that part. Should we? Probably not. In the offroad world people don't usually run a LSD on the front differential in a street vehicle due to the understeer it creates and the handling issues that insue when fighting the rear wheels while turning. Many guys will install a manual locking differential up front so they can use it if they are stuck but leave it open during normal use... which begs another question Which one would you use? There are basically 3 types (not counting spool/welding spider gears). Gear driven, Clutch/Plate type, or manual locking. Gear driven LS differentials (like Eaton's) seem much more popular in the import scene (not sure why over clutch / plate type), my guess is because they might work better with front wheel drive vehicles. If you can find one for the back and a back one fits the front you might be in luck. clutch would not be highly recommended I feel because it always provides some lockup and slips under load (vs the gear type that only provides lock under slipping torque). manually Locking would be best but I'm sure that's not available, never seen one for any imports And why again? Why would you need this in a BMW, that is what the traction control system is for. In the winter it doesn't matter if your car uses the brakes to enhance traction. Just use the stock system IMO.